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87 </script> 88 89 </div> 90 91 <main class="container"> 92 <div class="magick-template"> 93<div class="magick-header"> 94<p class="text-center"><a href="memory.html#AcquireCriticalMemory">AcquireCriticalMemory</a> • <a href="memory.html#AcquireAlignedMemory">AcquireAlignedMemory</a> • <a href="memory.html#AcquireMagickMemory">AcquireMagickMemory</a> • <a href="memory.html#AcquireCriticalMemory">AcquireCriticalMemory</a> • <a href="memory.html#AcquireQuantumMemory">AcquireQuantumMemory</a> • <a href="memory.html#AcquireVirtualMemory">AcquireVirtualMemory</a> • <a href="memory.html#CopyMagickMemory">CopyMagickMemory</a> • <a href="memory.html#GetMagickMemoryMethods">GetMagickMemoryMethods</a> • <a href="memory.html#GetVirtualMemoryBlob">GetVirtualMemoryBlob</a> • <a href="memory.html#RelinquishAlignedMemory">RelinquishAlignedMemory</a> • <a href="memory.html#RelinquishMagickMemory">RelinquishMagickMemory</a> • <a href="memory.html#RelinquishVirtualMemory">RelinquishVirtualMemory</a> • <a href="memory.html#ResetMagickMemory">ResetMagickMemory</a> • <a href="memory.html#ResizeMagickMemory">ResizeMagickMemory</a> • <a href="memory.html#ResizeQuantumMemory">ResizeQuantumMemory</a> • <a href="memory.html#SetMagickAlignedMemoryMethods">SetMagickAlignedMemoryMethods</a> • <a href="memory.html#SetMagickMemoryMethods">SetMagickMemoryMethods</a></p> 95 96<h2><a href="../../api/MagickCore/memory_8c.html" id="AcquireCriticalMemory">AcquireCriticalMemory</a></h2> 97 98<p>AcquireCriticalMemory(): allocate a small memory request with AcquireMagickMemory(), however, on fail throw a fatal exception and exit. Free the memory reserve with RelinquishMagickMemory(). AcquireAlignedMemory(): allocate a small memory request that is aligned on a cache line. On fail, return NULL for possible recovery. Free the memory reserve with RelinquishMagickMemory(). AcquireMagickMemory()/ResizeMagickMemory(): allocate a small to medium memory request, typically with malloc()/realloc(). On fail, return NULL for possible recovery. Free the memory reserve with RelinquishMagickMemory(). AcquireQuantumMemory()/ResizeQuantumMemory(): allocate a small to medium memory request. This is a secure memory allocator as it accepts two parameters, count and quantum, to ensure the request does not overflow. It also check to ensure the request does not exceed the maximum memory per the security policy. Free the memory reserve with RelinquishMagickMemory(). AcquireVirtualMemory(): allocate a large memory request either in heap, memory-mapped, or memory-mapped on disk depending on whether heap allocation fails or if the request exceeds the maximum memory policy. Free the memory reserve with RelinquishVirtualMemory(). ResetMagickMemory(): fills the bytes of the memory area with a constant byte.</p> 99 100<p>In addition, we provide hooks for your own memory constructor/destructors.</p> 101<dt>utilize our internal custom allocator as follows</dt> 102<p>Segregate our memory requirements from any program that calls our API. This should help reduce the risk of others changing our program state or causing memory corruption.</p> 103 104<p>Our custom memory allocation manager implements a best-fit allocation policy using segregated free lists. It uses a linear distribution of size classes for lower sizes and a power of two distribution of size classes at higher sizes. It is based on the paper, "Fast Memory Allocation using Lazy Fits." written by Yoo C. Chung.</p> 105 106<p>By default, C's standard library is used (e.g. malloc); use the custom memory allocator by defining MAGICKCORE_ANONYMOUS_MEMORY_SUPPORT to allocate memory with private anonymous mapping rather than from the heap.</p> 107 108<h2><a href="../../api/MagickCore/memory_8c.html" id="AcquireAlignedMemory">AcquireAlignedMemory</a></h2> 109 110<p>AcquireAlignedMemory() returns a pointer to a block of memory whose size is at least (count*quantum) bytes, and whose address is aligned on a cache line.</p> 111 112<p>The format of the AcquireAlignedMemory method is:</p> 113 114<pre class="text"> 115void *AcquireAlignedMemory(const size_t count,const size_t quantum) 116</pre> 117 118<p>A description of each parameter follows:</p> 119 120<dd> 121</dd> 122 123<dd> </dd> 124<dl class="dl-horizontal"> 125<dt>count</dt> 126<dd>the number of objects to allocate contiguously. </dd> 127 128<dd> </dd> 129<dt>quantum</dt> 130<dd>the size (in bytes) of each object. </dd> 131 132<dd> </dd> 133</dl> 134<h2><a href="../../api/MagickCore/memory_8c.html" id="AcquireMagickMemory">AcquireMagickMemory</a></h2> 135 136<p>AcquireMagickMemory() returns a pointer to a block of memory at least size bytes suitably aligned for any use.</p> 137 138<p>The format of the AcquireMagickMemory method is:</p> 139 140<pre class="text"> 141void *AcquireMagickMemory(const size_t size) 142</pre> 143 144<p>A description of each parameter follows:</p> 145 146<dd> 147</dd> 148 149<dd> </dd> 150<dl class="dl-horizontal"> 151<dt>size</dt> 152<dd>the size of the memory in bytes to allocate. </dd> 153 154<dd> </dd> 155</dl> 156<h2><a href="../../api/MagickCore/memory_8c.html" id="AcquireCriticalMemory">AcquireCriticalMemory</a></h2> 157 158<p>AcquireCriticalMemory() is just like AcquireMagickMemory(), throws a fatal exception if the memory cannot be acquired.</p> 159 160<p>That is, AcquireCriticalMemory() returns a pointer to a block of memory that is at least size bytes, and that is suitably aligned for any use; however, if this is not possible, it throws an exception and terminates the program as unceremoniously as possible.</p> 161 162<p>The format of the AcquireCriticalMemory method is:</p> 163 164<pre class="text"> 165void *AcquireCriticalMemory(const size_t size) 166</pre> 167 168<p>A description of each parameter follows:</p> 169 170<dd> 171</dd> 172 173<dd> </dd> 174<dl class="dl-horizontal"> 175<dt>size</dt> 176<dd>the size (in bytes) of the memory to allocate. </dd> 177 178<dd> </dd> 179</dl> 180<h2><a href="../../api/MagickCore/memory_8c.html" id="AcquireQuantumMemory">AcquireQuantumMemory</a></h2> 181 182<p>AcquireQuantumMemory() returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.</p> 183 184<p>The format of the AcquireQuantumMemory method is:</p> 185 186<pre class="text"> 187void *AcquireQuantumMemory(const size_t count,const size_t quantum) 188</pre> 189 190<p>A description of each parameter follows:</p> 191 192<dd> 193</dd> 194 195<dd> </dd> 196<dl class="dl-horizontal"> 197<dt>count</dt> 198<dd>the number of objects to allocate contiguously. </dd> 199 200<dd> </dd> 201<dt>quantum</dt> 202<dd>the size (in bytes) of each object. </dd> 203 204<dd> </dd> 205</dl> 206<h2><a href="../../api/MagickCore/memory_8c.html" id="AcquireVirtualMemory">AcquireVirtualMemory</a></h2> 207 208<p>AcquireVirtualMemory() allocates a pointer to a block of memory at least size bytes suitably aligned for any use. In addition to heap, it also supports memory-mapped and file-based memory-mapped memory requests.</p> 209 210<p>The format of the AcquireVirtualMemory method is:</p> 211 212<pre class="text"> 213MemoryInfo *AcquireVirtualMemory(const size_t count,const size_t quantum) 214</pre> 215 216<p>A description of each parameter follows:</p> 217 218<dd> 219</dd> 220 221<dd> </dd> 222<dl class="dl-horizontal"> 223<dt>count</dt> 224<dd>the number of objects to allocate contiguously. </dd> 225 226<dd> </dd> 227<dt>quantum</dt> 228<dd>the size (in bytes) of each object. </dd> 229 230<dd> </dd> 231</dl> 232<h2><a href="../../api/MagickCore/memory_8c.html" id="CopyMagickMemory">CopyMagickMemory</a></h2> 233 234<p>CopyMagickMemory() copies size bytes from memory area source to the destination. Copying between objects that overlap will take place correctly. It returns destination.</p> 235 236<p>The format of the CopyMagickMemory method is:</p> 237 238<pre class="text"> 239void *CopyMagickMemory(void *magick_restrict destination, 240 const void *magick_restrict source,const size_t size) 241</pre> 242 243<p>A description of each parameter follows:</p> 244 245<dd> 246</dd> 247 248<dd> </dd> 249<dl class="dl-horizontal"> 250<dt>destination</dt> 251<dd>the destination. </dd> 252 253<dd> </dd> 254<dt>source</dt> 255<dd>the source. </dd> 256 257<dd> </dd> 258<dt>size</dt> 259<dd>the size of the memory in bytes to allocate. </dd> 260 261<dd> </dd> 262</dl> 263<h2><a href="../../api/MagickCore/memory_8c.html" id="GetMagickMemoryMethods">GetMagickMemoryMethods</a></h2> 264 265<p>GetMagickMemoryMethods() gets the methods to acquire, resize, and destroy memory.</p> 266 267<p>The format of the GetMagickMemoryMethods() method is:</p> 268 269<pre class="text"> 270void GetMagickMemoryMethods(AcquireMemoryHandler *acquire_memory_handler, 271 ResizeMemoryHandler *resize_memory_handler, 272 DestroyMemoryHandler *destroy_memory_handler) 273</pre> 274 275<p>A description of each parameter follows:</p> 276 277<dd> 278</dd> 279 280<dd> </dd> 281<dl class="dl-horizontal"> 282<dt>acquire_memory_handler</dt> 283<dd>method to acquire memory (e.g. malloc). </dd> 284 285<dd> </dd> 286<dt>resize_memory_handler</dt> 287<dd>method to resize memory (e.g. realloc). </dd> 288 289<dd> </dd> 290<dt>destroy_memory_handler</dt> 291<dd>method to destroy memory (e.g. free). </dd> 292 293<dd> </dd> 294</dl> 295<h2><a href="../../api/MagickCore/memory_8c.html" id="GetVirtualMemoryBlob">GetVirtualMemoryBlob</a></h2> 296 297<p>GetVirtualMemoryBlob() returns the virtual memory blob associated with the specified MemoryInfo structure.</p> 298 299<p>The format of the GetVirtualMemoryBlob method is:</p> 300 301<pre class="text"> 302void *GetVirtualMemoryBlob(const MemoryInfo *memory_info) 303</pre> 304 305<p>A description of each parameter follows:</p> 306 307<dd> 308</dd> 309 310<dd> </dd> 311<dl class="dl-horizontal"> 312<dt>memory_info</dt> 313<dd>The MemoryInfo structure. </dd> 314</dl> 315<h2><a href="../../api/MagickCore/memory_8c.html" id="RelinquishAlignedMemory">RelinquishAlignedMemory</a></h2> 316 317<p>RelinquishAlignedMemory() frees memory acquired with AcquireAlignedMemory() or reuse.</p> 318 319<p>The format of the RelinquishAlignedMemory method is:</p> 320 321<pre class="text"> 322void *RelinquishAlignedMemory(void *memory) 323</pre> 324 325<p>A description of each parameter follows:</p> 326 327<dd> 328</dd> 329 330<dd> </dd> 331<dl class="dl-horizontal"> 332<dt>memory</dt> 333<dd>A pointer to a block of memory to free for reuse. </dd> 334 335<dd> </dd> 336</dl> 337<h2><a href="../../api/MagickCore/memory_8c.html" id="RelinquishMagickMemory">RelinquishMagickMemory</a></h2> 338 339<p>RelinquishMagickMemory() frees memory acquired with AcquireMagickMemory() or AcquireQuantumMemory() for reuse.</p> 340 341<p>The format of the RelinquishMagickMemory method is:</p> 342 343<pre class="text"> 344void *RelinquishMagickMemory(void *memory) 345</pre> 346 347<p>A description of each parameter follows:</p> 348 349<dd> 350</dd> 351 352<dd> </dd> 353<dl class="dl-horizontal"> 354<dt>memory</dt> 355<dd>A pointer to a block of memory to free for reuse. </dd> 356 357<dd> </dd> 358</dl> 359<h2><a href="../../api/MagickCore/memory_8c.html" id="RelinquishVirtualMemory">RelinquishVirtualMemory</a></h2> 360 361<p>RelinquishVirtualMemory() frees memory acquired with AcquireVirtualMemory().</p> 362 363<p>The format of the RelinquishVirtualMemory method is:</p> 364 365<pre class="text"> 366MemoryInfo *RelinquishVirtualMemory(MemoryInfo *memory_info) 367</pre> 368 369<p>A description of each parameter follows:</p> 370 371<dd> 372</dd> 373 374<dd> </dd> 375<dl class="dl-horizontal"> 376<dt>memory_info</dt> 377<dd>A pointer to a block of memory to free for reuse. </dd> 378 379<dd> </dd> 380</dl> 381<h2><a href="../../api/MagickCore/memory_8c.html" id="ResetMagickMemory">ResetMagickMemory</a></h2> 382 383<p>ResetMagickMemory() fills the first size bytes of the memory area pointed to by memory with the constant byte c.</p> 384 385<p>The format of the ResetMagickMemory method is:</p> 386 387<pre class="text"> 388void *ResetMagickMemory(void *memory,int byte,const size_t size) 389</pre> 390 391<p>A description of each parameter follows:</p> 392 393<dd> 394</dd> 395 396<dd> </dd> 397<dl class="dl-horizontal"> 398<dt>memory</dt> 399<dd>a pointer to a memory allocation. </dd> 400 401<dd> </dd> 402<dt>byte</dt> 403<dd>set the memory to this value. </dd> 404 405<dd> </dd> 406<dt>size</dt> 407<dd>size of the memory to reset. </dd> 408 409<dd> </dd> 410</dl> 411<h2><a href="../../api/MagickCore/memory_8c.html" id="ResizeMagickMemory">ResizeMagickMemory</a></h2> 412 413<p>ResizeMagickMemory() changes the size of the memory and returns a pointer to the (possibly moved) block. The contents will be unchanged up to the lesser of the new and old sizes.</p> 414 415<p>The format of the ResizeMagickMemory method is:</p> 416 417<pre class="text"> 418void *ResizeMagickMemory(void *memory,const size_t size) 419</pre> 420 421<p>A description of each parameter follows:</p> 422 423<dd> 424</dd> 425 426<dd> </dd> 427<dl class="dl-horizontal"> 428<dt>memory</dt> 429<dd>A pointer to a memory allocation. </dd> 430 431<dd> </dd> 432<dt>size</dt> 433<dd>the new size of the allocated memory. </dd> 434 435<dd> </dd> 436</dl> 437<h2><a href="../../api/MagickCore/memory_8c.html" id="ResizeQuantumMemory">ResizeQuantumMemory</a></h2> 438 439<p>ResizeQuantumMemory() changes the size of the memory and returns a pointer to the (possibly moved) block. The contents will be unchanged up to the lesser of the new and old sizes.</p> 440 441<p>The format of the ResizeQuantumMemory method is:</p> 442 443<pre class="text"> 444void *ResizeQuantumMemory(void *memory,const size_t count, 445 const size_t quantum) 446</pre> 447 448<p>A description of each parameter follows:</p> 449 450<dd> 451</dd> 452 453<dd> </dd> 454<dl class="dl-horizontal"> 455<dt>memory</dt> 456<dd>A pointer to a memory allocation. </dd> 457 458<dd> </dd> 459<dt>count</dt> 460<dd>the number of objects to allocate contiguously. </dd> 461 462<dd> </dd> 463<dt>quantum</dt> 464<dd>the size (in bytes) of each object. </dd> 465 466<dd> </dd> 467</dl> 468<h2><a href="../../api/MagickCore/memory_8c.html" id="SetMagickAlignedMemoryMethods">SetMagickAlignedMemoryMethods</a></h2> 469 470<p>SetMagickAlignedMemoryMethods() sets the methods to acquire and relinquish aligned memory.</p> 471 472<p>The format of the SetMagickAlignedMemoryMethods() method is:</p> 473 474<pre class="text"> 475SetMagickAlignedMemoryMethods( 476 AcquireAlignedMemoryHandler acquire_aligned_memory_handler, 477 RelinquishAlignedMemoryHandler relinquish_aligned_memory_handler) 478</pre> 479 480<p>A description of each parameter follows:</p> 481 482<dd> 483</dd> 484 485<dd> </dd> 486<dl class="dl-horizontal"> 487<dt>acquire_memory_handler</dt> 488<dd>method to acquire aligned memory. </dd> 489 490<dd> </dd> 491<dt>relinquish_aligned_memory_handler</dt> 492<dd>method to relinquish aligned memory. </dd> 493 494<dd> </dd> 495</dl> 496<h2><a href="../../api/MagickCore/memory_8c.html" id="SetMagickMemoryMethods">SetMagickMemoryMethods</a></h2> 497 498<p>SetMagickMemoryMethods() sets the methods to acquire, resize, and destroy memory. Your custom memory methods must be set prior to the MagickCoreGenesis() method.</p> 499 500<p>The format of the SetMagickMemoryMethods() method is:</p> 501 502<pre class="text"> 503SetMagickMemoryMethods(AcquireMemoryHandler acquire_memory_handler, 504 ResizeMemoryHandler resize_memory_handler, 505 DestroyMemoryHandler destroy_memory_handler) 506</pre> 507 508<p>A description of each parameter follows:</p> 509 510<dd> 511</dd> 512 513<dd> </dd> 514<dl class="dl-horizontal"> 515<dt>acquire_memory_handler</dt> 516<dd>method to acquire memory (e.g. malloc). </dd> 517 518<dd> </dd> 519<dt>resize_memory_handler</dt> 520<dd>method to resize memory (e.g. realloc). </dd> 521 522<dd> </dd> 523<dt>destroy_memory_handler</dt> 524<dd>method to destroy memory (e.g. free). </dd> 525 526<dd> </dd> 527</dl> 528</div> 529 </div> 530 </main><!-- /.container --> 531 <footer class="magick-footer"> 532 <div class="container-fluid"> 533 <a href="../../www/security-policy.html">Security</a> • 534 <a href="../../www/news.html">News</a> 535 536 <a href="memory.html#"><img class="d-inline" id="wand" alt="And Now a Touch of Magick" width="16" height="16" src="../../../images/wand.ico"/></a> 537 538 <a href="../../www/links.html">Related</a> • 539 <a href="../../www/sitemap.html">Sitemap</a> 540 <br/> 541 <a href="../../www/support.html">Sponsor</a> • 542 <a href="../../www/cite.html">Cite</a> • 543 <a href="http://pgp.mit.edu/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> • 544 <a href="../../www/contact.html">Contact Us</a> 545 <br/> 546 <a href="https://github.com/imagemagick/imagemagick" target="_blank" rel="noopener" aria-label="GitHub"><svg xmlns="http://www.w3.org/2000/svg" class="navbar-nav-svg" viewBox="0 0 512 499.36" width="2%" height="2%" role="img" focusable="false"><title>GitHub</title><path fill="currentColor" fill-rule="evenodd" d="M256 0C114.64 0 0 114.61 0 256c0 113.09 73.34 209 175.08 242.9 12.8 2.35 17.47-5.56 17.47-12.34 0-6.08-.22-22.18-.35-43.54-71.2 15.49-86.2-34.34-86.2-34.34-11.64-29.57-28.42-37.45-28.42-37.45-23.27-15.84 1.73-15.55 1.73-15.55 25.69 1.81 39.21 26.38 39.21 26.38 22.84 39.12 59.92 27.82 74.5 21.27 2.33-16.54 8.94-27.82 16.25-34.22-56.84-6.43-116.6-28.43-116.6-126.49 0-27.95 10-50.8 26.35-68.69-2.63-6.48-11.42-32.5 2.51-67.75 0 0 21.49-6.88 70.4 26.24a242.65 242.65 0 0 1 128.18 0c48.87-33.13 70.33-26.24 70.33-26.24 14 35.25 5.18 61.27 2.55 67.75 16.41 17.9 26.31 40.75 26.31 68.69 0 98.35-59.85 120-116.88 126.32 9.19 7.9 17.38 23.53 17.38 47.41 0 34.22-.31 61.83-.31 70.23 0 6.85 4.61 14.81 17.6 12.31C438.72 464.97 512 369.08 512 256.02 512 114.62 397.37 0 256 0z"/></svg></a> • 547 <a href="https://twitter.com/imagemagick" target="_blank" rel="noopener" aria-label="Twitter"><svg xmlns="http://www.w3.org/2000/svg" class="navbar-nav-svg" viewBox="0 0 512 416.32" width="2%" height="2%" role="img" focusable="false"><title>Twitter</title><path fill="currentColor" d="M160.83 416.32c193.2 0 298.92-160.22 298.92-298.92 0-4.51 0-9-.2-13.52A214 214 0 0 0 512 49.38a212.93 212.93 0 0 1-60.44 16.6 105.7 105.7 0 0 0 46.3-58.19 209 209 0 0 1-66.79 25.37 105.09 105.09 0 0 0-181.73 71.91 116.12 116.12 0 0 0 2.66 24c-87.28-4.3-164.73-46.3-216.56-109.82A105.48 105.48 0 0 0 68 159.6a106.27 106.27 0 0 1-47.53-13.11v1.43a105.28 105.28 0 0 0 84.21 103.06 105.67 105.67 0 0 1-47.33 1.84 105.06 105.06 0 0 0 98.14 72.94A210.72 210.72 0 0 1 25 370.84a202.17 202.17 0 0 1-25-1.43 298.85 298.85 0 0 0 160.83 46.92"/></svg></a> 548 <br/> 549 <small>© 1999-2021 ImageMagick Studio LLC</small> 550 </div> 551 </footer> 552 553 <!-- Javascript assets --> 554 <script src="../../assets/magick.js" ></script> 555 </body> 556</html> 557