nptl/pthreadP.h

   1 /* Copyright (C) 2002-2015 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 /* Check whether rwlock prefers readers.   */
 154 #define PTHREAD_RWLOCK_PREFER_READER_P(rwlock) \
 155   ((rwlock)->__data.__flags == 0)
 156
 157
 158 /* Bits used in robust mutex implementation.  */
 159 #define FUTEX_WAITERS           0x80000000
 160 #define FUTEX_OWNER_DIED        0x40000000
 161 #define FUTEX_TID_MASK          0x3fffffff
 162
 163
 164 /* pthread_once definitions.  See __pthread_once for how these are used.  */
 165 #define __PTHREAD_ONCE_INPROGRESS       1
 166 #define __PTHREAD_ONCE_DONE             2
 167 #define __PTHREAD_ONCE_FORK_GEN_INCR    4
 168
 169
 170 /* Internal variables.  */
 171
 172
 173 /* Default pthread attributes.  */
 174 extern struct pthread_attr __default_pthread_attr attribute_hidden;
 175 extern int __default_pthread_attr_lock attribute_hidden;
 176
 177 /* Size and alignment of static TLS block.  */
 178 extern size_t __static_tls_size attribute_hidden;
 179 extern size_t __static_tls_align_m1 attribute_hidden;
 180
 181 /* Flag whether the machine is SMP or not.  */
 182 extern int __is_smp attribute_hidden;
 183
 184 /* Thread descriptor handling.  */
 185 extern list_t __stack_user;
 186 hidden_proto (__stack_user)
 187
 188 /* Attribute handling.  */
 189 extern struct pthread_attr *__attr_list attribute_hidden;
 190 extern int __attr_list_lock attribute_hidden;
 191
 192 /* Concurrency handling.  */
 193 extern int __concurrency_level attribute_hidden;
 194
 195 /* Thread-local data key handling.  */
 196 extern struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX];
 197 hidden_proto (__pthread_keys)
 198
 199 /* Number of threads running.  */
 200 extern unsigned int __nptl_nthreads attribute_hidden;
 201
 202 #ifndef __ASSUME_SET_ROBUST_LIST
 203 /* Negative if we do not have the system call and we can use it.  */
 204 extern int __set_robust_list_avail attribute_hidden;
 205 #endif
 206
 207 /* Thread Priority Protection.  */
 208 extern int __sched_fifo_min_prio attribute_hidden;
 209 extern int __sched_fifo_max_prio attribute_hidden;
 210 extern void __init_sched_fifo_prio (void) attribute_hidden;
 211 extern int __pthread_tpp_change_priority (int prev_prio, int new_prio)
 212      attribute_hidden;
 213 extern int __pthread_current_priority (void) attribute_hidden;
 214
 215 /* The library can run in debugging mode where it performs a lot more
 216    tests.  */
 217 extern int __pthread_debug attribute_hidden;
 218 /** For now disable debugging support.  */
 219 #if 0
 220 # define DEBUGGING_P __builtin_expect (__pthread_debug, 0)
 221 # define INVALID_TD_P(pd) (DEBUGGING_P && __find_in_stack_list (pd) == NULL)
 222 # define INVALID_NOT_TERMINATED_TD_P(pd) INVALID_TD_P (pd)
 223 #else
 224 # define DEBUGGING_P 0
 225 /* Simplified test.  This will not catch all invalid descriptors but
 226    is better than nothing.  And if the test triggers the thread
 227    descriptor is guaranteed to be invalid.  */
 228 # define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0)
 229 # define INVALID_NOT_TERMINATED_TD_P(pd) __builtin_expect ((pd)->tid < 0, 0)
 230 #endif
 231
 232
 233 /* Cancellation test.  */
 234 #define CANCELLATION_P(self) \
 235   do {                                                                        \
 236     int cancelhandling = THREAD_GETMEM (self, cancelhandling);                \
 237     if (CANCEL_ENABLED_AND_CANCELED (cancelhandling))                         \
 238       {                                                                       \
 239         THREAD_SETMEM (self, result, PTHREAD_CANCELED);                       \
 240         __do_cancel ();                                                       \
 241       }                                                                       \
 242   } while (0)
 243
 244
 245 extern void __pthread_unwind (__pthread_unwind_buf_t *__buf)
 246      __cleanup_fct_attribute __attribute ((__noreturn__))
 247 #if !defined SHARED && !IS_IN (libpthread)
 248      weak_function
 249 #endif
 250      ;
 251 extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
 252      __cleanup_fct_attribute __attribute ((__noreturn__))
 253 #ifndef SHARED
 254      weak_function
 255 #endif
 256      ;
 257 extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
 258      __cleanup_fct_attribute;
 259 extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
 260      __cleanup_fct_attribute;
 261 #if IS_IN (libpthread)
 262 hidden_proto (__pthread_unwind)
 263 hidden_proto (__pthread_unwind_next)
 264 hidden_proto (__pthread_register_cancel)
 265 hidden_proto (__pthread_unregister_cancel)
 266 # ifdef SHARED
 267 extern void attribute_hidden pthread_cancel_init (void);
 268 extern void __unwind_freeres (void);
 269 # endif
 270 #endif
 271
 272
 273 /* Called when a thread reacts on a cancellation request.  */
 274 static inline void
 275 __attribute ((noreturn, always_inline))
 276 __do_cancel (void)
 277 {
 278   struct pthread *self = THREAD_SELF;
 279
 280   /* Make sure we get no more cancellations.  */
 281   THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT);
 282
 283   __pthread_unwind ((__pthread_unwind_buf_t *)
 284                     THREAD_GETMEM (self, cleanup_jmp_buf));
 285 }
 286
 287
 288 /* Set cancellation mode to asynchronous.  */
 289 #define CANCEL_ASYNC() \
 290   __pthread_enable_asynccancel ()
 291 /* Reset to previous cancellation mode.  */
 292 #define CANCEL_RESET(oldtype) \
 293   __pthread_disable_asynccancel (oldtype)
 294
 295 #if IS_IN (libc)
 296 /* Same as CANCEL_ASYNC, but for use in libc.so.  */
 297 # define LIBC_CANCEL_ASYNC() \
 298   __libc_enable_asynccancel ()
 299 /* Same as CANCEL_RESET, but for use in libc.so.  */
 300 # define LIBC_CANCEL_RESET(oldtype) \
 301   __libc_disable_asynccancel (oldtype)
 302 # define LIBC_CANCEL_HANDLED() \
 303   __asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
 304   __asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
 305 #elif IS_IN (libpthread)
 306 # define LIBC_CANCEL_ASYNC() CANCEL_ASYNC ()
 307 # define LIBC_CANCEL_RESET(val) CANCEL_RESET (val)
 308 # define LIBC_CANCEL_HANDLED() \
 309   __asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
 310   __asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
 311 #elif IS_IN (librt)
 312 # define LIBC_CANCEL_ASYNC() \
 313   __librt_enable_asynccancel ()
 314 # define LIBC_CANCEL_RESET(val) \
 315   __librt_disable_asynccancel (val)
 316 # define LIBC_CANCEL_HANDLED() \
 317   __asm (".globl " __SYMBOL_PREFIX "__librt_enable_asynccancel"); \
 318   __asm (".globl " __SYMBOL_PREFIX "__librt_disable_asynccancel")
 319 #else
 320 # define LIBC_CANCEL_ASYNC()    0 /* Just a dummy value.  */
 321 # define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it.  */
 322 # define LIBC_CANCEL_HANDLED()  /* Nothing.  */
 323 #endif
 324
 325
 326 /* Internal prototypes.  */
 327
 328 /* Thread list handling.  */
 329 extern struct pthread *__find_in_stack_list (struct pthread *pd)
 330      attribute_hidden internal_function;
 331
 332 /* Deallocate a thread's stack after optionally making sure the thread
 333    descriptor is still valid.  */
 334 extern void __free_tcb (struct pthread *pd) attribute_hidden internal_function;
 335
 336 /* Free allocated stack.  */
 337 extern void __deallocate_stack (struct pthread *pd)
 338      attribute_hidden internal_function;
 339
 340 /* Mark all the stacks except for the current one as available.  This
 341    function also re-initializes the lock for the stack cache.  */
 342 extern void __reclaim_stacks (void) attribute_hidden;
 343
 344 /* Make all threads's stacks executable.  */
 345 extern int __make_stacks_executable (void **stack_endp)
 346      internal_function attribute_hidden;
 347
 348 /* longjmp handling.  */
 349 extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
 350 #if IS_IN (libpthread)
 351 hidden_proto (__pthread_cleanup_upto)
 352 #endif
 353
 354
 355 /* Functions with versioned interfaces.  */
 356 extern int __pthread_create_2_1 (pthread_t *newthread,
 357                                  const pthread_attr_t *attr,
 358                                  void *(*start_routine) (void *), void *arg);
 359 extern int __pthread_create_2_0 (pthread_t *newthread,
 360                                  const pthread_attr_t *attr,
 361                                  void *(*start_routine) (void *), void *arg);
 362 extern int __pthread_attr_init_2_1 (pthread_attr_t *attr);
 363 extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
 364
 365
 366 /* Event handlers for libthread_db interface.  */
 367 extern void __nptl_create_event (void);
 368 extern void __nptl_death_event (void);
 369 hidden_proto (__nptl_create_event)
 370 hidden_proto (__nptl_death_event)
 371
 372 /* Register the generation counter in the libpthread with the libc.  */
 373 #ifdef TLS_MULTIPLE_THREADS_IN_TCB
 374 extern void __libc_pthread_init (unsigned long int *ptr,
 375                                  void (*reclaim) (void),
 376                                  const struct pthread_functions *functions)
 377      internal_function;
 378 #else
 379 extern int *__libc_pthread_init (unsigned long int *ptr,
 380                                  void (*reclaim) (void),
 381                                  const struct pthread_functions *functions)
 382      internal_function;
 383
 384 /* Variable set to a nonzero value either if more than one thread runs or ran,
 385    or if a single-threaded process is trying to cancel itself.  See
 386    nptl/descr.h for more context on the single-threaded process case.  */
 387 extern int __pthread_multiple_threads attribute_hidden;
 388 /* Pointer to the corresponding variable in libc.  */
 389 extern int *__libc_multiple_threads_ptr attribute_hidden;
 390 #endif
 391
 392 /* Find a thread given its TID.  */
 393 extern struct pthread *__find_thread_by_id (pid_t tid) attribute_hidden
 394 #ifdef SHARED
 395 ;
 396 #else
 397 weak_function;
 398 #define __find_thread_by_id(tid) \
 399   (__find_thread_by_id ? (__find_thread_by_id) (tid) : (struct pthread *) NULL)
 400 #endif
 401
 402 extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
 403
 404 extern size_t __pthread_get_minstack (const pthread_attr_t *attr);
 405
 406 /* Namespace save aliases.  */
 407 extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
 408                                     struct sched_param *param);
 409 extern int __pthread_setschedparam (pthread_t thread_id, int policy,
 410                                     const struct sched_param *param);
 411 extern int __pthread_setcancelstate (int state, int *oldstate);
 412 extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 413                                  const pthread_mutexattr_t *__mutexattr);
 414 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 415 extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
 416 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
 417 extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
 418      attribute_hidden internal_function;
 419 extern void __pthread_mutex_cond_lock_adjust (pthread_mutex_t *__mutex)
 420      attribute_hidden internal_function;
 421 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 422 extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
 423                                            int __decr)
 424      attribute_hidden internal_function;
 425 extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
 426 extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
 427 extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
 428 extern int __pthread_attr_destroy (pthread_attr_t *attr);
 429 extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
 430                                           int *detachstate);
 431 extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
 432                                           int detachstate);
 433 extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
 434                                            int *inherit);
 435 extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
 436 extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
 437                                          struct sched_param *param);
 438 extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
 439                                          const struct sched_param *param);
 440 extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
 441                                           int *policy);
 442 extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
 443 extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
 444 extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
 445 extern int __pthread_attr_getstackaddr (const pthread_attr_t *__restrict
 446                                         __attr, void **__restrict __stackaddr);
 447 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 448                                         void *__stackaddr);
 449 extern int __pthread_attr_getstacksize (const pthread_attr_t *__restrict
 450                                         __attr,
 451                                         size_t *__restrict __stacksize);
 452 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 453                                         size_t __stacksize);
 454 extern int __pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
 455                                     void **__restrict __stackaddr,
 456                                     size_t *__restrict __stacksize);
 457 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 458                                     size_t __stacksize);
 459 extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
 460                                   const pthread_rwlockattr_t *__restrict
 461                                   __attr);
 462 extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
 463 extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
 464 extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
 465 extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
 466 extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
 467 extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
 468 extern int __pthread_cond_broadcast (pthread_cond_t *cond);
 469 extern int __pthread_cond_destroy (pthread_cond_t *cond);
 470 extern int __pthread_cond_init (pthread_cond_t *cond,
 471                                 const pthread_condattr_t *cond_attr);
 472 extern int __pthread_cond_signal (pthread_cond_t *cond);
 473 extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 474 extern int __pthread_cond_timedwait (pthread_cond_t *cond,
 475                                      pthread_mutex_t *mutex,
 476                                      const struct timespec *abstime);
 477 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 478 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 479 extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
 480 extern void *__pthread_getspecific (pthread_key_t key);
 481 extern int __pthread_setspecific (pthread_key_t key, const void *value);
 482 extern int __pthread_once (pthread_once_t *once_control,
 483                            void (*init_routine) (void));
 484 extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
 485                              void (*child) (void));
 486 extern pthread_t __pthread_self (void);
 487 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
 488 extern int __pthread_kill (pthread_t threadid, int signo);
 489 extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
 490 extern int __pthread_setcanceltype (int type, int *oldtype);
 491 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 492 extern void __pthread_disable_asynccancel (int oldtype)
 493      internal_function attribute_hidden;
 494
 495 #if IS_IN (libpthread)
 496 hidden_proto (__pthread_mutex_init)
 497 hidden_proto (__pthread_mutex_destroy)
 498 hidden_proto (__pthread_mutex_lock)
 499 hidden_proto (__pthread_mutex_unlock)
 500 hidden_proto (__pthread_rwlock_rdlock)
 501 hidden_proto (__pthread_rwlock_wrlock)
 502 hidden_proto (__pthread_rwlock_unlock)
 503 hidden_proto (__pthread_key_create)
 504 hidden_proto (__pthread_getspecific)
 505 hidden_proto (__pthread_setspecific)
 506 hidden_proto (__pthread_once)
 507 #endif
 508
 509 extern int __pthread_cond_broadcast_2_0 (pthread_cond_2_0_t *cond);
 510 extern int __pthread_cond_destroy_2_0 (pthread_cond_2_0_t *cond);
 511 extern int __pthread_cond_init_2_0 (pthread_cond_2_0_t *cond,
 512                                     const pthread_condattr_t *cond_attr);
 513 extern int __pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond);
 514 extern int __pthread_cond_timedwait_2_0 (pthread_cond_2_0_t *cond,
 515                                          pthread_mutex_t *mutex,
 516                                          const struct timespec *abstime);
 517 extern int __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond,
 518                                     pthread_mutex_t *mutex);
 519
 520 extern int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize,
 521                                      cpu_set_t *cpuset);
 522
 523 /* The two functions are in libc.so and not exported.  */
 524 extern int __libc_enable_asynccancel (void) attribute_hidden;
 525 extern void __libc_disable_asynccancel (int oldtype)
 526      internal_function attribute_hidden;
 527
 528
 529 /* The two functions are in librt.so and not exported.  */
 530 extern int __librt_enable_asynccancel (void) attribute_hidden;
 531 extern void __librt_disable_asynccancel (int oldtype)
 532      internal_function attribute_hidden;
 533
 534 #if IS_IN (libpthread)
 535 /* Special versions which use non-exported functions.  */
 536 extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 537                                     void (*routine) (void *), void *arg)
 538      attribute_hidden;
 539
 540 /* Replace cleanup macros defined in <pthread.h> with internal
 541    versions that don't depend on unwind info and better support
 542    cancellation.  */
 543 # undef pthread_cleanup_push
 544 # define pthread_cleanup_push(routine,arg)              \
 545   { struct _pthread_cleanup_buffer _buffer;             \
 546   __pthread_cleanup_push (&_buffer, (routine), (arg));
 547
 548 extern void __pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 549                                    int execute) attribute_hidden;
 550 # undef pthread_cleanup_pop
 551 # define pthread_cleanup_pop(execute)                   \
 552   __pthread_cleanup_pop (&_buffer, (execute)); }
 553 #endif
 554
 555 extern void __pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 556                                           void (*routine) (void *), void *arg);
 557 extern void __pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 558                                            int execute);
 559
 560 /* Old cleanup interfaces, still used in libc.so.  */
 561 extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 562                                    void (*routine) (void *), void *arg);
 563 extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 564                                   int execute);
 565 extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 566                                          void (*routine) (void *), void *arg);
 567 extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 568                                           int execute);
 569
 570 extern void __nptl_deallocate_tsd (void) attribute_hidden;
 571
 572 extern void __nptl_setxid_error (struct xid_command *cmdp, int error)
 573   attribute_hidden;
 574 extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
 575 #ifndef SHARED
 576 extern void __nptl_set_robust (struct pthread *self);
 577 #endif
 578
 579 extern void __free_stacks (size_t limit) attribute_hidden;
 580
 581 extern void __wait_lookup_done (void) attribute_hidden;
 582
 583 #ifdef SHARED
 584 # define PTHREAD_STATIC_FN_REQUIRE(name)
 585 #else
 586 # define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
 587 #endif
 588
 589 /* Test if the mutex is suitable for the FUTEX_WAIT_REQUEUE_PI operation.  */
 590 #if (defined lll_futex_wait_requeue_pi \
 591      && defined __ASSUME_REQUEUE_PI)
 592 # define USE_REQUEUE_PI(mut) \
 593    ((mut) && (mut) != (void *) ~0l \
 594     && (((mut)->__data.__kind \
 595          & (PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_NORMAL_NP)) \
 596         == PTHREAD_MUTEX_PRIO_INHERIT_NP))
 597 #else
 598 # define USE_REQUEUE_PI(mut) 0
 599 #endif
 600
 601 /* Returns 0 if POL is a valid scheduling policy.  */
 602 static inline int
 603 check_sched_policy_attr (int pol)
 604 {
 605   if (pol == SCHED_OTHER || pol == SCHED_FIFO || pol == SCHED_RR)
 606     return 0;
 607
 608   return EINVAL;
 609 }
 610
 611 /* Returns 0 if PR is within the accepted range of priority values for
 612    the scheduling policy POL or EINVAL otherwise.  */
 613 static inline int
 614 check_sched_priority_attr (int pr, int pol)
 615 {
 616   int min = __sched_get_priority_min (pol);
 617   int max = __sched_get_priority_max (pol);
 618
 619   if (min >= 0 && max >= 0 && pr >= min && pr <= max)
 620     return 0;
 621
 622   return EINVAL;
 623 }
 624
 625 /* Returns 0 if ST is a valid stack size for a thread stack and EINVAL
 626    otherwise.  */
 627 static inline int
 628 check_stacksize_attr (size_t st)
 629 {
 630   if (st >= PTHREAD_STACK_MIN)
 631     return 0;
 632
 633   return EINVAL;
 634 }
 635
 636 #endif  /* pthreadP.h */