nptl/pthreadP.h

   1 /* Copyright (C) 2002-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _PTHREADP_H
  20 #define _PTHREADP_H     1
  21
  22 #define __PTHREAD_NPTL
  23
  24 #include <pthread.h>
  25 #include <setjmp.h>
  26 #include <stdbool.h>
  27 #include <sys/syscall.h>
  28 #include "descr.h"
  29 #include <tls.h>
  30 #include <lowlevellock.h>
  31 #include <stackinfo.h>
  32 #include <internaltypes.h>
  33 #include <pthread-functions.h>
  34 #include <atomic.h>
  35 #include <kernel-features.h>
  36 #include <errno.h>
  37 #include <internal-signals.h>
  38 #include "pthread_mutex_conf.h"
  39
  40
  41 /* Atomic operations on TLS memory.  */
  42 #ifndef THREAD_ATOMIC_CMPXCHG_VAL
  43 # define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, new, old) \
  44   atomic_compare_and_exchange_val_acq (&(descr)->member, new, old)
  45 #endif
  46
  47 #ifndef THREAD_ATOMIC_BIT_SET
  48 # define THREAD_ATOMIC_BIT_SET(descr, member, bit) \
  49   atomic_bit_set (&(descr)->member, bit)
  50 #endif
  51
  52
  53 static inline short max_adaptive_count (void)
  54 {
  55 #if HAVE_TUNABLES
  56   return __mutex_aconf.spin_count;
  57 #else
  58   return DEFAULT_ADAPTIVE_COUNT;
  59 #endif
  60 }
  61
  62
  63 /* Magic cookie representing robust mutex with dead owner.  */
  64 #define PTHREAD_MUTEX_INCONSISTENT      INT_MAX
  65 /* Magic cookie representing not recoverable robust mutex.  */
  66 #define PTHREAD_MUTEX_NOTRECOVERABLE    (INT_MAX - 1)
  67
  68
  69 /* Internal mutex type value.  */
  70 enum
  71 {
  72   PTHREAD_MUTEX_KIND_MASK_NP = 3,
  73
  74   PTHREAD_MUTEX_ELISION_NP    = 256,
  75   PTHREAD_MUTEX_NO_ELISION_NP = 512,
  76
  77   PTHREAD_MUTEX_ROBUST_NORMAL_NP = 16,
  78   PTHREAD_MUTEX_ROBUST_RECURSIVE_NP
  79   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  80   PTHREAD_MUTEX_ROBUST_ERRORCHECK_NP
  81   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
  82   PTHREAD_MUTEX_ROBUST_ADAPTIVE_NP
  83   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
  84   PTHREAD_MUTEX_PRIO_INHERIT_NP = 32,
  85   PTHREAD_MUTEX_PI_NORMAL_NP
  86   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_NORMAL,
  87   PTHREAD_MUTEX_PI_RECURSIVE_NP
  88   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  89   PTHREAD_MUTEX_PI_ERRORCHECK_NP
  90   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
  91   PTHREAD_MUTEX_PI_ADAPTIVE_NP
  92   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
  93   PTHREAD_MUTEX_PI_ROBUST_NORMAL_NP
  94   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_NORMAL_NP,
  95   PTHREAD_MUTEX_PI_ROBUST_RECURSIVE_NP
  96   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_RECURSIVE_NP,
  97   PTHREAD_MUTEX_PI_ROBUST_ERRORCHECK_NP
  98   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_ERRORCHECK_NP,
  99   PTHREAD_MUTEX_PI_ROBUST_ADAPTIVE_NP
 100   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_ADAPTIVE_NP,
 101   PTHREAD_MUTEX_PRIO_PROTECT_NP = 64,
 102   PTHREAD_MUTEX_PP_NORMAL_NP
 103   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_NORMAL,
 104   PTHREAD_MUTEX_PP_RECURSIVE_NP
 105   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_RECURSIVE_NP,
 106   PTHREAD_MUTEX_PP_ERRORCHECK_NP
 107   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
 108   PTHREAD_MUTEX_PP_ADAPTIVE_NP
 109   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
 110   PTHREAD_MUTEX_ELISION_FLAGS_NP
 111   = PTHREAD_MUTEX_ELISION_NP | PTHREAD_MUTEX_NO_ELISION_NP,
 112
 113   PTHREAD_MUTEX_TIMED_ELISION_NP =
 114           PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_ELISION_NP,
 115   PTHREAD_MUTEX_TIMED_NO_ELISION_NP =
 116           PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_NO_ELISION_NP,
 117 };
 118 #define PTHREAD_MUTEX_PSHARED_BIT 128
 119
 120 /* See concurrency notes regarding __kind in struct __pthread_mutex_s
 121    in sysdeps/nptl/bits/thread-shared-types.h.  */
 122 #define PTHREAD_MUTEX_TYPE(m) \
 123   (atomic_load_relaxed (&((m)->__data.__kind)) & 127)
 124 /* Don't include NO_ELISION, as that type is always the same
 125    as the underlying lock type.  */
 126 #define PTHREAD_MUTEX_TYPE_ELISION(m) \
 127   (atomic_load_relaxed (&((m)->__data.__kind))  \
 128    & (127 | PTHREAD_MUTEX_ELISION_NP))
 129
 130 #if LLL_PRIVATE == 0 && LLL_SHARED == 128
 131 # define PTHREAD_MUTEX_PSHARED(m) \
 132   (atomic_load_relaxed (&((m)->__data.__kind)) & 128)
 133 #else
 134 # define PTHREAD_MUTEX_PSHARED(m) \
 135   ((atomic_load_relaxed (&((m)->__data.__kind)) & 128)  \
 136    ? LLL_SHARED : LLL_PRIVATE)
 137 #endif
 138
 139 /* The kernel when waking robust mutexes on exit never uses
 140    FUTEX_PRIVATE_FLAG FUTEX_WAKE.  */
 141 #define PTHREAD_ROBUST_MUTEX_PSHARED(m) LLL_SHARED
 142
 143 /* Ceiling in __data.__lock.  __data.__lock is signed, so don't
 144    use the MSB bit in there, but in the mask also include that bit,
 145    so that the compiler can optimize & PTHREAD_MUTEX_PRIO_CEILING_MASK
 146    masking if the value is then shifted down by
 147    PTHREAD_MUTEX_PRIO_CEILING_SHIFT.  */
 148 #define PTHREAD_MUTEX_PRIO_CEILING_SHIFT        19
 149 #define PTHREAD_MUTEX_PRIO_CEILING_MASK         0xfff80000
 150
 151
 152 /* Flags in mutex attr.  */
 153 #define PTHREAD_MUTEXATTR_PROTOCOL_SHIFT        28
 154 #define PTHREAD_MUTEXATTR_PROTOCOL_MASK         0x30000000
 155 #define PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT    12
 156 #define PTHREAD_MUTEXATTR_PRIO_CEILING_MASK     0x00fff000
 157 #define PTHREAD_MUTEXATTR_FLAG_ROBUST           0x40000000
 158 #define PTHREAD_MUTEXATTR_FLAG_PSHARED          0x80000000
 159 #define PTHREAD_MUTEXATTR_FLAG_BITS \
 160   (PTHREAD_MUTEXATTR_FLAG_ROBUST | PTHREAD_MUTEXATTR_FLAG_PSHARED \
 161    | PTHREAD_MUTEXATTR_PROTOCOL_MASK | PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
 162
 163
 164 /* For the following, see pthread_rwlock_common.c.  */
 165 #define PTHREAD_RWLOCK_WRPHASE          1
 166 #define PTHREAD_RWLOCK_WRLOCKED         2
 167 #define PTHREAD_RWLOCK_RWAITING         4
 168 #define PTHREAD_RWLOCK_READER_SHIFT     3
 169 #define PTHREAD_RWLOCK_READER_OVERFLOW  ((unsigned int) 1 \
 170                                          << (sizeof (unsigned int) * 8 - 1))
 171 #define PTHREAD_RWLOCK_WRHANDOVER       ((unsigned int) 1 \
 172                                          << (sizeof (unsigned int) * 8 - 1))
 173 #define PTHREAD_RWLOCK_FUTEX_USED       2
 174
 175
 176 /* Bits used in robust mutex implementation.  */
 177 #define FUTEX_WAITERS           0x80000000
 178 #define FUTEX_OWNER_DIED        0x40000000
 179 #define FUTEX_TID_MASK          0x3fffffff
 180
 181
 182 /* pthread_once definitions.  See __pthread_once for how these are used.  */
 183 #define __PTHREAD_ONCE_INPROGRESS       1
 184 #define __PTHREAD_ONCE_DONE             2
 185 #define __PTHREAD_ONCE_FORK_GEN_INCR    4
 186
 187 /* Attribute to indicate thread creation was issued from C11 thrd_create.  */
 188 #define ATTR_C11_THREAD ((void*)(uintptr_t)-1)
 189
 190
 191 /* Condition variable definitions.  See __pthread_cond_wait_common.
 192    Need to be defined here so there is one place from which
 193    nptl_lock_constants can grab them.  */
 194 #define __PTHREAD_COND_CLOCK_MONOTONIC_MASK 2
 195 #define __PTHREAD_COND_SHARED_MASK 1
 196
 197
 198 /* Internal variables.  */
 199
 200
 201 /* Default pthread attributes.  */
 202 extern struct pthread_attr __default_pthread_attr attribute_hidden;
 203 extern int __default_pthread_attr_lock attribute_hidden;
 204
 205 /* Size and alignment of static TLS block.  */
 206 extern size_t __static_tls_size attribute_hidden;
 207 extern size_t __static_tls_align_m1 attribute_hidden;
 208
 209 /* Flag whether the machine is SMP or not.  */
 210 extern int __is_smp attribute_hidden;
 211
 212 /* Thread descriptor handling.  */
 213 extern list_t __stack_user;
 214 hidden_proto (__stack_user)
 215
 216 /* Attribute handling.  */
 217 extern struct pthread_attr *__attr_list attribute_hidden;
 218 extern int __attr_list_lock attribute_hidden;
 219
 220 /* Concurrency handling.  */
 221 extern int __concurrency_level attribute_hidden;
 222
 223 /* Thread-local data key handling.  */
 224 extern struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX];
 225 hidden_proto (__pthread_keys)
 226
 227 /* Number of threads running.  */
 228 extern unsigned int __nptl_nthreads attribute_hidden;
 229
 230 #ifndef __ASSUME_SET_ROBUST_LIST
 231 /* Negative if we do not have the system call and we can use it.  */
 232 extern int __set_robust_list_avail attribute_hidden;
 233 #endif
 234
 235 /* Thread Priority Protection.  */
 236 extern int __sched_fifo_min_prio attribute_hidden;
 237 extern int __sched_fifo_max_prio attribute_hidden;
 238 extern void __init_sched_fifo_prio (void) attribute_hidden;
 239 extern int __pthread_tpp_change_priority (int prev_prio, int new_prio)
 240      attribute_hidden;
 241 extern int __pthread_current_priority (void) attribute_hidden;
 242
 243 /* The library can run in debugging mode where it performs a lot more
 244    tests.  */
 245 extern int __pthread_debug attribute_hidden;
 246 /** For now disable debugging support.  */
 247 #if 0
 248 # define DEBUGGING_P __builtin_expect (__pthread_debug, 0)
 249 # define INVALID_TD_P(pd) (DEBUGGING_P && __find_in_stack_list (pd) == NULL)
 250 # define INVALID_NOT_TERMINATED_TD_P(pd) INVALID_TD_P (pd)
 251 #else
 252 # define DEBUGGING_P 0
 253 /* Simplified test.  This will not catch all invalid descriptors but
 254    is better than nothing.  And if the test triggers the thread
 255    descriptor is guaranteed to be invalid.  */
 256 # define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0)
 257 # define INVALID_NOT_TERMINATED_TD_P(pd) __builtin_expect ((pd)->tid < 0, 0)
 258 #endif
 259
 260
 261 /* Cancellation test.  */
 262 #define CANCELLATION_P(self) \
 263   do {                                                                        \
 264     int cancelhandling = THREAD_GETMEM (self, cancelhandling);                \
 265     if (CANCEL_ENABLED_AND_CANCELED (cancelhandling))                         \
 266       {                                                                       \
 267         THREAD_SETMEM (self, result, PTHREAD_CANCELED);                       \
 268         __do_cancel ();                                                       \
 269       }                                                                       \
 270   } while (0)
 271
 272
 273 extern void __pthread_unwind (__pthread_unwind_buf_t *__buf)
 274      __cleanup_fct_attribute __attribute ((__noreturn__))
 275 #if !defined SHARED && !IS_IN (libpthread)
 276      weak_function
 277 #endif
 278      ;
 279 extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
 280      __cleanup_fct_attribute __attribute ((__noreturn__))
 281 #ifndef SHARED
 282      weak_function
 283 #endif
 284      ;
 285 extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
 286      __cleanup_fct_attribute;
 287 extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
 288      __cleanup_fct_attribute;
 289 #if IS_IN (libpthread)
 290 hidden_proto (__pthread_unwind)
 291 hidden_proto (__pthread_unwind_next)
 292 hidden_proto (__pthread_register_cancel)
 293 hidden_proto (__pthread_unregister_cancel)
 294 # ifdef SHARED
 295 extern void attribute_hidden pthread_cancel_init (void);
 296 # endif
 297 extern void __nptl_unwind_freeres (void) attribute_hidden;
 298 #endif
 299
 300
 301 /* Called when a thread reacts on a cancellation request.  */
 302 static inline void
 303 __attribute ((noreturn, always_inline))
 304 __do_cancel (void)
 305 {
 306   struct pthread *self = THREAD_SELF;
 307
 308   /* Make sure we get no more cancellations.  */
 309   THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT);
 310
 311   __pthread_unwind ((__pthread_unwind_buf_t *)
 312                     THREAD_GETMEM (self, cleanup_jmp_buf));
 313 }
 314
 315
 316 /* Internal prototypes.  */
 317
 318 /* Thread list handling.  */
 319 extern struct pthread *__find_in_stack_list (struct pthread *pd)
 320      attribute_hidden;
 321
 322 /* Deallocate a thread's stack after optionally making sure the thread
 323    descriptor is still valid.  */
 324 extern void __free_tcb (struct pthread *pd) attribute_hidden;
 325
 326 /* Free allocated stack.  */
 327 extern void __deallocate_stack (struct pthread *pd) attribute_hidden;
 328
 329 /* Mark all the stacks except for the current one as available.  This
 330    function also re-initializes the lock for the stack cache.  */
 331 extern void __reclaim_stacks (void) attribute_hidden;
 332
 333 /* Make all threads's stacks executable.  */
 334 extern int __make_stacks_executable (void **stack_endp) attribute_hidden;
 335
 336 /* longjmp handling.  */
 337 extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
 338 #if IS_IN (libpthread)
 339 hidden_proto (__pthread_cleanup_upto)
 340 #endif
 341
 342
 343 /* Functions with versioned interfaces.  */
 344 extern int __pthread_create_2_1 (pthread_t *newthread,
 345                                  const pthread_attr_t *attr,
 346                                  void *(*start_routine) (void *), void *arg);
 347 extern int __pthread_create_2_0 (pthread_t *newthread,
 348                                  const pthread_attr_t *attr,
 349                                  void *(*start_routine) (void *), void *arg);
 350 extern int __pthread_attr_init_2_1 (pthread_attr_t *attr);
 351 extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
 352
 353
 354 /* Event handlers for libthread_db interface.  */
 355 extern void __nptl_create_event (void);
 356 extern void __nptl_death_event (void);
 357 hidden_proto (__nptl_create_event)
 358 hidden_proto (__nptl_death_event)
 359
 360 /* Register the generation counter in the libpthread with the libc.  */
 361 #ifdef TLS_MULTIPLE_THREADS_IN_TCB
 362 extern void __libc_pthread_init (unsigned long int *ptr,
 363                                  void (*reclaim) (void),
 364                                  const struct pthread_functions *functions);
 365 #else
 366 extern int *__libc_pthread_init (unsigned long int *ptr,
 367                                  void (*reclaim) (void),
 368                                  const struct pthread_functions *functions);
 369
 370 /* Variable set to a nonzero value either if more than one thread runs or ran,
 371    or if a single-threaded process is trying to cancel itself.  See
 372    nptl/descr.h for more context on the single-threaded process case.  */
 373 extern int __pthread_multiple_threads attribute_hidden;
 374 /* Pointer to the corresponding variable in libc.  */
 375 extern int *__libc_multiple_threads_ptr attribute_hidden;
 376 #endif
 377
 378 extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
 379
 380 extern size_t __pthread_get_minstack (const pthread_attr_t *attr);
 381
 382 /* Namespace save aliases.  */
 383 extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
 384                                     struct sched_param *param);
 385 extern int __pthread_setschedparam (pthread_t thread_id, int policy,
 386                                     const struct sched_param *param);
 387 extern int __pthread_setcancelstate (int state, int *oldstate);
 388 extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 389                                  const pthread_mutexattr_t *__mutexattr);
 390 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 391 extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
 392 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
 393 extern int __pthread_mutex_timedlock (pthread_mutex_t *__mutex,
 394      const struct timespec *__abstime);
 395 extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
 396      attribute_hidden;
 397 extern void __pthread_mutex_cond_lock_adjust (pthread_mutex_t *__mutex)
 398      attribute_hidden;
 399 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 400 extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
 401                                            int __decr) attribute_hidden;
 402 extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
 403 extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
 404 extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
 405 extern int __pthread_attr_destroy (pthread_attr_t *attr);
 406 extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
 407                                           int *detachstate);
 408 extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
 409                                           int detachstate);
 410 extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
 411                                            int *inherit);
 412 extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
 413 extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
 414                                          struct sched_param *param);
 415 extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
 416                                          const struct sched_param *param);
 417 extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
 418                                           int *policy);
 419 extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
 420 extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
 421 extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
 422 extern int __pthread_attr_getstackaddr (const pthread_attr_t *__restrict
 423                                         __attr, void **__restrict __stackaddr);
 424 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 425                                         void *__stackaddr);
 426 extern int __pthread_attr_getstacksize (const pthread_attr_t *__restrict
 427                                         __attr,
 428                                         size_t *__restrict __stacksize);
 429 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 430                                         size_t __stacksize);
 431 extern int __pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
 432                                     void **__restrict __stackaddr,
 433                                     size_t *__restrict __stacksize);
 434 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 435                                     size_t __stacksize);
 436 extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
 437                                   const pthread_rwlockattr_t *__restrict
 438                                   __attr);
 439 extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
 440 extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
 441 extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
 442 extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
 443 extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
 444 extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
 445 extern int __pthread_cond_broadcast (pthread_cond_t *cond);
 446 extern int __pthread_cond_destroy (pthread_cond_t *cond);
 447 libc_hidden_proto (__pthread_cond_destroy)
 448 extern int __pthread_cond_init (pthread_cond_t *cond,
 449                                 const pthread_condattr_t *cond_attr);
 450 libc_hidden_proto (__pthread_cond_init)
 451 extern int __pthread_cond_signal (pthread_cond_t *cond);
 452 extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 453 extern int __pthread_cond_timedwait (pthread_cond_t *cond,
 454                                      pthread_mutex_t *mutex,
 455                                      const struct timespec *abstime);
 456 extern int __pthread_cond_clockwait (pthread_cond_t *cond,
 457                                      pthread_mutex_t *mutex,
 458                                      clockid_t clockid,
 459                                      const struct timespec *abstime)
 460   __nonnull ((1, 2, 4));
 461 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 462 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 463 extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
 464 extern int __pthread_key_delete (pthread_key_t key);
 465 extern void *__pthread_getspecific (pthread_key_t key);
 466 extern int __pthread_setspecific (pthread_key_t key, const void *value);
 467 extern int __pthread_once (pthread_once_t *once_control,
 468                            void (*init_routine) (void));
 469 extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
 470                              void (*child) (void));
 471 extern pthread_t __pthread_self (void);
 472 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
 473 extern int __pthread_detach (pthread_t th);
 474 extern int __pthread_cancel (pthread_t th);
 475 extern int __pthread_kill (pthread_t threadid, int signo);
 476 extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
 477 extern int __pthread_join (pthread_t threadid, void **thread_return);
 478 extern int __pthread_setcanceltype (int type, int *oldtype);
 479 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 480 extern void __pthread_disable_asynccancel (int oldtype) attribute_hidden;
 481 extern void __pthread_testcancel (void);
 482 extern int __pthread_clockjoin_ex (pthread_t, void **, clockid_t,
 483                                    const struct timespec *, bool)
 484   attribute_hidden;
 485
 486
 487 #if IS_IN (libpthread)
 488 hidden_proto (__pthread_mutex_init)
 489 hidden_proto (__pthread_mutex_destroy)
 490 hidden_proto (__pthread_mutex_lock)
 491 hidden_proto (__pthread_mutex_trylock)
 492 hidden_proto (__pthread_mutex_unlock)
 493 hidden_proto (__pthread_rwlock_rdlock)
 494 hidden_proto (__pthread_rwlock_wrlock)
 495 hidden_proto (__pthread_rwlock_unlock)
 496 hidden_proto (__pthread_key_create)
 497 hidden_proto (__pthread_getspecific)
 498 hidden_proto (__pthread_setspecific)
 499 hidden_proto (__pthread_once)
 500 hidden_proto (__pthread_setcancelstate)
 501 hidden_proto (__pthread_testcancel)
 502 hidden_proto (__pthread_mutexattr_init)
 503 hidden_proto (__pthread_mutexattr_settype)
 504 #endif
 505
 506 extern int __pthread_cond_broadcast_2_0 (pthread_cond_2_0_t *cond);
 507 extern int __pthread_cond_destroy_2_0 (pthread_cond_2_0_t *cond);
 508 extern int __pthread_cond_init_2_0 (pthread_cond_2_0_t *cond,
 509                                     const pthread_condattr_t *cond_attr);
 510 extern int __pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond);
 511 extern int __pthread_cond_timedwait_2_0 (pthread_cond_2_0_t *cond,
 512                                          pthread_mutex_t *mutex,
 513                                          const struct timespec *abstime);
 514 extern int __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond,
 515                                     pthread_mutex_t *mutex);
 516
 517 extern int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize,
 518                                      cpu_set_t *cpuset);
 519
 520 #if IS_IN (libpthread)
 521 /* Special versions which use non-exported functions.  */
 522 extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 523                                     void (*routine) (void *), void *arg)
 524      attribute_hidden;
 525
 526 /* Replace cleanup macros defined in <pthread.h> with internal
 527    versions that don't depend on unwind info and better support
 528    cancellation.  */
 529 # undef pthread_cleanup_push
 530 # define pthread_cleanup_push(routine,arg)              \
 531   { struct _pthread_cleanup_buffer _buffer;             \
 532   __pthread_cleanup_push (&_buffer, (routine), (arg));
 533
 534 extern void __pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 535                                    int execute) attribute_hidden;
 536 # undef pthread_cleanup_pop
 537 # define pthread_cleanup_pop(execute)                   \
 538   __pthread_cleanup_pop (&_buffer, (execute)); }
 539 #endif
 540
 541 extern void __pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 542                                           void (*routine) (void *), void *arg);
 543 extern void __pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 544                                            int execute);
 545
 546 /* Old cleanup interfaces, still used in libc.so.  */
 547 extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 548                                    void (*routine) (void *), void *arg);
 549 extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 550                                   int execute);
 551 extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 552                                          void (*routine) (void *), void *arg);
 553 extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 554                                           int execute);
 555
 556 extern void __nptl_deallocate_tsd (void) attribute_hidden;
 557
 558 extern void __nptl_setxid_error (struct xid_command *cmdp, int error)
 559   attribute_hidden;
 560 extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
 561 #ifndef SHARED
 562 extern void __nptl_set_robust (struct pthread *self);
 563 #endif
 564
 565 extern void __nptl_stacks_freeres (void) attribute_hidden;
 566 extern void __shm_directory_freeres (void) attribute_hidden;
 567
 568 extern void __wait_lookup_done (void) attribute_hidden;
 569
 570 #ifdef SHARED
 571 # define PTHREAD_STATIC_FN_REQUIRE(name)
 572 #else
 573 # define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
 574 #endif
 575
 576 /* Returns 0 if POL is a valid scheduling policy.  */
 577 static inline int
 578 check_sched_policy_attr (int pol)
 579 {
 580   if (pol == SCHED_OTHER || pol == SCHED_FIFO || pol == SCHED_RR)
 581     return 0;
 582
 583   return EINVAL;
 584 }
 585
 586 /* Returns 0 if PR is within the accepted range of priority values for
 587    the scheduling policy POL or EINVAL otherwise.  */
 588 static inline int
 589 check_sched_priority_attr (int pr, int pol)
 590 {
 591   int min = __sched_get_priority_min (pol);
 592   int max = __sched_get_priority_max (pol);
 593
 594   if (min >= 0 && max >= 0 && pr >= min && pr <= max)
 595     return 0;
 596
 597   return EINVAL;
 598 }
 599
 600 /* Returns 0 if ST is a valid stack size for a thread stack and EINVAL
 601    otherwise.  */
 602 static inline int
 603 check_stacksize_attr (size_t st)
 604 {
 605   if (st >= PTHREAD_STACK_MIN)
 606     return 0;
 607
 608   return EINVAL;
 609 }
 610
 611 #define ASSERT_TYPE_SIZE(type, size)                                    \
 612   _Static_assert (sizeof (type) == size,                                \
 613                   "sizeof (" #type ") != " #size)
 614
 615 #define ASSERT_PTHREAD_INTERNAL_SIZE(type, internal)                    \
 616   _Static_assert (sizeof ((type) { { 0 } }).__size >= sizeof (internal),\
 617                   "sizeof (" #type ".__size) < sizeof (" #internal ")")
 618
 619 #define ASSERT_PTHREAD_STRING(x) __STRING (x)
 620 #define ASSERT_PTHREAD_INTERNAL_OFFSET(type, member, offset)            \
 621   _Static_assert (offsetof (type, member) == offset,                    \
 622                   "offset of " #member " field of " #type " != "        \
 623                   ASSERT_PTHREAD_STRING (offset))
 624 #define ASSERT_PTHREAD_INTERNAL_MEMBER_SIZE(type, member, mtype)        \
 625   _Static_assert (sizeof (((type) { 0 }).member) != 8,  \
 626                   "sizeof (" #type "." #member ") != sizeof (" #mtype "))")
 627
 628 #endif  /* pthreadP.h */