nptl/pthreadP.h

   1 /* Copyright (C) 2002-2018 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _PTHREADP_H
  20 #define _PTHREADP_H     1
  21
  22 #include <pthread.h>
  23 #include <setjmp.h>
  24 #include <stdbool.h>
  25 #include <sys/syscall.h>
  26 #include "descr.h"
  27 #include <tls.h>
  28 #include <lowlevellock.h>
  29 #include <stackinfo.h>
  30 #include <internaltypes.h>
  31 #include <pthread-functions.h>
  32 #include <atomic.h>
  33 #include <kernel-features.h>
  34 #include <errno.h>
  35 #include <nptl-signals.h>
  36
  37
  38 /* Atomic operations on TLS memory.  */
  39 #ifndef THREAD_ATOMIC_CMPXCHG_VAL
  40 # define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, new, old) \
  41   atomic_compare_and_exchange_val_acq (&(descr)->member, new, old)
  42 #endif
  43
  44 #ifndef THREAD_ATOMIC_BIT_SET
  45 # define THREAD_ATOMIC_BIT_SET(descr, member, bit) \
  46   atomic_bit_set (&(descr)->member, bit)
  47 #endif
  48
  49
  50 /* Adaptive mutex definitions.  */
  51 #ifndef MAX_ADAPTIVE_COUNT
  52 # define MAX_ADAPTIVE_COUNT 100
  53 #endif
  54
  55
  56 /* Magic cookie representing robust mutex with dead owner.  */
  57 #define PTHREAD_MUTEX_INCONSISTENT      INT_MAX
  58 /* Magic cookie representing not recoverable robust mutex.  */
  59 #define PTHREAD_MUTEX_NOTRECOVERABLE    (INT_MAX - 1)
  60
  61
  62 /* Internal mutex type value.  */
  63 enum
  64 {
  65   PTHREAD_MUTEX_KIND_MASK_NP = 3,
  66
  67   PTHREAD_MUTEX_ELISION_NP    = 256,
  68   PTHREAD_MUTEX_NO_ELISION_NP = 512,
  69
  70   PTHREAD_MUTEX_ROBUST_NORMAL_NP = 16,
  71   PTHREAD_MUTEX_ROBUST_RECURSIVE_NP
  72   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  73   PTHREAD_MUTEX_ROBUST_ERRORCHECK_NP
  74   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
  75   PTHREAD_MUTEX_ROBUST_ADAPTIVE_NP
  76   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
  77   PTHREAD_MUTEX_PRIO_INHERIT_NP = 32,
  78   PTHREAD_MUTEX_PI_NORMAL_NP
  79   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_NORMAL,
  80   PTHREAD_MUTEX_PI_RECURSIVE_NP
  81   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  82   PTHREAD_MUTEX_PI_ERRORCHECK_NP
  83   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
  84   PTHREAD_MUTEX_PI_ADAPTIVE_NP
  85   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
  86   PTHREAD_MUTEX_PI_ROBUST_NORMAL_NP
  87   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_NORMAL_NP,
  88   PTHREAD_MUTEX_PI_ROBUST_RECURSIVE_NP
  89   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_RECURSIVE_NP,
  90   PTHREAD_MUTEX_PI_ROBUST_ERRORCHECK_NP
  91   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_ERRORCHECK_NP,
  92   PTHREAD_MUTEX_PI_ROBUST_ADAPTIVE_NP
  93   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_ADAPTIVE_NP,
  94   PTHREAD_MUTEX_PRIO_PROTECT_NP = 64,
  95   PTHREAD_MUTEX_PP_NORMAL_NP
  96   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_NORMAL,
  97   PTHREAD_MUTEX_PP_RECURSIVE_NP
  98   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  99   PTHREAD_MUTEX_PP_ERRORCHECK_NP
 100   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
 101   PTHREAD_MUTEX_PP_ADAPTIVE_NP
 102   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
 103   PTHREAD_MUTEX_ELISION_FLAGS_NP
 104   = PTHREAD_MUTEX_ELISION_NP | PTHREAD_MUTEX_NO_ELISION_NP,
 105
 106   PTHREAD_MUTEX_TIMED_ELISION_NP =
 107           PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_ELISION_NP,
 108   PTHREAD_MUTEX_TIMED_NO_ELISION_NP =
 109           PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_NO_ELISION_NP,
 110 };
 111 #define PTHREAD_MUTEX_PSHARED_BIT 128
 112
 113 #define PTHREAD_MUTEX_TYPE(m) \
 114   ((m)->__data.__kind & 127)
 115 /* Don't include NO_ELISION, as that type is always the same
 116    as the underlying lock type.  */
 117 #define PTHREAD_MUTEX_TYPE_ELISION(m) \
 118   ((m)->__data.__kind & (127|PTHREAD_MUTEX_ELISION_NP))
 119
 120 #if LLL_PRIVATE == 0 && LLL_SHARED == 128
 121 # define PTHREAD_MUTEX_PSHARED(m) \
 122   ((m)->__data.__kind & 128)
 123 #else
 124 # define PTHREAD_MUTEX_PSHARED(m) \
 125   (((m)->__data.__kind & 128) ? LLL_SHARED : LLL_PRIVATE)
 126 #endif
 127
 128 /* The kernel when waking robust mutexes on exit never uses
 129    FUTEX_PRIVATE_FLAG FUTEX_WAKE.  */
 130 #define PTHREAD_ROBUST_MUTEX_PSHARED(m) LLL_SHARED
 131
 132 /* Ceiling in __data.__lock.  __data.__lock is signed, so don't
 133    use the MSB bit in there, but in the mask also include that bit,
 134    so that the compiler can optimize & PTHREAD_MUTEX_PRIO_CEILING_MASK
 135    masking if the value is then shifted down by
 136    PTHREAD_MUTEX_PRIO_CEILING_SHIFT.  */
 137 #define PTHREAD_MUTEX_PRIO_CEILING_SHIFT        19
 138 #define PTHREAD_MUTEX_PRIO_CEILING_MASK         0xfff80000
 139
 140
 141 /* Flags in mutex attr.  */
 142 #define PTHREAD_MUTEXATTR_PROTOCOL_SHIFT        28
 143 #define PTHREAD_MUTEXATTR_PROTOCOL_MASK         0x30000000
 144 #define PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT    12
 145 #define PTHREAD_MUTEXATTR_PRIO_CEILING_MASK     0x00fff000
 146 #define PTHREAD_MUTEXATTR_FLAG_ROBUST           0x40000000
 147 #define PTHREAD_MUTEXATTR_FLAG_PSHARED          0x80000000
 148 #define PTHREAD_MUTEXATTR_FLAG_BITS \
 149   (PTHREAD_MUTEXATTR_FLAG_ROBUST | PTHREAD_MUTEXATTR_FLAG_PSHARED \
 150    | PTHREAD_MUTEXATTR_PROTOCOL_MASK | PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
 151
 152
 153 /* For the following, see pthread_rwlock_common.c.  */
 154 #define PTHREAD_RWLOCK_WRPHASE          1
 155 #define PTHREAD_RWLOCK_WRLOCKED         2
 156 #define PTHREAD_RWLOCK_RWAITING         4
 157 #define PTHREAD_RWLOCK_READER_SHIFT     3
 158 #define PTHREAD_RWLOCK_READER_OVERFLOW  ((unsigned int) 1 \
 159                                          << (sizeof (unsigned int) * 8 - 1))
 160 #define PTHREAD_RWLOCK_WRHANDOVER       ((unsigned int) 1 \
 161                                          << (sizeof (unsigned int) * 8 - 1))
 162 #define PTHREAD_RWLOCK_FUTEX_USED       2
 163
 164
 165 /* Bits used in robust mutex implementation.  */
 166 #define FUTEX_WAITERS           0x80000000
 167 #define FUTEX_OWNER_DIED        0x40000000
 168 #define FUTEX_TID_MASK          0x3fffffff
 169
 170
 171 /* pthread_once definitions.  See __pthread_once for how these are used.  */
 172 #define __PTHREAD_ONCE_INPROGRESS       1
 173 #define __PTHREAD_ONCE_DONE             2
 174 #define __PTHREAD_ONCE_FORK_GEN_INCR    4
 175
 176
 177 /* Condition variable definitions.  See __pthread_cond_wait_common.
 178    Need to be defined here so there is one place from which
 179    nptl_lock_constants can grab them.  */
 180 #define __PTHREAD_COND_CLOCK_MONOTONIC_MASK 2
 181 #define __PTHREAD_COND_SHARED_MASK 1
 182
 183
 184 /* Internal variables.  */
 185
 186
 187 /* Default pthread attributes.  */
 188 extern struct pthread_attr __default_pthread_attr attribute_hidden;
 189 extern int __default_pthread_attr_lock attribute_hidden;
 190
 191 /* Size and alignment of static TLS block.  */
 192 extern size_t __static_tls_size attribute_hidden;
 193 extern size_t __static_tls_align_m1 attribute_hidden;
 194
 195 /* Flag whether the machine is SMP or not.  */
 196 extern int __is_smp attribute_hidden;
 197
 198 /* Thread descriptor handling.  */
 199 extern list_t __stack_user;
 200 hidden_proto (__stack_user)
 201
 202 /* Attribute handling.  */
 203 extern struct pthread_attr *__attr_list attribute_hidden;
 204 extern int __attr_list_lock attribute_hidden;
 205
 206 /* Concurrency handling.  */
 207 extern int __concurrency_level attribute_hidden;
 208
 209 /* Thread-local data key handling.  */
 210 extern struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX];
 211 hidden_proto (__pthread_keys)
 212
 213 /* Number of threads running.  */
 214 extern unsigned int __nptl_nthreads attribute_hidden;
 215
 216 #ifndef __ASSUME_SET_ROBUST_LIST
 217 /* Negative if we do not have the system call and we can use it.  */
 218 extern int __set_robust_list_avail attribute_hidden;
 219 #endif
 220
 221 /* Thread Priority Protection.  */
 222 extern int __sched_fifo_min_prio attribute_hidden;
 223 extern int __sched_fifo_max_prio attribute_hidden;
 224 extern void __init_sched_fifo_prio (void) attribute_hidden;
 225 extern int __pthread_tpp_change_priority (int prev_prio, int new_prio)
 226      attribute_hidden;
 227 extern int __pthread_current_priority (void) attribute_hidden;
 228
 229 /* The library can run in debugging mode where it performs a lot more
 230    tests.  */
 231 extern int __pthread_debug attribute_hidden;
 232 /** For now disable debugging support.  */
 233 #if 0
 234 # define DEBUGGING_P __builtin_expect (__pthread_debug, 0)
 235 # define INVALID_TD_P(pd) (DEBUGGING_P && __find_in_stack_list (pd) == NULL)
 236 # define INVALID_NOT_TERMINATED_TD_P(pd) INVALID_TD_P (pd)
 237 #else
 238 # define DEBUGGING_P 0
 239 /* Simplified test.  This will not catch all invalid descriptors but
 240    is better than nothing.  And if the test triggers the thread
 241    descriptor is guaranteed to be invalid.  */
 242 # define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0)
 243 # define INVALID_NOT_TERMINATED_TD_P(pd) __builtin_expect ((pd)->tid < 0, 0)
 244 #endif
 245
 246
 247 /* Cancellation test.  */
 248 #define CANCELLATION_P(self) \
 249   do {                                                                        \
 250     int cancelhandling = THREAD_GETMEM (self, cancelhandling);                \
 251     if (CANCEL_ENABLED_AND_CANCELED (cancelhandling))                         \
 252       {                                                                       \
 253         THREAD_SETMEM (self, result, PTHREAD_CANCELED);                       \
 254         __do_cancel ();                                                       \
 255       }                                                                       \
 256   } while (0)
 257
 258
 259 extern void __pthread_unwind (__pthread_unwind_buf_t *__buf)
 260      __cleanup_fct_attribute __attribute ((__noreturn__))
 261 #if !defined SHARED && !IS_IN (libpthread)
 262      weak_function
 263 #endif
 264      ;
 265 extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
 266      __cleanup_fct_attribute __attribute ((__noreturn__))
 267 #ifndef SHARED
 268      weak_function
 269 #endif
 270      ;
 271 extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
 272      __cleanup_fct_attribute;
 273 extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
 274      __cleanup_fct_attribute;
 275 #if IS_IN (libpthread)
 276 hidden_proto (__pthread_unwind)
 277 hidden_proto (__pthread_unwind_next)
 278 hidden_proto (__pthread_register_cancel)
 279 hidden_proto (__pthread_unregister_cancel)
 280 # ifdef SHARED
 281 extern void attribute_hidden pthread_cancel_init (void);
 282 extern void __unwind_freeres (void);
 283 # endif
 284 #endif
 285
 286
 287 /* Called when a thread reacts on a cancellation request.  */
 288 static inline void
 289 __attribute ((noreturn, always_inline))
 290 __do_cancel (void)
 291 {
 292   struct pthread *self = THREAD_SELF;
 293
 294   /* Make sure we get no more cancellations.  */
 295   THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT);
 296
 297   __pthread_unwind ((__pthread_unwind_buf_t *)
 298                     THREAD_GETMEM (self, cleanup_jmp_buf));
 299 }
 300
 301
 302 /* Set cancellation mode to asynchronous.  */
 303 #define CANCEL_ASYNC() \
 304   __pthread_enable_asynccancel ()
 305 /* Reset to previous cancellation mode.  */
 306 #define CANCEL_RESET(oldtype) \
 307   __pthread_disable_asynccancel (oldtype)
 308
 309 #if IS_IN (libc)
 310 /* Same as CANCEL_ASYNC, but for use in libc.so.  */
 311 # define LIBC_CANCEL_ASYNC() \
 312   __libc_enable_asynccancel ()
 313 /* Same as CANCEL_RESET, but for use in libc.so.  */
 314 # define LIBC_CANCEL_RESET(oldtype) \
 315   __libc_disable_asynccancel (oldtype)
 316 # define LIBC_CANCEL_HANDLED() \
 317   __asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
 318   __asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
 319 #elif IS_IN (libpthread)
 320 # define LIBC_CANCEL_ASYNC() CANCEL_ASYNC ()
 321 # define LIBC_CANCEL_RESET(val) CANCEL_RESET (val)
 322 # define LIBC_CANCEL_HANDLED() \
 323   __asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
 324   __asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
 325 #elif IS_IN (librt)
 326 # define LIBC_CANCEL_ASYNC() \
 327   __librt_enable_asynccancel ()
 328 # define LIBC_CANCEL_RESET(val) \
 329   __librt_disable_asynccancel (val)
 330 # define LIBC_CANCEL_HANDLED() \
 331   __asm (".globl " __SYMBOL_PREFIX "__librt_enable_asynccancel"); \
 332   __asm (".globl " __SYMBOL_PREFIX "__librt_disable_asynccancel")
 333 #else
 334 # define LIBC_CANCEL_ASYNC()    0 /* Just a dummy value.  */
 335 # define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it.  */
 336 # define LIBC_CANCEL_HANDLED()  /* Nothing.  */
 337 #endif
 338
 339
 340 /* Internal prototypes.  */
 341
 342 /* Thread list handling.  */
 343 extern struct pthread *__find_in_stack_list (struct pthread *pd)
 344      attribute_hidden;
 345
 346 /* Deallocate a thread's stack after optionally making sure the thread
 347    descriptor is still valid.  */
 348 extern void __free_tcb (struct pthread *pd) attribute_hidden;
 349
 350 /* Free allocated stack.  */
 351 extern void __deallocate_stack (struct pthread *pd) attribute_hidden;
 352
 353 /* Mark all the stacks except for the current one as available.  This
 354    function also re-initializes the lock for the stack cache.  */
 355 extern void __reclaim_stacks (void) attribute_hidden;
 356
 357 /* Make all threads's stacks executable.  */
 358 extern int __make_stacks_executable (void **stack_endp) attribute_hidden;
 359
 360 /* longjmp handling.  */
 361 extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
 362 #if IS_IN (libpthread)
 363 hidden_proto (__pthread_cleanup_upto)
 364 #endif
 365
 366
 367 /* Functions with versioned interfaces.  */
 368 extern int __pthread_create_2_1 (pthread_t *newthread,
 369                                  const pthread_attr_t *attr,
 370                                  void *(*start_routine) (void *), void *arg);
 371 extern int __pthread_create_2_0 (pthread_t *newthread,
 372                                  const pthread_attr_t *attr,
 373                                  void *(*start_routine) (void *), void *arg);
 374 extern int __pthread_attr_init_2_1 (pthread_attr_t *attr);
 375 extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
 376
 377
 378 /* Event handlers for libthread_db interface.  */
 379 extern void __nptl_create_event (void);
 380 extern void __nptl_death_event (void);
 381 hidden_proto (__nptl_create_event)
 382 hidden_proto (__nptl_death_event)
 383
 384 /* Register the generation counter in the libpthread with the libc.  */
 385 #ifdef TLS_MULTIPLE_THREADS_IN_TCB
 386 extern void __libc_pthread_init (unsigned long int *ptr,
 387                                  void (*reclaim) (void),
 388                                  const struct pthread_functions *functions);
 389 #else
 390 extern int *__libc_pthread_init (unsigned long int *ptr,
 391                                  void (*reclaim) (void),
 392                                  const struct pthread_functions *functions);
 393
 394 /* Variable set to a nonzero value either if more than one thread runs or ran,
 395    or if a single-threaded process is trying to cancel itself.  See
 396    nptl/descr.h for more context on the single-threaded process case.  */
 397 extern int __pthread_multiple_threads attribute_hidden;
 398 /* Pointer to the corresponding variable in libc.  */
 399 extern int *__libc_multiple_threads_ptr attribute_hidden;
 400 #endif
 401
 402 /* Find a thread given its TID.  */
 403 extern struct pthread *__find_thread_by_id (pid_t tid) attribute_hidden
 404 #ifdef SHARED
 405 ;
 406 #else
 407 weak_function;
 408 #define __find_thread_by_id(tid) \
 409   (__find_thread_by_id ? (__find_thread_by_id) (tid) : (struct pthread *) NULL)
 410 #endif
 411
 412 extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
 413
 414 extern size_t __pthread_get_minstack (const pthread_attr_t *attr);
 415
 416 /* Namespace save aliases.  */
 417 extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
 418                                     struct sched_param *param);
 419 extern int __pthread_setschedparam (pthread_t thread_id, int policy,
 420                                     const struct sched_param *param);
 421 extern int __pthread_setcancelstate (int state, int *oldstate);
 422 extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 423                                  const pthread_mutexattr_t *__mutexattr);
 424 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 425 extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
 426 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
 427 extern int __pthread_mutex_timedlock (pthread_mutex_t *__mutex,
 428      const struct timespec *__abstime);
 429 extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
 430      attribute_hidden;
 431 extern void __pthread_mutex_cond_lock_adjust (pthread_mutex_t *__mutex)
 432      attribute_hidden;
 433 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 434 extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
 435                                            int __decr) attribute_hidden;
 436 extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
 437 extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
 438 extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
 439 extern int __pthread_attr_destroy (pthread_attr_t *attr);
 440 extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
 441                                           int *detachstate);
 442 extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
 443                                           int detachstate);
 444 extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
 445                                            int *inherit);
 446 extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
 447 extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
 448                                          struct sched_param *param);
 449 extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
 450                                          const struct sched_param *param);
 451 extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
 452                                           int *policy);
 453 extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
 454 extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
 455 extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
 456 extern int __pthread_attr_getstackaddr (const pthread_attr_t *__restrict
 457                                         __attr, void **__restrict __stackaddr);
 458 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 459                                         void *__stackaddr);
 460 extern int __pthread_attr_getstacksize (const pthread_attr_t *__restrict
 461                                         __attr,
 462                                         size_t *__restrict __stacksize);
 463 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 464                                         size_t __stacksize);
 465 extern int __pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
 466                                     void **__restrict __stackaddr,
 467                                     size_t *__restrict __stacksize);
 468 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 469                                     size_t __stacksize);
 470 extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
 471                                   const pthread_rwlockattr_t *__restrict
 472                                   __attr);
 473 extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
 474 extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
 475 extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
 476 extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
 477 extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
 478 extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
 479 extern int __pthread_cond_broadcast (pthread_cond_t *cond);
 480 extern int __pthread_cond_destroy (pthread_cond_t *cond);
 481 extern int __pthread_cond_init (pthread_cond_t *cond,
 482                                 const pthread_condattr_t *cond_attr);
 483 extern int __pthread_cond_signal (pthread_cond_t *cond);
 484 extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 485 extern int __pthread_cond_timedwait (pthread_cond_t *cond,
 486                                      pthread_mutex_t *mutex,
 487                                      const struct timespec *abstime);
 488 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 489 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 490 extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
 491 extern int __pthread_key_delete (pthread_key_t key);
 492 extern void *__pthread_getspecific (pthread_key_t key);
 493 extern int __pthread_setspecific (pthread_key_t key, const void *value);
 494 extern int __pthread_once (pthread_once_t *once_control,
 495                            void (*init_routine) (void));
 496 extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
 497                              void (*child) (void));
 498 extern pthread_t __pthread_self (void);
 499 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
 500 extern int __pthread_detach (pthread_t th);
 501 extern int __pthread_cancel (pthread_t th);
 502 extern int __pthread_kill (pthread_t threadid, int signo);
 503 extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
 504 extern int __pthread_join (pthread_t threadid, void **thread_return);
 505 extern int __pthread_setcanceltype (int type, int *oldtype);
 506 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 507 extern void __pthread_disable_asynccancel (int oldtype) attribute_hidden;
 508 extern void __pthread_testcancel (void);
 509 extern int __pthread_timedjoin_ex (pthread_t, void **, const struct timespec *,
 510                                    bool);
 511
 512 #if IS_IN (libpthread)
 513 hidden_proto (__pthread_mutex_init)
 514 hidden_proto (__pthread_mutex_destroy)
 515 hidden_proto (__pthread_mutex_lock)
 516 hidden_proto (__pthread_mutex_trylock)
 517 hidden_proto (__pthread_mutex_unlock)
 518 hidden_proto (__pthread_rwlock_rdlock)
 519 hidden_proto (__pthread_rwlock_wrlock)
 520 hidden_proto (__pthread_rwlock_unlock)
 521 hidden_proto (__pthread_key_create)
 522 hidden_proto (__pthread_getspecific)
 523 hidden_proto (__pthread_setspecific)
 524 hidden_proto (__pthread_once)
 525 hidden_proto (__pthread_setcancelstate)
 526 hidden_proto (__pthread_testcancel)
 527 hidden_proto (__pthread_mutexattr_init)
 528 hidden_proto (__pthread_mutexattr_settype)
 529 hidden_proto (__pthread_timedjoin_ex)
 530 #endif
 531
 532 extern int __pthread_cond_broadcast_2_0 (pthread_cond_2_0_t *cond);
 533 extern int __pthread_cond_destroy_2_0 (pthread_cond_2_0_t *cond);
 534 extern int __pthread_cond_init_2_0 (pthread_cond_2_0_t *cond,
 535                                     const pthread_condattr_t *cond_attr);
 536 extern int __pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond);
 537 extern int __pthread_cond_timedwait_2_0 (pthread_cond_2_0_t *cond,
 538                                          pthread_mutex_t *mutex,
 539                                          const struct timespec *abstime);
 540 extern int __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond,
 541                                     pthread_mutex_t *mutex);
 542
 543 extern int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize,
 544                                      cpu_set_t *cpuset);
 545
 546 /* The two functions are in libc.so and not exported.  */
 547 extern int __libc_enable_asynccancel (void) attribute_hidden;
 548 extern void __libc_disable_asynccancel (int oldtype) attribute_hidden;
 549
 550
 551 /* The two functions are in librt.so and not exported.  */
 552 extern int __librt_enable_asynccancel (void) attribute_hidden;
 553 extern void __librt_disable_asynccancel (int oldtype) attribute_hidden;
 554
 555 #if IS_IN (libpthread)
 556 /* Special versions which use non-exported functions.  */
 557 extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 558                                     void (*routine) (void *), void *arg)
 559      attribute_hidden;
 560
 561 /* Replace cleanup macros defined in <pthread.h> with internal
 562    versions that don't depend on unwind info and better support
 563    cancellation.  */
 564 # undef pthread_cleanup_push
 565 # define pthread_cleanup_push(routine,arg)              \
 566   { struct _pthread_cleanup_buffer _buffer;             \
 567   __pthread_cleanup_push (&_buffer, (routine), (arg));
 568
 569 extern void __pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 570                                    int execute) attribute_hidden;
 571 # undef pthread_cleanup_pop
 572 # define pthread_cleanup_pop(execute)                   \
 573   __pthread_cleanup_pop (&_buffer, (execute)); }
 574 #endif
 575
 576 extern void __pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 577                                           void (*routine) (void *), void *arg);
 578 extern void __pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 579                                            int execute);
 580
 581 /* Old cleanup interfaces, still used in libc.so.  */
 582 extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 583                                    void (*routine) (void *), void *arg);
 584 extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 585                                   int execute);
 586 extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 587                                          void (*routine) (void *), void *arg);
 588 extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 589                                           int execute);
 590
 591 extern void __nptl_deallocate_tsd (void) attribute_hidden;
 592
 593 extern void __nptl_setxid_error (struct xid_command *cmdp, int error)
 594   attribute_hidden;
 595 extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
 596 #ifndef SHARED
 597 extern void __nptl_set_robust (struct pthread *self);
 598 #endif
 599
 600 extern void __free_stacks (size_t limit) attribute_hidden;
 601
 602 extern void __wait_lookup_done (void) attribute_hidden;
 603
 604 #ifdef SHARED
 605 # define PTHREAD_STATIC_FN_REQUIRE(name)
 606 #else
 607 # define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
 608 #endif
 609
 610 /* Returns 0 if POL is a valid scheduling policy.  */
 611 static inline int
 612 check_sched_policy_attr (int pol)
 613 {
 614   if (pol == SCHED_OTHER || pol == SCHED_FIFO || pol == SCHED_RR)
 615     return 0;
 616
 617   return EINVAL;
 618 }
 619
 620 /* Returns 0 if PR is within the accepted range of priority values for
 621    the scheduling policy POL or EINVAL otherwise.  */
 622 static inline int
 623 check_sched_priority_attr (int pr, int pol)
 624 {
 625   int min = __sched_get_priority_min (pol);
 626   int max = __sched_get_priority_max (pol);
 627
 628   if (min >= 0 && max >= 0 && pr >= min && pr <= max)
 629     return 0;
 630
 631   return EINVAL;
 632 }
 633
 634 /* Returns 0 if ST is a valid stack size for a thread stack and EINVAL
 635    otherwise.  */
 636 static inline int
 637 check_stacksize_attr (size_t st)
 638 {
 639   if (st >= PTHREAD_STACK_MIN)
 640     return 0;
 641
 642   return EINVAL;
 643 }
 644
 645 #define ASSERT_TYPE_SIZE(type, size)                                    \
 646   _Static_assert (sizeof (type) == size,                                \
 647                   "sizeof (" #type ") != " #size)
 648
 649 #define ASSERT_PTHREAD_INTERNAL_SIZE(type, internal)                    \
 650   _Static_assert (sizeof ((type) { { 0 } }).__size >= sizeof (internal),\
 651                   "sizeof (" #type ".__size) < sizeof (" #internal ")")
 652
 653 #define ASSERT_PTHREAD_STRING(x) __STRING (x)
 654 #define ASSERT_PTHREAD_INTERNAL_OFFSET(type, member, offset)            \
 655   _Static_assert (offsetof (type, member) == offset,                    \
 656                   "offset of " #member " field of " #type " != "        \
 657                   ASSERT_PTHREAD_STRING (offset))
 658
 659 #endif  /* pthreadP.h */