1[/ 2 / Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com) 3 / 4 / Distributed under the Boost Software License, Version 1.0. (See accompanying 5 / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 /] 7 8[section:history Revision History] 9 10[heading Asio 1.18.0 / Boost 1.74] 11 12* Added an implementation of the proposed standard executors 13 ([@http://wg21.link/P0443r13 P0443r13], [@http://wg21.link/P1348r0 P1348r0], 14 and [@http://wg21.link/P1393r0 P1393r0]). 15* Added support for the proposed standard executors to Asio's I/O facilities: 16 * The `io_context::executor_type`, `thread_pool::executor_type`, 17 `system_executor`, and `strand` executors now meet the requirements for the 18 proposed standard executors. These classes also continue to meet the 19 existing requirements for the Networking TS model of executors. 20 * All I/O objects, asynchronous operations, and utilities including 21 `dispatch`, `post`, `defer`, `get_associated_executor`, `bind_executor`, 22 `make_work_guard`, `spawn`, `co_spawn`, `async_compose`, `use_future`, 23 etc., can interoperate with both new proposed standard executors, and with 24 existing Networking TS executors. The implementation determines at compile 25 time which model a particular executor meets; the proposed standard 26 executor model is used in preference if both are detected. 27 * The `any_io_executor` type alias has been introduced as the new default 28 runtime-polymorphic executor for all I/O objects. This type alias points to 29 the `execution::any_executor<>` template with a set of supportable 30 properties specified for use with I/O. This change may break existing code 31 that directly uses the old polymorphic wrapper, `executor`. If required for 32 backward compatibility, `BOOST_ASIO_USE_TS_EXECUTOR_AS_DEFAULT` can be 33 defined, which changes the `any_io_executor` type alias to instead point to 34 the `executor` polymorphic wrapper. 35 * Support for the existing Networking TS model of executors can be disabled 36 by defining `BOOST_ASIO_NO_TS_EXECUTORS`. 37* Added converting move construction and assignment to `basic_waitable_timer`. 38 This enables move construction and assignment between different timer 39 types, provided the executor types are convertible. For example:[br] 40 `` 41 basic_waitable_timer< 42 clock_type, 43 traits_type, 44 io_context::executor_type 45 > timer1(my_io_context); 46 47 basic_waitable_timer< 48 clock_type, 49 traits_type, 50 any_io_executor // polymorphic wrapper 51 > timer2(std::move(timer1)); 52 ``[br] 53* Enabled C++20 coroutine support when using [^gcc] 10. 54* Added overloads of `co_spawn` that launch an awaitable. This change allows us 55 to write:[br] 56 `` 57 co_spawn(executor, 58 echo(std::move(socket)), 59 detached); 60 ``[br] 61 instead of:[br] 62 `` 63 co_spawn(executor, 64 [socket = std::move(socket)]() mutable 65 { 66 return echo(std::move(socket)); 67 }, 68 detached); 69 ``[br] 70* Added a new constructor overload to `use_awaitable_t`'s default executor 71 adapter, to enable conversion between executor types. 72* Added support for using `detached_t` as a default completion token, by 73 adding members `as_default_on()` and `as_default_on_t<>`. 74* Added a move constructor to `ssl::stream<>`. 75* Changed `ssl::stream<>` write operations to linearise gather-write buffer 76 sequences. 77* Added compile-time detection of the deprecated `asio_handler_invoke` hook. 78 This hook was deprecated with the introduction of the Networking TS trait 79 `associated_executor` and function `get_associated_executor()`. Compiling 80 an application with `BOOST_ASIO_NO_DEPRECATED` will now trigger a compile 81 error if any handler implements the `asio_handler_invoke` hook. 82* Added compile-time detection of the deprecated `asio_handler_allocate` 83 and `asio_handle_deallocate` hooks. These hooks were deprecated with the 84 introduction of the Networking TS trait `associated_allocator` and function 85 `get_associated_allocator()`. Compiling an application with 86 `BOOST_ASIO_NO_DEPRECATED` will now trigger a compile error if any handler 87 implements the `asio_handler_allocate` or `asio_handler_deallocate` hooks. 88* Implemented a number of performance optimisations, including: 89 * Specialising single-buffer operations to use `recv` rather than `recvmsg`, 90 `send` rather than `sendmsg`, `read` rather than `readv`, and `write` 91 rather than `writev`. 92 * Lightening the reference counting overhead of the polymorphic wrapper 93 `executor`. 94 * Returning from system call operation wrappers as early as possible, and 95 only accessing `errno` and error codes when on an error path. 96 * Applying additional optimisations if a "native" I/O executor (such as 97 `io_context::exeutor_type`) is detected. 98* Added source location support to handler tracking. The new 99 `BOOST_ASIO_HANDLER_LOCATION((file_name, line, function_name))` macro may be used 100 to inform the handler tracking mechanism of a source location. This macro 101 declares an object that is placed on the stack. Then, when an asynchronous 102 operation is launched with location information, it outputs lines using the 103 [*<action>] [^n^m], prior to the [^n*m] line that signifies the beginning 104 of the asynchronous operation. For example: 105 `` 106 @asio|1589423304.861944|>7|ec=system:0,bytes_transferred=5 107 @asio|1589423304.861952|7^8|in 'async_write' (./../../../include/asio/impl/write.hpp:330) 108 @asio|1589423304.861952|7^8|called from 'do_write' (handler_tracking/async_tcp_echo_server.cpp:62) 109 @asio|1589423304.861952|7^8|called from 'operator()' (handler_tracking/async_tcp_echo_server.cpp:51) 110 @asio|1589423304.861952|7*8|socket@0x7ff61c008230.async_send 111 @asio|1589423304.861975|.8|non_blocking_send,ec=system:0,bytes_transferred=5 112 @asio|1589423304.861980|<7| 113 ``[br] 114 If `std::source_location` or `std::experimental::source_location` are 115 available, the `use_awaitable_t` token (when default-constructed or used as a 116 default completion token) will also cause handler tracking to output a source 117 location for each newly created asynchronous operation. A `use_awaitable_t` 118 object may also be explicitly constructed with location information. 119* Implemented various improvements to the [^handlerviz.pl] tool. 120 * Add nodes for pending handlers at bottom of graph, outlined in red. 121 * Display source location in a tooltip on the edge label (for SVG). 122 * Use invisible nodes to enforce order to keep related control flow vertical. 123* Added the [^handlerlive.pl] tool, which processes handler tracking output to 124 produce a list of "live" handlers. Live handlers are those that are 125 associated with pending asynchronous operations, as well as handlers that are 126 currently executing. For example: 127 `` 128 cat output.txt | perl handlerlive.pl 129 `` 130 or: 131 `` 132 perl handerlive.pl < output.txt 133 `` 134 or: 135 `` 136 perl handlerlive.pl output.txt 137 ``[br] 138* Added the [^handlertree.pl] tool, which filters handler tracking output to 139 include only those events in the tree that produced the nominated handlers. 140 For example, to filter the output to include only the events associated with 141 handlers `123`, `456`, and their predecessors: 142 `` 143 cat output.txt | perl handlertree.pl 123 456 144 `` 145 or: 146 `` 147 perl handlertree.pl 123 456 < output.txt 148 ``[br] 149 This script may be combined with handerlive.pl and handlerviz.pl to produce a 150 graph of the "live" asynchronous operation chains. For example: 151 `` 152 cat output.txt | \ 153 perl handlertree.pl `perl handlerlive.pl output.txt` | \ 154 perl handlerviz.pl | \ 155 dot -Tsvg > output.svg 156 ``[br] 157* Added changes for clang-based Embarcadero C++ compilers. 158* Fixed a deadlock that can occur when multiple threads concurrently initialise 159 the Windows I/O completion port backend. 160* Fixed `async_compose` to work with copyable handlers when passed by lvalue. 161* Fixed completion signature deduction in `co_spawn`. 162* Removed a spurious `Executor` base class from the `executor_binder` 163 implementation. 164* Various fixes and improvements in the documentation and examples. 165 166[heading Asio 1.16.1 / Boost 1.73] 167 168* Fixed compatibility with C++20 concept syntax. 169* Marked the POSIX descriptor classes' move constructors as `noexcept`. 170* Added the `ssl::host_name_verification` class, which is a drop-in replacement 171 for `ssl::rfc2818_verification`. The `ssl::rfc2818_verification` class has 172 been marked as deprecated. As a consequence of this change, SSL support now 173 depends on functions that were introduced in OpenSSL 1.0.2. 174* Added an `ssl::context` constructor to take ownership of a native handle. 175* Changed C++ language version detection with [^gcc] to use `__cplusplus` macro. 176* Fixed a work counting issue in the asynchronous resolve operation for 177 endpoints. 178* Fixed the `strand<>` converting constructors and assignment operators. 179* Ensured that resolvers are restarted correctly after a fork. 180* Fixed compatibility with the current NetBSD release. 181* Removed spurious handler requirement checks in some `async_read` overloads. 182* Changed the `ssl::context` class to propagate non-EOF errors from the 183 `add_certificate_authority` function. 184* Fixed a Windows-specific `thread_pool` destructor hang that occurred when the 185 pool had an associated I/O object. 186* Changed the [^select] reactor to recreate the "self pipe trick" sockets on 187 error. This addresses an issue on some versions of Windows, where these 188 sockets are discconected after a system sleep. 189* Fixed a compile error in the buffered streams due to the lack of reference 190 collapsing in C++98. 191* Changed the `priority_scheduler` example to demonstrate calls to `shutdown()` 192 and `destroy()`. 193* Removed some unnecessary null pointer checks. 194* Changed Windows platform detection to recognise TV titles as Windows apps. 195* Added some emscripten compatibility patches. 196* Fixed a compile error in the `use_awaitable_t::as_default_on` function. 197* Changed all uses of the boost.bind placeholders to use the 198 `boost::placeholders` namespace. 199* Fixed a potential compile error in the `async_compose` implementation due to 200 incorrect overload selection. 201* Suppressed some non-virtual destructor warnings. 202* Various documentation fixes and improvements. 203 204[heading Asio 1.16.0 / Boost 1.72] 205 206* Changed the `async_initiate` helper function to automatically deduce its 207 return type. This is enabled for C++11 or later. 208* Changed all asynchronous operations to use automatically deduced return 209 types. This allows completion token implementations to incorporate the 210 asynchronous operation initiation into the initiating function's return type, 211 without type erasure. Note that C++14 or later is required to support 212 completion tokens that use per-operation return type deduction. For C++11 or 213 earlier, a completion token's async_result specialisation must still provide 214 the nested typedef `return_type`. 215* Introduced three new concepts to support `async_initiate`. 216 * `completion_signature<T>`: Checks if `T` is a signature of the form 217 `R(Args...)`. 218 * `completion_handler_for<T, Signature>`: Checks if `T` is usable as a 219 completion handler with the specified signature. 220 * `completion_token_for<T, Signature>`: Checks if `T` is a completion token 221 that can be used with async_initiate and the specified signature. 222 * For backward compatibility with pre-concepts C++, the macros 223 `BOOST_ASIO_COMPLETION_SIGNATURE`, `BOOST_ASIO_COMPLETION_HANDLER_FOR`, and 224 `BOOST_ASIO_COMPLETION_TOKEN_FOR` are provided. These macros expand to 225 `typename` when concepts are unsupported. 226* Added the nested template type `rebind_executor` to all I/O object types, as 227 a way to generically rebind them to use alternative I/O executors. For 228 example: 229 `` 230 using my_socket_type = tcp::socket::rebind_executor<my_executor_type>::other; 231 ``[br] 232* Changed the asynchronous operations' initiation function objects to report 233 their associated I/O executor via the nested type `executor_type` and member 234 function `get_executor()`. Note that the presence of `executor_type` and 235 `get_executor()` should be treated as optional, and consequently it may be 236 preferable to access them via the `associated_executor` trait and the 237 `get_associated_executor()` helper function. 238* Added the `default_completion_token` trait, so that every I/O executor type 239 now has an associated default completion token type. This trait may be used 240 in asynchronous operation declarations as follows: 241 `` 242 template < 243 typename IoObject, 244 typename CompletionToken = 245 typename default_completion_token< 246 typename IoObject::executor_type 247 >::type 248 > 249 auto async_fyz( 250 IoObject& io_object, 251 CompletionToken&& token = 252 typename default_completion_token< 253 typename IoObject::executor_type 254 >::type{} 255 ); 256 ``[br] 257 If not specialised, this trait type is `void`, meaning no default completion 258 token type is available for the given I/O executor. 259* Specialised the `default_completion_token` trait for the `use_awaitable` 260 completion token, so that it may be used as shown in the following example: 261 `` 262 auto socket = use_awaitable.as_default_on(tcp::socket(my_context)); 263 // ... 264 co_await socket.async_connect(my_endpoint); // Defaults to use_awaitable. 265 ``[br] 266 In this example, the type of the `socket` object is transformed from 267 `tcp::socket` to have an I/O executor with the default completion token set 268 to `use_awaitable`. Alternatively, the socket type may be computed directly: 269 `` 270 using tcp_socket = use_awaitable_t<>::as_default_on_t<tcp::socket>; 271 tcp_socket socket(my_context); 272 // ... 273 co_await socket.async_connect(my_endpoint); // Defaults to use_awaitable. 274 ``[br] 275* Added missing `async_initiate` to the Windows-specific I/O objects' 276 asynchronous operations. 277* Ensured that the executor type is propagated to newly accepted sockets. 278 When synchronously or asynchronously accepting a new connection, but 279 without specifying an executor or execution context, the accept 280 operation will now correctly propagate the executor type from the 281 acceptor to the socket. For example, if your acceptor type is: 282 `` 283 basic_socket_acceptor<ip::tcp, my_executor_type> 284 ``[br] 285 then your accepted socket type will be: 286 `` 287 basic_stream_socket<ip::tcp, my_executor_type> 288 ``[br] 289* Changed to require that `Protocol` copy and move operations never throw. 290* Changed to require that `Endpoint` default constructor and move operations 291 never throw. 292* Added the `noexcept` qualifier to protocol accessors. 293* Added the `noexcept` qualifier to socket move constructors. 294* Fixed issues associated with opening serial ports on Windows: 295 * Use the correct constant to initialise the RTS control flag. 296 * Specify a default baud rate (9600). 297* Fixed a lost "outstanding work count" that can occur when an asynchronous 298 accept operation is automatically restarted. 299 300[heading Asio 1.14.1 / Boost 1.71] 301 302* Improved performance slightly by eliminating a redundant move construction 303 when completed handlers are dispatched. 304* Eliminated a compiler warning by annotating a `case` fall-through in 305 the free function `connect()` implementation. 306* Fixed the `is_*_buffer_sequence` detection traits for user-defined sequence 307 types. 308* Fixed some Windows-specific warnings about an incompatible pointer cast when 309 obtaining the `CancelIoEx` entry point. 310* Changed to automatically set the defaults when opening a serial port on 311 Windows. 312* Changed the serial port `get_option()` member function to be const. 313* Fixed a name hiding issue with the WinRT stream-oriented socket backend's 314 `shutdown` function. 315* Applied a minor fix to the documentation for `is_dynamic_buffer`. 316* Added some support for Haiku OS. 317* Added wolfSSL compatability. 318* Changed to require C++17 or later for coroutines TS support with clang. 319* Fixed a doxygen generation problem in the tutorial. 320* Ensured example programs are correctly incorporated into the documentation. 321 322[heading Asio 1.14.0 / Boost 1.70] 323 324* Added custom I/O executor support to I/O objects. 325 * All I/O objects now have an additional `Executor` template parameter. This 326 template parameter defaults to the `asio::executor` type (the polymorphic 327 executor wrapper) but can be used to specify a user-defined executor 328 type. 329 * I/O objects' constructors and functions that previously took an 330 `asio::io_context&` now accept either an `Executor` or a reference to a 331 concrete `ExecutionContext` (such as `asio::io_context` or 332 `asio::thread_pool`). 333 * Note: One potential source of breakage in existing user code is when reusing an 334 I/O object's `io_context` for constructing another I/O object, as in: 335 `` 336 asio::steady_timer my_timer(my_socket.get_executor().context()); 337 ``[br] 338 To fix this, either construct the second I/O object using the first I/O 339 object's executor:[br] 340 `` 341 asio::steady_timer my_timer(my_socket.get_executor()); 342 ``[br] 343 or otherwise explicitly pass the `io_context`:[br] 344 `` 345 asio::steady_timer my_timer(my_io_context); 346 ``[br] 347 * The previously deprecated `get_io_context` and `get_io_service` 348 member functions have now been removed. 349 * The previously deprecated service template parameters, and the 350 corresponding classes, have now been removed. 351* Added a new `async_result` form with an `initiate` static member function. 352 * The `async_result` template now supports a new form: 353 `` 354 template <typename CompletionToken, typename Signature> 355 struct async_result 356 { 357 typedef /* ... */ return_type; 358 359 template <typename Initiation, 360 typename RawCompletionToken, 361 typename... Args> 362 static return_type initiate( 363 Initiation&& initiation, 364 RawCompletionToken&& token, 365 Args&&... args); 366 }; 367 ``[br] 368 * The `initiate` member function must: (a) transform the token into a 369 completion handler object `handler`; (b) cause the invocation of the 370 function object `initiation` as if by calling 371 `std::forward<Initiation>(initiation)(std::move(handler), 372 std::forward<Args>(args)...)`. Note that the invocation of `initiation` 373 may be deferred (e.g. lazily evaluated), in which case `initiation` and 374 `args` must be decay-copied and moved as required. 375 * A helper function template `async_initiate` has also been added as a 376 wrapper for the invocation of `async_result<>::initiate`. For backward 377 compatibility, this function supports both the old and new `async_result` 378 forms. 379 * The composed operations examples have been updated to use `async_initiate`. 380 * The previously deprecated `handler_type` trait and single-argument form of 381 `async_result` have now been removed. 382* Updated the Coroutines TS support and promoted it to the `asio` namespace. 383 * The `awaitable<>`, `co_spawn`, `this_coro`, `detached`, and 384 `redirect_error` facilities have been moved from the `asio::experimental` 385 namespace to namespace `asio`. As part of this change, the 386 `this_coro::token()` awaitable has been superseded by the 387 `asio::use_awaitable` completion token. 388 * Please note that the `use_awaitable` and `redirect_error` completion tokens 389 work only with asynchronous operations that use the new form of 390 `async_result` with member function `initiate`. Furthermore, when using 391 `use_awaitable`, please be aware that the asynchronous operation is not 392 initiated until `co_await` is applied to the `awaitable<>`. 393* Added a new `DynamicBuffer_v2` concept which is CopyConstructible. 394 * This change adds a new set of type requirements for dynamic buffers, 395 `DynamicBuffer_v2`, which supports copy construction. These new type 396 requirements enable dynamic buffers to be used as arguments to 397 user-defined composed operations, where the same dynamic buffer object 398 is used repeatedly for multiple underlying operations. For example:[br] 399 `` 400 template <typename DynamicBuffer> 401 void echo_line(tcp::socket& sock, DynamicBuffer buf) 402 { 403 n = asio::read_until(sock, buf, '\n'); 404 asio::write(sock, buf, asio::transfer_exactly(n)); 405 } 406 ``[br] 407 * The original `DynamicBuffer` type requirements have been renamed to 408 `DynamicBuffer_v1`. These requirements continue to be compatible with the 409 Networking TS. 410 * New type traits `is_dynamic_buffer_v1` and `is_dynamic_buffer_v2` have been 411 added to test for conformance to `DynamicBuffer_v1` and `DynamicBuffer_v2` 412 respectively. The existing `is_dynamic_buffer` trait has been retained and 413 delegates to `is_dynamic_buffer_v1` (unless `BOOST_ASIO_NO_DYNAMIC_BUFFER_V1` is 414 explicitly defined, in which case it delegates to `is_dynamic_buffer_v2`). 415 * For convenience, the `dynamic_string_buffer` and `dynamic_vector_buffer` 416 classes conform to both `DynamicBuffer_v1` and `DynamicBuffer_v2` 417 requirements. 418 * When `BOOST_ASIO_NO_DYNAMIC_BUFFER_V1` is defined, all support for 419 `DynamicBuffer_v1` types and functions is #ifdef-ed out. Support for using 420 `basic_streambuf` with the `read`, `async_read`, `read_until`, 421 `async_read_until`, `write`, and `async_write` functions is also disabled 422 as a consequence. 423 * Note: This change should have no impact on existing source code that simply 424 uses dynamic buffers in conjunction with Asio's composed operations. 425* Added a new `async_compose` function that simplifies the implementation of 426 user-defined asynchronous operations. 427* Added a `make_strand` function, which creates a `strand` with a deduced 428 `Executor` template argument. 429* Relaxed the completion condition type requirements to only require 430 move-constructibility rather than copy-constructibility. 431* Added a constructor for `local::basic_endpoint` that takes a `string_view`. 432* Added the noexcept qualifier to various member functions of the 433 `ip::address`, `ip::address_v4`, `ip::address_v6`, `ip::basic_endpoint`, and 434 `executor_work_guard` classes. 435* Added the noexcept qualifier to the `buffer_sequence_begin` and 436 `buffer_sequence_end` functions. 437* Added a new `BOOST_ASIO_DISABLE_VISIBILITY` configuration `#define` that allows 438 visibility pragmas to be disabled. (Note: If symbols are hidden, extra care 439 must be taken to ensure that Asio types are not passed across shared 440 library API boundaries.) 441* Enabled recycling of the memory used to type-erase a function object with the 442 polymorphic executor. 443* Changed receive operations to return the correct number of bytes transferred 444 when truncation (`error::message_size`) occurs on a datagram-oriented socket. 445* Fixed multicast behaviour on QNX by automatically applying `SO_REUSEPORT` 446 when the `reuse_address` option is set. 447* Added inclusion of `unistd.h` when targeting Haiku OS, to fix feature detection. 448* Added the `network_v[46].hpp` headers to the top-level convenience header. 449* Fixed calculation of absolute timeout when the backend uses 450 `pthread_cond_timedwait`. 451* Changed the range-based asynchronous connect operation to deduce the 452 `EndpointSequence` iterator type rather than assume the presence of a 453 `const_iterator` typedef. 454* Fixed `buffer_sequence_begin` and `buffer_sequence_end` to prevent implicit 455 conversion. This change addresses an issue where a call to 456 `buffer_sequence_begin` or `buffer_sequence_end` could trigger an implicit 457 conversion to `const_buffer` or `mutable_buffer`. Whenever this implicit 458 conversion occurred, the return value of `buffer_sequence_begin` or 459 `buffer_sequence_end` would point to a temporary object. 460* Ensured SSL handshake errors are propagated to the peer before the local 461 operation completes. 462* Suppressed the `eof` error on SSL shutdown as it actually indicates success. 463* Added a fallback error code for when we OpenSSL produces an 464 `SSL_ERROR_SYSCALL` result without an associated error. 465* Changed composed asynchronous read and write operations to move, rather than 466 copy, the buffer sequence objects when the composed operation implementation 467 is moved. 468* Changed to use `<atomic>` when targeting apple/clang/libc++ with recent Xcode 469 versions, even for C++03. This fixes a warning about the deprecation of 470 `OSMemoryBarrier`. 471* Fixed compile errors that occur when using the composed read and write 472 operations with MSVC 11.0, by disabling `decltype` support for that compiler. 473* Increased the default value of `_WIN32_WINNT` to `0x0601` (Windows 7). 474* Fixed `dispatch` documentation to note that it may call the supplied function 475 object in the current thread. 476* Updated `post` and `defer` documentation to clarify the the distinction 477 between them. 478* Fixed compilation errors in the read and write composed operations when used 479 with MSVC 11.0. 480* Fixed a Windows-specific issue where the execution context associated with 481 `system_executor` was not being correctly cleaned up on exit. 482 483[heading Asio 1.12.2 / Boost 1.69] 484 485* Fixed a problem with the detection of `std::future` availability with 486 libstdc++. 487* Fixed compile error in regex overload of `read_until`. 488* Fixed a timer heap corruption issue that can occur when moving a cancelled 489 timer. 490* Fixed detection of `std::experimental::string_view` and `std::string_view` 491 with newer clang/libc++. 492* Fixed MSVC version detection for availability of `std::invoke_result`. 493* Fixed the buffer sequence traits to test the new requirements, if `decltype` 494 is available. 495* Fixed an MSVC issue when building with exceptions disabled. 496* Added SSL context options for TLS v1.3. 497* Added a compile-time test for TLS v1 support. 498* Fixed the macro used to test for TLS v1.2 support. 499* Prevented global objects from being created once per thread on Windows. 500* Fixed a crash when using `size()`, `max_size()` or `empty()` on 501 default-constructed resolver results. 502* Changed to move the return value in basic_resolver_results::begin() to avoid 503 copying. 504* Enabled move support for the Intel Compiler. 505* Fixed `std::string_view` detection issue when using clang-cl. 506* Fixed the handler tracking operation name for 507 `io_context::executor_type::dispatch`. 508* Fixed a buffer overflow that could occur when parsing an address string with 509 a 64-bit scope id. 510* Added examples showing how to write composed operations. 511* Added C++11 versions of the Timeouts, Timers, SOCKS4 and SSL examples. 512* Fixed minor issues in documentation and examples. 513 514[heading Asio 1.12.1 / Boost 1.67] 515 516* Added missing const qualifier to `basic_socket_acceptor::get_option`. 517* Worked around a parsing error that occurs with some versions of gcc. 518* Fixed broken code samples in tutorial. 519* Added new experimental features. (Note that "experimental" features may be 520 changed without notice in subsequent releases.) 521 * Added `experimental::detached` completion token. 522 * Added `experimental::redirect_error` completion token. 523 * Added `experimental::co_spawn` facility for integration with the coroutines 524 technical specification. 525* Updated timeout examples to use latest features. 526 * Used `asio::steady_timer` rather than `asio::deadline_timer`. 527 * Used `asio::dynamic_buffer` rather than `asio::streambuf`. 528 * Used timed `asio::io_context::run_for()` function for blocking clients. 529 * Added example showing a custom completion token for blocking with timeouts. 530* Fixed unit tests to compile when `BOOST_ASIO_NO_DEPRECATED` is defined. 531* Changed socket iostreams to use chrono by default, to fix compatibility with 532 the Networking TS. Define `BOOST_ASIO_USE_BOOST_DATE_TIME_FOR_SOCKET_IOSTREAM` 533 to enable the old Boost.Date_Time interface in `basic_socket_streambuf` and 534 `basic_socket_iostream`. 535* Updated examples to use chrono rather than Boost.Date_Time. 536* Fixed an incorrect member function detector in the `is_dynamic_buffer` trait. 537* Fixed an `async_result` incompatibility with deprecated `handler_type`. 538* Added a missing move optimisation in the SSL stream implementation. 539* Fixed incorrect `basic_resolver_results::value_type` typedef. 540* Fixed a compile error with some OpenSSL versions when `SSL_OP_NO_COMPRESSION` 541 is defined. 542* Changed `add_certificate_authority` to process multiple certificates in a bundle. 543* Eliminated deprecation warning with MSVC by using `std::invoke_result` rather 544 than `std::result_of`. 545* Changed to use `std::string_view` for C++17 or later, and 546 `std::experimental::string_view` for C++14. Define the preprocessor macro 547 `BOOST_ASIO_DISABLE_STD_STRING_VIEW` to force the use of 548 std::experimental::string_view (assuming it is available) when compiling in 549 C++17 mode. 550* Ensured `DynamicBuffer` template arguments are decayed before using in 551 `enable_if` tests. 552* Changed documentation to distinguish legacy completion handlers (which are 553 still required to be CopyConstructible) from new MoveConstructible handlers. 554* Suppressed a discarded return value warning in the buffer debugging support. 555* Fixed `basic_yield_context` to work with completion signatures containing 556 reference parameters. 557* Ensured that stackful coroutines launched using `spawn()` correctly store 558 decayed copies of their function and handler arguments. 559* Fixed some compatibility issues with Android. 560* Added cross-compilation support to Jamfiles. 561* Fixed some minor portability issues in examples. 562 563[heading Asio 1.12.0 / Boost 1.66] 564 565* Implemented interface changes to reflect the Networking TS 566 ([@www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4656.pdf N4656]). 567 * See the [link boost_asio.net_ts list] of new interfaces and, where 568 applicable, the corresponding old interfaces that have been superseded. 569 * The service template parameters, and the corresponding classes, are disabled 570 by default. For example, instead of `basic_socket<Protocol, SocketService>` we 571 now have simply `basic_socket<Protocol>`. The old interface can be enabled by 572 defining the `BOOST_ASIO_ENABLE_OLD_SERVICES` macro. 573* Removed previously deprecated functions. 574* Added support for customised handler tracking. 575* Added reactor-related (i.e. descriptor readiness) events to handler tracking. 576* Added special [link boost_asio.overview.core.concurrency_hint concurrency 577 hint] values that may be used to disable locking on a per `io_context` basis. 578* Enabled perfect forwarding for the first `ssl::stream<>` constructor argument. 579* Added ability to release ownership of the underlying native socket. (Requires 580 Windows 8.1 or later when using the I/O completion port backend.) 581 582[heading Asio 1.10.10 / Boost 1.65] 583 584* Changed to require [^g++] versions >= 4.7 to use standard atomics, to fix 585 a linker error when using [^g++] 4.6 ([ticket 13121]). 586* Enabled use of `constexpr` and variadic templates with recent MSVC versions. 587* Fixed a race condition in the Linux epoll backend, which may occur when a 588 socket or descriptor is closed while another thread is blocked on epoll. 589* Eliminated use of deprecated `auto_ptr`. 590* Fixed misplaced use of `asio_handler_is_continuation` result in reactive 591 `async_accept` implementation. 592* Changed to use `poll.h` rather than `sys/poll.h` on some modern POSIX 593 platforms ([ticket 12419]). 594* Fixed MSVC intellisense detection. 595* Disabled use of the `__thread` keyword extension for android/clang/x86 596 targets. 597 598[heading Asio 1.10.9 / Boost 1.64] 599 600* Added limited support for using regular file descriptors (where I/O 601 operations should never fail with `EAGAIN` or `EWOULDBLOCK`) with 602 `posix::stream_descriptor`, when using the Linux epoll backend. 603* Changed to use `allocator_traits` to rebind allocators in C++11 or later. 604* Eliminated a double "construction" issue in the converting move constructors. 605* Added new `ssl::context_base` enumerations to enable support for any TLS 606 version, and improved consistency of SSL/TLS version handling across OpenSSL 607 releases. 608* Applied more changes to address OpenSSL 1.1 compatibility. 609* Fixed a compile error when OpenSSL compression is disabled at compile time. 610* Suppressed some spurious unused variable warnings issued by [^gcc] ([ticket 611 12302]). 612* Worked around a new clang warning issued for usage of the comma operator. 613* Fixed various header ordering problems. 614* Changed to refer `std::atomic_thread_fence`, when available, to eliminate a 615 deprecated function warning on newest macOS SDK ([ticket 12482]). 616* Added a workaround for broken `getaddrinfo` in Apple's NAT64 environment. 617* Fixed an exception safety issue in the internal hash map implementation. 618 619[heading Asio 1.10.8 / Boost 1.62] 620 621* Added compatibility with OpenSSL 1.1.0 ([ticket 12238]). 622* Fixed out-of-bounds iterator use in `asio::connect()` when the 623 `connect_condition` returns an end iterator ([ticket 12354]). 624* Added a workaround for a move detection problem on MSVC 2015 Update 2 625 ([ticket 12115]). 626* Changed a workaround that was previously added for broken Windows firewalls 627 to only bind to 127.0.0.1 if `getsockname` reports 0.0.0.0 ([ticket 628 12406]). 629* Added call to `SSL_COMP_free_compression_methods` to fix two memory leaks 630 reported at shutdown, for OpenSSL versions >= 1.0.2 and < 1.1.0 ([ticket 631 10795]). 632* Fixed `use_future` compile error encountered on some standard library 633 implementations, by changing `std::allocator<void>` use to a non-void 634 template parameter. 635* Enabled use of native `getaddrinfo` by default on Apple OSes, rather than 636 emulation in terms of `getipnodebyname`. 637 638[heading Asio 1.10.7 / Boost 1.60] 639 640* Added support for Windows 8.1 Store apps. 641* Fixed macro multiple definition error on Microsoft Visual Studio 2015 642 ([ticket 11539]). 643* Changed Asio's SSL wrapper to respect OpenSSL's `OPENSSL_NO_SSL3` feature 644 test `#define` ([ticket 11754]). 645* Changed Asio's SSL wrapper to use OpenSSL's new `SSL_CTX_clear_chain_certs` 646 function, if available. 647* Suppressed a clang 3.6+ warning about unused typedefs ([ticket 11767]). 648* Regenerated certificates used by SSL examples. 649* Fixed buffer sizes passed to `strncat` in the `getaddrinfo` emulation and in 650 the SSL wrapper's password handling. 651* Changed Windows backend to use non-macro `CreateEventW` rather than 652 `CreateEvent` ([ticket 11732]). 653 654[heading Asio 1.10.6 / Boost 1.58] 655 656* Ensured errors generated by Windows' `ConnectEx` function are mapped to their 657 portable equivalents ([ticket 10744]). 658* Added new macro `BOOST_ASIO_DISABLE_CONNECTEX` to allow use of `ConnectEx` to 659 be explicitly disabled. 660* Fixed a race condition in `windows::object_handle` when there are pending 661 wait operations on destruction ([ticket 10624]). 662* Fixed IPv6 address parsing on FreeBSD, where a trailing scope ID would cause 663 conversion to fail with `EINVAL`. 664* Worked around shared library visibility issues by ensuring Asio types use 665 default visibility ([ticket 9465], [ticket 11070]). 666* Changed the SSL wrapper to call the password callback when loading an 667 in-memory key ([ticket 10828]). 668* Fixed false SSL error reports by ensuring that the SSL error queue is cleared 669 prior to each operation. 670* Fixed an `ssl::stream<>` bug that may result in spurious 'short read' errors. 671* Removed a redundant null pointer check in the SSL engine ([ticket 10088]). 672* Added options for disabling TLS v1.1 and v1.2 ([ticket 10690]). 673* Removed use of deprecated OpenSSL function `ERR_remove_state`. 674* Fixed detection of various C++11 features with Clang ([ticket 8835], 675 [ticket 10884]). 676* Fixed detection of C++11 `std::addressof` with [^g++] ([ticket 10982]). 677* Changed multicast test to treat certain `join_group` failures as non-fatal. 678* Decoupled Asio unit tests from Boost.Test ([ticket 11116]). 679* Changed the tutorial to use `std::endl` to ensure output is flushed. 680* Fixed an unsigned integer overflow reported by Clang's integer sanitizer. 681* Added support for move-only return types when using a `yield_context` object 682 with asynchronous operations. 683* Changed `yield_context` to allow reentrant calls to the completion handler 684 from an initiating function. 685* Updated detection of Windows Runtime to work with latest Windows SDK. 686 687[heading Asio 1.10.5 / Boost 1.57] 688 689* Fixed the [^kqueue] reactor so that it works on FreeBSD ([ticket 10606]). 690* Fixed an issue in the [^kqueue] reactor which resulted in spinning when using 691 serial ports on Mac OS ([ticket 10496]). 692* Fixed [^kqueue] reactor support for read-only file descriptors 693 ([ticket 10367]). 694* Fixed a compile error when using the [^/dev/poll] reactor ([ticket 10350], 695 [ticket 10572]). 696* Changed the Windows backend to use `WSASocketW`, as `WSASocketA` has been 697 deprecated ([ticket 10534]). 698* Fixed some warnings reported by Visual C++ 2013 ([ticket 10376]). 699* Fixed integer type used in the WinRT version of the byte-order conversion 700 functions ([ticket 10539]). 701* Changed documentation to indicate that `use_future` and `spawn()` are not 702 made available when including the `asio.hpp` convenience header ([ticket 703 10567]). 704* Explicitly marked `asio::strand` as deprecated. Use 705 `asio::io_service::strand` instead. 706 707[heading Asio 1.10.4 / Boost 1.56] 708 709* Stopped using certain Winsock functions that are marked as deprecated in the 710 latest Visual C++ and Windows SDK. 711* Fixed a shadow variable warning on Windows. 712* Fixed a regression in the [^kqueue] backend that was introduced in Asio 713 1.10.2. 714* Added a workaround for building the unit tests with [^gcc] on AIX. 715 716[heading Asio 1.10.3] 717 718* Worked around a [^gcc] problem to do with anonymous enums ([ticket 10042]). 719* Reverted the Windows `HANDLE` backend change to ignore `ERROR_MORE_DATA`. 720 Instead, the error will be propagated as with any other (i.e. in an 721 `error_code` or thrown as a `system_error`), and the number of bytes 722 transferred will be returned. For code that needs to handle partial messages, 723 the `error_code` overload should be used ([ticket 10034]). 724* Fixed an off-by-one error in the `signal_set` implementation's signal 725 number check ([ticket 9324]). 726* Changed the Windows IOCP backend to not assume that 727 `SO_UPDATE_CONNECT_CONTEXT` is defined ([ticket 10016]). 728* Fixed a Windows-specific issue, introduced in Asio 1.10.2, by using 729 `VerifyVersionInfo` rather than `GetVersionEx`, as `GetVersionEx` has been 730 deprecated. 731* Changed to use SSE2 intrinsics rather than inline assembly, to allow the 732 Cray compiler to work. 733 734[heading Asio 1.10.2] 735 736* Fixed `asio::spawn()` to work correctly with new Boost.Coroutine interface 737 ([ticket 9442], [ticket 9928]). 738* Ensured that incomplete `asio::spawn()` coroutines are correctly unwound when 739 cleaned up by the `io_service` destructor ([ticket 9731]). 740* Fixed delegation of continuation hook for handlers produced by 741 `io_service::wrap()` and `strand::wrap()` ([ticket 9741]). 742* Changed the Windows I/O completion port backend to use `ConnectEx`, if 743 available, for connection-oriented IP sockets. 744* Changed the `io_service` backend for non-Windows (and non-IOCP Windows) 745 platforms to use a single condition variable per `io_service` instance. 746 This addresses a potential race condition when `run_one()` is used from 747 multiple threads. 748* Prevented integer overflow when computing timeouts based on some 749 `boost::chrono` and `std::chrono` clocks ([ticket 9662], [ticket 9778]). 750* Made further changes to `EV_CLEAR` handling in the kqueue backend, to address 751 other cases where the `close()` system call may hang on Mac OS X. 752* Fixed infinite recursion in implementation of 753 `resolver_query_base::flags::operator~` ([ticket 9548]). 754* Made the `select` reactor more efficient on Windows for large numbers of 755 sockets ([ticket 9528]). 756* Fixed a Windows-specific type-aliasing issue reported by [^gcc] ([ticket 757 9550]). 758* Prevented execution of compile-time-only buffer test to avoid triggering an 759 address sanitiser warning ([ticket 8295]). 760* Disabled the `GetQueuedCompletionStatus` timeout workaround on recent 761 versions of Windows. 762* Added support for string-based scope IDs when using link-local multicast 763 addresses. 764* Changed IPv6 multicast group join to use the address's scope ID as the 765 interface, if an interface is not explicitly specified. 766* Fixed multicast test failure on Mac OS X and the BSDs by using a link-local 767 multicast address. 768* Various minor documentation improvements ([ticket 8295], [ticket 9605], 769 [ticket 9771]). 770 771[heading Asio 1.10.1 / Boost 1.55] 772 773* Implemented a limited port to Windows Runtime. This support requires that the 774 language extensions be enabled. Due to the restricted facilities exposed by 775 the Windows Runtime API, the port also comes with the following caveats: 776 * The core facilities such as the `io_service`, `strand`, buffers, composed 777 operations, timers, etc., should all work as normal. 778 * For sockets, only client-side TCP is supported. 779 * Explicit binding of a client-side TCP socket is not supported. 780 * The `cancel()` function is not supported for sockets. Asynchronous 781 operations may only be cancelled by closing the socket. 782 * Operations that use `null_buffers` are not supported. 783 * Only `tcp::no_delay` and `socket_base::keep_alive` options are supported. 784 * Resolvers do not support service names, only numbers. I.e. you must 785 use "80" rather than "http". 786 * Most resolver query flags have no effect. 787* Fixed a regression (introduced in Boost 1.54) where, on some platforms, errors 788 from `async_connect` were not correctly propagated through to the completion 789 handler ([ticket 8795]). 790* Fixed a Windows-specific regression (introduced in Boost 1.54) that occurs 791 when multiple threads are running an `io_service`. When the bug occurs, the 792 result of an asynchronous operation (error and bytes tranferred) is 793 incorrectly discarded and zero values used instead. For TCP sockets this 794 results in spurious end-of-file notifications ([ticket 8933]). 795* Fixed a bug in handler tracking, where it was not correctly printing out some 796 handler IDs ([ticket 8808]). 797* Fixed the comparison used to test for successful synchronous accept 798 operations so that it works correctly with unsigned socket descriptors 799 ([ticket 8752]). 800* Ensured the signal number is correctly passed to the completion handler when 801 starting an `async_wait` on a signal that is already raised ([ticket 8738]). 802* Suppressed a g++ 4.8+ warning about unused typedefs ([ticket 8980]). 803* Enabled the move optimisation for handlers that use the default invocation 804 hook ([ticket 8624]). 805* Clarified that programs must not issue overlapping `async_write_at` 806 operations ([ticket 8669]). 807* Changed the Windows `HANDLE` backend to treat `ERROR_MORE_DATA` as a 808 non-fatal error when returned by `GetOverlappedResult` for a synchronous 809 read ([ticket 8722]). 810* Visual C++ language extensions use `generic` as a keyword. Added a 811 workaround that renames the namespace to `cpp_generic` when those language 812 extensions are in effect. 813* Fixed some asynchronous operations that missed out on getting `async_result` 814 support in Boost 1.54. In particular, the buffered stream templates have been 815 updated so that they adhere to current handler patterns ([ticket 9000], 816 [ticket 9001]). 817* Enabled move support for Microsoft Visual Studio 2012 ([ticket 8959]). 818* Added `use_future` support for Microsoft Visual Studio 2012. 819* Removed a use of `std::min` in the Windows IOCP backend to avoid a 820 dependency on the `<algorithm>` header ([ticket 8758]). 821* Eliminated some unnecessary handler copies. 822* Fixed support for older versions of OpenSSL that do not provide the 823 `SSL_CTX_clear_options` function ([ticket 9273]). 824* Fixed various minor and cosmetic issues in code and documentation 825 (including [ticket 8347], [ticket 8950], [ticket 8953], [ticket 8965], 826 [ticket 8997], [ticket 9230]). 827 828[heading Asio 1.10.0 / Boost 1.54] 829 830* Added new traits classes, `handler_type` and `async_result`, that allow the 831 customisation of the return type of an initiating function. 832* Added the `asio::spawn()` function, a high-level wrapper for running 833 stackful coroutines, based on the Boost.Coroutine library. The `spawn()` 834 function enables programs to implement asynchronous logic in a synchronous 835 manner. For example: `size_t n = my_socket.async_read_some(my_buffer, yield);`. 836 For further information, see [link boost_asio.overview.core.spawn Stackful 837 Coroutines]. 838* Added the `asio::use_future` special value, which provides first-class 839 support for returning a C++11 `std::future` from an asynchronous 840 operation's initiating function. For example: 841 `future<size_t> = my_socket.async_read_some(my_buffer, asio::use_future);`. 842 For further information, see [link boost_asio.overview.cpp2011.futures C++ 843 2011 Support - Futures]. 844* Promoted the stackless coroutine class and macros to be part of Asio's 845 documented interface, rather than part of the HTTP server 4 example. 846 For further information, see [link boost_asio.overview.core.coroutine 847 Stackless Coroutines]. 848* Added a new handler hook called `asio_handler_is_continuation`. 849 Asynchronous operations may represent a continuation of the asynchronous 850 control flow associated with the current executing handler. The 851 `asio_handler_is_continuation` hook can be customised to return `true` if 852 this is the case, and Asio's implementation can use this knowledge to 853 optimise scheduling of the new handler. To cover common cases, Asio 854 customises the hook for strands, `spawn()` and composed asynchronous 855 operations. 856* Added four new generic protocol classes, `generic::datagram_protocol`, 857 `generic::raw_protocol`, `generic::seq_packet_protocol` and 858 `generic::stream_protocol`, which implement the `Protocol` type 859 requirements, but allow the user to specify the address family (e.g. 860 `AF_INET`) and protocol type (e.g. `IPPROTO_TCP`) at runtime. 861 For further information, see [link 862 boost_asio.overview.networking.other_protocols Support for Other Protocols]. 863* Added C++11 move constructors that allow the conversion of a socket (or 864 acceptor) into a more generic type. For example, an `ip::tcp::socket` can 865 be converted into a `generic::stream_protocol::socket` via move 866 construction. 867 For further information, see [link 868 boost_asio.overview.networking.other_protocols Support for Other Protocols]. 869* Extended the `basic_socket_acceptor<>`'s `accept()` and `async_accept()` 870 functions to allow a new connection to be accepted directly into a socket 871 of a more generic type. For example, an `ip::tcp::acceptor` can be used to 872 accept into a `generic::stream_protocol::socket` object. 873 For further information, see [link 874 boost_asio.overview.networking.other_protocols Support for Other Protocols]. 875* Moved existing examples into a C++03-specific directory, and added a new 876 directory for C++11-specific examples. A limited subset of the C++03 877 examples have been converted to their C++11 equivalents. 878* Various SSL enhancements. Thanks go to Nick Jones, on whose work these changes 879 are based. 880 * Added support for SSL handshakes with re-use of data already read from 881 the wire. New overloads of the `ssl::stream<>` class's `handshake()` and 882 `async_handshake()` functions have been added. These accept a 883 `ConstBufferSequence` to be used as initial input to the ssl engine for 884 the handshake procedure. 885 * Added support for creation of TLSv1.1 and TLSv1.2 `ssl::context` objects. 886 * Added a `set_verify_depth()` function to the `ssl::context` and 887 `ssl::stream<>` classes. 888 * Added the ability to load SSL certificate and key data from memory 889 buffers. New functions, `add_certificate_authority()`, 890 `use_certificate()`, `use_certificate_chain()`, `use_private_key()`, 891 `use_rsa_private_key()` and `use_tmp_dh()`, have been added to the 892 `ssl::context` class. 893 * Changed `ssl::context` to automatically disable SSL compression by 894 default. To enable, use the new `ssl::context::clear_options()` function, 895 as in `my_context.clear_options(ssl::context::no_compression)`. 896* Fixed a potential deadlock in `signal_set` implementation. 897* Fixed an error in acceptor example in documentation [ticket 8421]. 898* Fixed copy-paste errors in waitable timer documentation [ticket 8602]. 899* Added assertions to satisfy some code analysis tools [ticket 7739]. 900* Fixed a malformed `#warning` directive [ticket 7939]. 901* Fixed a potential data race in the Linux `epoll` implementation. 902* Fixed a Windows-specific bug, where certain operations might generate an 903 `error_code` with an invalid (i.e. `NULL`) `error_category` [ticket 8613]. 904* Fixed `basic_waitable_timer`'s underlying implementation so that it can 905 handle any `time_point` value without overflowing the intermediate duration 906 objects. 907* Fixed a problem with lost thread wakeups that can occur when making 908 concurrent calls to `run()` and `poll()` on the same `io_service` object 909 [ticket 8354]. 910* Fixed implementation of asynchronous connect operation so that it can cope 911 with spurious readiness notifications from the reactor [ticket 7961]. 912* Fixed a memory leak in the `ssl::rfc2818_verification` class. 913* Added a mechanism for disabling automatic Winsock initialisation [ticket 914 3605]. See the header file [^boost/asio/detail/winsock_init.hpp] for details. 915 916[heading Asio 1.8.3 / Boost 1.53] 917 918* Fixed some 64-to-32-bit conversion warnings ([ticket 7459]). 919* Fixed some small errors in documentation and comments ([ticket 7761]). 920* Fixed an error in the example embedded in `basic_socket::get_option`'s 921 documentation ([ticket 7562]). 922* Changed to use `long` rather than `int` for SSL_CTX options, to match OpenSSL 923 ([ticket 7209]). 924* Changed to use `_snwprintf` to address a compile error due to the changed 925 `swprintf` signature in recent versions of MinGW ([ticket 7373]). 926* Fixed a deadlock that can occur on Windows when shutting down a pool of 927 `io_service` threads due to running out of work ([ticket 7552]). 928* Enabled the `noexcept` qualifier for error categories ([ticket 7797]). 929* Changed UNIX domain socket example to treat errors from `accept` as non-fatal 930 ([ticket 7488]). 931* Added a small block recycling optimisation to improve default memory 932 allocation behaviour. 933 934[heading Asio 1.8.2 / Boost 1.51] 935 936* Fixed an incompatibility between `ip::tcp::iostream` and C++11 937 ([@https://svn.boost.org/trac/boost/ticket/7162 #7162]). 938* Decorated GCC attribute names with underscores to prevent interaction 939 with user-defined macros 940 ([@https://svn.boost.org/trac/boost/ticket/6415 #6415]). 941* Added missing `#include <cctype>`, needed for some versions of MinGW. 942* Changed to use [^gcc]'s atomic builtins on ARM CPUs, when available 943 ([@https://svn.boost.org/trac/boost/ticket/7140 #7140]). 944* Changed strand destruction to be a no-op, to allow strand objects to be 945 destroyed after their associated `io_service` has been destroyed. 946* Added support for some newer versions of glibc which provide the 947 `epoll_create1()` function but always fail with `ENOSYS` 948 ([@https://svn.boost.org/trac/boost/ticket/7012 #7012]). 949* Changed the SSL implementation to throw an exception if SSL engine 950 initialisation fails 951 ([@https://svn.boost.org/trac/boost/ticket/6303 #6303]). 952* Fixed another regression in `buffered_write_stream` 953 ([@https://svn.boost.org/trac/boost/ticket/6310 #6310]). 954* Implemented various minor performance improvements, primarily targeted at 955 Linux x86 and x86-64 platforms. 956 957[heading Asio 1.8.1 / Boost 1.50] 958 959* Changed the `epoll_reactor` backend to do lazy registration for `EPOLLOUT` 960 events. 961* Fixed the `epoll_reactor` handling of out-of-band data, which was broken by 962 an incomplete fix in the last release. 963* Changed Asio's SSL wrapper to respect OpenSSL's `OPENSSL_NO_ENGINE` feature 964 test `#define` ([@https://svn.boost.org/trac/boost/ticket/6432 #6432]). 965* Fixed `windows::object_handle` so that it works with Windows compilers that 966 support C++11 move semantics (such as [^g++]). 967* Improved the performance of strand rescheduling. 968* Added support for [^g++] 4.7 when compiling in C++11 mode 969 ([@https://svn.boost.org/trac/boost/ticket/6620 #6620]). 970* Fixed a problem where `signal_set` handlers were not being delivered when 971 the `io_service` was constructed with a `concurrency_hint` of 1 972 ([@https://svn.boost.org/trac/boost/ticket/6657 #6657]). 973 974[heading Asio 1.8.0 / Boost 1.49] 975 976* Added a new class template `basic_waitable_timer` based around the C++11 clock 977 type requirements. It may be used with the clocks from the C++11 `<chrono>` 978 library facility or, if those are not available, Boost.Chrono. The typedefs 979 `high_resolution_timer`, `steady_timer` and `system_timer` may be used to 980 create timer objects for the standard clock types. 981* Added a new `windows::object_handle` class for performing waits on Windows 982 kernel objects. Thanks go to Boris Schaeling for contributing substantially 983 to the development of this feature. 984* On Linux, `connect()` can return EAGAIN in certain circumstances. Remapped 985 this to another error so that it doesn't look like a non-blocking operation 986 ([@https://svn.boost.org/trac/boost/ticket/6048 #6048]). 987* Fixed a compile error on NetBSD 988 ([@https://svn.boost.org/trac/boost/ticket/6098 #6098]). 989* Fixed deadlock on Mac OS X 990 ([@https://svn.boost.org/trac/boost/ticket/6275 #6275]). 991* Fixed a regression in `buffered_write_stream` 992 ([@https://svn.boost.org/trac/boost/ticket/6310 #6310]). 993* Fixed a non-paged pool "leak" on Windows when an `io_service` is repeatedly 994 run without anything to do 995 ([@https://svn.boost.org/trac/boost/ticket/6321 #6321]). 996* Reverted earlier change to allow some speculative operations to be performed 997 without holding the lock, as it introduced a race condition in some 998 multithreaded scenarios. 999* Fixed a bug where the second buffer in an array of two buffers may be ignored 1000 if the first buffer is empty. 1001 1002[heading Asio 1.6.1 / Boost 1.48] 1003 1004* Implemented various performance improvements, including: 1005 * Using thread-local operation queues in single-threaded use cases (i.e. when 1006 `concurrency_hint` is 1) to eliminate a lock/unlock pair. 1007 * Allowing some `epoll_reactor` speculative operations to be performed 1008 without holding the lock. 1009 * Improving locality of reference by performing an `epoll_reactor`'s I/O 1010 operation immediately before the corresponding handler is called. This also 1011 improves scalability across CPUs when multiple threads are running the 1012 `io_service`. 1013 * Specialising asynchronous read and write operations for buffer sequences 1014 that are arrays (`boost::array` or `std::array`) of exactly two buffers. 1015* Fixed a compile error in the regex overload of `async_read_until` 1016 ([@https://svn.boost.org/trac/boost/ticket/5688 #5688]). 1017* Fixed a Windows-specific compile error by explicitly specifying the 1018 `signal()` function from the global namespace 1019 ([@https://svn.boost.org/trac/boost/ticket/5722 #5722]). 1020* Changed the `deadline_timer` implementation so that it does not read the 1021 clock unless the timer heap is non-empty. 1022* Changed the SSL stream's buffers' sizes so that they are large enough to hold 1023 a complete TLS record ([@https://svn.boost.org/trac/boost/ticket/5854 #5854]). 1024* Fixed the behaviour of the synchronous `null_buffers` operations so that they 1025 obey the user's non-blocking setting 1026 ([@https://svn.boost.org/trac/boost/ticket/5756 #5756]). 1027* Changed to set the size of the select `fd_set` at runtime when using Windows. 1028* Disabled an MSVC warning due to const qualifier being applied to function type. 1029* Fixed a crash that occurs when using the Intel C++ compiler 1030 ([@https://svn.boost.org/trac/boost/ticket/5763 #5763]). 1031* Changed the initialisation of the OpenSSL library so that it supports all 1032 available algorithms. 1033* Fixed the SSL error mapping used when the session is gracefully shut down. 1034* Added some latency test programs. 1035* Clarified that a read operation ends when the buffer is full 1036 ([@https://svn.boost.org/trac/boost/ticket/5999 #5999]). 1037* Fixed an exception safety issue in `epoll_reactor` initialisation 1038 ([@https://svn.boost.org/trac/boost/ticket/6006 #6006]). 1039* Made the number of strand implementations configurable by defining 1040 `BOOST_ASIO_STRAND_IMPLEMENTATIONS` to the desired number. 1041* Added support for a new `BOOST_ASIO_ENABLE_SEQUENTIAL_STRAND_ALLOCATION` flag 1042 which switches the allocation of strand implementations to use a round-robin 1043 approach rather than hashing. 1044* Fixed potential strand starvation issue that can occur when `strand.post()` 1045 is used. 1046 1047[heading Asio 1.6.0 / Boost 1.47] 1048 1049* Added support for signal handling, using a new class called `signal_set`. 1050 Programs may add one or more signals to the set, and then perform an 1051 `async_wait()` operation. The specified handler will be called when one of 1052 the signals occurs. The same signal number may be registered with multiple 1053 `signal_set` objects, however the signal number must be used only with Asio. 1054 Addresses [@https://svn.boost.org/trac/boost/ticket/2879 #2879]. 1055* Added handler tracking, a new debugging aid. When enabled by defining 1056 `BOOST_ASIO_ENABLE_HANDLER_TRACKING`, Asio writes debugging output to the 1057 standard error stream. The output records asynchronous operations and the 1058 relationships between their handlers. It may be post-processed using the 1059 included [^handlerviz.pl] tool to create a visual representation of the 1060 handlers (requires GraphViz). 1061* Added support for timeouts on socket iostreams, such as `ip::tcp::iostream`. 1062 A timeout is set by calling `expires_at()` or `expires_from_now()` to 1063 establish a deadline. Any socket operations which occur past the deadline 1064 will put the iostream into a bad state. 1065* Added a new `error()` member function to socket iostreams, for retrieving the 1066 error code from the most recent system call. 1067* Added a new `basic_deadline_timer::cancel_one()` function. This function lets 1068 you cancel a single waiting handler on a timer. Handlers are cancelled in 1069 FIFO order. 1070* Added a new `transfer_exactly()` completion condition. This can be used to 1071 send or receive a specified number of bytes even if the total size of the 1072 buffer (or buffer sequence) is larger. 1073* Added new free functions `connect()` and `async_connect()`. These operations 1074 try each endpoint in a list until the socket is successfully connected, and 1075 are useful for creating TCP clients that work with both IPv4 and IPv6. 1076* Extended the `buffer_size()` function so that it works for buffer sequences 1077 in addition to individual buffers. 1078* Added a new `buffer_copy()` function that can be used to copy the raw bytes 1079 between individual buffers and buffer sequences. 1080* Added new non-throwing overloads of `read()`, `read_at()`, `write()` and 1081 `write_at()` that do not require a completion condition. 1082* Added friendlier compiler errors for when a completion handler does not meet 1083 the necessary type requirements. When C++0x is available (currently supported 1084 for [^g++] 4.5 or later, and MSVC 10), `static_assert` is also used to 1085 generate an informative error message. This checking may be disabled by 1086 defining `BOOST_ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS`. 1087* Added a new, completely rewritten SSL implementation. The new implementation 1088 compiles faster, shows substantially improved performance, and supports 1089 custom memory allocation and handler invocation. It includes new API features 1090 such as certificate verification callbacks and has improved error reporting. 1091 The new implementation is source-compatible with the old for most uses. 1092 However, if necessary, the old implementation may still be used by defining 1093 `BOOST_ASIO_ENABLE_OLD_SSL`. 1094 Addresses [@https://svn.boost.org/trac/boost/ticket/3702 #3702], 1095 [@https://svn.boost.org/trac/boost/ticket/3958 #3958]. 1096* Changed the separate compilation support such that, to use Asio's SSL 1097 capabilities, you should also include `boost/asio/ssl/impl/src.hpp` in one 1098 source file in your program. 1099* Changed the SSL implementation to support build environments where SSL v2 is 1100 explicitly disabled ([@https://svn.boost.org/trac/boost/ticket/5453 #5453]). 1101* Made the `is_loopback()`, `is_unspecified()` and `is_multicast()` functions 1102 consistently available across the `ip::address`, `ip::address_v4` and 1103 `ip::address_v6` classes 1104 ([@https://svn.boost.org/trac/boost/ticket/3939 #3939]). 1105* Added new `non_blocking()` functions for managing the non-blocking behaviour 1106 of a socket or descriptor. The `io_control()` commands named `non_blocking_io` 1107 are now deprecated in favour of these new functions. 1108* Added new `native_non_blocking()` functions for managing the non-blocking 1109 mode of the underlying socket or descriptor. These functions are intended to 1110 allow the encapsulation of arbitrary non-blocking system calls as 1111 asynchronous operations, in a way that is transparent to the user of the 1112 socket object. The functions have no effect on the behaviour of the 1113 synchronous operations of the socket or descriptor. 1114* Added the `io_control()` member function for socket acceptors 1115 ([@https://svn.boost.org/trac/boost/ticket/3297 #3297]). 1116* Added a `release()` member function to posix descriptors. This function 1117 releases ownership of the underlying native descriptor to the caller. 1118 Addresses [@https://svn.boost.org/trac/boost/ticket/3900 #3900]. 1119* Added support for sequenced packet sockets (`SOCK_SEQPACKET`). 1120* Added a new `io_service::stopped()` function that can be used to determine 1121 whether the `io_service` has stopped (i.e. a `reset()` call is needed prior 1122 to any further calls to `run()`, `run_one()`, `poll()` or `poll_one()`). 1123* For consistency with the C++0x standard library, deprecated the `native_type` 1124 typedefs in favour of `native_handle_type`, and the `native()` member 1125 functions in favour of `native_handle()`. 1126* Added support for C++0x move construction and assignment to sockets, serial 1127 ports, POSIX descriptors and Windows handles. 1128* Reduced the copying of handler function objects. 1129* Added support for C++0x move construction to further reduce (and in some 1130 cases eliminate) copying of handler objects. 1131* Added support for the `fork()` system call. Programs that use `fork()` must 1132 call `io_service.notify_fork()` at the appropriate times. Two new examples 1133 have been added showing how to use this feature. Addresses 1134 [@https://svn.boost.org/trac/boost/ticket/3238 #3238], 1135 [@https://svn.boost.org/trac/boost/ticket/4162 #4162]. 1136* Cleaned up the handling of errors reported by the `close()` system call. In 1137 particular, assume that most operating systems won't have `close()` fail with 1138 `EWOULDBLOCK`, but if it does then set the blocking mode and restart the call. 1139 If any other error occurs, assume the descriptor is closed. Addresses 1140 [@https://svn.boost.org/trac/boost/ticket/3307 #3307]. 1141* Added new `asio::buffer()` overloads for `std::array`, when available. 1142* Changed the implementation to use the C++0x standard library templates 1143 `array`, `shared_ptr`, `weak_ptr` and `atomic` when they are available, 1144 rather than the Boost equivalents. 1145* Use C++0x variadic templates when available, rather than generating function 1146 overloads using Boost.Preprocessor. 1147* Changed exception reporting to include the function name in exception `what()` 1148 messages. 1149* Fixed insufficient initialisers warning with MinGW. 1150* Changed the `shutdown_service()` member functions to be private. 1151* Added archetypes for testing socket option functions. 1152* Changed the Boost.Asio examples so that they don't use Boost.Thread's 1153 convenience header. Use the header file that is specifically for the 1154 boost::thread class instead. 1155* Removed the dependency on OS-provided macros for the well-known IPv4 and IPv6 1156 addresses. This should eliminate annoying "missing braces around initializer" 1157 warnings ([@https://svn.boost.org/trac/boost/ticket/3741 #3741]). 1158* Reduced the size of `ip::basic_endpoint<>` objects (such as 1159 `ip::tcp::endpoint` and `ip::udp::endpoint`). 1160* Changed the reactor backends to assume that any descriptors or sockets added 1161 using `assign()` may have been `dup()`-ed, and so require explicit 1162 deregistration from the reactor 1163 ([@https://svn.boost.org/trac/boost/ticket/4971 #4971]). 1164* Removed the deprecated member functions named `io_service()`. The 1165 `get_io_service()` member functions should be used instead. 1166* Removed the deprecated typedefs `resolver_query` and `resolver_iterator` from 1167 the `ip::tcp`, `ip::udp` and `ip::icmp` classes. 1168* Modified the `buffers_iterator<>` and `ip::basic_resolver_iterator` classes 1169 so that the value_type typedefs are non-const byte types. 1170* Fixed warnings reported by g++'s [^-Wshadow] compiler option 1171 ([@https://svn.boost.org/trac/boost/ticket/3905 #3905]). 1172* Added an explicit cast to convert the `FIONBIO` constant to int, to suppress 1173 a compiler warning on some platforms 1174 ([@https://svn.boost.org/trac/boost/ticket/5128 #5128]). 1175* Changed most examples to treat a failure by an accept operation as non-fatal 1176 ([@https://svn.boost.org/trac/boost/ticket/5124 #5124]). 1177* Fixed an error in the [^tick_count_timer] example by making the duration type 1178 signed. Previously, a wait on an already-passed deadline would not return for 1179 a very long time ([@https://svn.boost.org/trac/boost/ticket/5418 #5418]). 1180 1181[heading Asio 1.4.9 / Boost 1.46.1] 1182 1183* `EV_ONESHOT` seems to cause problems on some versions of Mac OS X, with the 1184 `io_service` destructor getting stuck inside the `close()` system call. 1185 Changed the kqueue backend to use `EV_CLEAR` instead 1186 ([@https://svn.boost.org/trac/boost/ticket/5021 #5021]). 1187* Fixed compile failures with some versions of [^g++] due to the use of 1188 anonymous enums ([@https://svn.boost.org/trac/boost/ticket/4883 #4883]). 1189* Fixed a bug on kqueue-based platforms, where some system calls that 1190 repeatedly fail with `EWOULDBLOCK` are not correctly re-registered with 1191 kqueue. 1192* Changed `asio::streambuf` to ensure that its internal pointers are updated 1193 correctly after the data has been modified using `std::streambuf` member 1194 functions. 1195* Fixed a bug that prevented the linger socket option from working on platforms 1196 other than Windows. 1197 1198[heading Asio 1.4.8 / Boost 1.46] 1199 1200* Fixed an integer overflow problem that occurs when 1201 `ip::address_v4::broadcast()` is used on 64-bit platforms. 1202* Fixed a problem on older Linux kernels (where epoll is used without timerfd 1203 support) that prevents timely delivery of deadline_timer handlers, after the 1204 program has been running for some time 1205 ([@https://svn.boost.org/trac/boost/ticket/5045 #5045]). 1206 1207[heading Asio 1.4.7 / Boost 1.45] 1208 1209* Fixed a problem on kqueue-based platforms where a `deadline_timer` may 1210 never fire if the `io_service` is running in a background thread 1211 ([@https://svn.boost.org/trac/boost/ticket/4568 #4568]). 1212* Fixed a const-correctness issue that prevented valid uses of 1213 `has_service<>` from compiling 1214 ([@https://svn.boost.org/trac/boost/ticket/4638 #4638]). 1215* Fixed MinGW cross-compilation 1216 ([@https://svn.boost.org/trac/boost/ticket/4491 #4491]). 1217* Removed dependency on deprecated Boost.System functions 1218 ([@https://svn.boost.org/trac/boost/ticket/4672 #4672]). 1219* Ensured `close()`\/`closesocket()` failures are correctly propagated 1220 ([@https://svn.boost.org/trac/boost/ticket/4573 #4573]). 1221* Added a check for errors returned by `InitializeCriticalSectionAndSpinCount` 1222 ([@https://svn.boost.org/trac/boost/ticket/4574 #4574]). 1223* Added support for hardware flow control on QNX 1224 ([@https://svn.boost.org/trac/boost/ticket/4625 #4625]). 1225* Always use `pselect()` on HP-UX, if it is available 1226 ([@https://svn.boost.org/trac/boost/ticket/4578 #4578]). 1227* Ensured handler arguments are passed as lvalues 1228 ([@https://svn.boost.org/trac/boost/ticket/4744 #4744]). 1229* Fixed Windows build when thread support is disabled 1230 ([@https://svn.boost.org/trac/boost/ticket/4680 #4680]). 1231* Fixed a Windows-specific problem where `deadline_timer` objects with expiry 1232 times set more than 5 minutes in the future may never expire 1233 ([@https://svn.boost.org/trac/boost/ticket/4745 #4745]). 1234* Fixed the `resolver` backend on BSD platforms so that an empty service name 1235 resolves to port number `0`, as per the documentation 1236 ([@https://svn.boost.org/trac/boost/ticket/4690 #4690]). 1237* Fixed read operations so that they do not accept buffer sequences of type 1238 `const_buffers_1` ([@https://svn.boost.org/trac/boost/ticket/4746 #4746]). 1239* Redefined `Protocol` and `id` to avoid clashing with Objective-C++ keywords 1240 ([@https://svn.boost.org/trac/boost/ticket/4191 #4191]). 1241* Fixed a `vector` reallocation performance issue that can occur when there are 1242 many active `deadline_timer` objects 1243 ([@https://svn.boost.org/trac/boost/ticket/4780 #4780]). 1244* Fixed the kqueue backend so that it compiles on NetBSD 1245 ([@https://svn.boost.org/trac/boost/ticket/4662 #4662]). 1246* Fixed the socket `io_control()` implementation on 64-bit Mac OS X and BSD 1247 platforms ([@https://svn.boost.org/trac/boost/ticket/4782 #4782]). 1248* Fixed a Windows-specific problem where failures from `accept()` are 1249 incorrectly treated as successes 1250 ([@https://svn.boost.org/trac/boost/ticket/4859 #4859]). 1251* Deprecated the separate compilation header `<boost/asio/impl/src.cpp>` in 1252 favour of `<boost/asio/impl/src.hpp>` 1253 ([@https://svn.boost.org/trac/boost/ticket/4560 #4560]). 1254 1255[heading Asio 1.4.6 / Boost 1.44] 1256 1257* Reduced compile times. (Note that some programs may need to add additional 1258 `#include`s, e.g. if the program uses `boost::array` but does not explicitly 1259 include `<boost/array.hpp>`.) 1260* Reduced the size of generated code. 1261* Refactored `deadline_timer` implementation to improve performance. 1262* Improved multiprocessor scalability on Windows by using a dedicated hidden 1263 thread to wait for timers. 1264* Improved performance of `asio::streambuf` with `async_read()` and 1265 `async_read_until()`. These read operations now use the existing capacity of 1266 the `streambuf` when reading, rather than limiting the read to 512 bytes. 1267* Added optional separate compilation. To enable, add 1268 `#include <boost/asio/impl/src.cpp>` to one source file in a program, then 1269 build the program with `BOOST_ASIO_SEPARATE_COMPILATION` defined in the 1270 project\/compiler settings. Alternatively, `BOOST_ASIO_DYN_LINK` may be 1271 defined to build a separately-compiled Asio as part of a shared library. 1272* Added new macro `BOOST_ASIO_DISABLE_FENCED_BLOCK` to permit the disabling of 1273 memory fences around completion handlers, even if thread support is enabled. 1274* Reworked timeout examples to better illustrate typical use cases. 1275* Ensured that handler arguments are passed as `const` types. 1276* Fixed incorrect parameter order in `null_buffers` variant of `async_send_to` 1277 ([@https://svn.boost.org/trac/boost/ticket/4170 #4170]). 1278* Ensured `unsigned char` is used with `isdigit` in `getaddrinfo` emulation 1279 ([@https://svn.boost.org/trac/boost/ticket/4201 #4201]). 1280* Fixed handling of very small but non-zero timeouts 1281 ([@https://svn.boost.org/trac/boost/ticket/4205 #4205]). 1282* Fixed crash that occurred when an empty buffer sequence was passed to a 1283 composed read or write operation. 1284* Added missing `operator+` overload in `buffers_iterator` 1285 ([@https://svn.boost.org/trac/boost/ticket/4382 #4382]). 1286* Implemented cancellation of `null_buffers` operations on Windows. 1287 1288[heading Asio 1.4.5 / Boost 1.43] 1289 1290* Improved performance. 1291* Reduced compile times. 1292* Reduced the size of generated code. 1293* Extended the guarantee that background threads don't call user code to all 1294 asynchronous operations 1295 ([@https://svn.boost.org/trac/boost/ticket/3923 #3923]). 1296* Changed to use edge-triggered epoll on Linux. 1297* Changed to use `timerfd` for dispatching timers on Linux, when available. 1298* Changed to use one-shot notifications with kqueue on Mac OS X and BSD 1299 platforms. 1300* Added a bitmask type `ip::resolver_query_base::flags` as per the TR2 proposal. 1301 This type prevents implicit conversion from `int` to `flags`, allowing the 1302 compiler to catch cases where users incorrectly pass a numeric port number as 1303 the service name. 1304* Added `#define NOMINMAX` for all Windows compilers. Users can define 1305 `BOOST_ASIO_NO_NOMINMAX` to suppress this definition 1306 ([@https://svn.boost.org/trac/boost/ticket/3901 #3901]). 1307* Fixed a bug where 0-byte asynchronous reads were incorrectly passing an 1308 `error::eof` result to the completion handler 1309 ([@https://svn.boost.org/trac/boost/ticket/4023 #4023]). 1310* Changed the `io_control()` member functions to always call `ioctl` on the 1311 underlying descriptor when modifying blocking mode 1312 ([@https://svn.boost.org/trac/boost/ticket/3307 #3307]). 1313* Changed the resolver implementation to longer require the typedefs 1314 `InternetProtocol::resolver_query` and `InternetProtocol::resolver_iterator`, 1315 as neither typedef is part of the documented `InternetProtocol` requirements. 1316 The corresponding typedefs in the `ip::tcp`, `ip::udp` and `ip::icmp` classes 1317 have been deprecated. 1318* Fixed out-of-band handling for reactors not based on `select()`. 1319* Added new `BOOST_ASIO_DISABLE_THREADS` macro that allows Asio's threading 1320 support to be independently disabled. 1321* Minor documentation improvements. 1322 1323[heading Asio 1.4.4 / Boost 1.42] 1324 1325* Added a new HTTP Server 4 example illustrating the use of stackless coroutines 1326 with Asio. 1327* Changed handler allocation and invocation to use `boost::addressof` to get the 1328 address of handler objects, rather than applying `operator&` directly 1329 ([@https://svn.boost.org/trac/boost/ticket/2977 #2977]). 1330* Restricted MSVC buffer debugging workaround to 2008, as it causes a crash with 1331 2010 beta 2 ([@https://svn.boost.org/trac/boost/ticket/3796 #3796], 1332 [@https://svn.boost.org/trac/boost/ticket/3822 #3822]). 1333* Fixed a problem with the lifetime of handler memory, where Windows needs the 1334 `OVERLAPPED` structure to be valid until both the initiating function call 1335 has returned and the completion packet has been delivered. 1336* Don't block signals while performing system calls, but instead restart the 1337 calls if they are interrupted. 1338* Documented the guarantee made by strand objects with respect to order of 1339 handler invocation. 1340* Changed strands to use a pool of implementations, to make copying of strands 1341 cheaper. 1342* Ensured that kqueue support is enabled for BSD platforms 1343 ([@https://svn.boost.org/trac/boost/ticket/3626 #3626]). 1344* Added a `boost_` prefix to the `extern "C"` thread entry point function 1345 ([@https://svn.boost.org/trac/boost/ticket/3809 #3809]). 1346* In `getaddrinfo` emulation, only check the socket type (`SOCK_STREAM` or 1347 `SOCK_DGRAM`) if a service name has been specified. This should allow the 1348 emulation to work with raw sockets. 1349* Added a workaround for some broken Windows firewalls that make a socket 1350 appear bound to 0.0.0.0 when it is in fact bound to 127.0.0.1. 1351* Applied a fix for reported excessive CPU usage under Solaris 1352 ([@https://svn.boost.org/trac/boost/ticket/3670 #3670]). 1353* Added some support for platforms that use older compilers such as g++ 2.95 1354 ([@https://svn.boost.org/trac/boost/ticket/3743 #3743]). 1355 1356[heading Asio 1.4.3 / Boost 1.40] 1357 1358* Added a new ping example to illustrate the use of ICMP sockets. 1359* Changed the `buffered*_stream<>` templates to treat 0-byte reads and writes as 1360 no-ops, to comply with the documented type requirements for `SyncReadStream`, 1361 `AsyncReadStream`, `SyncWriteStream` and `AsyncWriteStream`. 1362* Changed some instances of the `throw` keyword to `boost::throw_exception()` to 1363 allow Asio to be used when exception support is disabled. Note that the SSL 1364 wrappers still require exception support 1365 ([@https://svn.boost.org/trac/boost/ticket/2754 #2754]). 1366* Made Asio compatible with the OpenSSL 1.0 beta 1367 ([@https://svn.boost.org/trac/boost/ticket/3256 #3256]). 1368* Eliminated a redundant system call in the Solaris [^/dev/poll] backend. 1369* Fixed a bug in resizing of the bucket array in the internal hash maps 1370 ([@https://svn.boost.org/trac/boost/ticket/3095 #3095]). 1371* Ensured correct propagation of the error code when a synchronous accept fails 1372 ([@https://svn.boost.org/trac/boost/ticket/3216 #3216]). 1373* Ensured correct propagation of the error code when a synchronous read or 1374 write on a Windows HANDLE fails. 1375* Fixed failures reported when `_GLIBCXX_DEBUG` is defined 1376 ([@https://svn.boost.org/trac/boost/ticket/3098 #3098]). 1377* Fixed custom memory allocation support for timers 1378 ([@https://svn.boost.org/trac/boost/ticket/3107 #3107]). 1379* Tidied up various warnings reported by g++ 1380 ([@https://svn.boost.org/trac/boost/ticket/1341 #1341], 1381 [@https://svn.boost.org/trac/boost/ticket/2618 #2618]). 1382* Various documentation improvements, including more obvious hyperlinks to 1383 function overloads, header file information, examples for the handler type 1384 requirements, and adding enum values to the index 1385 ([@https://svn.boost.org/trac/boost/ticket/3157 #3157], 1386 [@https://svn.boost.org/trac/boost/ticket/2620 #2620]). 1387 1388[heading Asio 1.4.2 / Boost 1.39] 1389 1390* Implement automatic resizing of the bucket array in the internal hash maps. 1391 This is to improve performance for very large numbers of asynchronous 1392 operations and also to reduce memory usage for very small numbers. A new 1393 macro `BOOST_ASIO_HASH_MAP_BUCKETS` may be used to tweak the sizes used for 1394 the bucket arrays. (N.B. this feature introduced a bug which was fixed in 1395 Asio 1.4.3 / Boost 1.40.) 1396* Add performance optimisation for the Windows IOCP backend for when no timers 1397 are used. 1398* Prevent locale settings from affecting formatting of TCP and UDP endpoints 1399 ([@https://svn.boost.org/trac/boost/ticket/2682 #2682]). 1400* Fix a memory leak that occurred when an asynchronous SSL operation's 1401 completion handler threw an exception 1402 ([@https://svn.boost.org/trac/boost/ticket/2910 #2910]). 1403* Fix the implementation of `io_control()` so that it adheres to the 1404 documented type requirements for IoControlCommand 1405 ([@https://svn.boost.org/trac/boost/ticket/2820 #2820]). 1406* Fix incompatibility between Asio and ncurses.h 1407 ([@https://svn.boost.org/trac/boost/ticket/2156 #2156]). 1408* On Windows, specifically handle the case when an overlapped `ReadFile` call 1409 fails with `ERROR_MORE_DATA`. This enables a hack where a 1410 `windows::stream_handle` can be used with a message-oriented named pipe 1411 ([@https://svn.boost.org/trac/boost/ticket/2936 #2936]). 1412* Fix system call wrappers to always clear the error on success, as POSIX 1413 allows successful system calls to modify errno 1414 ([@https://svn.boost.org/trac/boost/ticket/2953 #2953]). 1415* Don't include termios.h if `BOOST_ASIO_DISABLE_SERIAL_PORT` is defined 1416 ([@https://svn.boost.org/trac/boost/ticket/2917 #2917]). 1417* Cleaned up some more MSVC level 4 warnings 1418 ([@https://svn.boost.org/trac/boost/ticket/2828 #2828]). 1419* Various documentation fixes 1420 ([@https://svn.boost.org/trac/boost/ticket/2871 #2871]). 1421 1422[heading Asio 1.4.1 / Boost 1.38] 1423 1424* Improved compatibility with some Windows firewall software. 1425* Ensured arguments to `windows::overlapped_ptr::complete()` are correctly 1426 passed to the completion handler 1427 ([@https://svn.boost.org/trac/boost/ticket/2614 #2614]). 1428* Fixed a link problem and multicast failure on QNX 1429 ([@https://svn.boost.org/trac/boost/ticket/2504 #2504], 1430 [@https://svn.boost.org/trac/boost/ticket/2530 #2530]). 1431* Fixed a compile error in SSL support on MinGW / g++ 3.4.5. 1432* Drop back to using a pipe for notification if eventfd is not available at 1433 runtime on Linux ([@https://svn.boost.org/trac/boost/ticket/2683 #2683]). 1434* Various minor bug and documentation fixes 1435 ([@https://svn.boost.org/trac/boost/ticket/2534 #2534], 1436 [@https://svn.boost.org/trac/boost/ticket/2541 #2541], 1437 [@https://svn.boost.org/trac/boost/ticket/2607 #2607], 1438 [@https://svn.boost.org/trac/boost/ticket/2617 #2617], 1439 [@https://svn.boost.org/trac/boost/ticket/2619 #2619]). 1440 1441[heading Asio 1.4.0 / Boost 1.37] 1442 1443* Enhanced CompletionCondition concept with the signature 1444 `size_t CompletionCondition(error_code ec, size_t total)`, where the return 1445 value indicates the maximum number of bytes to be transferred on the next 1446 read or write operation. (The old CompletionCondition signature is still 1447 supported for backwards compatibility). 1448* New windows::overlapped_ptr class to allow arbitrary overlapped I/O 1449 functions (such as TransmitFile) to be used with Asio. 1450* On recent versions of Linux, an eventfd descriptor is now used (rather than 1451 a pipe) to interrupt a blocked select/epoll reactor. 1452* Added const overloads of lowest_layer(). 1453* Synchronous read, write, accept and connect operations are now thread safe 1454 (meaning that it is now permitted to perform concurrent synchronous 1455 operations on an individual socket, if supported by the OS). 1456* Reactor-based io_service implementations now use lazy initialisation to 1457 reduce the memory usage of an io_service object used only as a message 1458 queue. 1459 1460[heading Asio 1.2.0 / Boost 1.36] 1461 1462* Added support for serial ports. 1463* Added support for UNIX domain sockets. 1464* Added support for raw sockets and ICMP. 1465* Added wrappers for POSIX stream-oriented file descriptors (excluding regular 1466 files). 1467* Added wrappers for Windows stream-oriented `HANDLE`s such as named pipes 1468 (requires `HANDLE`s that work with I/O completion ports). 1469* Added wrappers for Windows random-access `HANDLE`s such as files (requires 1470 `HANDLE`s that work with I/O completion ports). 1471* Added support for reactor-style operations (i.e. they report readiness but 1472 perform no I/O) using a new `null_buffers` type. 1473* Added an iterator type for bytewise traversal of buffer sequences. 1474* Added new `read_until()` and `async_read_until()` overloads that take a 1475 user-defined function object for locating message boundaries. 1476* Added an experimental two-lock queue (enabled by defining 1477 `BOOST_ASIO_ENABLE_TWO_LOCK_QUEUE`) that may provide better `io_service` 1478 scalability across many processors. 1479* Various fixes, performance improvements, and more complete coverage of the 1480 custom memory allocation support. 1481 1482[heading Asio 1.0.0 / Boost 1.35] 1483 1484First release of Asio as part of Boost. 1485 1486[endsect] 1487
