nptl/pthreadP.h

   1 /* Copyright (C) 2002-2014 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 /* Internal variables.  */
 165
 166
 167 /* Default pthread attributes.  */
 168 extern struct pthread_attr __default_pthread_attr attribute_hidden;
 169 extern int __default_pthread_attr_lock attribute_hidden;
 170
 171 /* Size and alignment of static TLS block.  */
 172 extern size_t __static_tls_size attribute_hidden;
 173 extern size_t __static_tls_align_m1 attribute_hidden;
 174
 175 /* Flag whether the machine is SMP or not.  */
 176 extern int __is_smp attribute_hidden;
 177
 178 /* Thread descriptor handling.  */
 179 extern list_t __stack_user;
 180 hidden_proto (__stack_user)
 181
 182 /* Attribute handling.  */
 183 extern struct pthread_attr *__attr_list attribute_hidden;
 184 extern int __attr_list_lock attribute_hidden;
 185
 186 /* Concurrency handling.  */
 187 extern int __concurrency_level attribute_hidden;
 188
 189 /* Thread-local data key handling.  */
 190 extern struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX];
 191 hidden_proto (__pthread_keys)
 192
 193 /* Number of threads running.  */
 194 extern unsigned int __nptl_nthreads attribute_hidden;
 195
 196 #ifndef __ASSUME_SET_ROBUST_LIST
 197 /* Negative if we do not have the system call and we can use it.  */
 198 extern int __set_robust_list_avail attribute_hidden;
 199 #endif
 200
 201 /* Thread Priority Protection.  */
 202 extern int __sched_fifo_min_prio attribute_hidden;
 203 extern int __sched_fifo_max_prio attribute_hidden;
 204 extern void __init_sched_fifo_prio (void) attribute_hidden;
 205 extern int __pthread_tpp_change_priority (int prev_prio, int new_prio)
 206      attribute_hidden;
 207 extern int __pthread_current_priority (void) attribute_hidden;
 208
 209 /* The library can run in debugging mode where it performs a lot more
 210    tests.  */
 211 extern int __pthread_debug attribute_hidden;
 212 /** For now disable debugging support.  */
 213 #if 0
 214 # define DEBUGGING_P __builtin_expect (__pthread_debug, 0)
 215 # define INVALID_TD_P(pd) (DEBUGGING_P && __find_in_stack_list (pd) == NULL)
 216 # define INVALID_NOT_TERMINATED_TD_P(pd) INVALID_TD_P (pd)
 217 #else
 218 # define DEBUGGING_P 0
 219 /* Simplified test.  This will not catch all invalid descriptors but
 220    is better than nothing.  And if the test triggers the thread
 221    descriptor is guaranteed to be invalid.  */
 222 # define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0)
 223 # define INVALID_NOT_TERMINATED_TD_P(pd) __builtin_expect ((pd)->tid < 0, 0)
 224 #endif
 225
 226
 227 /* Cancellation test.  */
 228 #define CANCELLATION_P(self) \
 229   do {                                                                        \
 230     int cancelhandling = THREAD_GETMEM (self, cancelhandling);                \
 231     if (CANCEL_ENABLED_AND_CANCELED (cancelhandling))                         \
 232       {                                                                       \
 233         THREAD_SETMEM (self, result, PTHREAD_CANCELED);                       \
 234         __do_cancel ();                                                       \
 235       }                                                                       \
 236   } while (0)
 237
 238
 239 extern void __pthread_unwind (__pthread_unwind_buf_t *__buf)
 240      __cleanup_fct_attribute __attribute ((__noreturn__))
 241 #if !defined SHARED && !defined IS_IN_libpthread
 242      weak_function
 243 #endif
 244      ;
 245 extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
 246      __cleanup_fct_attribute __attribute ((__noreturn__))
 247 #ifndef SHARED
 248      weak_function
 249 #endif
 250      ;
 251 extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
 252      __cleanup_fct_attribute;
 253 extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
 254      __cleanup_fct_attribute;
 255 #ifdef IS_IN_libpthread
 256 hidden_proto (__pthread_unwind)
 257 hidden_proto (__pthread_unwind_next)
 258 hidden_proto (__pthread_register_cancel)
 259 hidden_proto (__pthread_unregister_cancel)
 260 # ifdef SHARED
 261 extern void attribute_hidden pthread_cancel_init (void);
 262 extern void __unwind_freeres (void);
 263 # endif
 264 #endif
 265
 266
 267 /* Called when a thread reacts on a cancellation request.  */
 268 static inline void
 269 __attribute ((noreturn, always_inline))
 270 __do_cancel (void)
 271 {
 272   struct pthread *self = THREAD_SELF;
 273
 274   /* Make sure we get no more cancellations.  */
 275   THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT);
 276
 277   __pthread_unwind ((__pthread_unwind_buf_t *)
 278                     THREAD_GETMEM (self, cleanup_jmp_buf));
 279 }
 280
 281
 282 /* Set cancellation mode to asynchronous.  */
 283 #define CANCEL_ASYNC() \
 284   __pthread_enable_asynccancel ()
 285 /* Reset to previous cancellation mode.  */
 286 #define CANCEL_RESET(oldtype) \
 287   __pthread_disable_asynccancel (oldtype)
 288
 289 #if !defined NOT_IN_libc
 290 /* Same as CANCEL_ASYNC, but for use in libc.so.  */
 291 # define LIBC_CANCEL_ASYNC() \
 292   __libc_enable_asynccancel ()
 293 /* Same as CANCEL_RESET, but for use in libc.so.  */
 294 # define LIBC_CANCEL_RESET(oldtype) \
 295   __libc_disable_asynccancel (oldtype)
 296 # define LIBC_CANCEL_HANDLED() \
 297   __asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
 298   __asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
 299 #elif defined IS_IN_libpthread
 300 # define LIBC_CANCEL_ASYNC() CANCEL_ASYNC ()
 301 # define LIBC_CANCEL_RESET(val) CANCEL_RESET (val)
 302 # define LIBC_CANCEL_HANDLED() \
 303   __asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
 304   __asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
 305 #elif defined IS_IN_librt
 306 # define LIBC_CANCEL_ASYNC() \
 307   __librt_enable_asynccancel ()
 308 # define LIBC_CANCEL_RESET(val) \
 309   __librt_disable_asynccancel (val)
 310 # define LIBC_CANCEL_HANDLED() \
 311   __asm (".globl " __SYMBOL_PREFIX "__librt_enable_asynccancel"); \
 312   __asm (".globl " __SYMBOL_PREFIX "__librt_disable_asynccancel")
 313 #else
 314 # define LIBC_CANCEL_ASYNC()    0 /* Just a dummy value.  */
 315 # define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it.  */
 316 # define LIBC_CANCEL_HANDLED()  /* Nothing.  */
 317 #endif
 318
 319
 320 /* Internal prototypes.  */
 321
 322 /* Thread list handling.  */
 323 extern struct pthread *__find_in_stack_list (struct pthread *pd)
 324      attribute_hidden internal_function;
 325
 326 /* Deallocate a thread's stack after optionally making sure the thread
 327    descriptor is still valid.  */
 328 extern void __free_tcb (struct pthread *pd) attribute_hidden internal_function;
 329
 330 /* Free allocated stack.  */
 331 extern void __deallocate_stack (struct pthread *pd)
 332      attribute_hidden internal_function;
 333
 334 /* Mark all the stacks except for the current one as available.  This
 335    function also re-initializes the lock for the stack cache.  */
 336 extern void __reclaim_stacks (void) attribute_hidden;
 337
 338 /* Make all threads's stacks executable.  */
 339 extern int __make_stacks_executable (void **stack_endp)
 340      internal_function attribute_hidden;
 341
 342 /* longjmp handling.  */
 343 extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
 344 #ifdef IS_IN_libpthread
 345 hidden_proto (__pthread_cleanup_upto)
 346 #endif
 347
 348
 349 /* Functions with versioned interfaces.  */
 350 extern int __pthread_create_2_1 (pthread_t *newthread,
 351                                  const pthread_attr_t *attr,
 352                                  void *(*start_routine) (void *), void *arg);
 353 extern int __pthread_create_2_0 (pthread_t *newthread,
 354                                  const pthread_attr_t *attr,
 355                                  void *(*start_routine) (void *), void *arg);
 356 extern int __pthread_attr_init_2_1 (pthread_attr_t *attr);
 357 extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
 358
 359
 360 /* Event handlers for libthread_db interface.  */
 361 extern void __nptl_create_event (void);
 362 extern void __nptl_death_event (void);
 363 hidden_proto (__nptl_create_event)
 364 hidden_proto (__nptl_death_event)
 365
 366 /* Register the generation counter in the libpthread with the libc.  */
 367 #ifdef TLS_MULTIPLE_THREADS_IN_TCB
 368 extern void __libc_pthread_init (unsigned long int *ptr,
 369                                  void (*reclaim) (void),
 370                                  const struct pthread_functions *functions)
 371      internal_function;
 372 #else
 373 extern int *__libc_pthread_init (unsigned long int *ptr,
 374                                  void (*reclaim) (void),
 375                                  const struct pthread_functions *functions)
 376      internal_function;
 377
 378 /* Variable set to a nonzero value either if more than one thread runs or ran,
 379    or if a single-threaded process is trying to cancel itself.  See
 380    nptl/descr.h for more context on the single-threaded process case.  */
 381 extern int __pthread_multiple_threads attribute_hidden;
 382 /* Pointer to the corresponding variable in libc.  */
 383 extern int *__libc_multiple_threads_ptr attribute_hidden;
 384 #endif
 385
 386 /* Find a thread given its TID.  */
 387 extern struct pthread *__find_thread_by_id (pid_t tid) attribute_hidden
 388 #ifdef SHARED
 389 ;
 390 #else
 391 weak_function;
 392 #define __find_thread_by_id(tid) \
 393   (__find_thread_by_id ? (__find_thread_by_id) (tid) : (struct pthread *) NULL)
 394 #endif
 395
 396 extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
 397
 398 extern size_t __pthread_get_minstack (const pthread_attr_t *attr);
 399
 400 /* Namespace save aliases.  */
 401 extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
 402                                     struct sched_param *param);
 403 extern int __pthread_setschedparam (pthread_t thread_id, int policy,
 404                                     const struct sched_param *param);
 405 extern int __pthread_setcancelstate (int state, int *oldstate);
 406 extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 407                                  const pthread_mutexattr_t *__mutexattr);
 408 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 409 extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
 410 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
 411 extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
 412      attribute_hidden internal_function;
 413 extern void __pthread_mutex_cond_lock_adjust (pthread_mutex_t *__mutex)
 414      attribute_hidden internal_function;
 415 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 416 extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
 417                                            int __decr)
 418      attribute_hidden internal_function;
 419 extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
 420 extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
 421 extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
 422 extern int __pthread_attr_destroy (pthread_attr_t *attr);
 423 extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
 424                                           int *detachstate);
 425 extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
 426                                           int detachstate);
 427 extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
 428                                            int *inherit);
 429 extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
 430 extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
 431                                          struct sched_param *param);
 432 extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
 433                                          const struct sched_param *param);
 434 extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
 435                                           int *policy);
 436 extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
 437 extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
 438 extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
 439 extern int __pthread_attr_getstackaddr (const pthread_attr_t *__restrict
 440                                         __attr, void **__restrict __stackaddr);
 441 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 442                                         void *__stackaddr);
 443 extern int __pthread_attr_getstacksize (const pthread_attr_t *__restrict
 444                                         __attr,
 445                                         size_t *__restrict __stacksize);
 446 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 447                                         size_t __stacksize);
 448 extern int __pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
 449                                     void **__restrict __stackaddr,
 450                                     size_t *__restrict __stacksize);
 451 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 452                                     size_t __stacksize);
 453 extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
 454                                   const pthread_rwlockattr_t *__restrict
 455                                   __attr);
 456 extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
 457 extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
 458 extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
 459 extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
 460 extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
 461 extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
 462 extern int __pthread_cond_broadcast (pthread_cond_t *cond);
 463 extern int __pthread_cond_destroy (pthread_cond_t *cond);
 464 extern int __pthread_cond_init (pthread_cond_t *cond,
 465                                 const pthread_condattr_t *cond_attr);
 466 extern int __pthread_cond_signal (pthread_cond_t *cond);
 467 extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 468 extern int __pthread_cond_timedwait (pthread_cond_t *cond,
 469                                      pthread_mutex_t *mutex,
 470                                      const struct timespec *abstime);
 471 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 472 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 473 extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
 474 extern void *__pthread_getspecific (pthread_key_t key);
 475 extern int __pthread_setspecific (pthread_key_t key, const void *value);
 476 extern int __pthread_once (pthread_once_t *once_control,
 477                            void (*init_routine) (void));
 478 extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
 479                              void (*child) (void));
 480 extern pthread_t __pthread_self (void);
 481 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
 482 extern int __pthread_kill (pthread_t threadid, int signo);
 483 extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
 484 extern int __pthread_setcanceltype (int type, int *oldtype);
 485 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 486 extern void __pthread_disable_asynccancel (int oldtype)
 487      internal_function attribute_hidden;
 488
 489 #ifdef IS_IN_libpthread
 490 hidden_proto (__pthread_mutex_init)
 491 hidden_proto (__pthread_mutex_destroy)
 492 hidden_proto (__pthread_mutex_lock)
 493 hidden_proto (__pthread_mutex_unlock)
 494 hidden_proto (__pthread_rwlock_rdlock)
 495 hidden_proto (__pthread_rwlock_wrlock)
 496 hidden_proto (__pthread_rwlock_unlock)
 497 hidden_proto (__pthread_key_create)
 498 hidden_proto (__pthread_getspecific)
 499 hidden_proto (__pthread_setspecific)
 500 hidden_proto (__pthread_once)
 501 #endif
 502
 503 extern int __pthread_cond_broadcast_2_0 (pthread_cond_2_0_t *cond);
 504 extern int __pthread_cond_destroy_2_0 (pthread_cond_2_0_t *cond);
 505 extern int __pthread_cond_init_2_0 (pthread_cond_2_0_t *cond,
 506                                     const pthread_condattr_t *cond_attr);
 507 extern int __pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond);
 508 extern int __pthread_cond_timedwait_2_0 (pthread_cond_2_0_t *cond,
 509                                          pthread_mutex_t *mutex,
 510                                          const struct timespec *abstime);
 511 extern int __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond,
 512                                     pthread_mutex_t *mutex);
 513
 514 extern int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize,
 515                                      cpu_set_t *cpuset);
 516
 517 /* The two functions are in libc.so and not exported.  */
 518 extern int __libc_enable_asynccancel (void) attribute_hidden;
 519 extern void __libc_disable_asynccancel (int oldtype)
 520      internal_function attribute_hidden;
 521
 522
 523 /* The two functions are in librt.so and not exported.  */
 524 extern int __librt_enable_asynccancel (void) attribute_hidden;
 525 extern void __librt_disable_asynccancel (int oldtype)
 526      internal_function attribute_hidden;
 527
 528 #ifdef IS_IN_libpthread
 529 /* Special versions which use non-exported functions.  */
 530 extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 531                                     void (*routine) (void *), void *arg)
 532      attribute_hidden;
 533 # undef pthread_cleanup_push
 534 # define pthread_cleanup_push(routine,arg) \
 535   { struct _pthread_cleanup_buffer _buffer;                                   \
 536     __pthread_cleanup_push (&_buffer, (routine), (arg));
 537
 538 extern void __pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 539                                    int execute) attribute_hidden;
 540 # undef pthread_cleanup_pop
 541 # define pthread_cleanup_pop(execute) \
 542     __pthread_cleanup_pop (&_buffer, (execute)); }
 543 #endif
 544
 545 extern void __pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 546                                           void (*routine) (void *), void *arg);
 547 extern void __pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 548                                            int execute);
 549
 550 /* Old cleanup interfaces, still used in libc.so.  */
 551 extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 552                                    void (*routine) (void *), void *arg);
 553 extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 554                                   int execute);
 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 extern void __nptl_deallocate_tsd (void) attribute_hidden;
 561
 562 extern void __nptl_setxid_error (struct xid_command *cmdp, int error)
 563   attribute_hidden;
 564 extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
 565 #ifndef SHARED
 566 extern void __nptl_set_robust (struct pthread *self);
 567 #endif
 568
 569 extern void __free_stacks (size_t limit) attribute_hidden;
 570
 571 extern void __wait_lookup_done (void) attribute_hidden;
 572
 573 #ifdef SHARED
 574 # define PTHREAD_STATIC_FN_REQUIRE(name)
 575 #else
 576 # define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
 577 #endif
 578
 579 /* Test if the mutex is suitable for the FUTEX_WAIT_REQUEUE_PI operation.  */
 580 #if (defined lll_futex_wait_requeue_pi \
 581      && defined __ASSUME_REQUEUE_PI)
 582 # define USE_REQUEUE_PI(mut) \
 583    ((mut) && (mut) != (void *) ~0l \
 584     && (((mut)->__data.__kind \
 585          & (PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_NORMAL_NP)) \
 586         == PTHREAD_MUTEX_PRIO_INHERIT_NP))
 587 #else
 588 # define USE_REQUEUE_PI(mut) 0
 589 #endif
 590
 591 /* Returns 0 if POL is a valid scheduling policy.  */
 592 static inline int
 593 check_sched_policy_attr (int pol)
 594 {
 595   if (pol == SCHED_OTHER || pol == SCHED_FIFO || pol == SCHED_RR)
 596     return 0;
 597
 598   return EINVAL;
 599 }
 600
 601 /* Returns 0 if PR is within the accepted range of priority values for
 602    the scheduling policy POL or EINVAL otherwise.  */
 603 static inline int
 604 check_sched_priority_attr (int pr, int pol)
 605 {
 606   int min = __sched_get_priority_min (pol);
 607   int max = __sched_get_priority_max (pol);
 608
 609   if (min >= 0 && max >= 0 && pr >= min && pr <= max)
 610     return 0;
 611
 612   return EINVAL;
 613 }
 614
 615 /* Returns 0 if ST is a valid stack size for a thread stack and EINVAL
 616    otherwise.  */
 617 static inline int
 618 check_stacksize_attr (size_t st)
 619 {
 620   if (st >= PTHREAD_STACK_MIN)
 621     return 0;
 622
 623   return EINVAL;
 624 }
 625
 626 /* Defined in pthread_setaffinity.c.  */
 627 extern size_t __kernel_cpumask_size attribute_hidden;
 628 extern int __determine_cpumask_size (pid_t tid);
 629
 630 /* Returns 0 if CS and SZ are valid values for the cpuset and cpuset size
 631    respectively.  Otherwise it returns an error number.  */
 632 static inline int
 633 check_cpuset_attr (const cpu_set_t *cs, const size_t sz)
 634 {
 635   if (__kernel_cpumask_size == 0)
 636     {
 637       int res = __determine_cpumask_size (THREAD_SELF->tid);
 638       if (res)
 639         return res;
 640     }
 641
 642   /* Check whether the new bitmask has any bit set beyond the
 643      last one the kernel accepts.  */
 644   for (size_t cnt = __kernel_cpumask_size; cnt < sz; ++cnt)
 645     if (((char *) cs)[cnt] != '\0')
 646       /* Found a nonzero byte.  This means the user request cannot be
 647          fulfilled.  */
 648       return EINVAL;
 649
 650   return 0;
 651 }
 652
 653 #endif  /* pthreadP.h */