1 /* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 2 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _PTHREAD_H 21 #define _PTHREAD_H 1 22 23 #include <features.h> 24 #include <endian.h> 25 #include <sched.h> 26 #include <time.h> 27 28 #include <bits/pthreadtypes.h> 29 #include <bits/setjmp.h> 30 #include <bits/wordsize.h> 31 32 33 /* Detach state. */ 34 enum 35 { 36 PTHREAD_CREATE_JOINABLE, 37 #define PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_JOINABLE 38 PTHREAD_CREATE_DETACHED 39 #define PTHREAD_CREATE_DETACHED PTHREAD_CREATE_DETACHED 40 }; 41 42 43 /* Mutex types. */ 44 enum 45 { 46 PTHREAD_MUTEX_TIMED_NP, 47 PTHREAD_MUTEX_RECURSIVE_NP, 48 PTHREAD_MUTEX_ERRORCHECK_NP, 49 PTHREAD_MUTEX_ADAPTIVE_NP 50 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 51 , 52 PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_TIMED_NP, 53 PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP, 54 PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP, 55 PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL 56 #endif 57 #ifdef __USE_GNU 58 /* For compatibility. */ 59 , PTHREAD_MUTEX_FAST_NP = PTHREAD_MUTEX_TIMED_NP 60 #endif 61 }; 62 63 64 #ifdef __USE_XOPEN2K 65 /* Robust mutex or not flags. */ 66 enum 67 { 68 PTHREAD_MUTEX_STALLED, 69 PTHREAD_MUTEX_STALLED_NP = PTHREAD_MUTEX_STALLED, 70 PTHREAD_MUTEX_ROBUST, 71 PTHREAD_MUTEX_ROBUST_NP = PTHREAD_MUTEX_ROBUST 72 }; 73 #endif 74 75 76 #ifdef __USE_UNIX98 77 /* Mutex protocols. */ 78 enum 79 { 80 PTHREAD_PRIO_NONE, 81 PTHREAD_PRIO_INHERIT, 82 PTHREAD_PRIO_PROTECT 83 }; 84 #endif 85 86 87 /* Mutex initializers. */ 88 #if __WORDSIZE == 64 89 # define PTHREAD_MUTEX_INITIALIZER \ 90 { { 0, 0, 0, 0, 0, 0, { 0, 0 } } } 91 # ifdef __USE_GNU 92 # define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP \ 93 { { 0, 0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, 0, { 0, 0 } } } 94 # define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP \ 95 { { 0, 0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, 0, { 0, 0 } } } 96 # define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP \ 97 { { 0, 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, 0, { 0, 0 } } } 98 # endif 99 #else 100 # define PTHREAD_MUTEX_INITIALIZER \ 101 { { 0, 0, 0, 0, 0, { 0 } } } 102 # ifdef __USE_GNU 103 # define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP \ 104 { { 0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, 0, { 0 } } } 105 # define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP \ 106 { { 0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, 0, { 0 } } } 107 # define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP \ 108 { { 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, 0, { 0 } } } 109 # endif 110 #endif 111 112 113 /* Read-write lock types. */ 114 #if defined __USE_UNIX98 || defined __USE_XOPEN2K 115 enum 116 { 117 PTHREAD_RWLOCK_PREFER_READER_NP, 118 PTHREAD_RWLOCK_PREFER_WRITER_NP, 119 PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, 120 PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_READER_NP 121 }; 122 123 /* Read-write lock initializers. */ 124 # define PTHREAD_RWLOCK_INITIALIZER \ 125 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } } 126 # ifdef __USE_GNU 127 # if __WORDSIZE == 64 128 # define PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP \ 129 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 130 PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP } } 131 # else 132 # if __BYTE_ORDER == __LITTLE_ENDIAN 133 # define PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP \ 134 { { 0, 0, 0, 0, 0, 0, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, \ 135 0, 0, 0, 0 } } 136 # else 137 # define PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP \ 138 { { 0, 0, 0, 0, 0, 0, 0, 0, 0, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP,\ 139 0 } } 140 # endif 141 # endif 142 # endif 143 #endif /* Unix98 or XOpen2K */ 144 145 146 /* Scheduler inheritance. */ 147 enum 148 { 149 PTHREAD_INHERIT_SCHED, 150 #define PTHREAD_INHERIT_SCHED PTHREAD_INHERIT_SCHED 151 PTHREAD_EXPLICIT_SCHED 152 #define PTHREAD_EXPLICIT_SCHED PTHREAD_EXPLICIT_SCHED 153 }; 154 155 156 /* Scope handling. */ 157 enum 158 { 159 PTHREAD_SCOPE_SYSTEM, 160 #define PTHREAD_SCOPE_SYSTEM PTHREAD_SCOPE_SYSTEM 161 PTHREAD_SCOPE_PROCESS 162 #define PTHREAD_SCOPE_PROCESS PTHREAD_SCOPE_PROCESS 163 }; 164 165 166 /* Process shared or private flag. */ 167 enum 168 { 169 PTHREAD_PROCESS_PRIVATE, 170 #define PTHREAD_PROCESS_PRIVATE PTHREAD_PROCESS_PRIVATE 171 PTHREAD_PROCESS_SHARED 172 #define PTHREAD_PROCESS_SHARED PTHREAD_PROCESS_SHARED 173 }; 174 175 176 177 /* Conditional variable handling. */ 178 #define PTHREAD_COND_INITIALIZER { { 0, 0, 0, 0, 0, (void *) 0, 0, 0 } } 179 180 181 /* Cleanup buffers */ 182 struct _pthread_cleanup_buffer 183 { 184 void (*__routine) (void *); /* Function to call. */ 185 void *__arg; /* Its argument. */ 186 int __canceltype; /* Saved cancellation type. */ 187 struct _pthread_cleanup_buffer *__prev; /* Chaining of cleanup functions. */ 188 }; 189 190 /* Cancellation */ 191 enum 192 { 193 PTHREAD_CANCEL_ENABLE, 194 #define PTHREAD_CANCEL_ENABLE PTHREAD_CANCEL_ENABLE 195 PTHREAD_CANCEL_DISABLE 196 #define PTHREAD_CANCEL_DISABLE PTHREAD_CANCEL_DISABLE 197 }; 198 enum 199 { 200 PTHREAD_CANCEL_DEFERRED, 201 #define PTHREAD_CANCEL_DEFERRED PTHREAD_CANCEL_DEFERRED 202 PTHREAD_CANCEL_ASYNCHRONOUS 203 #define PTHREAD_CANCEL_ASYNCHRONOUS PTHREAD_CANCEL_ASYNCHRONOUS 204 }; 205 #define PTHREAD_CANCELED ((void *) -1) 206 207 208 /* Single execution handling. */ 209 #define PTHREAD_ONCE_INIT 0 210 211 212 #ifdef __USE_XOPEN2K 213 /* Value returned by 'pthread_barrier_wait' for one of the threads after 214 the required number of threads have called this function. 215 -1 is distinct from 0 and all errno constants */ 216 # define PTHREAD_BARRIER_SERIAL_THREAD -1 217 #endif 218 219 220 __BEGIN_DECLS 221 222 /* Create a new thread, starting with execution of START-ROUTINE 223 getting passed ARG. Creation attributed come from ATTR. The new 224 handle is stored in *NEWTHREAD. */ 225 extern int pthread_create (pthread_t *__restrict __newthread, 226 __const pthread_attr_t *__restrict __attr, 227 void *(*__start_routine) (void *), 228 void *__restrict __arg) __THROWNL __nonnull ((1, 3)); 229 230 /* Terminate calling thread. 231 232 The registered cleanup handlers are called via exception handling 233 so we cannot mark this function with __THROW.*/ 234 extern void pthread_exit (void *__retval) __attribute__ ((__noreturn__)); 235 236 /* Make calling thread wait for termination of the thread TH. The 237 exit status of the thread is stored in *THREAD_RETURN, if THREAD_RETURN 238 is not NULL. 239 240 This function is a cancellation point and therefore not marked with 241 __THROW. */ 242 extern int pthread_join (pthread_t __th, void **__thread_return); 243 244 #ifdef __USE_GNU 245 /* Check whether thread TH has terminated. If yes return the status of 246 the thread in *THREAD_RETURN, if THREAD_RETURN is not NULL. */ 247 extern int pthread_tryjoin_np (pthread_t __th, void **__thread_return) __THROW; 248 249 /* Make calling thread wait for termination of the thread TH, but only 250 until TIMEOUT. The exit status of the thread is stored in 251 *THREAD_RETURN, if THREAD_RETURN is not NULL. 252 253 This function is a cancellation point and therefore not marked with 254 __THROW. */ 255 extern int pthread_timedjoin_np (pthread_t __th, void **__thread_return, 256 __const struct timespec *__abstime); 257 #endif 258 259 /* Indicate that the thread TH is never to be joined with PTHREAD_JOIN. 260 The resources of TH will therefore be freed immediately when it 261 terminates, instead of waiting for another thread to perform PTHREAD_JOIN 262 on it. */ 263 extern int pthread_detach (pthread_t __th) __THROW; 264 265 266 /* Obtain the identifier of the current thread. */ 267 extern pthread_t pthread_self (void) __THROW __attribute__ ((__const__)); 268 269 /* Compare two thread identifiers. */ 270 extern int pthread_equal (pthread_t __thread1, pthread_t __thread2) __THROW; 271 272 273 /* Thread attribute handling. */ 274 275 /* Initialize thread attribute *ATTR with default attributes 276 (detachstate is PTHREAD_JOINABLE, scheduling policy is SCHED_OTHER, 277 no user-provided stack). */ 278 extern int pthread_attr_init (pthread_attr_t *__attr) __THROW __nonnull ((1)); 279 280 /* Destroy thread attribute *ATTR. */ 281 extern int pthread_attr_destroy (pthread_attr_t *__attr) 282 __THROW __nonnull ((1)); 283 284 /* Get detach state attribute. */ 285 extern int pthread_attr_getdetachstate (__const pthread_attr_t *__attr, 286 int *__detachstate) 287 __THROW __nonnull ((1, 2)); 288 289 /* Set detach state attribute. */ 290 extern int pthread_attr_setdetachstate (pthread_attr_t *__attr, 291 int __detachstate) 292 __THROW __nonnull ((1)); 293 294 295 /* Get the size of the guard area created for stack overflow protection. */ 296 extern int pthread_attr_getguardsize (__const pthread_attr_t *__attr, 297 size_t *__guardsize) 298 __THROW __nonnull ((1, 2)); 299 300 /* Set the size of the guard area created for stack overflow protection. */ 301 extern int pthread_attr_setguardsize (pthread_attr_t *__attr, 302 size_t __guardsize) 303 __THROW __nonnull ((1)); 304 305 306 /* Return in *PARAM the scheduling parameters of *ATTR. */ 307 extern int pthread_attr_getschedparam (__const pthread_attr_t *__restrict 308 __attr, 309 struct sched_param *__restrict __param) 310 __THROW __nonnull ((1, 2)); 311 312 /* Set scheduling parameters (priority, etc) in *ATTR according to PARAM. */ 313 extern int pthread_attr_setschedparam (pthread_attr_t *__restrict __attr, 314 __const struct sched_param *__restrict 315 __param) __THROW __nonnull ((1, 2)); 316 317 /* Return in *POLICY the scheduling policy of *ATTR. */ 318 extern int pthread_attr_getschedpolicy (__const pthread_attr_t *__restrict 319 __attr, int *__restrict __policy) 320 __THROW __nonnull ((1, 2)); 321 322 /* Set scheduling policy in *ATTR according to POLICY. */ 323 extern int pthread_attr_setschedpolicy (pthread_attr_t *__attr, int __policy) 324 __THROW __nonnull ((1)); 325 326 /* Return in *INHERIT the scheduling inheritance mode of *ATTR. */ 327 extern int pthread_attr_getinheritsched (__const pthread_attr_t *__restrict 328 __attr, int *__restrict __inherit) 329 __THROW __nonnull ((1, 2)); 330 331 /* Set scheduling inheritance mode in *ATTR according to INHERIT. */ 332 extern int pthread_attr_setinheritsched (pthread_attr_t *__attr, 333 int __inherit) 334 __THROW __nonnull ((1)); 335 336 337 /* Return in *SCOPE the scheduling contention scope of *ATTR. */ 338 extern int pthread_attr_getscope (__const pthread_attr_t *__restrict __attr, 339 int *__restrict __scope) 340 __THROW __nonnull ((1, 2)); 341 342 /* Set scheduling contention scope in *ATTR according to SCOPE. */ 343 extern int pthread_attr_setscope (pthread_attr_t *__attr, int __scope) 344 __THROW __nonnull ((1)); 345 346 /* Return the previously set address for the stack. */ 347 extern int pthread_attr_getstackaddr (__const pthread_attr_t *__restrict 348 __attr, void **__restrict __stackaddr) 349 __THROW __nonnull ((1, 2)) __attribute_deprecated__; 350 351 /* Set the starting address of the stack of the thread to be created. 352 Depending on whether the stack grows up or down the value must either 353 be higher or lower than all the address in the memory block. The 354 minimal size of the block must be PTHREAD_STACK_MIN. */ 355 extern int pthread_attr_setstackaddr (pthread_attr_t *__attr, 356 void *__stackaddr) 357 __THROW __nonnull ((1)) __attribute_deprecated__; 358 359 /* Return the currently used minimal stack size. */ 360 extern int pthread_attr_getstacksize (__const pthread_attr_t *__restrict 361 __attr, size_t *__restrict __stacksize) 362 __THROW __nonnull ((1, 2)); 363 364 /* Add information about the minimum stack size needed for the thread 365 to be started. This size must never be less than PTHREAD_STACK_MIN 366 and must also not exceed the system limits. */ 367 extern int pthread_attr_setstacksize (pthread_attr_t *__attr, 368 size_t __stacksize) 369 __THROW __nonnull ((1)); 370 371 #ifdef __USE_XOPEN2K 372 /* Return the previously set address for the stack. */ 373 extern int pthread_attr_getstack (__const pthread_attr_t *__restrict __attr, 374 void **__restrict __stackaddr, 375 size_t *__restrict __stacksize) 376 __THROW __nonnull ((1, 2, 3)); 377 378 /* The following two interfaces are intended to replace the last two. They 379 require setting the address as well as the size since only setting the 380 address will make the implementation on some architectures impossible. */ 381 extern int pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr, 382 size_t __stacksize) __THROW __nonnull ((1)); 383 #endif 384 385 #ifdef __USE_GNU 386 /* Thread created with attribute ATTR will be limited to run only on 387 the processors represented in CPUSET. */ 388 extern int pthread_attr_setaffinity_np (pthread_attr_t *__attr, 389 size_t __cpusetsize, 390 __const cpu_set_t *__cpuset) 391 __THROW __nonnull ((1, 3)); 392 393 /* Get bit set in CPUSET representing the processors threads created with 394 ATTR can run on. */ 395 extern int pthread_attr_getaffinity_np (__const pthread_attr_t *__attr, 396 size_t __cpusetsize, 397 cpu_set_t *__cpuset) 398 __THROW __nonnull ((1, 3)); 399 400 401 /* Initialize thread attribute *ATTR with attributes corresponding to the 402 already running thread TH. It shall be called on uninitialized ATTR 403 and destroyed with pthread_attr_destroy when no longer needed. */ 404 extern int pthread_getattr_np (pthread_t __th, pthread_attr_t *__attr) 405 __THROW __nonnull ((2)); 406 #endif 407 408 409 /* Functions for scheduling control. */ 410 411 /* Set the scheduling parameters for TARGET_THREAD according to POLICY 412 and *PARAM. */ 413 extern int pthread_setschedparam (pthread_t __target_thread, int __policy, 414 __const struct sched_param *__param) 415 __THROW __nonnull ((3)); 416 417 /* Return in *POLICY and *PARAM the scheduling parameters for TARGET_THREAD. */ 418 extern int pthread_getschedparam (pthread_t __target_thread, 419 int *__restrict __policy, 420 struct sched_param *__restrict __param) 421 __THROW __nonnull ((2, 3)); 422 423 /* Set the scheduling priority for TARGET_THREAD. */ 424 extern int pthread_setschedprio (pthread_t __target_thread, int __prio) 425 __THROW; 426 427 428 #ifdef __USE_GNU 429 /* Get thread name visible in the kernel and its interfaces. */ 430 extern int pthread_getname_np (pthread_t __target_thread, char *__buf, 431 size_t __buflen) 432 __THROW __nonnull ((2)); 433 434 /* Set thread name visible in the kernel and its interfaces. */ 435 extern int pthread_setname_np (pthread_t __target_thread, __const char *__name) 436 __THROW __nonnull ((2)); 437 #endif 438 439 440 #ifdef __USE_UNIX98 441 /* Determine level of concurrency. */ 442 extern int pthread_getconcurrency (void) __THROW; 443 444 /* Set new concurrency level to LEVEL. */ 445 extern int pthread_setconcurrency (int __level) __THROW; 446 #endif 447 448 #ifdef __USE_GNU 449 /* Yield the processor to another thread or process. 450 This function is similar to the POSIX `sched_yield' function but 451 might be differently implemented in the case of a m-on-n thread 452 implementation. */ 453 extern int pthread_yield (void) __THROW; 454 455 456 /* Limit specified thread TH to run only on the processors represented 457 in CPUSET. */ 458 extern int pthread_setaffinity_np (pthread_t __th, size_t __cpusetsize, 459 __const cpu_set_t *__cpuset) 460 __THROW __nonnull ((3)); 461 462 /* Get bit set in CPUSET representing the processors TH can run on. */ 463 extern int pthread_getaffinity_np (pthread_t __th, size_t __cpusetsize, 464 cpu_set_t *__cpuset) 465 __THROW __nonnull ((3)); 466 #endif 467 468 469 /* Functions for handling initialization. */ 470 471 /* Guarantee that the initialization function INIT_ROUTINE will be called 472 only once, even if pthread_once is executed several times with the 473 same ONCE_CONTROL argument. ONCE_CONTROL must point to a static or 474 extern variable initialized to PTHREAD_ONCE_INIT. 475 476 The initialization functions might throw exception which is why 477 this function is not marked with __THROW. */ 478 extern int pthread_once (pthread_once_t *__once_control, 479 void (*__init_routine) (void)) __nonnull ((1, 2)); 480 481 482 /* Functions for handling cancellation. 483 484 Note that these functions are explicitly not marked to not throw an 485 exception in C++ code. If cancellation is implemented by unwinding 486 this is necessary to have the compiler generate the unwind information. */ 487 488 /* Set cancelability state of current thread to STATE, returning old 489 state in *OLDSTATE if OLDSTATE is not NULL. */ 490 extern int pthread_setcancelstate (int __state, int *__oldstate); 491 492 /* Set cancellation state of current thread to TYPE, returning the old 493 type in *OLDTYPE if OLDTYPE is not NULL. */ 494 extern int pthread_setcanceltype (int __type, int *__oldtype); 495 496 /* Cancel THREAD immediately or at the next possibility. */ 497 extern int pthread_cancel (pthread_t __th); 498 499 /* Test for pending cancellation for the current thread and terminate 500 the thread as per pthread_exit(PTHREAD_CANCELED) if it has been 501 cancelled. */ 502 extern void pthread_testcancel (void); 503 504 505 /* Cancellation handling with integration into exception handling. */ 506 507 typedef struct 508 { 509 struct 510 { 511 __jmp_buf __cancel_jmp_buf; 512 int __mask_was_saved; 513 } __cancel_jmp_buf[1]; 514 void *__pad[4]; 515 } __pthread_unwind_buf_t __attribute__ ((__aligned__)); 516 517 /* No special attributes by default. */ 518 #ifndef __cleanup_fct_attribute 519 # define __cleanup_fct_attribute 520 #endif 521 522 523 /* Structure to hold the cleanup handler information. */ 524 struct __pthread_cleanup_frame 525 { 526 void (*__cancel_routine) (void *); 527 void *__cancel_arg; 528 int __do_it; 529 int __cancel_type; 530 }; 531 532 #if defined __GNUC__ && defined __EXCEPTIONS 533 # ifdef __cplusplus 534 /* Class to handle cancellation handler invocation. */ 535 class __pthread_cleanup_class 536 { 537 void (*__cancel_routine) (void *); 538 void *__cancel_arg; 539 int __do_it; 540 int __cancel_type; 541 542 public: 543 __pthread_cleanup_class (void (*__fct) (void *), void *__arg) 544 : __cancel_routine (__fct), __cancel_arg (__arg), __do_it (1) { } 545 ~__pthread_cleanup_class () { if (__do_it) __cancel_routine (__cancel_arg); } 546 void __setdoit (int __newval) { __do_it = __newval; } 547 void __defer () { pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED, 548 &__cancel_type); } 549 void __restore () const { pthread_setcanceltype (__cancel_type, 0); } 550 }; 551 552 /* Install a cleanup handler: ROUTINE will be called with arguments ARG 553 when the thread is canceled or calls pthread_exit. ROUTINE will also 554 be called with arguments ARG when the matching pthread_cleanup_pop 555 is executed with non-zero EXECUTE argument. 556 557 pthread_cleanup_push and pthread_cleanup_pop are macros and must always 558 be used in matching pairs at the same nesting level of braces. */ 559 # define pthread_cleanup_push(routine, arg) \ 560 do { \ 561 __pthread_cleanup_class __clframe (routine, arg) 562 563 /* Remove a cleanup handler installed by the matching pthread_cleanup_push. 564 If EXECUTE is non-zero, the handler function is called. */ 565 # define pthread_cleanup_pop(execute) \ 566 __clframe.__setdoit (execute); \ 567 } while (0) 568 569 # ifdef __USE_GNU 570 /* Install a cleanup handler as pthread_cleanup_push does, but also 571 saves the current cancellation type and sets it to deferred 572 cancellation. */ 573 # define pthread_cleanup_push_defer_np(routine, arg) \ 574 do { \ 575 __pthread_cleanup_class __clframe (routine, arg); \ 576 __clframe.__defer () 577 578 /* Remove a cleanup handler as pthread_cleanup_pop does, but also 579 restores the cancellation type that was in effect when the matching 580 pthread_cleanup_push_defer was called. */ 581 # define pthread_cleanup_pop_restore_np(execute) \ 582 __clframe.__restore (); \ 583 __clframe.__setdoit (execute); \ 584 } while (0) 585 # endif 586 # else 587 /* Function called to call the cleanup handler. As an extern inline 588 function the compiler is free to decide inlining the change when 589 needed or fall back on the copy which must exist somewhere 590 else. */ 591 __extern_inline void 592 __pthread_cleanup_routine (struct __pthread_cleanup_frame *__frame) 593 { 594 if (__frame->__do_it) 595 __frame->__cancel_routine (__frame->__cancel_arg); 596 } 597 598 /* Install a cleanup handler: ROUTINE will be called with arguments ARG 599 when the thread is canceled or calls pthread_exit. ROUTINE will also 600 be called with arguments ARG when the matching pthread_cleanup_pop 601 is executed with non-zero EXECUTE argument. 602 603 pthread_cleanup_push and pthread_cleanup_pop are macros and must always 604 be used in matching pairs at the same nesting level of braces. */ 605 # define pthread_cleanup_push(routine, arg) \ 606 do { \ 607 struct __pthread_cleanup_frame __clframe \ 608 __attribute__ ((__cleanup__ (__pthread_cleanup_routine))) \ 609 = { .__cancel_routine = (routine), .__cancel_arg = (arg), \ 610 .__do_it = 1 }; 611 612 /* Remove a cleanup handler installed by the matching pthread_cleanup_push. 613 If EXECUTE is non-zero, the handler function is called. */ 614 # define pthread_cleanup_pop(execute) \ 615 __clframe.__do_it = (execute); \ 616 } while (0) 617 618 # ifdef __USE_GNU 619 /* Install a cleanup handler as pthread_cleanup_push does, but also 620 saves the current cancellation type and sets it to deferred 621 cancellation. */ 622 # define pthread_cleanup_push_defer_np(routine, arg) \ 623 do { \ 624 struct __pthread_cleanup_frame __clframe \ 625 __attribute__ ((__cleanup__ (__pthread_cleanup_routine))) \ 626 = { .__cancel_routine = (routine), .__cancel_arg = (arg), \ 627 .__do_it = 1 }; \ 628 (void) pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED, \ 629 &__clframe.__cancel_type) 630 631 /* Remove a cleanup handler as pthread_cleanup_pop does, but also 632 restores the cancellation type that was in effect when the matching 633 pthread_cleanup_push_defer was called. */ 634 # define pthread_cleanup_pop_restore_np(execute) \ 635 (void) pthread_setcanceltype (__clframe.__cancel_type, NULL); \ 636 __clframe.__do_it = (execute); \ 637 } while (0) 638 # endif 639 # endif 640 #else 641 /* Install a cleanup handler: ROUTINE will be called with arguments ARG 642 when the thread is canceled or calls pthread_exit. ROUTINE will also 643 be called with arguments ARG when the matching pthread_cleanup_pop 644 is executed with non-zero EXECUTE argument. 645 646 pthread_cleanup_push and pthread_cleanup_pop are macros and must always 647 be used in matching pairs at the same nesting level of braces. */ 648 # define pthread_cleanup_push(routine, arg) \ 649 do { \ 650 __pthread_unwind_buf_t __cancel_buf; \ 651 void (*__cancel_routine) (void *) = (routine); \ 652 void *__cancel_arg = (arg); \ 653 int __not_first_call = __sigsetjmp ((struct __jmp_buf_tag *) (void *) \ 654 __cancel_buf.__cancel_jmp_buf, 0); \ 655 if (__builtin_expect (__not_first_call, 0)) \ 656 { \ 657 __cancel_routine (__cancel_arg); \ 658 __pthread_unwind_next (&__cancel_buf); \ 659 /* NOTREACHED */ \ 660 } \ 661 \ 662 __pthread_register_cancel (&__cancel_buf); \ 663 do { 664 extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf) 665 __cleanup_fct_attribute; 666 667 /* Remove a cleanup handler installed by the matching pthread_cleanup_push. 668 If EXECUTE is non-zero, the handler function is called. */ 669 # define pthread_cleanup_pop(execute) \ 670 do { } while (0);/* Empty to allow label before pthread_cleanup_pop. */\ 671 } while (0); \ 672 __pthread_unregister_cancel (&__cancel_buf); \ 673 if (execute) \ 674 __cancel_routine (__cancel_arg); \ 675 } while (0) 676 extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf) 677 __cleanup_fct_attribute; 678 679 # ifdef __USE_GNU 680 /* Install a cleanup handler as pthread_cleanup_push does, but also 681 saves the current cancellation type and sets it to deferred 682 cancellation. */ 683 # define pthread_cleanup_push_defer_np(routine, arg) \ 684 do { \ 685 __pthread_unwind_buf_t __cancel_buf; \ 686 void (*__cancel_routine) (void *) = (routine); \ 687 void *__cancel_arg = (arg); \ 688 int __not_first_call = __sigsetjmp ((struct __jmp_buf_tag *) (void *) \ 689 __cancel_buf.__cancel_jmp_buf, 0); \ 690 if (__builtin_expect (__not_first_call, 0)) \ 691 { \ 692 __cancel_routine (__cancel_arg); \ 693 __pthread_unwind_next (&__cancel_buf); \ 694 /* NOTREACHED */ \ 695 } \ 696 \ 697 __pthread_register_cancel_defer (&__cancel_buf); \ 698 do { 699 extern void __pthread_register_cancel_defer (__pthread_unwind_buf_t *__buf) 700 __cleanup_fct_attribute; 701 702 /* Remove a cleanup handler as pthread_cleanup_pop does, but also 703 restores the cancellation type that was in effect when the matching 704 pthread_cleanup_push_defer was called. */ 705 # define pthread_cleanup_pop_restore_np(execute) \ 706 do { } while (0);/* Empty to allow label before pthread_cleanup_pop. */\ 707 } while (0); \ 708 __pthread_unregister_cancel_restore (&__cancel_buf); \ 709 if (execute) \ 710 __cancel_routine (__cancel_arg); \ 711 } while (0) 712 extern void __pthread_unregister_cancel_restore (__pthread_unwind_buf_t *__buf) 713 __cleanup_fct_attribute; 714 # endif 715 716 /* Internal interface to initiate cleanup. */ 717 extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf) 718 __cleanup_fct_attribute __attribute__ ((__noreturn__)) 719 # ifndef SHARED 720 __attribute__ ((__weak__)) 721 # endif 722 ; 723 #endif 724 725 /* Function used in the macros. */ 726 struct __jmp_buf_tag; 727 extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask) __THROW; 728 729 730 /* Mutex handling. */ 731 732 /* Initialize a mutex. */ 733 extern int pthread_mutex_init (pthread_mutex_t *__mutex, 734 __const pthread_mutexattr_t *__mutexattr) 735 __THROW __nonnull ((1)); 736 737 /* Destroy a mutex. */ 738 extern int pthread_mutex_destroy (pthread_mutex_t *__mutex) 739 __THROW __nonnull ((1)); 740 741 /* Try locking a mutex. */ 742 extern int pthread_mutex_trylock (pthread_mutex_t *__mutex) 743 __THROWNL __nonnull ((1)); 744 745 /* Lock a mutex. */ 746 extern int pthread_mutex_lock (pthread_mutex_t *__mutex) 747 __THROWNL __nonnull ((1)); 748 749 #ifdef __USE_XOPEN2K 750 /* Wait until lock becomes available, or specified time passes. */ 751 extern int pthread_mutex_timedlock (pthread_mutex_t *__restrict __mutex, 752 __const struct timespec *__restrict 753 __abstime) __THROWNL __nonnull ((1, 2)); 754 #endif 755 756 /* Unlock a mutex. */ 757 extern int pthread_mutex_unlock (pthread_mutex_t *__mutex) 758 __THROWNL __nonnull ((1)); 759 760 761 /* Get the priority ceiling of MUTEX. */ 762 extern int pthread_mutex_getprioceiling (__const pthread_mutex_t * 763 __restrict __mutex, 764 int *__restrict __prioceiling) 765 __THROW __nonnull ((1, 2)); 766 767 /* Set the priority ceiling of MUTEX to PRIOCEILING, return old 768 priority ceiling value in *OLD_CEILING. */ 769 extern int pthread_mutex_setprioceiling (pthread_mutex_t *__restrict __mutex, 770 int __prioceiling, 771 int *__restrict __old_ceiling) 772 __THROW __nonnull ((1, 3)); 773 774 775 #ifdef __USE_XOPEN2K8 776 /* Declare the state protected by MUTEX as consistent. */ 777 extern int pthread_mutex_consistent (pthread_mutex_t *__mutex) 778 __THROW __nonnull ((1)); 779 # ifdef __USE_GNU 780 extern int pthread_mutex_consistent_np (pthread_mutex_t *__mutex) 781 __THROW __nonnull ((1)); 782 # endif 783 #endif 784 785 786 /* Functions for handling mutex attributes. */ 787 788 /* Initialize mutex attribute object ATTR with default attributes 789 (kind is PTHREAD_MUTEX_TIMED_NP). */ 790 extern int pthread_mutexattr_init (pthread_mutexattr_t *__attr) 791 __THROW __nonnull ((1)); 792 793 /* Destroy mutex attribute object ATTR. */ 794 extern int pthread_mutexattr_destroy (pthread_mutexattr_t *__attr) 795 __THROW __nonnull ((1)); 796 797 /* Get the process-shared flag of the mutex attribute ATTR. */ 798 extern int pthread_mutexattr_getpshared (__const pthread_mutexattr_t * 799 __restrict __attr, 800 int *__restrict __pshared) 801 __THROW __nonnull ((1, 2)); 802 803 /* Set the process-shared flag of the mutex attribute ATTR. */ 804 extern int pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr, 805 int __pshared) 806 __THROW __nonnull ((1)); 807 808 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 809 /* Return in *KIND the mutex kind attribute in *ATTR. */ 810 extern int pthread_mutexattr_gettype (__const pthread_mutexattr_t *__restrict 811 __attr, int *__restrict __kind) 812 __THROW __nonnull ((1, 2)); 813 814 /* Set the mutex kind attribute in *ATTR to KIND (either PTHREAD_MUTEX_NORMAL, 815 PTHREAD_MUTEX_RECURSIVE, PTHREAD_MUTEX_ERRORCHECK, or 816 PTHREAD_MUTEX_DEFAULT). */ 817 extern int pthread_mutexattr_settype (pthread_mutexattr_t *__attr, int __kind) 818 __THROW __nonnull ((1)); 819 #endif 820 821 /* Return in *PROTOCOL the mutex protocol attribute in *ATTR. */ 822 extern int pthread_mutexattr_getprotocol (__const pthread_mutexattr_t * 823 __restrict __attr, 824 int *__restrict __protocol) 825 __THROW __nonnull ((1, 2)); 826 827 /* Set the mutex protocol attribute in *ATTR to PROTOCOL (either 828 PTHREAD_PRIO_NONE, PTHREAD_PRIO_INHERIT, or PTHREAD_PRIO_PROTECT). */ 829 extern int pthread_mutexattr_setprotocol (pthread_mutexattr_t *__attr, 830 int __protocol) 831 __THROW __nonnull ((1)); 832 833 /* Return in *PRIOCEILING the mutex prioceiling attribute in *ATTR. */ 834 extern int pthread_mutexattr_getprioceiling (__const pthread_mutexattr_t * 835 __restrict __attr, 836 int *__restrict __prioceiling) 837 __THROW __nonnull ((1, 2)); 838 839 /* Set the mutex prioceiling attribute in *ATTR to PRIOCEILING. */ 840 extern int pthread_mutexattr_setprioceiling (pthread_mutexattr_t *__attr, 841 int __prioceiling) 842 __THROW __nonnull ((1)); 843 844 #ifdef __USE_XOPEN2K 845 /* Get the robustness flag of the mutex attribute ATTR. */ 846 extern int pthread_mutexattr_getrobust (__const pthread_mutexattr_t *__attr, 847 int *__robustness) 848 __THROW __nonnull ((1, 2)); 849 # ifdef __USE_GNU 850 extern int pthread_mutexattr_getrobust_np (__const pthread_mutexattr_t *__attr, 851 int *__robustness) 852 __THROW __nonnull ((1, 2)); 853 # endif 854 855 /* Set the robustness flag of the mutex attribute ATTR. */ 856 extern int pthread_mutexattr_setrobust (pthread_mutexattr_t *__attr, 857 int __robustness) 858 __THROW __nonnull ((1)); 859 # ifdef __USE_GNU 860 extern int pthread_mutexattr_setrobust_np (pthread_mutexattr_t *__attr, 861 int __robustness) 862 __THROW __nonnull ((1)); 863 # endif 864 #endif 865 866 867 #if defined __USE_UNIX98 || defined __USE_XOPEN2K 868 /* Functions for handling read-write locks. */ 869 870 /* Initialize read-write lock RWLOCK using attributes ATTR, or use 871 the default values if later is NULL. */ 872 extern int pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock, 873 __const pthread_rwlockattr_t *__restrict 874 __attr) __THROW __nonnull ((1)); 875 876 /* Destroy read-write lock RWLOCK. */ 877 extern int pthread_rwlock_destroy (pthread_rwlock_t *__rwlock) 878 __THROW __nonnull ((1)); 879 880 /* Acquire read lock for RWLOCK. */ 881 extern int pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock) 882 __THROWNL __nonnull ((1)); 883 884 /* Try to acquire read lock for RWLOCK. */ 885 extern int pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock) 886 __THROWNL __nonnull ((1)); 887 888 # ifdef __USE_XOPEN2K 889 /* Try to acquire read lock for RWLOCK or return after specfied time. */ 890 extern int pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock, 891 __const struct timespec *__restrict 892 __abstime) __THROWNL __nonnull ((1, 2)); 893 # endif 894 895 /* Acquire write lock for RWLOCK. */ 896 extern int pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock) 897 __THROWNL __nonnull ((1)); 898 899 /* Try to acquire write lock for RWLOCK. */ 900 extern int pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock) 901 __THROWNL __nonnull ((1)); 902 903 # ifdef __USE_XOPEN2K 904 /* Try to acquire write lock for RWLOCK or return after specfied time. */ 905 extern int pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock, 906 __const struct timespec *__restrict 907 __abstime) __THROWNL __nonnull ((1, 2)); 908 # endif 909 910 /* Unlock RWLOCK. */ 911 extern int pthread_rwlock_unlock (pthread_rwlock_t *__rwlock) 912 __THROWNL __nonnull ((1)); 913 914 915 /* Functions for handling read-write lock attributes. */ 916 917 /* Initialize attribute object ATTR with default values. */ 918 extern int pthread_rwlockattr_init (pthread_rwlockattr_t *__attr) 919 __THROW __nonnull ((1)); 920 921 /* Destroy attribute object ATTR. */ 922 extern int pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr) 923 __THROW __nonnull ((1)); 924 925 /* Return current setting of process-shared attribute of ATTR in PSHARED. */ 926 extern int pthread_rwlockattr_getpshared (__const pthread_rwlockattr_t * 927 __restrict __attr, 928 int *__restrict __pshared) 929 __THROW __nonnull ((1, 2)); 930 931 /* Set process-shared attribute of ATTR to PSHARED. */ 932 extern int pthread_rwlockattr_setpshared (pthread_rwlockattr_t *__attr, 933 int __pshared) 934 __THROW __nonnull ((1)); 935 936 /* Return current setting of reader/writer preference. */ 937 extern int pthread_rwlockattr_getkind_np (__const pthread_rwlockattr_t * 938 __restrict __attr, 939 int *__restrict __pref) 940 __THROW __nonnull ((1, 2)); 941 942 /* Set reader/write preference. */ 943 extern int pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *__attr, 944 int __pref) __THROW __nonnull ((1)); 945 #endif 946 947 948 /* Functions for handling conditional variables. */ 949 950 /* Initialize condition variable COND using attributes ATTR, or use 951 the default values if later is NULL. */ 952 extern int pthread_cond_init (pthread_cond_t *__restrict __cond, 953 __const pthread_condattr_t *__restrict 954 __cond_attr) __THROW __nonnull ((1)); 955 956 /* Destroy condition variable COND. */ 957 extern int pthread_cond_destroy (pthread_cond_t *__cond) 958 __THROW __nonnull ((1)); 959 960 /* Wake up one thread waiting for condition variable COND. */ 961 extern int pthread_cond_signal (pthread_cond_t *__cond) 962 __THROWNL __nonnull ((1)); 963 964 /* Wake up all threads waiting for condition variables COND. */ 965 extern int pthread_cond_broadcast (pthread_cond_t *__cond) 966 __THROWNL __nonnull ((1)); 967 968 /* Wait for condition variable COND to be signaled or broadcast. 969 MUTEX is assumed to be locked before. 970 971 This function is a cancellation point and therefore not marked with 972 __THROW. */ 973 extern int pthread_cond_wait (pthread_cond_t *__restrict __cond, 974 pthread_mutex_t *__restrict __mutex) 975 __nonnull ((1, 2)); 976 977 /* Wait for condition variable COND to be signaled or broadcast until 978 ABSTIME. MUTEX is assumed to be locked before. ABSTIME is an 979 absolute time specification; zero is the beginning of the epoch 980 (00:00:00 GMT, January 1, 1970). 981 982 This function is a cancellation point and therefore not marked with 983 __THROW. */ 984 extern int pthread_cond_timedwait (pthread_cond_t *__restrict __cond, 985 pthread_mutex_t *__restrict __mutex, 986 __const struct timespec *__restrict 987 __abstime) __nonnull ((1, 2, 3)); 988 989 /* Functions for handling condition variable attributes. */ 990 991 /* Initialize condition variable attribute ATTR. */ 992 extern int pthread_condattr_init (pthread_condattr_t *__attr) 993 __THROW __nonnull ((1)); 994 995 /* Destroy condition variable attribute ATTR. */ 996 extern int pthread_condattr_destroy (pthread_condattr_t *__attr) 997 __THROW __nonnull ((1)); 998 999 /* Get the process-shared flag of the condition variable attribute ATTR. */ 1000 extern int pthread_condattr_getpshared (__const pthread_condattr_t * 1001 __restrict __attr, 1002 int *__restrict __pshared) 1003 __THROW __nonnull ((1, 2)); 1004 1005 /* Set the process-shared flag of the condition variable attribute ATTR. */ 1006 extern int pthread_condattr_setpshared (pthread_condattr_t *__attr, 1007 int __pshared) __THROW __nonnull ((1)); 1008 1009 #ifdef __USE_XOPEN2K 1010 /* Get the clock selected for the conditon variable attribute ATTR. */ 1011 extern int pthread_condattr_getclock (__const pthread_condattr_t * 1012 __restrict __attr, 1013 __clockid_t *__restrict __clock_id) 1014 __THROW __nonnull ((1, 2)); 1015 1016 /* Set the clock selected for the conditon variable attribute ATTR. */ 1017 extern int pthread_condattr_setclock (pthread_condattr_t *__attr, 1018 __clockid_t __clock_id) 1019 __THROW __nonnull ((1)); 1020 #endif 1021 1022 1023 #ifdef __USE_XOPEN2K 1024 /* Functions to handle spinlocks. */ 1025 1026 /* Initialize the spinlock LOCK. If PSHARED is nonzero the spinlock can 1027 be shared between different processes. */ 1028 extern int pthread_spin_init (pthread_spinlock_t *__lock, int __pshared) 1029 __THROW __nonnull ((1)); 1030 1031 /* Destroy the spinlock LOCK. */ 1032 extern int pthread_spin_destroy (pthread_spinlock_t *__lock) 1033 __THROW __nonnull ((1)); 1034 1035 /* Wait until spinlock LOCK is retrieved. */ 1036 extern int pthread_spin_lock (pthread_spinlock_t *__lock) 1037 __THROWNL __nonnull ((1)); 1038 1039 /* Try to lock spinlock LOCK. */ 1040 extern int pthread_spin_trylock (pthread_spinlock_t *__lock) 1041 __THROWNL __nonnull ((1)); 1042 1043 /* Release spinlock LOCK. */ 1044 extern int pthread_spin_unlock (pthread_spinlock_t *__lock) 1045 __THROWNL __nonnull ((1)); 1046 1047 1048 /* Functions to handle barriers. */ 1049 1050 /* Initialize BARRIER with the attributes in ATTR. The barrier is 1051 opened when COUNT waiters arrived. */ 1052 extern int pthread_barrier_init (pthread_barrier_t *__restrict __barrier, 1053 __const pthread_barrierattr_t *__restrict 1054 __attr, unsigned int __count) 1055 __THROW __nonnull ((1)); 1056 1057 /* Destroy a previously dynamically initialized barrier BARRIER. */ 1058 extern int pthread_barrier_destroy (pthread_barrier_t *__barrier) 1059 __THROW __nonnull ((1)); 1060 1061 /* Wait on barrier BARRIER. */ 1062 extern int pthread_barrier_wait (pthread_barrier_t *__barrier) 1063 __THROWNL __nonnull ((1)); 1064 1065 1066 /* Initialize barrier attribute ATTR. */ 1067 extern int pthread_barrierattr_init (pthread_barrierattr_t *__attr) 1068 __THROW __nonnull ((1)); 1069 1070 /* Destroy previously dynamically initialized barrier attribute ATTR. */ 1071 extern int pthread_barrierattr_destroy (pthread_barrierattr_t *__attr) 1072 __THROW __nonnull ((1)); 1073 1074 /* Get the process-shared flag of the barrier attribute ATTR. */ 1075 extern int pthread_barrierattr_getpshared (__const pthread_barrierattr_t * 1076 __restrict __attr, 1077 int *__restrict __pshared) 1078 __THROW __nonnull ((1, 2)); 1079 1080 /* Set the process-shared flag of the barrier attribute ATTR. */ 1081 extern int pthread_barrierattr_setpshared (pthread_barrierattr_t *__attr, 1082 int __pshared) 1083 __THROW __nonnull ((1)); 1084 #endif 1085 1086 1087 /* Functions for handling thread-specific data. */ 1088 1089 /* Create a key value identifying a location in the thread-specific 1090 data area. Each thread maintains a distinct thread-specific data 1091 area. DESTR_FUNCTION, if non-NULL, is called with the value 1092 associated to that key when the key is destroyed. 1093 DESTR_FUNCTION is not called if the value associated is NULL when 1094 the key is destroyed. */ 1095 extern int pthread_key_create (pthread_key_t *__key, 1096 void (*__destr_function) (void *)) 1097 __THROW __nonnull ((1)); 1098 1099 /* Destroy KEY. */ 1100 extern int pthread_key_delete (pthread_key_t __key) __THROW; 1101 1102 /* Return current value of the thread-specific data slot identified by KEY. */ 1103 extern void *pthread_getspecific (pthread_key_t __key) __THROW; 1104 1105 /* Store POINTER in the thread-specific data slot identified by KEY. */ 1106 extern int pthread_setspecific (pthread_key_t __key, 1107 __const void *__pointer) __THROW ; 1108 1109 1110 #ifdef __USE_XOPEN2K 1111 /* Get ID of CPU-time clock for thread THREAD_ID. */ 1112 extern int pthread_getcpuclockid (pthread_t __thread_id, 1113 __clockid_t *__clock_id) 1114 __THROW __nonnull ((2)); 1115 #endif 1116 1117 1118 /* Install handlers to be called when a new process is created with FORK. 1119 The PREPARE handler is called in the parent process just before performing 1120 FORK. The PARENT handler is called in the parent process just after FORK. 1121 The CHILD handler is called in the child process. Each of the three 1122 handlers can be NULL, meaning that no handler needs to be called at that 1123 point. 1124 PTHREAD_ATFORK can be called several times, in which case the PREPARE 1125 handlers are called in LIFO order (last added with PTHREAD_ATFORK, 1126 first called before FORK), and the PARENT and CHILD handlers are called 1127 in FIFO (first added, first called). */ 1128 1129 extern int pthread_atfork (void (*__prepare) (void), 1130 void (*__parent) (void), 1131 void (*__child) (void)) __THROW; 1132 1133 1134 #ifdef __USE_EXTERN_INLINES 1135 /* Optimizations. */ 1136 __extern_inline int 1137 __NTH (pthread_equal (pthread_t __thread1, pthread_t __thread2)) 1138 { 1139 return __thread1 == __thread2; 1140 } 1141 #endif 1142 1143 __END_DECLS 1144 1145 #endif /* pthread.h */ 1146
