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 /* Signal used to implement the setuid et.al. functions.  */
 210 #define SIGSETXID       (__SIGRTMIN + 1)
 211
 212 /* Used to communicate with signal handler.  */
 213 extern struct xid_command *__xidcmd attribute_hidden;
 214
 215
 216 /* Internal prototypes.  */
 217
 218 /* Thread list handling.  */
 219 extern struct pthread *__find_in_stack_list (struct pthread *pd)
 220      attribute_hidden internal_function;
 221
 222 /* Deallocate a thread's stack after optionally making sure the thread
 223    descriptor is still valid.  */
 224 extern void __free_tcb (struct pthread *pd) attribute_hidden internal_function;
 225
 226 /* Free allocated stack.  */
 227 extern void __deallocate_stack (struct pthread *pd)
 228      attribute_hidden internal_function;
 229
 230 /* Mark all the stacks except for the current one as available.  This
 231    function also re-initializes the lock for the stack cache.  */
 232 extern void __reclaim_stacks (void) attribute_hidden;
 233
 234 /* Make all threads's stacks executable.  */
 235 extern int __make_stacks_executable (void **stack_endp)
 236      internal_function attribute_hidden;
 237
 238 /* longjmp handling.  */
 239 extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
 240 #if defined NOT_IN_libc && defined IS_IN_libpthread
 241 hidden_proto (__pthread_cleanup_upto)
 242 #endif
 243
 244
 245 /* Functions with versioned interfaces.  */
 246 extern int __pthread_create_2_1 (pthread_t *newthread,
 247                                  const pthread_attr_t *attr,
 248                                  void *(*start_routine) (void *), void *arg);
 249 extern int __pthread_create_2_0 (pthread_t *newthread,
 250                                  const pthread_attr_t *attr,
 251                                  void *(*start_routine) (void *), void *arg);
 252 extern int __pthread_attr_init_2_1 (pthread_attr_t *attr);
 253 extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
 254
 255
 256 /* Event handlers for libthread_db interface.  */
 257 extern void __nptl_create_event (void);
 258 extern void __nptl_death_event (void);
 259 hidden_proto (__nptl_create_event)
 260 hidden_proto (__nptl_death_event)
 261
 262 /* Register the generation counter in the libpthread with the libc.  */
 263 #ifdef TLS_MULTIPLE_THREADS_IN_TCB
 264 extern void __libc_pthread_init (unsigned long int *ptr,
 265                                  void (*reclaim) (void),
 266                                  const struct pthread_functions *functions)
 267      internal_function;
 268 #else
 269 extern int *__libc_pthread_init (unsigned long int *ptr,
 270                                  void (*reclaim) (void),
 271                                  const struct pthread_functions *functions)
 272      internal_function;
 273
 274 /* Variable set to a nonzero value if more than one thread runs or ran.  */
 275 extern int __pthread_multiple_threads attribute_hidden;
 276 /* Pointer to the corresponding variable in libc.  */
 277 extern int *__libc_multiple_threads_ptr attribute_hidden;
 278 #endif
 279
 280 /* Find a thread given its TID.  */
 281 extern struct pthread *__find_thread_by_id (pid_t tid) attribute_hidden
 282 #ifdef SHARED
 283 ;
 284 #else
 285 weak_function;
 286 #define __find_thread_by_id(tid) \
 287   (__find_thread_by_id ? (__find_thread_by_id) (tid) : (struct pthread *) NULL)
 288 #endif
 289
 290 extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
 291
 292
 293 /* Namespace save aliases.  */
 294 extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
 295                                     struct sched_param *param);
 296 extern int __pthread_setschedparam (pthread_t thread_id, int policy,
 297                                     const struct sched_param *param);
 298 extern int __pthread_setcancelstate (int state, int *oldstate);
 299 extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 300                                  __const pthread_mutexattr_t *__mutexattr);
 301 extern int __pthread_mutex_init_internal (pthread_mutex_t *__mutex,
 302                                           __const pthread_mutexattr_t *__mutexattr)
 303      attribute_hidden;
 304 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 305 extern int __pthread_mutex_destroy_internal (pthread_mutex_t *__mutex)
 306      attribute_hidden;
 307 extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
 308 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
 309 extern int __pthread_mutex_lock_internal (pthread_mutex_t *__mutex)
 310      attribute_hidden;
 311 extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
 312      attribute_hidden internal_function;
 313 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 314 extern int __pthread_mutex_unlock_internal (pthread_mutex_t *__mutex)
 315      attribute_hidden;
 316 extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
 317                                            int __decr)
 318      attribute_hidden internal_function;
 319 extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
 320 extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
 321 extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
 322 extern int __pthread_attr_destroy (pthread_attr_t *attr);
 323 extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
 324                                           int *detachstate);
 325 extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
 326                                           int detachstate);
 327 extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
 328                                            int *inherit);
 329 extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
 330 extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
 331                                          struct sched_param *param);
 332 extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
 333                                          const struct sched_param *param);
 334 extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
 335                                           int *policy);
 336 extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
 337 extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
 338 extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
 339 extern int __pthread_attr_getstackaddr (__const pthread_attr_t *__restrict
 340                                         __attr, void **__restrict __stackaddr);
 341 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 342                                         void *__stackaddr);
 343 extern int __pthread_attr_getstacksize (__const pthread_attr_t *__restrict
 344                                         __attr,
 345                                         size_t *__restrict __stacksize);
 346 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 347                                         size_t __stacksize);
 348 extern int __pthread_attr_getstack (__const pthread_attr_t *__restrict __attr,
 349                                     void **__restrict __stackaddr,
 350                                     size_t *__restrict __stacksize);
 351 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 352                                     size_t __stacksize);
 353 extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
 354                                   __const pthread_rwlockattr_t *__restrict
 355                                   __attr);
 356 extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
 357 extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
 358 extern int __pthread_rwlock_rdlock_internal (pthread_rwlock_t *__rwlock);
 359 extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
 360 extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
 361 extern int __pthread_rwlock_wrlock_internal (pthread_rwlock_t *__rwlock);
 362 extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
 363 extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
 364 extern int __pthread_rwlock_unlock_internal (pthread_rwlock_t *__rwlock);
 365 extern int __pthread_cond_broadcast (pthread_cond_t *cond);
 366 extern int __pthread_cond_destroy (pthread_cond_t *cond);
 367 extern int __pthread_cond_init (pthread_cond_t *cond,
 368                                 const pthread_condattr_t *cond_attr);
 369 extern int __pthread_cond_signal (pthread_cond_t *cond);
 370 extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 371 extern int __pthread_cond_timedwait (pthread_cond_t *cond,
 372                                      pthread_mutex_t *mutex,
 373                                      const struct timespec *abstime);
 374 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 375 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 376 extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
 377 extern int __pthread_key_create_internal (pthread_key_t *key,
 378                                           void (*destr) (void *));
 379 extern void *__pthread_getspecific (pthread_key_t key);
 380 extern void *__pthread_getspecific_internal (pthread_key_t key);
 381 extern int __pthread_setspecific (pthread_key_t key, const void *value);
 382 extern int __pthread_setspecific_internal (pthread_key_t key,
 383                                            const void *value);
 384 extern int __pthread_once (pthread_once_t *once_control,
 385                            void (*init_routine) (void));
 386 extern int __pthread_once_internal (pthread_once_t *once_control,
 387                                     void (*init_routine) (void));
 388 extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
 389                              void (*child) (void));
 390 extern pthread_t __pthread_self (void);
 391 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
 392 extern int __pthread_kill (pthread_t threadid, int signo);
 393 extern void __pthread_exit (void *value);
 394 extern int __pthread_setcanceltype (int type, int *oldtype);
 395 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 396 extern void __pthread_disable_asynccancel (int oldtype)
 397      internal_function attribute_hidden;
 398
 399 extern int __pthread_cond_broadcast_2_0 (pthread_cond_2_0_t *cond);
 400 extern int __pthread_cond_destroy_2_0 (pthread_cond_2_0_t *cond);
 401 extern int __pthread_cond_init_2_0 (pthread_cond_2_0_t *cond,
 402                                     const pthread_condattr_t *cond_attr);
 403 extern int __pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond);
 404 extern int __pthread_cond_timedwait_2_0 (pthread_cond_2_0_t *cond,
 405                                          pthread_mutex_t *mutex,
 406                                          const struct timespec *abstime);
 407 extern int __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond,
 408                                     pthread_mutex_t *mutex);
 409
 410 extern int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize,
 411                                      cpu_set_t *cpuset);
 412
 413 /* The two functions are in libc.so and not exported.  */
 414 extern int __libc_enable_asynccancel (void) attribute_hidden;
 415 extern void __libc_disable_asynccancel (int oldtype)
 416      internal_function attribute_hidden;
 417
 418
 419 /* The two functions are in librt.so and not exported.  */
 420 extern int __librt_enable_asynccancel (void) attribute_hidden;
 421 extern void __librt_disable_asynccancel (int oldtype)
 422      internal_function attribute_hidden;
 423
 424 #ifdef IS_IN_libpthread
 425 /* Special versions which use non-exported functions.  */
 426 extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 427                                     void (*routine) (void *), void *arg)
 428      attribute_hidden;
 429 # undef pthread_cleanup_push
 430 # define pthread_cleanup_push(routine,arg) \
 431   { struct _pthread_cleanup_buffer _buffer;                                   \
 432     __pthread_cleanup_push (&_buffer, (routine), (arg));
 433
 434 extern void __pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 435                                    int execute) attribute_hidden;
 436 # undef pthread_cleanup_pop
 437 # define pthread_cleanup_pop(execute) \
 438     __pthread_cleanup_pop (&_buffer, (execute)); }
 439 #endif
 440
 441 extern void __pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 442                                           void (*routine) (void *), void *arg);
 443 extern void __pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 444                                            int execute);
 445
 446 /* Old cleanup interfaces, still used in libc.so.  */
 447 extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
 448                                    void (*routine) (void *), void *arg);
 449 extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
 450                                   int execute);
 451 extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
 452                                          void (*routine) (void *), void *arg);
 453 extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
 454                                           int execute);
 455
 456 extern void __nptl_deallocate_tsd (void) attribute_hidden;
 457
 458 extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
 459
 460 #ifdef SHARED
 461 # define PTHREAD_STATIC_FN_REQUIRE(name)
 462 #else
 463 # define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
 464 #endif
 465
 466 #endif  /* pthreadP.h */