nptl/pthreadP.h

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