nptl/pthreadP.h

   1 /* Copyright (C) 2002-2013 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
  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_INCONSISTENT      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_KIND_MASK_NP = 3,
  64
  65   PTHREAD_MUTEX_ELISION_NP    = 256,
  66   PTHREAD_MUTEX_NO_ELISION_NP = 512,
  67
  68   PTHREAD_MUTEX_ROBUST_NORMAL_NP = 16,
  69   PTHREAD_MUTEX_ROBUST_RECURSIVE_NP
  70   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  71   PTHREAD_MUTEX_ROBUST_ERRORCHECK_NP
  72   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
  73   PTHREAD_MUTEX_ROBUST_ADAPTIVE_NP
  74   = PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
  75   PTHREAD_MUTEX_PRIO_INHERIT_NP = 32,
  76   PTHREAD_MUTEX_PI_NORMAL_NP
  77   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_NORMAL,
  78   PTHREAD_MUTEX_PI_RECURSIVE_NP
  79   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  80   PTHREAD_MUTEX_PI_ERRORCHECK_NP
  81   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
  82   PTHREAD_MUTEX_PI_ADAPTIVE_NP
  83   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
  84   PTHREAD_MUTEX_PI_ROBUST_NORMAL_NP
  85   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_NORMAL_NP,
  86   PTHREAD_MUTEX_PI_ROBUST_RECURSIVE_NP
  87   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_RECURSIVE_NP,
  88   PTHREAD_MUTEX_PI_ROBUST_ERRORCHECK_NP
  89   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_ERRORCHECK_NP,
  90   PTHREAD_MUTEX_PI_ROBUST_ADAPTIVE_NP
  91   = PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_ADAPTIVE_NP,
  92   PTHREAD_MUTEX_PRIO_PROTECT_NP = 64,
  93   PTHREAD_MUTEX_PP_NORMAL_NP
  94   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_NORMAL,
  95   PTHREAD_MUTEX_PP_RECURSIVE_NP
  96   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_RECURSIVE_NP,
  97   PTHREAD_MUTEX_PP_ERRORCHECK_NP
  98   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
  99   PTHREAD_MUTEX_PP_ADAPTIVE_NP
 100   = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
 101   PTHREAD_MUTEX_ELISION_FLAGS_NP
 102   = PTHREAD_MUTEX_ELISION_NP | PTHREAD_MUTEX_NO_ELISION_NP,
 103
 104   PTHREAD_MUTEX_TIMED_ELISION_NP =
 105           PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_ELISION_NP,
 106   PTHREAD_MUTEX_TIMED_NO_ELISION_NP =
 107           PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_NO_ELISION_NP,
 108 };
 109 #define PTHREAD_MUTEX_PSHARED_BIT 128
 110
 111 #define PTHREAD_MUTEX_TYPE(m) \
 112   ((m)->__data.__kind & 127)
 113 /* Don't include NO_ELISION, as that type is always the same
 114    as the underlying lock type.  */
 115 #define PTHREAD_MUTEX_TYPE_ELISION(m) \
 116   ((m)->__data.__kind & (127|PTHREAD_MUTEX_ELISION_NP))
 117
 118 #if LLL_PRIVATE == 0 && LLL_SHARED == 128
 119 # define PTHREAD_MUTEX_PSHARED(m) \
 120   ((m)->__data.__kind & 128)
 121 #else
 122 # define PTHREAD_MUTEX_PSHARED(m) \
 123   (((m)->__data.__kind & 128) ? LLL_SHARED : LLL_PRIVATE)
 124 #endif
 125
 126 /* The kernel when waking robust mutexes on exit never uses
 127    FUTEX_PRIVATE_FLAG FUTEX_WAKE.  */
 128 #define PTHREAD_ROBUST_MUTEX_PSHARED(m) LLL_SHARED
 129
 130 /* Ceiling in __data.__lock.  __data.__lock is signed, so don't
 131    use the MSB bit in there, but in the mask also include that bit,
 132    so that the compiler can optimize & PTHREAD_MUTEX_PRIO_CEILING_MASK
 133    masking if the value is then shifted down by
 134    PTHREAD_MUTEX_PRIO_CEILING_SHIFT.  */
 135 #define PTHREAD_MUTEX_PRIO_CEILING_SHIFT        19
 136 #define PTHREAD_MUTEX_PRIO_CEILING_MASK         0xfff80000
 137
 138
 139 /* Flags in mutex attr.  */
 140 #define PTHREAD_MUTEXATTR_PROTOCOL_SHIFT        28
 141 #define PTHREAD_MUTEXATTR_PROTOCOL_MASK         0x30000000
 142 #define PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT    12
 143 #define PTHREAD_MUTEXATTR_PRIO_CEILING_MASK     0x00fff000
 144 #define PTHREAD_MUTEXATTR_FLAG_ROBUST           0x40000000
 145 #define PTHREAD_MUTEXATTR_FLAG_PSHARED          0x80000000
 146 #define PTHREAD_MUTEXATTR_FLAG_BITS \
 147   (PTHREAD_MUTEXATTR_FLAG_ROBUST | PTHREAD_MUTEXATTR_FLAG_PSHARED \
 148    | PTHREAD_MUTEXATTR_PROTOCOL_MASK | PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
 149
 150
 151 /* Check whether rwlock prefers readers.   */
 152 #define PTHREAD_RWLOCK_PREFER_READER_P(rwlock) \
 153   ((rwlock)->__data.__flags == 0)
 154
 155
 156 /* Bits used in robust mutex implementation.  */
 157 #define FUTEX_WAITERS           0x80000000
 158 #define FUTEX_OWNER_DIED        0x40000000
 159 #define FUTEX_TID_MASK          0x3fffffff
 160
 161
 162 /* Internal variables.  */
 163
 164
 165 /* Default pthread attributes.  */
 166 extern struct pthread_attr __default_pthread_attr attribute_hidden;
 167 extern int __default_pthread_attr_lock attribute_hidden;
 168
 169 /* Size and alignment of static TLS block.  */
 170 extern size_t __static_tls_size attribute_hidden;
 171 extern size_t __static_tls_align_m1 attribute_hidden;
 172
 173 /* Flag whether the machine is SMP or not.  */
 174 extern int __is_smp attribute_hidden;
 175
 176 /* Thread descriptor handling.  */
 177 extern list_t __stack_user;
 178 hidden_proto (__stack_user)
 179
 180 /* Attribute handling.  */
 181 extern struct pthread_attr *__attr_list attribute_hidden;
 182 extern int __attr_list_lock attribute_hidden;
 183
 184 /* First available RT signal.  */
 185 extern int __current_sigrtmin attribute_hidden;
 186 /* Last available RT signal.  */
 187 extern int __current_sigrtmax attribute_hidden;
 188
 189 /* Concurrency handling.  */
 190 extern int __concurrency_level attribute_hidden;
 191
 192 /* Thread-local data key handling.  */
 193 extern struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX];
 194 hidden_proto (__pthread_keys)
 195
 196 /* Number of threads running.  */
 197 extern unsigned int __nptl_nthreads attribute_hidden;
 198
 199 #ifndef __ASSUME_SET_ROBUST_LIST
 200 /* Negative if we do not have the system call and we can use it.  */
 201 extern int __set_robust_list_avail attribute_hidden;
 202 #endif
 203
 204 /* Thread Priority Protection.  */
 205 extern int __sched_fifo_min_prio attribute_hidden;
 206 extern int __sched_fifo_max_prio attribute_hidden;
 207 extern void __init_sched_fifo_prio (void) attribute_hidden;
 208 extern int __pthread_tpp_change_priority (int prev_prio, int new_prio)
 209      attribute_hidden;
 210 extern int __pthread_current_priority (void) attribute_hidden;
 211
 212 /* The library can run in debugging mode where it performs a lot more
 213    tests.  */
 214 extern int __pthread_debug attribute_hidden;
 215 /** For now disable debugging support.  */
 216 #if 0
 217 # define DEBUGGING_P __builtin_expect (__pthread_debug, 0)
 218 # define INVALID_TD_P(pd) (DEBUGGING_P && __find_in_stack_list (pd) == NULL)
 219 # define INVALID_NOT_TERMINATED_TD_P(pd) INVALID_TD_P (pd)
 220 #else
 221 # define DEBUGGING_P 0
 222 /* Simplified test.  This will not catch all invalid descriptors but
 223    is better than nothing.  And if the test triggers the thread
 224    descriptor is guaranteed to be invalid.  */
 225 # define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0)
 226 # define INVALID_NOT_TERMINATED_TD_P(pd) __builtin_expect ((pd)->tid < 0, 0)
 227 #endif
 228
 229
 230 /* Cancellation test.  */
 231 #define CANCELLATION_P(self) \
 232   do {                                                                        \
 233     int cancelhandling = THREAD_GETMEM (self, cancelhandling);                \
 234     if (CANCEL_ENABLED_AND_CANCELED (cancelhandling))                         \
 235       {                                                                       \
 236         THREAD_SETMEM (self, result, PTHREAD_CANCELED);                       \
 237         __do_cancel ();                                                       \
 238       }                                                                       \
 239   } while (0)
 240
 241
 242 extern void __pthread_unwind (__pthread_unwind_buf_t *__buf)
 243      __cleanup_fct_attribute __attribute ((__noreturn__))
 244 #if !defined SHARED && !defined IS_IN_libpthread
 245      weak_function
 246 #endif
 247      ;
 248 extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
 249      __cleanup_fct_attribute __attribute ((__noreturn__))
 250 #ifndef SHARED
 251      weak_function
 252 #endif
 253      ;
 254 extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
 255      __cleanup_fct_attribute;
 256 extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
 257      __cleanup_fct_attribute;
 258 #if defined NOT_IN_libc && defined IS_IN_libpthread
 259 hidden_proto (__pthread_unwind)
 260 hidden_proto (__pthread_unwind_next)
 261 hidden_proto (__pthread_register_cancel)
 262 hidden_proto (__pthread_unregister_cancel)
 263 # ifdef SHARED
 264 extern void attribute_hidden pthread_cancel_init (void);
 265 extern void __unwind_freeres (void);
 266 # endif
 267 #endif
 268
 269
 270 /* Called when a thread reacts on a cancellation request.  */
 271 static inline void
 272 __attribute ((noreturn, always_inline))
 273 __do_cancel (void)
 274 {
 275   struct pthread *self = THREAD_SELF;
 276
 277   /* Make sure we get no more cancellations.  */
 278   THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT);
 279
 280   __pthread_unwind ((__pthread_unwind_buf_t *)
 281                     THREAD_GETMEM (self, cleanup_jmp_buf));
 282 }
 283
 284
 285 /* Set cancellation mode to asynchronous.  */
 286 #define CANCEL_ASYNC() \
 287   __pthread_enable_asynccancel ()
 288 /* Reset to previous cancellation mode.  */
 289 #define CANCEL_RESET(oldtype) \
 290   __pthread_disable_asynccancel (oldtype)
 291
 292 #if !defined NOT_IN_libc
 293 /* Same as CANCEL_ASYNC, but for use in libc.so.  */
 294 # define LIBC_CANCEL_ASYNC() \
 295   __libc_enable_asynccancel ()
 296 /* Same as CANCEL_RESET, but for use in libc.so.  */
 297 # define LIBC_CANCEL_RESET(oldtype) \
 298   __libc_disable_asynccancel (oldtype)
 299 # define LIBC_CANCEL_HANDLED() \
 300   __asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
 301   __asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
 302 #elif defined NOT_IN_libc && defined IS_IN_libpthread
 303 # define LIBC_CANCEL_ASYNC() CANCEL_ASYNC ()
 304 # define LIBC_CANCEL_RESET(val) CANCEL_RESET (val)
 305 # define LIBC_CANCEL_HANDLED() \
 306   __asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
 307   __asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
 308 #elif defined NOT_IN_libc && defined IS_IN_librt
 309 # define LIBC_CANCEL_ASYNC() \
 310   __librt_enable_asynccancel ()
 311 # define LIBC_CANCEL_RESET(val) \
 312   __librt_disable_asynccancel (val)
 313 # define LIBC_CANCEL_HANDLED() \
 314   __asm (".globl " __SYMBOL_PREFIX "__librt_enable_asynccancel"); \
 315   __asm (".globl " __SYMBOL_PREFIX "__librt_disable_asynccancel")
 316 #else
 317 # define LIBC_CANCEL_ASYNC()    0 /* Just a dummy value.  */
 318 # define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it.  */
 319 # define LIBC_CANCEL_HANDLED()  /* Nothing.  */
 320 #endif
 321
 322 /* The signal used for asynchronous cancelation.  */
 323 #define SIGCANCEL       __SIGRTMIN
 324
 325
 326 /* Signal needed for the kernel-supported POSIX timer implementation.
 327    We can reuse the cancellation signal since we can distinguish
 328    cancellation from timer expirations.  */
 329 #define SIGTIMER        SIGCANCEL
 330
 331
 332 /* Signal used to implement the setuid et.al. functions.  */
 333 #define SIGSETXID       (__SIGRTMIN + 1)
 334
 335 /* Used to communicate with signal handler.  */
 336 extern struct xid_command *__xidcmd attribute_hidden;
 337
 338
 339 /* Internal prototypes.  */
 340
 341 /* Thread list handling.  */
 342 extern struct pthread *__find_in_stack_list (struct pthread *pd)
 343      attribute_hidden internal_function;
 344
 345 /* Deallocate a thread's stack after optionally making sure the thread
 346    descriptor is still valid.  */
 347 extern void __free_tcb (struct pthread *pd) attribute_hidden internal_function;
 348
 349 /* Free allocated stack.  */
 350 extern void __deallocate_stack (struct pthread *pd)
 351      attribute_hidden internal_function;
 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)
 359      internal_function attribute_hidden;
 360
 361 /* longjmp handling.  */
 362 extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
 363 #if defined NOT_IN_libc && defined IS_IN_libpthread
 364 hidden_proto (__pthread_cleanup_upto)
 365 #endif
 366
 367
 368 /* Functions with versioned interfaces.  */
 369 extern int __pthread_create_2_1 (pthread_t *newthread,
 370                                  const pthread_attr_t *attr,
 371                                  void *(*start_routine) (void *), void *arg);
 372 extern int __pthread_create_2_0 (pthread_t *newthread,
 373                                  const pthread_attr_t *attr,
 374                                  void *(*start_routine) (void *), void *arg);
 375 extern int __pthread_attr_init_2_1 (pthread_attr_t *attr);
 376 extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
 377
 378
 379 /* Event handlers for libthread_db interface.  */
 380 extern void __nptl_create_event (void);
 381 extern void __nptl_death_event (void);
 382 hidden_proto (__nptl_create_event)
 383 hidden_proto (__nptl_death_event)
 384
 385 /* Register the generation counter in the libpthread with the libc.  */
 386 #ifdef TLS_MULTIPLE_THREADS_IN_TCB
 387 extern void __libc_pthread_init (unsigned long int *ptr,
 388                                  void (*reclaim) (void),
 389                                  const struct pthread_functions *functions)
 390      internal_function;
 391 #else
 392 extern int *__libc_pthread_init (unsigned long int *ptr,
 393                                  void (*reclaim) (void),
 394                                  const struct pthread_functions *functions)
 395      internal_function;
 396
 397 /* Variable set to a nonzero value either if more than one thread runs or ran,
 398    or if a single-threaded process is trying to cancel itself.  See
 399    nptl/descr.h for more context on the single-threaded process case.  */
 400 extern int __pthread_multiple_threads attribute_hidden;
 401 /* Pointer to the corresponding variable in libc.  */
 402 extern int *__libc_multiple_threads_ptr attribute_hidden;
 403 #endif
 404
 405 /* Find a thread given its TID.  */
 406 extern struct pthread *__find_thread_by_id (pid_t tid) attribute_hidden
 407 #ifdef SHARED
 408 ;
 409 #else
 410 weak_function;
 411 #define __find_thread_by_id(tid) \
 412   (__find_thread_by_id ? (__find_thread_by_id) (tid) : (struct pthread *) NULL)
 413 #endif
 414
 415 extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
 416
 417 extern size_t __pthread_get_minstack (const pthread_attr_t *attr);
 418
 419 /* Namespace save aliases.  */
 420 extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
 421                                     struct sched_param *param);
 422 extern int __pthread_setschedparam (pthread_t thread_id, int policy,
 423                                     const struct sched_param *param);
 424 extern int __pthread_setcancelstate (int state, int *oldstate);
 425 extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 426                                  const pthread_mutexattr_t *__mutexattr);
 427 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 428 extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
 429 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
 430 extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
 431      attribute_hidden internal_function;
 432 extern void __pthread_mutex_cond_lock_adjust (pthread_mutex_t *__mutex)
 433      attribute_hidden internal_function;
 434 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 435 extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
 436                                            int __decr)
 437      attribute_hidden internal_function;
 438 extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
 439 extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
 440 extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
 441 extern int __pthread_attr_destroy (pthread_attr_t *attr);
 442 extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
 443                                           int *detachstate);
 444 extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
 445                                           int detachstate);
 446 extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
 447                                            int *inherit);
 448 extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
 449 extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
 450                                          struct sched_param *param);
 451 extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
 452                                          const struct sched_param *param);
 453 extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
 454                                           int *policy);
 455 extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
 456 extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
 457 extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
 458 extern int __pthread_attr_getstackaddr (const pthread_attr_t *__restrict
 459                                         __attr, void **__restrict __stackaddr);
 460 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 461                                         void *__stackaddr);
 462 extern int __pthread_attr_getstacksize (const pthread_attr_t *__restrict
 463                                         __attr,
 464                                         size_t *__restrict __stacksize);
 465 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 466                                         size_t __stacksize);
 467 extern int __pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
 468                                     void **__restrict __stackaddr,
 469                                     size_t *__restrict __stacksize);
 470 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 471                                     size_t __stacksize);
 472 extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
 473                                   const pthread_rwlockattr_t *__restrict
 474                                   __attr);
 475 extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
 476 extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
 477 extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
 478 extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
 479 extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
 480 extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
 481 extern int __pthread_cond_broadcast (pthread_cond_t *cond);
 482 extern int __pthread_cond_destroy (pthread_cond_t *cond);
 483 extern int __pthread_cond_init (pthread_cond_t *cond,
 484                                 const pthread_condattr_t *cond_attr);
 485 extern int __pthread_cond_signal (pthread_cond_t *cond);
 486 extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 487 extern int __pthread_cond_timedwait (pthread_cond_t *cond,
 488                                      pthread_mutex_t *mutex,
 489                                      const struct timespec *abstime);
 490 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 491 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 492 extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
 493 extern void *__pthread_getspecific (pthread_key_t key);
 494 extern int __pthread_setspecific (pthread_key_t key, const void *value);
 495 extern int __pthread_once (pthread_once_t *once_control,
 496                            void (*init_routine) (void));
 497 extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
 498                              void (*child) (void));
 499 extern pthread_t __pthread_self (void);
 500 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
 501 extern int __pthread_kill (pthread_t threadid, int signo);
 502 extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
 503 extern int __pthread_setcanceltype (int type, int *oldtype);
 504 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 505 extern void __pthread_disable_asynccancel (int oldtype)
 506      internal_function attribute_hidden;
 507
 508 #if defined NOT_IN_libc && defined IS_IN_libpthread
 509 hidden_proto (__pthread_mutex_init)
 510 hidden_proto (__pthread_mutex_destroy)
 511 hidden_proto (__pthread_mutex_lock)
 512 hidden_proto (__pthread_mutex_unlock)
 513 hidden_proto (__pthread_rwlock_rdlock)
 514 hidden_proto (__pthread_rwlock_wrlock)
 515 hidden_proto (__pthread_rwlock_unlock)
 516 hidden_proto (__pthread_key_create)
 517 hidden_proto (__pthread_getspecific)
 518 hidden_proto (__pthread_setspecific)
 519 hidden_proto (__pthread_once)
 520 #endif
 521
 522 extern int __pthread_cond_broadcast_2_0 (pthread_cond_2_0_t *cond);
 523 extern int __pthread_cond_destroy_2_0 (pthread_cond_2_0_t *cond);
 524 extern int __pthread_cond_init_2_0 (pthread_cond_2_0_t *cond,
 525                                     const pthread_condattr_t *cond_attr);
 526 extern int __pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond);
 527 extern int __pthread_cond_timedwait_2_0 (pthread_cond_2_0_t *cond,
 528                                          pthread_mutex_t *mutex,
 529                                          const struct timespec *abstime);
 530 extern int __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond,
 531                                     pthread_mutex_t *mutex);
 532
 533 extern int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize,
 534                                      cpu_set_t *cpuset);
 535
 536 /* The two functions are in libc.so and not exported.  */
 537 extern int __libc_enable_asynccancel (void) attribute_hidden;
 538 extern void __libc_disable_asynccancel (int oldtype)
 539      internal_function attribute_hidden;
 540
 541
 542 /* The two functions are in librt.so and not exported.  */
 543 extern int __librt_enable_asynccancel (void) attribute_hidden;
 544 extern void __librt_disable_asynccancel (int oldtype)
 545      internal_function attribute_hidden;
 546
 547 #ifdef IS_IN_libpthread
 548 /* Special versions which use non-exported functions.  */
 549 extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 550                                     void (*routine) (void *), void *arg)
 551      attribute_hidden;
 552 # undef pthread_cleanup_push
 553 # define pthread_cleanup_push(routine,arg) \
 554   { struct _pthread_cleanup_buffer _buffer;                                   \
 555     __pthread_cleanup_push (&_buffer, (routine), (arg));
 556
 557 extern void __pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 558                                    int execute) attribute_hidden;
 559 # undef pthread_cleanup_pop
 560 # define pthread_cleanup_pop(execute) \
 561     __pthread_cleanup_pop (&_buffer, (execute)); }
 562 #endif
 563
 564 extern void __pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 565                                           void (*routine) (void *), void *arg);
 566 extern void __pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 567                                            int execute);
 568
 569 /* Old cleanup interfaces, still used in libc.so.  */
 570 extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 571                                    void (*routine) (void *), void *arg);
 572 extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 573                                   int execute);
 574 extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 575                                          void (*routine) (void *), void *arg);
 576 extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 577                                           int execute);
 578
 579 extern void __nptl_deallocate_tsd (void) attribute_hidden;
 580
 581 extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
 582 #ifndef SHARED
 583 extern void __nptl_set_robust (struct pthread *self);
 584 #endif
 585
 586 extern void __free_stacks (size_t limit) attribute_hidden;
 587
 588 extern void __wait_lookup_done (void) attribute_hidden;
 589
 590 #ifdef SHARED
 591 # define PTHREAD_STATIC_FN_REQUIRE(name)
 592 #else
 593 # define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
 594 #endif
 595
 596 /* Test if the mutex is suitable for the FUTEX_WAIT_REQUEUE_PI operation.  */
 597 #if (defined lll_futex_wait_requeue_pi \
 598      && defined __ASSUME_REQUEUE_PI)
 599 # define USE_REQUEUE_PI(mut) \
 600    ((mut) && (mut) != (void *) ~0l \
 601     && (((mut)->__data.__kind \
 602          & (PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_NORMAL_NP)) \
 603         == PTHREAD_MUTEX_PRIO_INHERIT_NP))
 604 #else
 605 # define USE_REQUEUE_PI(mut) 0
 606 #endif
 607
 608 /* Returns 0 if POL is a valid scheduling policy.  */
 609 static inline int
 610 check_sched_policy_attr (int pol)
 611 {
 612   if (pol == SCHED_OTHER || pol == SCHED_FIFO || pol == SCHED_RR)
 613     return 0;
 614
 615   return EINVAL;
 616 }
 617
 618 /* Returns 0 if PR is within the accepted range of priority values for
 619    the scheduling policy POL or EINVAL otherwise.  */
 620 static inline int
 621 check_sched_priority_attr (int pr, int pol)
 622 {
 623   int min = __sched_get_priority_min (pol);
 624   int max = __sched_get_priority_max (pol);
 625
 626   if (min >= 0 && max >= 0 && pr >= min && pr <= max)
 627     return 0;
 628
 629   return EINVAL;
 630 }
 631
 632 /* Returns 0 if ST is a valid stack size for a thread stack and EINVAL
 633    otherwise.  */
 634 static inline int
 635 check_stacksize_attr (size_t st)
 636 {
 637   if (st >= PTHREAD_STACK_MIN)
 638     return 0;
 639
 640   return EINVAL;
 641 }
 642
 643 /* Defined in pthread_setaffinity.c.  */
 644 extern size_t __kernel_cpumask_size attribute_hidden;
 645 extern int __determine_cpumask_size (pid_t tid);
 646
 647 /* Returns 0 if CS and SZ are valid values for the cpuset and cpuset size
 648    respectively.  Otherwise it returns an error number.  */
 649 static inline int
 650 check_cpuset_attr (const cpu_set_t *cs, const size_t sz)
 651 {
 652   if (__kernel_cpumask_size == 0)
 653     {
 654       int res = __determine_cpumask_size (THREAD_SELF->tid);
 655       if (res)
 656         return res;
 657     }
 658
 659   /* Check whether the new bitmask has any bit set beyond the
 660      last one the kernel accepts.  */
 661   for (size_t cnt = __kernel_cpumask_size; cnt < sz; ++cnt)
 662     if (((char *) cs)[cnt] != '\0')
 663       /* Found a nonzero byte.  This means the user request cannot be
 664          fulfilled.  */
 665       return EINVAL;
 666
 667   return 0;
 668 }
 669
 670 #endif  /* pthreadP.h */