nptl/pthreadP.h

   1 /* Copyright (C) 2002, 2003, 2004, 2005 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _PTHREADP_H
  21 #define _PTHREADP_H     1
  22
  23 #include <pthread.h>
  24 #include <setjmp.h>
  25 #include <stdbool.h>
  26 #include <sys/syscall.h>
  27 #include "descr.h"
  28 #include <tls.h>
  29 #include <lowlevellock.h>
  30 #include <stackinfo.h>
  31 #include <internaltypes.h>
  32 #include <pthread-functions.h>
  33 #include <atomic.h>
  34
  35
  36 /* Atomic operations on TLS memory.  */
  37 #ifndef THREAD_ATOMIC_CMPXCHG_VAL
  38 # define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, new, old) \
  39   atomic_compare_and_exchange_val_acq (&(descr)->member, new, old)
  40 #endif
  41
  42 #ifndef THREAD_ATOMIC_BIT_SET
  43 # define THREAD_ATOMIC_BIT_SET(descr, member, bit) \
  44   atomic_bit_set (&(descr)->member, bit)
  45 #endif
  46
  47
  48 /* Adaptive mutex definitions.  */
  49 #ifndef MAX_ADAPTIVE_COUNT
  50 # define MAX_ADAPTIVE_COUNT 100
  51 #endif
  52
  53
  54 /* Magic cookie representing robust mutex with dead owner.  */
  55 #define PTHREAD_MUTEX_OWNERDEAD         INT_MAX
  56 /* Magic cookie representing not recoverable robust mutex.  */
  57 #define PTHREAD_MUTEX_NOTRECOVERABLE    (INT_MAX - 1)
  58
  59
  60 /* Internal mutex type value.  */
  61 enum
  62 {
  63   PTHREAD_MUTEX_ROBUST_PRIVATE_NP = 256,
  64   PTHREAD_MUTEX_ROBUST_PRIVATE_RECURSIVE_NP
  65   = PTHREAD_MUTEX_ROBUST_PRIVATE_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  66   PTHREAD_MUTEX_ROBUST_PRIVATE_ERRORCHECK_NP
  67   = PTHREAD_MUTEX_ROBUST_PRIVATE_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
  68   PTHREAD_MUTEX_ROBUST_PRIVATE_ADAPTIVE_NP
  69   = PTHREAD_MUTEX_ROBUST_PRIVATE_NP | PTHREAD_MUTEX_ADAPTIVE_NP
  70 };
  71
  72
  73 /* Flags in mutex attr.  */
  74 #define PTHREAD_MUTEXATTR_FLAG_ROBUST   0x40000000
  75 #define PTHREAD_MUTEXATTR_FLAG_PSHARED  0x80000000
  76 #define PTHREAD_MUTEXATTR_FLAG_BITS \
  77   (PTHREAD_MUTEXATTR_FLAG_ROBUST | PTHREAD_MUTEXATTR_FLAG_PSHARED)
  78
  79
  80 /* Internal variables.  */
  81
  82
  83 /* Default stack size.  */
  84 extern size_t __default_stacksize attribute_hidden;
  85
  86 /* Size and alignment of static TLS block.  */
  87 extern size_t __static_tls_size attribute_hidden;
  88 extern size_t __static_tls_align_m1 attribute_hidden;
  89
  90 /* Flag whether the machine is SMP or not.  */
  91 extern int __is_smp attribute_hidden;
  92
  93 /* Thread descriptor handling.  */
  94 extern list_t __stack_user;
  95 hidden_proto (__stack_user)
  96
  97 /* Attribute handling.  */
  98 extern struct pthread_attr *__attr_list attribute_hidden;
  99 extern lll_lock_t __attr_list_lock attribute_hidden;
 100
 101 /* First available RT signal.  */
 102 extern int __current_sigrtmin attribute_hidden;
 103 /* Last available RT signal.  */
 104 extern int __current_sigrtmax attribute_hidden;
 105
 106 /* Concurrency handling.  */
 107 extern int __concurrency_level attribute_hidden;
 108
 109 /* Thread-local data key handling.  */
 110 extern struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX];
 111 hidden_proto (__pthread_keys)
 112
 113 /* Number of threads running.  */
 114 extern unsigned int __nptl_nthreads attribute_hidden;
 115
 116 /* The library can run in debugging mode where it performs a lot more
 117    tests.  */
 118 extern int __pthread_debug attribute_hidden;
 119 /** For now disable debugging support.  */
 120 #if 0
 121 # define DEBUGGING_P __builtin_expect (__pthread_debug, 0)
 122 # define INVALID_TD_P(pd) (DEBUGGING_P && __find_in_stack_list (pd) == NULL)
 123 # define INVALID_NOT_TERMINATED_TD_P(pd) INVALID_TD_P (pd)
 124 #else
 125 # define DEBUGGING_P 0
 126 /* Simplified test.  This will not catch all invalid descriptors but
 127    is better than nothing.  And if the test triggers the thread
 128    descriptor is guaranteed to be invalid.  */
 129 # define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0)
 130 # define INVALID_NOT_TERMINATED_TD_P(pd) __builtin_expect ((pd)->tid < 0, 0)
 131 #endif
 132
 133
 134 /* Cancellation test.  */
 135 #define CANCELLATION_P(self) \
 136   do {                                                                        \
 137     int cancelhandling = THREAD_GETMEM (self, cancelhandling);                \
 138     if (CANCEL_ENABLED_AND_CANCELED (cancelhandling))                         \
 139       {                                                                       \
 140         THREAD_SETMEM (self, result, PTHREAD_CANCELED);                       \
 141         __do_cancel ();                                                       \
 142       }                                                                       \
 143   } while (0)
 144
 145
 146 extern void __pthread_unwind (__pthread_unwind_buf_t *__buf)
 147      __cleanup_fct_attribute __attribute ((__noreturn__))
 148 #if !defined SHARED && !defined IS_IN_libpthread
 149      weak_function
 150 #endif
 151      ;
 152 extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
 153      __cleanup_fct_attribute __attribute ((__noreturn__))
 154 #ifndef SHARED
 155      weak_function
 156 #endif
 157      ;
 158 extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
 159      __cleanup_fct_attribute;
 160 extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
 161      __cleanup_fct_attribute;
 162 #if defined NOT_IN_libc && defined IS_IN_libpthread
 163 hidden_proto (__pthread_unwind)
 164 hidden_proto (__pthread_unwind_next)
 165 hidden_proto (__pthread_register_cancel)
 166 hidden_proto (__pthread_unregister_cancel)
 167 # ifdef SHARED
 168 extern void attribute_hidden pthread_cancel_init (void);
 169 # endif
 170 #endif
 171
 172
 173 /* Called when a thread reacts on a cancellation request.  */
 174 static inline void
 175 __attribute ((noreturn, always_inline))
 176 __do_cancel (void)
 177 {
 178   struct pthread *self = THREAD_SELF;
 179
 180   /* Make sure we get no more cancellations.  */
 181   THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT);
 182
 183   __pthread_unwind ((__pthread_unwind_buf_t *)
 184                     THREAD_GETMEM (self, cleanup_jmp_buf));
 185 }
 186
 187
 188 /* Set cancellation mode to asynchronous.  */
 189 #define CANCEL_ASYNC() \
 190   __pthread_enable_asynccancel ()
 191 /* Reset to previous cancellation mode.  */
 192 #define CANCEL_RESET(oldtype) \
 193   __pthread_disable_asynccancel (oldtype)
 194
 195 #if !defined NOT_IN_libc
 196 /* Same as CANCEL_ASYNC, but for use in libc.so.  */
 197 # define LIBC_CANCEL_ASYNC() \
 198   __libc_enable_asynccancel ()
 199 /* Same as CANCEL_RESET, but for use in libc.so.  */
 200 # define LIBC_CANCEL_RESET(oldtype) \
 201   __libc_disable_asynccancel (oldtype)
 202 # define LIBC_CANCEL_HANDLED() \
 203   __asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
 204   __asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
 205 #elif defined NOT_IN_libc && defined IS_IN_libpthread
 206 # define LIBC_CANCEL_ASYNC() CANCEL_ASYNC ()
 207 # define LIBC_CANCEL_RESET(val) CANCEL_RESET (val)
 208 # define LIBC_CANCEL_HANDLED() \
 209   __asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
 210   __asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
 211 #elif defined NOT_IN_libc && defined IS_IN_librt
 212 # define LIBC_CANCEL_ASYNC() \
 213   __librt_enable_asynccancel ()
 214 # define LIBC_CANCEL_RESET(val) \
 215   __librt_disable_asynccancel (val)
 216 # define LIBC_CANCEL_HANDLED() \
 217   __asm (".globl " __SYMBOL_PREFIX "__librt_enable_asynccancel"); \
 218   __asm (".globl " __SYMBOL_PREFIX "__librt_disable_asynccancel")
 219 #else
 220 # define LIBC_CANCEL_ASYNC()    0 /* Just a dummy value.  */
 221 # define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it.  */
 222 # define LIBC_CANCEL_HANDLED()  /* Nothing.  */
 223 #endif
 224
 225 /* The signal used for asynchronous cancelation.  */
 226 #define SIGCANCEL       __SIGRTMIN
 227
 228
 229 /* Signal needed for the kernel-supported POSIX timer implementation.
 230    We can reuse the cancellation signal since we can distinguish
 231    cancellation from timer expirations.  */
 232 #define SIGTIMER        SIGCANCEL
 233
 234
 235 /* Signal used to implement the setuid et.al. functions.  */
 236 #define SIGSETXID       (__SIGRTMIN + 1)
 237
 238 /* Used to communicate with signal handler.  */
 239 extern struct xid_command *__xidcmd attribute_hidden;
 240
 241
 242 /* Internal prototypes.  */
 243
 244 /* Thread list handling.  */
 245 extern struct pthread *__find_in_stack_list (struct pthread *pd)
 246      attribute_hidden internal_function;
 247
 248 /* Deallocate a thread's stack after optionally making sure the thread
 249    descriptor is still valid.  */
 250 extern void __free_tcb (struct pthread *pd) attribute_hidden internal_function;
 251
 252 /* Free allocated stack.  */
 253 extern void __deallocate_stack (struct pthread *pd)
 254      attribute_hidden internal_function;
 255
 256 /* Mark all the stacks except for the current one as available.  This
 257    function also re-initializes the lock for the stack cache.  */
 258 extern void __reclaim_stacks (void) attribute_hidden;
 259
 260 /* Make all threads's stacks executable.  */
 261 extern int __make_stacks_executable (void **stack_endp)
 262      internal_function attribute_hidden;
 263
 264 /* longjmp handling.  */
 265 extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
 266 #if defined NOT_IN_libc && defined IS_IN_libpthread
 267 hidden_proto (__pthread_cleanup_upto)
 268 #endif
 269
 270
 271 /* Functions with versioned interfaces.  */
 272 extern int __pthread_create_2_1 (pthread_t *newthread,
 273                                  const pthread_attr_t *attr,
 274                                  void *(*start_routine) (void *), void *arg);
 275 extern int __pthread_create_2_0 (pthread_t *newthread,
 276                                  const pthread_attr_t *attr,
 277                                  void *(*start_routine) (void *), void *arg);
 278 extern int __pthread_attr_init_2_1 (pthread_attr_t *attr);
 279 extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
 280
 281
 282 /* Event handlers for libthread_db interface.  */
 283 extern void __nptl_create_event (void);
 284 extern void __nptl_death_event (void);
 285 hidden_proto (__nptl_create_event)
 286 hidden_proto (__nptl_death_event)
 287
 288 /* Register the generation counter in the libpthread with the libc.  */
 289 #ifdef TLS_MULTIPLE_THREADS_IN_TCB
 290 extern void __libc_pthread_init (unsigned long int *ptr,
 291                                  void (*reclaim) (void),
 292                                  const struct pthread_functions *functions)
 293      internal_function;
 294 #else
 295 extern int *__libc_pthread_init (unsigned long int *ptr,
 296                                  void (*reclaim) (void),
 297                                  const struct pthread_functions *functions)
 298      internal_function;
 299
 300 /* Variable set to a nonzero value if more than one thread runs or ran.  */
 301 extern int __pthread_multiple_threads attribute_hidden;
 302 /* Pointer to the corresponding variable in libc.  */
 303 extern int *__libc_multiple_threads_ptr attribute_hidden;
 304 #endif
 305
 306 /* Find a thread given its TID.  */
 307 extern struct pthread *__find_thread_by_id (pid_t tid) attribute_hidden
 308 #ifdef SHARED
 309 ;
 310 #else
 311 weak_function;
 312 #define __find_thread_by_id(tid) \
 313   (__find_thread_by_id ? (__find_thread_by_id) (tid) : (struct pthread *) NULL)
 314 #endif
 315
 316 extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
 317
 318
 319 /* Namespace save aliases.  */
 320 extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
 321                                     struct sched_param *param);
 322 extern int __pthread_setschedparam (pthread_t thread_id, int policy,
 323                                     const struct sched_param *param);
 324 extern int __pthread_setcancelstate (int state, int *oldstate);
 325 extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 326                                  __const pthread_mutexattr_t *__mutexattr);
 327 extern int __pthread_mutex_init_internal (pthread_mutex_t *__mutex,
 328                                           __const pthread_mutexattr_t *__mutexattr)
 329      attribute_hidden;
 330 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 331 extern int __pthread_mutex_destroy_internal (pthread_mutex_t *__mutex)
 332      attribute_hidden;
 333 extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
 334 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
 335 extern int __pthread_mutex_lock_internal (pthread_mutex_t *__mutex)
 336      attribute_hidden;
 337 extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
 338      attribute_hidden internal_function;
 339 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 340 extern int __pthread_mutex_unlock_internal (pthread_mutex_t *__mutex)
 341      attribute_hidden;
 342 extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
 343                                            int __decr)
 344      attribute_hidden internal_function;
 345 extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
 346 extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
 347 extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
 348 extern int __pthread_attr_destroy (pthread_attr_t *attr);
 349 extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
 350                                           int *detachstate);
 351 extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
 352                                           int detachstate);
 353 extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
 354                                            int *inherit);
 355 extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
 356 extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
 357                                          struct sched_param *param);
 358 extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
 359                                          const struct sched_param *param);
 360 extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
 361                                           int *policy);
 362 extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
 363 extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
 364 extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
 365 extern int __pthread_attr_getstackaddr (__const pthread_attr_t *__restrict
 366                                         __attr, void **__restrict __stackaddr);
 367 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 368                                         void *__stackaddr);
 369 extern int __pthread_attr_getstacksize (__const pthread_attr_t *__restrict
 370                                         __attr,
 371                                         size_t *__restrict __stacksize);
 372 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 373                                         size_t __stacksize);
 374 extern int __pthread_attr_getstack (__const pthread_attr_t *__restrict __attr,
 375                                     void **__restrict __stackaddr,
 376                                     size_t *__restrict __stacksize);
 377 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 378                                     size_t __stacksize);
 379 extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
 380                                   __const pthread_rwlockattr_t *__restrict
 381                                   __attr);
 382 extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
 383 extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
 384 extern int __pthread_rwlock_rdlock_internal (pthread_rwlock_t *__rwlock);
 385 extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
 386 extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
 387 extern int __pthread_rwlock_wrlock_internal (pthread_rwlock_t *__rwlock);
 388 extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
 389 extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
 390 extern int __pthread_rwlock_unlock_internal (pthread_rwlock_t *__rwlock);
 391 extern int __pthread_cond_broadcast (pthread_cond_t *cond);
 392 extern int __pthread_cond_destroy (pthread_cond_t *cond);
 393 extern int __pthread_cond_init (pthread_cond_t *cond,
 394                                 const pthread_condattr_t *cond_attr);
 395 extern int __pthread_cond_signal (pthread_cond_t *cond);
 396 extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 397 extern int __pthread_cond_timedwait (pthread_cond_t *cond,
 398                                      pthread_mutex_t *mutex,
 399                                      const struct timespec *abstime);
 400 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 401 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 402 extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
 403 extern int __pthread_key_create_internal (pthread_key_t *key,
 404                                           void (*destr) (void *));
 405 extern void *__pthread_getspecific (pthread_key_t key);
 406 extern void *__pthread_getspecific_internal (pthread_key_t key);
 407 extern int __pthread_setspecific (pthread_key_t key, const void *value);
 408 extern int __pthread_setspecific_internal (pthread_key_t key,
 409                                            const void *value);
 410 extern int __pthread_once (pthread_once_t *once_control,
 411                            void (*init_routine) (void));
 412 extern int __pthread_once_internal (pthread_once_t *once_control,
 413                                     void (*init_routine) (void));
 414 extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
 415                              void (*child) (void));
 416 extern pthread_t __pthread_self (void);
 417 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
 418 extern int __pthread_kill (pthread_t threadid, int signo);
 419 extern void __pthread_exit (void *value);
 420 extern int __pthread_setcanceltype (int type, int *oldtype);
 421 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 422 extern void __pthread_disable_asynccancel (int oldtype)
 423      internal_function attribute_hidden;
 424
 425 extern int __pthread_cond_broadcast_2_0 (pthread_cond_2_0_t *cond);
 426 extern int __pthread_cond_destroy_2_0 (pthread_cond_2_0_t *cond);
 427 extern int __pthread_cond_init_2_0 (pthread_cond_2_0_t *cond,
 428                                     const pthread_condattr_t *cond_attr);
 429 extern int __pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond);
 430 extern int __pthread_cond_timedwait_2_0 (pthread_cond_2_0_t *cond,
 431                                          pthread_mutex_t *mutex,
 432                                          const struct timespec *abstime);
 433 extern int __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond,
 434                                     pthread_mutex_t *mutex);
 435
 436 extern int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize,
 437                                      cpu_set_t *cpuset);
 438
 439 /* The two functions are in libc.so and not exported.  */
 440 extern int __libc_enable_asynccancel (void) attribute_hidden;
 441 extern void __libc_disable_asynccancel (int oldtype)
 442      internal_function attribute_hidden;
 443
 444
 445 /* The two functions are in librt.so and not exported.  */
 446 extern int __librt_enable_asynccancel (void) attribute_hidden;
 447 extern void __librt_disable_asynccancel (int oldtype)
 448      internal_function attribute_hidden;
 449
 450 #ifdef IS_IN_libpthread
 451 /* Special versions which use non-exported functions.  */
 452 extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 453                                     void (*routine) (void *), void *arg)
 454      attribute_hidden;
 455 # undef pthread_cleanup_push
 456 # define pthread_cleanup_push(routine,arg) \
 457   { struct _pthread_cleanup_buffer _buffer;                                   \
 458     __pthread_cleanup_push (&_buffer, (routine), (arg));
 459
 460 extern void __pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 461                                    int execute) attribute_hidden;
 462 # undef pthread_cleanup_pop
 463 # define pthread_cleanup_pop(execute) \
 464     __pthread_cleanup_pop (&_buffer, (execute)); }
 465 #endif
 466
 467 extern void __pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 468                                           void (*routine) (void *), void *arg);
 469 extern void __pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 470                                            int execute);
 471
 472 /* Old cleanup interfaces, still used in libc.so.  */
 473 extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 474                                    void (*routine) (void *), void *arg);
 475 extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 476                                   int execute);
 477 extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 478                                          void (*routine) (void *), void *arg);
 479 extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 480                                           int execute);
 481
 482 extern void __nptl_deallocate_tsd (void) attribute_hidden;
 483
 484 extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
 485
 486 #ifdef SHARED
 487 # define PTHREAD_STATIC_FN_REQUIRE(name)
 488 #else
 489 # define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
 490 #endif
 491
 492 #endif  /* pthreadP.h */