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1 // Test whether no race conditions are reported on std::thread. Note: since
2 // the implementation of std::thread uses the shared pointer implementation,
3 // that implementation has to be annotated in order to avoid false positives.
4 // See also http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html for more
5 // information.
6 
7 #include "../../drd/drd.h"
8 #define _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(addr) \
9   ANNOTATE_HAPPENS_BEFORE(addr)
10 #define _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(addr) \
11   ANNOTATE_HAPPENS_AFTER(addr)
12 
13 #include <iostream>
14 #include <thread>
15 #include <unistd.h>
16 
17 static int i;
18 
main(int argc,char ** argv)19 int main(int argc, char** argv)
20 {
21   std::thread t1( []() { sleep(1); i = 1; } );
22   std::thread t2( []() { i = 2; } );
23   t2.join();
24   t1.join();
25   std::cerr << "Done.\n";
26   return 0;
27 }
28 
29 #if defined(__GNUC__) && __GNUC__ -0 < 6
30 //
31 // From libstdc++-v3/src/c++11/thread.cc
32 //
33 
_v_execute_native_thread_routine(void * __p)34 extern "C" void* _v_execute_native_thread_routine(void* __p)
35 {
36   std::thread::_Impl_base* __t = static_cast<std::thread::_Impl_base*>(__p);
37   std::thread::__shared_base_type __local;
38   __local.swap(__t->_M_this_ptr);
39 
40   __try {
41     __t->_M_run();
42   } __catch(const __cxxabiv1::__forced_unwind&) {
43     __throw_exception_again;
44   } __catch(...) {
45     std::terminate();
46   }
47 
48   return 0;
49 }
50 
51 #include <system_error>
52 
53 namespace std
54 {
_M_start_thread(__shared_base_type __b)55   void thread::_M_start_thread(__shared_base_type __b)
56   {
57     if (!__gthread_active_p())
58 #if __EXCEPTIONS
59       throw system_error(make_error_code(errc::operation_not_permitted),
60                          "Enable multithreading to use std::thread");
61 #else
62       __throw_system_error(int(errc::operation_not_permitted));
63 #endif
64 
65     __b->_M_this_ptr = __b;
66     int __e = __gthread_create(&_M_id._M_thread, _v_execute_native_thread_routine,
67                                __b.get());
68     if (__e) {
69       __b->_M_this_ptr.reset();
70       __throw_system_error(__e);
71     }
72   }
73 }
74 #endif
75