1/* Copyright (C) 2002-2020 Free Software Foundation, Inc. 
2 This file is part of the GNU C Library. 
3 
4 The GNU C Library is free software; you can redistribute it and/or 
5 modify it under the terms of the GNU Lesser General Public 
6 License as published by the Free Software Foundation; either 
7 version 2.1 of the License, or (at your option) any later version. 
8 
9 The GNU C Library is distributed in the hope that it will be useful, 
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
12 Lesser General Public License for more details. 
13 
14 You should have received a copy of the GNU Lesser General Public 
15 License along with the GNU C Library; if not, see 
16 <https://www.gnu.org/licenses/>. */ 
17 
18#ifndef _PTHREAD_H 
19#define _PTHREAD_H 1 
20 
21#include <features.h> 
22#include <sched.h> 
23#include <time.h> 
24 
25#include <bits/endian.h> 
26#include <bits/pthreadtypes.h> 
27#include <bits/setjmp.h> 
28#include <bits/wordsize.h> 
29#include <bits/types/struct_timespec.h> 
30 
31 
32/* Detach state. */ 
33enum 
34{ 
35 PTHREAD_CREATE_JOINABLE, 
36#define PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_JOINABLE 
37 PTHREAD_CREATE_DETACHED 
38#define PTHREAD_CREATE_DETACHED PTHREAD_CREATE_DETACHED 
39}; 
40 
41 
42/* Mutex types. */ 
43enum 
44{ 
45 PTHREAD_MUTEX_TIMED_NP, 
46 PTHREAD_MUTEX_RECURSIVE_NP, 
47 PTHREAD_MUTEX_ERRORCHECK_NP, 
48 PTHREAD_MUTEX_ADAPTIVE_NP 
49#if defined __USE_UNIX98 || defined __USE_XOPEN2K8 
50 , 
51 PTHREAD_MUTEX_NORMAL = PTHREAD_MUTEX_TIMED_NP, 
52 PTHREAD_MUTEX_RECURSIVE = PTHREAD_MUTEX_RECURSIVE_NP, 
53 PTHREAD_MUTEX_ERRORCHECK = PTHREAD_MUTEX_ERRORCHECK_NP, 
54 PTHREAD_MUTEX_DEFAULT = PTHREAD_MUTEX_NORMAL 
55#endif 
56#ifdef __USE_GNU 
57 /* For compatibility. */ 
58 , PTHREAD_MUTEX_FAST_NP = PTHREAD_MUTEX_TIMED_NP 
59#endif 
60}; 
61 
62 
63#ifdef __USE_XOPEN2K 
64/* Robust mutex or not flags. */ 
65enum 
66{ 
67 PTHREAD_MUTEX_STALLED, 
68 PTHREAD_MUTEX_STALLED_NP = PTHREAD_MUTEX_STALLED, 
69 PTHREAD_MUTEX_ROBUST, 
70 PTHREAD_MUTEX_ROBUST_NP = PTHREAD_MUTEX_ROBUST 
71}; 
72#endif 
73 
74 
75#if defined __USE_POSIX199506 || defined __USE_UNIX98 
76/* Mutex protocols. */ 
77enum 
78{ 
79 PTHREAD_PRIO_NONE, 
80 PTHREAD_PRIO_INHERIT, 
81 PTHREAD_PRIO_PROTECT 
82}; 
83#endif 
84 
85 
86#define PTHREAD_MUTEX_INITIALIZER \ 
87 { { __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_TIMED_NP) } } 
88#ifdef __USE_GNU 
89# define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP \ 
90 { { __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_RECURSIVE_NP) } } 
91# define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP \ 
92 { { __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_ERRORCHECK_NP) } } 
93# define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP \ 
94 { { __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_ADAPTIVE_NP) } } 
95#endif 
96 
97 
98/* Read-write lock types. */ 
99#if defined __USE_UNIX98 || defined __USE_XOPEN2K 
100enum 
101{ 
102 PTHREAD_RWLOCK_PREFER_READER_NP, 
103 PTHREAD_RWLOCK_PREFER_WRITER_NP, 
104 PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP, 
105 PTHREAD_RWLOCK_DEFAULT_NP = PTHREAD_RWLOCK_PREFER_READER_NP 
106}; 
107 
108 
109/* Read-write lock initializers. */ 
110# define PTHREAD_RWLOCK_INITIALIZER \ 
111 { { __PTHREAD_RWLOCK_INITIALIZER (PTHREAD_RWLOCK_DEFAULT_NP) } } 
112# ifdef __USE_GNU 
113# define PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP \ 
114 { { __PTHREAD_RWLOCK_INITIALIZER (PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP) } } 
115# endif 
116#endif /* Unix98 or XOpen2K */ 
117 
118 
119/* Scheduler inheritance. */ 
120enum 
121{ 
122 PTHREAD_INHERIT_SCHED, 
123#define PTHREAD_INHERIT_SCHED PTHREAD_INHERIT_SCHED 
124 PTHREAD_EXPLICIT_SCHED 
125#define PTHREAD_EXPLICIT_SCHED PTHREAD_EXPLICIT_SCHED 
126}; 
127 
128 
129/* Scope handling. */ 
130enum 
131{ 
132 PTHREAD_SCOPE_SYSTEM, 
133#define PTHREAD_SCOPE_SYSTEM PTHREAD_SCOPE_SYSTEM 
134 PTHREAD_SCOPE_PROCESS 
135#define PTHREAD_SCOPE_PROCESS PTHREAD_SCOPE_PROCESS 
136}; 
137 
138 
139/* Process shared or private flag. */ 
140enum 
141{ 
142 PTHREAD_PROCESS_PRIVATE, 
143#define PTHREAD_PROCESS_PRIVATE PTHREAD_PROCESS_PRIVATE 
144 PTHREAD_PROCESS_SHARED 
145#define PTHREAD_PROCESS_SHARED PTHREAD_PROCESS_SHARED 
146}; 
147 
148 
149 
150/* Conditional variable handling. */ 
151#define PTHREAD_COND_INITIALIZER { { {0}, {0}, {0, 0}, {0, 0}, 0, 0, {0, 0} } } 
152 
153 
154/* Cleanup buffers */ 
155struct _pthread_cleanup_buffer 
156{ 
157 void (*__routine) (void *); /* Function to call. */ 
158 void *__arg; /* Its argument. */ 
159 int __canceltype; /* Saved cancellation type. */ 
160 struct _pthread_cleanup_buffer *__prev; /* Chaining of cleanup functions. */ 
161}; 
162 
163/* Cancellation */ 
164enum 
165{ 
166 PTHREAD_CANCEL_ENABLE, 
167#define PTHREAD_CANCEL_ENABLE PTHREAD_CANCEL_ENABLE 
168 PTHREAD_CANCEL_DISABLE 
169#define PTHREAD_CANCEL_DISABLE PTHREAD_CANCEL_DISABLE 
170}; 
171enum 
172{ 
173 PTHREAD_CANCEL_DEFERRED, 
174#define PTHREAD_CANCEL_DEFERRED PTHREAD_CANCEL_DEFERRED 
175 PTHREAD_CANCEL_ASYNCHRONOUS 
176#define PTHREAD_CANCEL_ASYNCHRONOUS PTHREAD_CANCEL_ASYNCHRONOUS 
177}; 
178#define PTHREAD_CANCELED ((void *) -1) 
179 
180 
181/* Single execution handling. */ 
182#define PTHREAD_ONCE_INIT 0 
183 
184 
185#ifdef __USE_XOPEN2K 
186/* Value returned by 'pthread_barrier_wait' for one of the threads after 
187 the required number of threads have called this function. 
188 -1 is distinct from 0 and all errno constants */ 
189# define PTHREAD_BARRIER_SERIAL_THREAD -1 
190#endif 
191 
192 
193__BEGIN_DECLS 
194 
195/* Create a new thread, starting with execution of START-ROUTINE 
196 getting passed ARG. Creation attributed come from ATTR. The new 
197 handle is stored in *NEWTHREAD. */ 
198extern int pthread_create (pthread_t *__restrict __newthread, 
199 const pthread_attr_t *__restrict __attr, 
200 void *(*__start_routine) (void *), 
201 void *__restrict __arg) __THROWNL __nonnull ((1, 3)); 
202 
203/* Terminate calling thread. 
204 
205 The registered cleanup handlers are called via exception handling 
206 so we cannot mark this function with __THROW.*/ 
207extern void pthread_exit (void *__retval) __attribute__ ((__noreturn__)); 
208 
209/* Make calling thread wait for termination of the thread TH. The 
210 exit status of the thread is stored in *THREAD_RETURN, if THREAD_RETURN 
211 is not NULL. 
212 
213 This function is a cancellation point and therefore not marked with 
214 __THROW. */ 
215extern int pthread_join (pthread_t __th, void **__thread_return); 
216 
217#ifdef __USE_GNU 
218/* Check whether thread TH has terminated. If yes return the status of 
219 the thread in *THREAD_RETURN, if THREAD_RETURN is not NULL. */ 
220extern int pthread_tryjoin_np (pthread_t __th, void **__thread_return) __THROW; 
221 
222/* Make calling thread wait for termination of the thread TH, but only 
223 until TIMEOUT. The exit status of the thread is stored in 
224 *THREAD_RETURN, if THREAD_RETURN is not NULL. 
225 
226 This function is a cancellation point and therefore not marked with 
227 __THROW. */ 
228extern int pthread_timedjoin_np (pthread_t __th, void **__thread_return, 
229 const struct timespec *__abstime); 
230 
231/* Make calling thread wait for termination of the thread TH, but only 
232 until TIMEOUT measured against the clock specified by CLOCKID. The 
233 exit status of the thread is stored in *THREAD_RETURN, if 
234 THREAD_RETURN is not NULL. 
235 
236 This function is a cancellation point and therefore not marked with 
237 __THROW. */ 
238extern int pthread_clockjoin_np (pthread_t __th, void **__thread_return, 
239 clockid_t __clockid, 
240 const struct timespec *__abstime); 
241#endif 
242 
243/* Indicate that the thread TH is never to be joined with PTHREAD_JOIN. 
244 The resources of TH will therefore be freed immediately when it 
245 terminates, instead of waiting for another thread to perform PTHREAD_JOIN 
246 on it. */ 
247extern int pthread_detach (pthread_t __th) __THROW; 
248 
249 
250/* Obtain the identifier of the current thread. */ 
251extern pthread_t pthread_self (void) __THROW __attribute__ ((__const__)); 
252 
253/* Compare two thread identifiers. */ 
254extern int pthread_equal (pthread_t __thread1, pthread_t __thread2) 
255 __THROW __attribute__ ((__const__)); 
256 
257 
258/* Thread attribute handling. */ 
259 
260/* Initialize thread attribute *ATTR with default attributes 
261 (detachstate is PTHREAD_JOINABLE, scheduling policy is SCHED_OTHER, 
262 no user-provided stack). */ 
263extern int pthread_attr_init (pthread_attr_t *__attr) __THROW __nonnull ((1)); 
264 
265/* Destroy thread attribute *ATTR. */ 
266extern int pthread_attr_destroy (pthread_attr_t *__attr) 
267 __THROW __nonnull ((1)); 
268 
269/* Get detach state attribute. */ 
270extern int pthread_attr_getdetachstate (const pthread_attr_t *__attr, 
271 int *__detachstate) 
272 __THROW __nonnull ((1, 2)); 
273 
274/* Set detach state attribute. */ 
275extern int pthread_attr_setdetachstate (pthread_attr_t *__attr, 
276 int __detachstate) 
277 __THROW __nonnull ((1)); 
278 
279 
280/* Get the size of the guard area created for stack overflow protection. */ 
281extern int pthread_attr_getguardsize (const pthread_attr_t *__attr, 
282 size_t *__guardsize) 
283 __THROW __nonnull ((1, 2)); 
284 
285/* Set the size of the guard area created for stack overflow protection. */ 
286extern int pthread_attr_setguardsize (pthread_attr_t *__attr, 
287 size_t __guardsize) 
288 __THROW __nonnull ((1)); 
289 
290 
291/* Return in *PARAM the scheduling parameters of *ATTR. */ 
292extern int pthread_attr_getschedparam (const pthread_attr_t *__restrict __attr, 
293 struct sched_param *__restrict __param) 
294 __THROW __nonnull ((1, 2)); 
295 
296/* Set scheduling parameters (priority, etc) in *ATTR according to PARAM. */ 
297extern int pthread_attr_setschedparam (pthread_attr_t *__restrict __attr, 
298 const struct sched_param *__restrict 
299 __param) __THROW __nonnull ((1, 2)); 
300 
301/* Return in *POLICY the scheduling policy of *ATTR. */ 
302extern int pthread_attr_getschedpolicy (const pthread_attr_t *__restrict 
303 __attr, int *__restrict __policy) 
304 __THROW __nonnull ((1, 2)); 
305 
306/* Set scheduling policy in *ATTR according to POLICY. */ 
307extern int pthread_attr_setschedpolicy (pthread_attr_t *__attr, int __policy) 
308 __THROW __nonnull ((1)); 
309 
310/* Return in *INHERIT the scheduling inheritance mode of *ATTR. */ 
311extern int pthread_attr_getinheritsched (const pthread_attr_t *__restrict 
312 __attr, int *__restrict __inherit) 
313 __THROW __nonnull ((1, 2)); 
314 
315/* Set scheduling inheritance mode in *ATTR according to INHERIT. */ 
316extern int pthread_attr_setinheritsched (pthread_attr_t *__attr, 
317 int __inherit) 
318 __THROW __nonnull ((1)); 
319 
320 
321/* Return in *SCOPE the scheduling contention scope of *ATTR. */ 
322extern int pthread_attr_getscope (const pthread_attr_t *__restrict __attr, 
323 int *__restrict __scope) 
324 __THROW __nonnull ((1, 2)); 
325 
326/* Set scheduling contention scope in *ATTR according to SCOPE. */ 
327extern int pthread_attr_setscope (pthread_attr_t *__attr, int __scope) 
328 __THROW __nonnull ((1)); 
329 
330/* Return the previously set address for the stack. */ 
331extern int pthread_attr_getstackaddr (const pthread_attr_t *__restrict 
332 __attr, void **__restrict __stackaddr) 
333 __THROW __nonnull ((1, 2)) __attribute_deprecated__; 
334 
335/* Set the starting address of the stack of the thread to be created. 
336 Depending on whether the stack grows up or down the value must either 
337 be higher or lower than all the address in the memory block. The 
338 minimal size of the block must be PTHREAD_STACK_MIN. */ 
339extern int pthread_attr_setstackaddr (pthread_attr_t *__attr, 
340 void *__stackaddr) 
341 __THROW __nonnull ((1)) __attribute_deprecated__; 
342 
343/* Return the currently used minimal stack size. */ 
344extern int pthread_attr_getstacksize (const pthread_attr_t *__restrict 
345 __attr, size_t *__restrict __stacksize) 
346 __THROW __nonnull ((1, 2)); 
347 
348/* Add information about the minimum stack size needed for the thread 
349 to be started. This size must never be less than PTHREAD_STACK_MIN 
350 and must also not exceed the system limits. */ 
351extern int pthread_attr_setstacksize (pthread_attr_t *__attr, 
352 size_t __stacksize) 
353 __THROW __nonnull ((1)); 
354 
355#ifdef __USE_XOPEN2K 
356/* Return the previously set address for the stack. */ 
357extern int pthread_attr_getstack (const pthread_attr_t *__restrict __attr, 
358 void **__restrict __stackaddr, 
359 size_t *__restrict __stacksize) 
360 __THROW __nonnull ((1, 2, 3)); 
361 
362/* The following two interfaces are intended to replace the last two. They 
363 require setting the address as well as the size since only setting the 
364 address will make the implementation on some architectures impossible. */ 
365extern int pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr, 
366 size_t __stacksize) __THROW __nonnull ((1)); 
367#endif 
368 
369#ifdef __USE_GNU 
370/* Thread created with attribute ATTR will be limited to run only on 
371 the processors represented in CPUSET. */ 
372extern int pthread_attr_setaffinity_np (pthread_attr_t *__attr, 
373 size_t __cpusetsize, 
374 const cpu_set_t *__cpuset) 
375 __THROW __nonnull ((1, 3)); 
376 
377/* Get bit set in CPUSET representing the processors threads created with 
378 ATTR can run on. */ 
379extern int pthread_attr_getaffinity_np (const pthread_attr_t *__attr, 
380 size_t __cpusetsize, 
381 cpu_set_t *__cpuset) 
382 __THROW __nonnull ((1, 3)); 
383 
384/* Get the default attributes used by pthread_create in this process. */ 
385extern int pthread_getattr_default_np (pthread_attr_t *__attr) 
386 __THROW __nonnull ((1)); 
387 
388/* Set the default attributes to be used by pthread_create in this 
389 process. */ 
390extern int pthread_setattr_default_np (const pthread_attr_t *__attr) 
391 __THROW __nonnull ((1)); 
392 
393/* Initialize thread attribute *ATTR with attributes corresponding to the 
394 already running thread TH. It shall be called on uninitialized ATTR 
395 and destroyed with pthread_attr_destroy when no longer needed. */ 
396extern int pthread_getattr_np (pthread_t __th, pthread_attr_t *__attr) 
397 __THROW __nonnull ((2)); 
398#endif 
399 
400 
401/* Functions for scheduling control. */ 
402 
403/* Set the scheduling parameters for TARGET_THREAD according to POLICY 
404 and *PARAM. */ 
405extern int pthread_setschedparam (pthread_t __target_thread, int __policy, 
406 const struct sched_param *__param) 
407 __THROW __nonnull ((3)); 
408 
409/* Return in *POLICY and *PARAM the scheduling parameters for TARGET_THREAD. */ 
410extern int pthread_getschedparam (pthread_t __target_thread, 
411 int *__restrict __policy, 
412 struct sched_param *__restrict __param) 
413 __THROW __nonnull ((2, 3)); 
414 
415/* Set the scheduling priority for TARGET_THREAD. */ 
416extern int pthread_setschedprio (pthread_t __target_thread, int __prio) 
417 __THROW; 
418 
419 
420#ifdef __USE_GNU 
421/* Get thread name visible in the kernel and its interfaces. */ 
422extern int pthread_getname_np (pthread_t __target_thread, char *__buf, 
423 size_t __buflen) 
424 __THROW __nonnull ((2)); 
425 
426/* Set thread name visible in the kernel and its interfaces. */ 
427extern int pthread_setname_np (pthread_t __target_thread, const char *__name) 
428 __THROW __nonnull ((2)); 
429#endif 
430 
431 
432#ifdef __USE_UNIX98 
433/* Determine level of concurrency. */ 
434extern int pthread_getconcurrency (void) __THROW; 
435 
436/* Set new concurrency level to LEVEL. */ 
437extern int pthread_setconcurrency (int __level) __THROW; 
438#endif 
439 
440#ifdef __USE_GNU 
441/* Yield the processor to another thread or process. 
442 This function is similar to the POSIX `sched_yield' function but 
443 might be differently implemented in the case of a m-on-n thread 
444 implementation. */ 
445extern int pthread_yield (void) __THROW; 
446 
447 
448/* Limit specified thread TH to run only on the processors represented 
449 in CPUSET. */ 
450extern int pthread_setaffinity_np (pthread_t __th, size_t __cpusetsize, 
451 const cpu_set_t *__cpuset) 
452 __THROW __nonnull ((3)); 
453 
454/* Get bit set in CPUSET representing the processors TH can run on. */ 
455extern int pthread_getaffinity_np (pthread_t __th, size_t __cpusetsize, 
456 cpu_set_t *__cpuset) 
457 __THROW __nonnull ((3)); 
458#endif 
459 
460 
461/* Functions for handling initialization. */ 
462 
463/* Guarantee that the initialization function INIT_ROUTINE will be called 
464 only once, even if pthread_once is executed several times with the 
465 same ONCE_CONTROL argument. ONCE_CONTROL must point to a static or 
466 extern variable initialized to PTHREAD_ONCE_INIT. 
467 
468 The initialization functions might throw exception which is why 
469 this function is not marked with __THROW. */ 
470extern int pthread_once (pthread_once_t *__once_control, 
471 void (*__init_routine) (void)) __nonnull ((1, 2)); 
472 
473 
474/* Functions for handling cancellation. 
475 
476 Note that these functions are explicitly not marked to not throw an 
477 exception in C++ code. If cancellation is implemented by unwinding 
478 this is necessary to have the compiler generate the unwind information. */ 
479 
480/* Set cancelability state of current thread to STATE, returning old 
481 state in *OLDSTATE if OLDSTATE is not NULL. */ 
482extern int pthread_setcancelstate (int __state, int *__oldstate); 
483 
484/* Set cancellation state of current thread to TYPE, returning the old 
485 type in *OLDTYPE if OLDTYPE is not NULL. */ 
486extern int pthread_setcanceltype (int __type, int *__oldtype); 
487 
488/* Cancel THREAD immediately or at the next possibility. */ 
489extern int pthread_cancel (pthread_t __th); 
490 
491/* Test for pending cancellation for the current thread and terminate 
492 the thread as per pthread_exit(PTHREAD_CANCELED) if it has been 
493 cancelled. */ 
494extern void pthread_testcancel (void); 
495 
496 
497/* Cancellation handling with integration into exception handling. */ 
498 
499typedef struct 
500{ 
501 struct 
502 { 
503 __jmp_buf __cancel_jmp_buf; 
504 int __mask_was_saved; 
505 } __cancel_jmp_buf[1]; 
506 void *__pad[4]; 
507} __pthread_unwind_buf_t __attribute__ ((__aligned__)); 
508 
509/* No special attributes by default. */ 
510#ifndef __cleanup_fct_attribute 
511# define __cleanup_fct_attribute 
512#endif 
513 
514 
515/* Structure to hold the cleanup handler information. */ 
516struct __pthread_cleanup_frame 
517{ 
518 void (*__cancel_routine) (void *); 
519 void *__cancel_arg; 
520 int __do_it; 
521 int __cancel_type; 
522}; 
523 
524#if defined __GNUC__ && defined __EXCEPTIONS 
525# ifdef __cplusplus 
526/* Class to handle cancellation handler invocation. */ 
527class __pthread_cleanup_class 
528{ 
529 void (*__cancel_routine) (void *); 
530 void *__cancel_arg; 
531 int __do_it; 
532 int __cancel_type; 
533 
534 public: 
535 __pthread_cleanup_class (void (*__fct) (void *), void *__arg) 
536 : __cancel_routine (__fct), __cancel_arg (__arg), __do_it (1) { } 
537 ~__pthread_cleanup_class () { if (__do_it) __cancel_routine (__cancel_arg); } 
538 void __setdoit (int __newval) { __do_it = __newval; } 
539 void __defer () { pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED, 
540 &__cancel_type); } 
541 void __restore () const { pthread_setcanceltype (__cancel_type, 0); } 
542}; 
543 
544/* Install a cleanup handler: ROUTINE will be called with arguments ARG 
545 when the thread is canceled or calls pthread_exit. ROUTINE will also 
546 be called with arguments ARG when the matching pthread_cleanup_pop 
547 is executed with non-zero EXECUTE argument. 
548 
549 pthread_cleanup_push and pthread_cleanup_pop are macros and must always 
550 be used in matching pairs at the same nesting level of braces. */ 
551# define pthread_cleanup_push(routine, arg) \ 
552 do { \ 
553 __pthread_cleanup_class __clframe (routine, arg) 
554 
555/* Remove a cleanup handler installed by the matching pthread_cleanup_push. 
556 If EXECUTE is non-zero, the handler function is called. */ 
557# define pthread_cleanup_pop(execute) \ 
558 __clframe.__setdoit (execute); \ 
559 } while (0) 
560 
561# ifdef __USE_GNU 
562/* Install a cleanup handler as pthread_cleanup_push does, but also 
563 saves the current cancellation type and sets it to deferred 
564 cancellation. */ 
565# define pthread_cleanup_push_defer_np(routine, arg) \ 
566 do { \ 
567 __pthread_cleanup_class __clframe (routine, arg); \ 
568 __clframe.__defer () 
569 
570/* Remove a cleanup handler as pthread_cleanup_pop does, but also 
571 restores the cancellation type that was in effect when the matching 
572 pthread_cleanup_push_defer was called. */ 
573# define pthread_cleanup_pop_restore_np(execute) \ 
574 __clframe.__restore (); \ 
575 __clframe.__setdoit (execute); \ 
576 } while (0) 
577# endif 
578# else 
579/* Function called to call the cleanup handler. As an extern inline 
580 function the compiler is free to decide inlining the change when 
581 needed or fall back on the copy which must exist somewhere 
582 else. */ 
583__extern_inline void 
584__pthread_cleanup_routine (struct __pthread_cleanup_frame *__frame) 
585{ 
586 if (__frame->__do_it) 
587 __frame->__cancel_routine (__frame->__cancel_arg); 
588} 
589 
590/* Install a cleanup handler: ROUTINE will be called with arguments ARG 
591 when the thread is canceled or calls pthread_exit. ROUTINE will also 
592 be called with arguments ARG when the matching pthread_cleanup_pop 
593 is executed with non-zero EXECUTE argument. 
594 
595 pthread_cleanup_push and pthread_cleanup_pop are macros and must always 
596 be used in matching pairs at the same nesting level of braces. */ 
597# define pthread_cleanup_push(routine, arg) \ 
598 do { \ 
599 struct __pthread_cleanup_frame __clframe \ 
600 __attribute__ ((__cleanup__ (__pthread_cleanup_routine))) \ 
601 = { .__cancel_routine = (routine), .__cancel_arg = (arg), \ 
602 .__do_it = 1 }; 
603 
604/* Remove a cleanup handler installed by the matching pthread_cleanup_push. 
605 If EXECUTE is non-zero, the handler function is called. */ 
606# define pthread_cleanup_pop(execute) \ 
607 __clframe.__do_it = (execute); \ 
608 } while (0) 
609 
610# ifdef __USE_GNU 
611/* Install a cleanup handler as pthread_cleanup_push does, but also 
612 saves the current cancellation type and sets it to deferred 
613 cancellation. */ 
614# define pthread_cleanup_push_defer_np(routine, arg) \ 
615 do { \ 
616 struct __pthread_cleanup_frame __clframe \ 
617 __attribute__ ((__cleanup__ (__pthread_cleanup_routine))) \ 
618 = { .__cancel_routine = (routine), .__cancel_arg = (arg), \ 
619 .__do_it = 1 }; \ 
620 (void) pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED, \ 
621 &__clframe.__cancel_type) 
622 
623/* Remove a cleanup handler as pthread_cleanup_pop does, but also 
624 restores the cancellation type that was in effect when the matching 
625 pthread_cleanup_push_defer was called. */ 
626# define pthread_cleanup_pop_restore_np(execute) \ 
627 (void) pthread_setcanceltype (__clframe.__cancel_type, NULL); \ 
628 __clframe.__do_it = (execute); \ 
629 } while (0) 
630# endif 
631# endif 
632#else 
633/* Install a cleanup handler: ROUTINE will be called with arguments ARG 
634 when the thread is canceled or calls pthread_exit. ROUTINE will also 
635 be called with arguments ARG when the matching pthread_cleanup_pop 
636 is executed with non-zero EXECUTE argument. 
637 
638 pthread_cleanup_push and pthread_cleanup_pop are macros and must always 
639 be used in matching pairs at the same nesting level of braces. */ 
640# define pthread_cleanup_push(routine, arg) \ 
641 do { \ 
642 __pthread_unwind_buf_t __cancel_buf; \ 
643 void (*__cancel_routine) (void *) = (routine); \ 
644 void *__cancel_arg = (arg); \ 
645 int __not_first_call = __sigsetjmp ((struct __jmp_buf_tag *) (void *) \ 
646 __cancel_buf.__cancel_jmp_buf, 0); \ 
647 if (__glibc_unlikely (__not_first_call)) \ 
648 { \ 
649 __cancel_routine (__cancel_arg); \ 
650 __pthread_unwind_next (&__cancel_buf); \ 
651 /* NOTREACHED */ \ 
652 } \ 
653 \ 
654 __pthread_register_cancel (&__cancel_buf); \ 
655 do { 
656extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf) 
657 __cleanup_fct_attribute; 
658 
659/* Remove a cleanup handler installed by the matching pthread_cleanup_push. 
660 If EXECUTE is non-zero, the handler function is called. */ 
661# define pthread_cleanup_pop(execute) \ 
662 do { } while (0);/* Empty to allow label before pthread_cleanup_pop. */\ 
663 } while (0); \ 
664 __pthread_unregister_cancel (&__cancel_buf); \ 
665 if (execute) \ 
666 __cancel_routine (__cancel_arg); \ 
667 } while (0) 
668extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf) 
669 __cleanup_fct_attribute; 
670 
671# ifdef __USE_GNU 
672/* Install a cleanup handler as pthread_cleanup_push does, but also 
673 saves the current cancellation type and sets it to deferred 
674 cancellation. */ 
675# define pthread_cleanup_push_defer_np(routine, arg) \ 
676 do { \ 
677 __pthread_unwind_buf_t __cancel_buf; \ 
678 void (*__cancel_routine) (void *) = (routine); \ 
679 void *__cancel_arg = (arg); \ 
680 int __not_first_call = __sigsetjmp ((struct __jmp_buf_tag *) (void *) \ 
681 __cancel_buf.__cancel_jmp_buf, 0); \ 
682 if (__glibc_unlikely (__not_first_call)) \ 
683 { \ 
684 __cancel_routine (__cancel_arg); \ 
685 __pthread_unwind_next (&__cancel_buf); \ 
686 /* NOTREACHED */ \ 
687 } \ 
688 \ 
689 __pthread_register_cancel_defer (&__cancel_buf); \ 
690 do { 
691extern void __pthread_register_cancel_defer (__pthread_unwind_buf_t *__buf) 
692 __cleanup_fct_attribute; 
693 
694/* Remove a cleanup handler as pthread_cleanup_pop does, but also 
695 restores the cancellation type that was in effect when the matching 
696 pthread_cleanup_push_defer was called. */ 
697# define pthread_cleanup_pop_restore_np(execute) \ 
698 do { } while (0);/* Empty to allow label before pthread_cleanup_pop. */\ 
699 } while (0); \ 
700 __pthread_unregister_cancel_restore (&__cancel_buf); \ 
701 if (execute) \ 
702 __cancel_routine (__cancel_arg); \ 
703 } while (0) 
704extern void __pthread_unregister_cancel_restore (__pthread_unwind_buf_t *__buf) 
705 __cleanup_fct_attribute; 
706# endif 
707 
708/* Internal interface to initiate cleanup. */ 
709extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf) 
710 __cleanup_fct_attribute __attribute__ ((__noreturn__)) 
711# ifndef SHARED 
712 __attribute__ ((__weak__)) 
713# endif 
714 ; 
715#endif 
716 
717/* Function used in the macros. */ 
718struct __jmp_buf_tag; 
719extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask) __THROWNL; 
720 
721 
722/* Mutex handling. */ 
723 
724/* Initialize a mutex. */ 
725extern int pthread_mutex_init (pthread_mutex_t *__mutex, 
726 const pthread_mutexattr_t *__mutexattr) 
727 __THROW __nonnull ((1)); 
728 
729/* Destroy a mutex. */ 
730extern int pthread_mutex_destroy (pthread_mutex_t *__mutex) 
731 __THROW __nonnull ((1)); 
732 
733/* Try locking a mutex. */ 
734extern int pthread_mutex_trylock (pthread_mutex_t *__mutex) 
735 __THROWNL __nonnull ((1)); 
736 
737/* Lock a mutex. */ 
738extern int pthread_mutex_lock (pthread_mutex_t *__mutex) 
739 __THROWNL __nonnull ((1)); 
740 
741#ifdef __USE_XOPEN2K 
742/* Wait until lock becomes available, or specified time passes. */ 
743extern int pthread_mutex_timedlock (pthread_mutex_t *__restrict __mutex, 
744 const struct timespec *__restrict 
745 __abstime) __THROWNL __nonnull ((1, 2)); 
746#endif 
747 
748#ifdef __USE_GNU 
749extern int pthread_mutex_clocklock (pthread_mutex_t *__restrict __mutex, 
750 clockid_t __clockid, 
751 const struct timespec *__restrict 
752 __abstime) __THROWNL __nonnull ((1, 3)); 
753#endif 
754 
755/* Unlock a mutex. */ 
756extern int pthread_mutex_unlock (pthread_mutex_t *__mutex) 
757 __THROWNL __nonnull ((1)); 
758 
759 
760/* Get the priority ceiling of MUTEX. */ 
761extern int pthread_mutex_getprioceiling (const pthread_mutex_t * 
762 __restrict __mutex, 
763 int *__restrict __prioceiling) 
764 __THROW __nonnull ((1, 2)); 
765 
766/* Set the priority ceiling of MUTEX to PRIOCEILING, return old 
767 priority ceiling value in *OLD_CEILING. */ 
768extern int pthread_mutex_setprioceiling (pthread_mutex_t *__restrict __mutex, 
769 int __prioceiling, 
770 int *__restrict __old_ceiling) 
771 __THROW __nonnull ((1, 3)); 
772 
773 
774#ifdef __USE_XOPEN2K8 
775/* Declare the state protected by MUTEX as consistent. */ 
776extern int pthread_mutex_consistent (pthread_mutex_t *__mutex) 
777 __THROW __nonnull ((1)); 
778# ifdef __USE_GNU 
779extern int pthread_mutex_consistent_np (pthread_mutex_t *__mutex) 
780 __THROW __nonnull ((1)); 
781# endif 
782#endif 
783 
784 
785/* Functions for handling mutex attributes. */ 
786 
787/* Initialize mutex attribute object ATTR with default attributes 
788 (kind is PTHREAD_MUTEX_TIMED_NP). */ 
789extern int pthread_mutexattr_init (pthread_mutexattr_t *__attr) 
790 __THROW __nonnull ((1)); 
791 
792/* Destroy mutex attribute object ATTR. */ 
793extern int pthread_mutexattr_destroy (pthread_mutexattr_t *__attr) 
794 __THROW __nonnull ((1)); 
795 
796/* Get the process-shared flag of the mutex attribute ATTR. */ 
797extern int pthread_mutexattr_getpshared (const pthread_mutexattr_t * 
798 __restrict __attr, 
799 int *__restrict __pshared) 
800 __THROW __nonnull ((1, 2)); 
801 
802/* Set the process-shared flag of the mutex attribute ATTR. */ 
803extern int pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr, 
804 int __pshared) 
805 __THROW __nonnull ((1)); 
806 
807#if defined __USE_UNIX98 || defined __USE_XOPEN2K8 
808/* Return in *KIND the mutex kind attribute in *ATTR. */ 
809extern int pthread_mutexattr_gettype (const pthread_mutexattr_t *__restrict 
810 __attr, int *__restrict __kind) 
811 __THROW __nonnull ((1, 2)); 
812 
813/* Set the mutex kind attribute in *ATTR to KIND (either PTHREAD_MUTEX_NORMAL, 
814 PTHREAD_MUTEX_RECURSIVE, PTHREAD_MUTEX_ERRORCHECK, or 
815 PTHREAD_MUTEX_DEFAULT). */ 
816extern int pthread_mutexattr_settype (pthread_mutexattr_t *__attr, int __kind) 
817 __THROW __nonnull ((1)); 
818#endif 
819 
820/* Return in *PROTOCOL the mutex protocol attribute in *ATTR. */ 
821extern int pthread_mutexattr_getprotocol (const pthread_mutexattr_t * 
822 __restrict __attr, 
823 int *__restrict __protocol) 
824 __THROW __nonnull ((1, 2)); 
825 
826/* Set the mutex protocol attribute in *ATTR to PROTOCOL (either 
827 PTHREAD_PRIO_NONE, PTHREAD_PRIO_INHERIT, or PTHREAD_PRIO_PROTECT). */ 
828extern int pthread_mutexattr_setprotocol (pthread_mutexattr_t *__attr, 
829 int __protocol) 
830 __THROW __nonnull ((1)); 
831 
832/* Return in *PRIOCEILING the mutex prioceiling attribute in *ATTR. */ 
833extern int pthread_mutexattr_getprioceiling (const pthread_mutexattr_t * 
834 __restrict __attr, 
835 int *__restrict __prioceiling) 
836 __THROW __nonnull ((1, 2)); 
837 
838/* Set the mutex prioceiling attribute in *ATTR to PRIOCEILING. */ 
839extern int pthread_mutexattr_setprioceiling (pthread_mutexattr_t *__attr, 
840 int __prioceiling) 
841 __THROW __nonnull ((1)); 
842 
843#ifdef __USE_XOPEN2K 
844/* Get the robustness flag of the mutex attribute ATTR. */ 
845extern int pthread_mutexattr_getrobust (const pthread_mutexattr_t *__attr, 
846 int *__robustness) 
847 __THROW __nonnull ((1, 2)); 
848# ifdef __USE_GNU 
849extern int pthread_mutexattr_getrobust_np (const pthread_mutexattr_t *__attr, 
850 int *__robustness) 
851 __THROW __nonnull ((1, 2)); 
852# endif 
853 
854/* Set the robustness flag of the mutex attribute ATTR. */ 
855extern int pthread_mutexattr_setrobust (pthread_mutexattr_t *__attr, 
856 int __robustness) 
857 __THROW __nonnull ((1)); 
858# ifdef __USE_GNU 
859extern int pthread_mutexattr_setrobust_np (pthread_mutexattr_t *__attr, 
860 int __robustness) 
861 __THROW __nonnull ((1)); 
862# endif 
863#endif 
864 
865 
866#if defined __USE_UNIX98 || defined __USE_XOPEN2K 
867/* Functions for handling read-write locks. */ 
868 
869/* Initialize read-write lock RWLOCK using attributes ATTR, or use 
870 the default values if later is NULL. */ 
871extern int pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock, 
872 const pthread_rwlockattr_t *__restrict 
873 __attr) __THROW __nonnull ((1)); 
874 
875/* Destroy read-write lock RWLOCK. */ 
876extern int pthread_rwlock_destroy (pthread_rwlock_t *__rwlock) 
877 __THROW __nonnull ((1)); 
878 
879/* Acquire read lock for RWLOCK. */ 
880extern int pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock) 
881 __THROWNL __nonnull ((1)); 
882 
883/* Try to acquire read lock for RWLOCK. */ 
884extern int pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock) 
885 __THROWNL __nonnull ((1)); 
886 
887# ifdef __USE_XOPEN2K 
888/* Try to acquire read lock for RWLOCK or return after specfied time. */ 
889extern int pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock, 
890 const struct timespec *__restrict 
891 __abstime) __THROWNL __nonnull ((1, 2)); 
892# endif 
893 
894# ifdef __USE_GNU 
895extern int pthread_rwlock_clockrdlock (pthread_rwlock_t *__restrict __rwlock, 
896 clockid_t __clockid, 
897 const struct timespec *__restrict 
898 __abstime) __THROWNL __nonnull ((1, 3)); 
899# endif 
900 
901/* Acquire write lock for RWLOCK. */ 
902extern int pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock) 
903 __THROWNL __nonnull ((1)); 
904 
905/* Try to acquire write lock for RWLOCK. */ 
906extern int pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock) 
907 __THROWNL __nonnull ((1)); 
908 
909# ifdef __USE_XOPEN2K 
910/* Try to acquire write lock for RWLOCK or return after specfied time. */ 
911extern int pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock, 
912 const struct timespec *__restrict 
913 __abstime) __THROWNL __nonnull ((1, 2)); 
914# endif 
915 
916# ifdef __USE_GNU 
917extern int pthread_rwlock_clockwrlock (pthread_rwlock_t *__restrict __rwlock, 
918 clockid_t __clockid, 
919 const struct timespec *__restrict 
920 __abstime) __THROWNL __nonnull ((1, 3)); 
921# endif 
922 
923/* Unlock RWLOCK. */ 
924extern int pthread_rwlock_unlock (pthread_rwlock_t *__rwlock) 
925 __THROWNL __nonnull ((1)); 
926 
927 
928/* Functions for handling read-write lock attributes. */ 
929 
930/* Initialize attribute object ATTR with default values. */ 
931extern int pthread_rwlockattr_init (pthread_rwlockattr_t *__attr) 
932 __THROW __nonnull ((1)); 
933 
934/* Destroy attribute object ATTR. */ 
935extern int pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr) 
936 __THROW __nonnull ((1)); 
937 
938/* Return current setting of process-shared attribute of ATTR in PSHARED. */ 
939extern int pthread_rwlockattr_getpshared (const pthread_rwlockattr_t * 
940 __restrict __attr, 
941 int *__restrict __pshared) 
942 __THROW __nonnull ((1, 2)); 
943 
944/* Set process-shared attribute of ATTR to PSHARED. */ 
945extern int pthread_rwlockattr_setpshared (pthread_rwlockattr_t *__attr, 
946 int __pshared) 
947 __THROW __nonnull ((1)); 
948 
949/* Return current setting of reader/writer preference. */ 
950extern int pthread_rwlockattr_getkind_np (const pthread_rwlockattr_t * 
951 __restrict __attr, 
952 int *__restrict __pref) 
953 __THROW __nonnull ((1, 2)); 
954 
955/* Set reader/write preference. */ 
956extern int pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *__attr, 
957 int __pref) __THROW __nonnull ((1)); 
958#endif 
959 
960 
961/* Functions for handling conditional variables. */ 
962 
963/* Initialize condition variable COND using attributes ATTR, or use 
964 the default values if later is NULL. */ 
965extern int pthread_cond_init (pthread_cond_t *__restrict __cond, 
966 const pthread_condattr_t *__restrict __cond_attr) 
967 __THROW __nonnull ((1)); 
968 
969/* Destroy condition variable COND. */ 
970extern int pthread_cond_destroy (pthread_cond_t *__cond) 
971 __THROW __nonnull ((1)); 
972 
973/* Wake up one thread waiting for condition variable COND. */ 
974extern int pthread_cond_signal (pthread_cond_t *__cond) 
975 __THROWNL __nonnull ((1)); 
976 
977/* Wake up all threads waiting for condition variables COND. */ 
978extern int pthread_cond_broadcast (pthread_cond_t *__cond) 
979 __THROWNL __nonnull ((1)); 
980 
981/* Wait for condition variable COND to be signaled or broadcast. 
982 MUTEX is assumed to be locked before. 
983 
984 This function is a cancellation point and therefore not marked with 
985 __THROW. */ 
986extern int pthread_cond_wait (pthread_cond_t *__restrict __cond, 
987 pthread_mutex_t *__restrict __mutex) 
988 __nonnull ((1, 2)); 
989 
990/* Wait for condition variable COND to be signaled or broadcast until 
991 ABSTIME. MUTEX is assumed to be locked before. ABSTIME is an 
992 absolute time specification; zero is the beginning of the epoch 
993 (00:00:00 GMT, January 1, 1970). 
994 
995 This function is a cancellation point and therefore not marked with 
996 __THROW. */ 
997extern int pthread_cond_timedwait (pthread_cond_t *__restrict __cond, 
998 pthread_mutex_t *__restrict __mutex, 
999 const struct timespec *__restrict __abstime) 
1000 __nonnull ((1, 2, 3)); 
1001 
1002# ifdef __USE_GNU 
1003/* Wait for condition variable COND to be signaled or broadcast until 
1004 ABSTIME measured by the specified clock. MUTEX is assumed to be 
1005 locked before. CLOCK is the clock to use. ABSTIME is an absolute 
1006 time specification against CLOCK's epoch. 
1007 
1008 This function is a cancellation point and therefore not marked with 
1009 __THROW. */ 
1010extern int pthread_cond_clockwait (pthread_cond_t *__restrict __cond, 
1011 pthread_mutex_t *__restrict __mutex, 
1012 __clockid_t __clock_id, 
1013 const struct timespec *__restrict __abstime) 
1014 __nonnull ((1, 2, 4)); 
1015# endif 
1016 
1017/* Functions for handling condition variable attributes. */ 
1018 
1019/* Initialize condition variable attribute ATTR. */ 
1020extern int pthread_condattr_init (pthread_condattr_t *__attr) 
1021 __THROW __nonnull ((1)); 
1022 
1023/* Destroy condition variable attribute ATTR. */ 
1024extern int pthread_condattr_destroy (pthread_condattr_t *__attr) 
1025 __THROW __nonnull ((1)); 
1026 
1027/* Get the process-shared flag of the condition variable attribute ATTR. */ 
1028extern int pthread_condattr_getpshared (const pthread_condattr_t * 
1029 __restrict __attr, 
1030 int *__restrict __pshared) 
1031 __THROW __nonnull ((1, 2)); 
1032 
1033/* Set the process-shared flag of the condition variable attribute ATTR. */ 
1034extern int pthread_condattr_setpshared (pthread_condattr_t *__attr, 
1035 int __pshared) __THROW __nonnull ((1)); 
1036 
1037#ifdef __USE_XOPEN2K 
1038/* Get the clock selected for the condition variable attribute ATTR. */ 
1039extern int pthread_condattr_getclock (const pthread_condattr_t * 
1040 __restrict __attr, 
1041 __clockid_t *__restrict __clock_id) 
1042 __THROW __nonnull ((1, 2)); 
1043 
1044/* Set the clock selected for the condition variable attribute ATTR. */ 
1045extern int pthread_condattr_setclock (pthread_condattr_t *__attr, 
1046 __clockid_t __clock_id) 
1047 __THROW __nonnull ((1)); 
1048#endif 
1049 
1050 
1051#ifdef __USE_XOPEN2K 
1052/* Functions to handle spinlocks. */ 
1053 
1054/* Initialize the spinlock LOCK. If PSHARED is nonzero the spinlock can 
1055 be shared between different processes. */ 
1056extern int pthread_spin_init (pthread_spinlock_t *__lock, int __pshared) 
1057 __THROW __nonnull ((1)); 
1058 
1059/* Destroy the spinlock LOCK. */ 
1060extern int pthread_spin_destroy (pthread_spinlock_t *__lock) 
1061 __THROW __nonnull ((1)); 
1062 
1063/* Wait until spinlock LOCK is retrieved. */ 
1064extern int pthread_spin_lock (pthread_spinlock_t *__lock) 
1065 __THROWNL __nonnull ((1)); 
1066 
1067/* Try to lock spinlock LOCK. */ 
1068extern int pthread_spin_trylock (pthread_spinlock_t *__lock) 
1069 __THROWNL __nonnull ((1)); 
1070 
1071/* Release spinlock LOCK. */ 
1072extern int pthread_spin_unlock (pthread_spinlock_t *__lock) 
1073 __THROWNL __nonnull ((1)); 
1074 
1075 
1076/* Functions to handle barriers. */ 
1077 
1078/* Initialize BARRIER with the attributes in ATTR. The barrier is 
1079 opened when COUNT waiters arrived. */ 
1080extern int pthread_barrier_init (pthread_barrier_t *__restrict __barrier, 
1081 const pthread_barrierattr_t *__restrict 
1082 __attr, unsigned int __count) 
1083 __THROW __nonnull ((1)); 
1084 
1085/* Destroy a previously dynamically initialized barrier BARRIER. */ 
1086extern int pthread_barrier_destroy (pthread_barrier_t *__barrier) 
1087 __THROW __nonnull ((1)); 
1088 
1089/* Wait on barrier BARRIER. */ 
1090extern int pthread_barrier_wait (pthread_barrier_t *__barrier) 
1091 __THROWNL __nonnull ((1)); 
1092 
1093 
1094/* Initialize barrier attribute ATTR. */ 
1095extern int pthread_barrierattr_init (pthread_barrierattr_t *__attr) 
1096 __THROW __nonnull ((1)); 
1097 
1098/* Destroy previously dynamically initialized barrier attribute ATTR. */ 
1099extern int pthread_barrierattr_destroy (pthread_barrierattr_t *__attr) 
1100 __THROW __nonnull ((1)); 
1101 
1102/* Get the process-shared flag of the barrier attribute ATTR. */ 
1103extern int pthread_barrierattr_getpshared (const pthread_barrierattr_t * 
1104 __restrict __attr, 
1105 int *__restrict __pshared) 
1106 __THROW __nonnull ((1, 2)); 
1107 
1108/* Set the process-shared flag of the barrier attribute ATTR. */ 
1109extern int pthread_barrierattr_setpshared (pthread_barrierattr_t *__attr, 
1110 int __pshared) 
1111 __THROW __nonnull ((1)); 
1112#endif 
1113 
1114 
1115/* Functions for handling thread-specific data. */ 
1116 
1117/* Create a key value identifying a location in the thread-specific 
1118 data area. Each thread maintains a distinct thread-specific data 
1119 area. DESTR_FUNCTION, if non-NULL, is called with the value 
1120 associated to that key when the key is destroyed. 
1121 DESTR_FUNCTION is not called if the value associated is NULL when 
1122 the key is destroyed. */ 
1123extern int pthread_key_create (pthread_key_t *__key, 
1124 void (*__destr_function) (void *)) 
1125 __THROW __nonnull ((1)); 
1126 
1127/* Destroy KEY. */ 
1128extern int pthread_key_delete (pthread_key_t __key) __THROW; 
1129 
1130/* Return current value of the thread-specific data slot identified by KEY. */ 
1131extern void *pthread_getspecific (pthread_key_t __key) __THROW; 
1132 
1133/* Store POINTER in the thread-specific data slot identified by KEY. */ 
1134extern int pthread_setspecific (pthread_key_t __key, 
1135 const void *__pointer) __THROW ; 
1136 
1137 
1138#ifdef __USE_XOPEN2K 
1139/* Get ID of CPU-time clock for thread THREAD_ID. */ 
1140extern int pthread_getcpuclockid (pthread_t __thread_id, 
1141 __clockid_t *__clock_id) 
1142 __THROW __nonnull ((2)); 
1143#endif 
1144 
1145 
1146/* Install handlers to be called when a new process is created with FORK. 
1147 The PREPARE handler is called in the parent process just before performing 
1148 FORK. The PARENT handler is called in the parent process just after FORK. 
1149 The CHILD handler is called in the child process. Each of the three 
1150 handlers can be NULL, meaning that no handler needs to be called at that 
1151 point. 
1152 PTHREAD_ATFORK can be called several times, in which case the PREPARE 
1153 handlers are called in LIFO order (last added with PTHREAD_ATFORK, 
1154 first called before FORK), and the PARENT and CHILD handlers are called 
1155 in FIFO (first added, first called). */ 
1156 
1157extern int pthread_atfork (void (*__prepare) (void), 
1158 void (*__parent) (void), 
1159 void (*__child) (void)) __THROW; 
1160 
1161 
1162#ifdef __USE_EXTERN_INLINES 
1163/* Optimizations. */ 
1164__extern_inline int 
1165__NTH (pthread_equal (pthread_t __thread1, pthread_t __thread2)) 
1166{ 
1167 return __thread1 == __thread2; 
1168} 
1169#endif 
1170 
1171__END_DECLS 
1172 
1173#endif /* pthread.h */ 
1174