libgcc/gthr-posix.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997-2018 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef GCC_GTHR_POSIX_H
  27 #define GCC_GTHR_POSIX_H
  28
  29 /* POSIX threads specific definitions.
  30    Easy, since the interface is just one-to-one mapping.  */
  31
  32 #define __GTHREADS 1
  33 #define __GTHREADS_CXX0X 1
  34
  35 #include <pthread.h>
  36
  37 #if ((defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)) \
  38      || !defined(_GTHREAD_USE_MUTEX_TIMEDLOCK))
  39 # include <unistd.h>
  40 # if defined(_POSIX_TIMEOUTS) && _POSIX_TIMEOUTS >= 0
  41 #  define _GTHREAD_USE_MUTEX_TIMEDLOCK 1
  42 # else
  43 #  define _GTHREAD_USE_MUTEX_TIMEDLOCK 0
  44 # endif
  45 #endif
  46
  47 typedef pthread_t __gthread_t;
  48 typedef pthread_key_t __gthread_key_t;
  49 typedef pthread_once_t __gthread_once_t;
  50 typedef pthread_mutex_t __gthread_mutex_t;
  51 typedef pthread_mutex_t __gthread_recursive_mutex_t;
  52 typedef pthread_cond_t __gthread_cond_t;
  53 typedef struct timespec __gthread_time_t;
  54
  55 /* POSIX like conditional variables are supported.  Please look at comments
  56    in gthr.h for details. */
  57 #define __GTHREAD_HAS_COND      1
  58
  59 #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
  60 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
  61 #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
  62 #if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
  63 #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER
  64 #elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
  65 #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
  66 #else
  67 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
  68 #endif
  69 #define __GTHREAD_COND_INIT PTHREAD_COND_INITIALIZER
  70 #define __GTHREAD_TIME_INIT {0,0}
  71
  72 #ifdef _GTHREAD_USE_MUTEX_INIT_FUNC
  73 # undef __GTHREAD_MUTEX_INIT
  74 #endif
  75 #ifdef _GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC
  76 # undef __GTHREAD_RECURSIVE_MUTEX_INIT
  77 # undef __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
  78 # define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
  79 #endif
  80 #ifdef _GTHREAD_USE_COND_INIT_FUNC
  81 # undef __GTHREAD_COND_INIT
  82 # define __GTHREAD_COND_INIT_FUNCTION __gthread_cond_init_function
  83 #endif
  84
  85 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
  86 # ifndef __gthrw_pragma
  87 #  define __gthrw_pragma(pragma)
  88 # endif
  89 # define __gthrw2(name,name2,type) \
  90   static __typeof(type) name __attribute__ ((__weakref__(#name2))); \
  91   __gthrw_pragma(weak type)
  92 # define __gthrw_(name) __gthrw_ ## name
  93 #else
  94 # define __gthrw2(name,name2,type)
  95 # define __gthrw_(name) name
  96 #endif
  97
  98 /* Typically, __gthrw_foo is a weak reference to symbol foo.  */
  99 #define __gthrw(name) __gthrw2(__gthrw_ ## name,name,name)
 100
 101 __gthrw(pthread_once)
 102 __gthrw(pthread_getspecific)
 103 __gthrw(pthread_setspecific)
 104
 105 __gthrw(pthread_create)
 106 __gthrw(pthread_join)
 107 __gthrw(pthread_equal)
 108 __gthrw(pthread_self)
 109 __gthrw(pthread_detach)
 110 #ifndef __BIONIC__
 111 __gthrw(pthread_cancel)
 112 #endif
 113 __gthrw(sched_yield)
 114
 115 __gthrw(pthread_mutex_lock)
 116 __gthrw(pthread_mutex_trylock)
 117 #if _GTHREAD_USE_MUTEX_TIMEDLOCK
 118 __gthrw(pthread_mutex_timedlock)
 119 #endif
 120 __gthrw(pthread_mutex_unlock)
 121 __gthrw(pthread_mutex_init)
 122 __gthrw(pthread_mutex_destroy)
 123
 124 __gthrw(pthread_cond_init)
 125 __gthrw(pthread_cond_broadcast)
 126 __gthrw(pthread_cond_signal)
 127 __gthrw(pthread_cond_wait)
 128 __gthrw(pthread_cond_timedwait)
 129 __gthrw(pthread_cond_destroy)
 130
 131 __gthrw(pthread_key_create)
 132 __gthrw(pthread_key_delete)
 133 __gthrw(pthread_mutexattr_init)
 134 __gthrw(pthread_mutexattr_settype)
 135 __gthrw(pthread_mutexattr_destroy)
 136
 137
 138 #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
 139 /* Objective-C.  */
 140 __gthrw(pthread_exit)
 141 #ifdef _POSIX_PRIORITY_SCHEDULING
 142 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
 143 __gthrw(sched_get_priority_max)
 144 __gthrw(sched_get_priority_min)
 145 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
 146 #endif /* _POSIX_PRIORITY_SCHEDULING */
 147 __gthrw(pthread_attr_destroy)
 148 __gthrw(pthread_attr_init)
 149 __gthrw(pthread_attr_setdetachstate)
 150 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
 151 __gthrw(pthread_getschedparam)
 152 __gthrw(pthread_setschedparam)
 153 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
 154 #endif /* _LIBOBJC || _LIBOBJC_WEAK */
 155
 156 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
 157
 158 /* On Solaris 2.6 up to 9, the libc exposes a POSIX threads interface even if
 159    -pthreads is not specified.  The functions are dummies and most return an
 160    error value.  However pthread_once returns 0 without invoking the routine
 161    it is passed so we cannot pretend that the interface is active if -pthreads
 162    is not specified.  On Solaris 2.5.1, the interface is not exposed at all so
 163    we need to play the usual game with weak symbols.  On Solaris 10 and up, a
 164    working interface is always exposed.  On FreeBSD 6 and later, libc also
 165    exposes a dummy POSIX threads interface, similar to what Solaris 2.6 up
 166    to 9 does.  FreeBSD >= 700014 even provides a pthread_cancel stub in libc,
 167    which means the alternate __gthread_active_p below cannot be used there.  */
 168
 169 #if defined(__FreeBSD__) || (defined(__sun) && defined(__svr4__))
 170
 171 static volatile int __gthread_active = -1;
 172
 173 static void
 174 __gthread_trigger (void)
 175 {
 176   __gthread_active = 1;
 177 }
 178
 179 static inline int
 180 __gthread_active_p (void)
 181 {
 182   static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER;
 183   static pthread_once_t __gthread_active_once = PTHREAD_ONCE_INIT;
 184
 185   /* Avoid reading __gthread_active twice on the main code path.  */
 186   int __gthread_active_latest_value = __gthread_active;
 187
 188   /* This test is not protected to avoid taking a lock on the main code
 189      path so every update of __gthread_active in a threaded program must
 190      be atomic with regard to the result of the test.  */
 191   if (__builtin_expect (__gthread_active_latest_value < 0, 0))
 192     {
 193       if (__gthrw_(pthread_once))
 194         {
 195           /* If this really is a threaded program, then we must ensure that
 196              __gthread_active has been set to 1 before exiting this block.  */
 197           __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex);
 198           __gthrw_(pthread_once) (&__gthread_active_once, __gthread_trigger);
 199           __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex);
 200         }
 201
 202       /* Make sure we'll never enter this block again.  */
 203       if (__gthread_active < 0)
 204         __gthread_active = 0;
 205
 206       __gthread_active_latest_value = __gthread_active;
 207     }
 208
 209   return __gthread_active_latest_value != 0;
 210 }
 211
 212 #else /* neither FreeBSD nor Solaris */
 213
 214 /* For a program to be multi-threaded the only thing that it certainly must
 215    be using is pthread_create.  However, there may be other libraries that
 216    intercept pthread_create with their own definitions to wrap pthreads
 217    functionality for some purpose.  In those cases, pthread_create being
 218    defined might not necessarily mean that libpthread is actually linked
 219    in.
 220
 221    For the GNU C library, we can use a known internal name.  This is always
 222    available in the ABI, but no other library would define it.  That is
 223    ideal, since any public pthread function might be intercepted just as
 224    pthread_create might be.  __pthread_key_create is an "internal"
 225    implementation symbol, but it is part of the public exported ABI.  Also,
 226    it's among the symbols that the static libpthread.a always links in
 227    whenever pthread_create is used, so there is no danger of a false
 228    negative result in any statically-linked, multi-threaded program.
 229
 230    For others, we choose pthread_cancel as a function that seems unlikely
 231    to be redefined by an interceptor library.  The bionic (Android) C
 232    library does not provide pthread_cancel, so we do use pthread_create
 233    there (and interceptor libraries lose).  */
 234
 235 #ifdef __GLIBC__
 236 __gthrw2(__gthrw_(__pthread_key_create),
 237          __pthread_key_create,
 238          pthread_key_create)
 239 # define GTHR_ACTIVE_PROXY      __gthrw_(__pthread_key_create)
 240 #elif defined (__BIONIC__)
 241 # define GTHR_ACTIVE_PROXY      __gthrw_(pthread_create)
 242 #else
 243 # define GTHR_ACTIVE_PROXY      __gthrw_(pthread_cancel)
 244 #endif
 245
 246 static inline int
 247 __gthread_active_p (void)
 248 {
 249   static void *const __gthread_active_ptr
 250     = __extension__ (void *) &GTHR_ACTIVE_PROXY;
 251   return __gthread_active_ptr != 0;
 252 }
 253
 254 #endif /* FreeBSD or Solaris */
 255
 256 #else /* not SUPPORTS_WEAK */
 257
 258 /* Similar to Solaris, HP-UX 11 for PA-RISC provides stubs for pthread
 259    calls in shared flavors of the HP-UX C library.  Most of the stubs
 260    have no functionality.  The details are described in the "libc cumulative
 261    patch" for each subversion of HP-UX 11.  There are two special interfaces
 262    provided for checking whether an application is linked to a shared pthread
 263    library or not.  However, these interfaces aren't available in early
 264    libpthread libraries.  We also need a test that works for archive
 265    libraries.  We can't use pthread_once as some libc versions call the
 266    init function.  We also can't use pthread_create or pthread_attr_init
 267    as these create a thread and thereby prevent changing the default stack
 268    size.  The function pthread_default_stacksize_np is available in both
 269    the archive and shared versions of libpthread.   It can be used to
 270    determine the default pthread stack size.  There is a stub in some
 271    shared libc versions which returns a zero size if pthreads are not
 272    active.  We provide an equivalent stub to handle cases where libc
 273    doesn't provide one.  */
 274
 275 #if defined(__hppa__) && defined(__hpux__)
 276
 277 static volatile int __gthread_active = -1;
 278
 279 static inline int
 280 __gthread_active_p (void)
 281 {
 282   /* Avoid reading __gthread_active twice on the main code path.  */
 283   int __gthread_active_latest_value = __gthread_active;
 284   size_t __s;
 285
 286   if (__builtin_expect (__gthread_active_latest_value < 0, 0))
 287     {
 288       pthread_default_stacksize_np (0, &__s);
 289       __gthread_active = __s ? 1 : 0;
 290       __gthread_active_latest_value = __gthread_active;
 291     }
 292
 293   return __gthread_active_latest_value != 0;
 294 }
 295
 296 #else /* not hppa-hpux */
 297
 298 static inline int
 299 __gthread_active_p (void)
 300 {
 301   return 1;
 302 }
 303
 304 #endif /* hppa-hpux */
 305
 306 #endif /* SUPPORTS_WEAK */
 307
 308 #ifdef _LIBOBJC
 309
 310 /* This is the config.h file in libobjc/ */
 311 #include <config.h>
 312
 313 #ifdef HAVE_SCHED_H
 314 # include <sched.h>
 315 #endif
 316
 317 /* Key structure for maintaining thread specific storage */
 318 static pthread_key_t _objc_thread_storage;
 319 static pthread_attr_t _objc_thread_attribs;
 320
 321 /* Thread local storage for a single thread */
 322 static void *thread_local_storage = NULL;
 323
 324 /* Backend initialization functions */
 325
 326 /* Initialize the threads subsystem.  */
 327 static inline int
 328 __gthread_objc_init_thread_system (void)
 329 {
 330   if (__gthread_active_p ())
 331     {
 332       /* Initialize the thread storage key.  */
 333       if (__gthrw_(pthread_key_create) (&_objc_thread_storage, NULL) == 0)
 334         {
 335           /* The normal default detach state for threads is
 336            * PTHREAD_CREATE_JOINABLE which causes threads to not die
 337            * when you think they should.  */
 338           if (__gthrw_(pthread_attr_init) (&_objc_thread_attribs) == 0
 339               && __gthrw_(pthread_attr_setdetachstate) (&_objc_thread_attribs,
 340                                               PTHREAD_CREATE_DETACHED) == 0)
 341             return 0;
 342         }
 343     }
 344
 345   return -1;
 346 }
 347
 348 /* Close the threads subsystem.  */
 349 static inline int
 350 __gthread_objc_close_thread_system (void)
 351 {
 352   if (__gthread_active_p ()
 353       && __gthrw_(pthread_key_delete) (_objc_thread_storage) == 0
 354       && __gthrw_(pthread_attr_destroy) (&_objc_thread_attribs) == 0)
 355     return 0;
 356
 357   return -1;
 358 }
 359
 360 /* Backend thread functions */
 361
 362 /* Create a new thread of execution.  */
 363 static inline objc_thread_t
 364 __gthread_objc_thread_detach (void (*func)(void *), void *arg)
 365 {
 366   objc_thread_t thread_id;
 367   pthread_t new_thread_handle;
 368
 369   if (!__gthread_active_p ())
 370     return NULL;
 371
 372   if (!(__gthrw_(pthread_create) (&new_thread_handle, &_objc_thread_attribs,
 373                                   (void *) func, arg)))
 374     thread_id = (objc_thread_t) new_thread_handle;
 375   else
 376     thread_id = NULL;
 377
 378   return thread_id;
 379 }
 380
 381 /* Set the current thread's priority.  */
 382 static inline int
 383 __gthread_objc_thread_set_priority (int priority)
 384 {
 385   if (!__gthread_active_p ())
 386     return -1;
 387   else
 388     {
 389 #ifdef _POSIX_PRIORITY_SCHEDULING
 390 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
 391       pthread_t thread_id = __gthrw_(pthread_self) ();
 392       int policy;
 393       struct sched_param params;
 394       int priority_min, priority_max;
 395
 396       if (__gthrw_(pthread_getschedparam) (thread_id, &policy, &params) == 0)
 397         {
 398           if ((priority_max = __gthrw_(sched_get_priority_max) (policy)) == -1)
 399             return -1;
 400
 401           if ((priority_min = __gthrw_(sched_get_priority_min) (policy)) == -1)
 402             return -1;
 403
 404           if (priority > priority_max)
 405             priority = priority_max;
 406           else if (priority < priority_min)
 407             priority = priority_min;
 408           params.sched_priority = priority;
 409
 410           /*
 411            * The solaris 7 and several other man pages incorrectly state that
 412            * this should be a pointer to policy but pthread.h is universally
 413            * at odds with this.
 414            */
 415           if (__gthrw_(pthread_setschedparam) (thread_id, policy, &params) == 0)
 416             return 0;
 417         }
 418 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
 419 #endif /* _POSIX_PRIORITY_SCHEDULING */
 420       return -1;
 421     }
 422 }
 423
 424 /* Return the current thread's priority.  */
 425 static inline int
 426 __gthread_objc_thread_get_priority (void)
 427 {
 428 #ifdef _POSIX_PRIORITY_SCHEDULING
 429 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
 430   if (__gthread_active_p ())
 431     {
 432       int policy;
 433       struct sched_param params;
 434
 435       if (__gthrw_(pthread_getschedparam) (__gthrw_(pthread_self) (), &policy, &params) == 0)
 436         return params.sched_priority;
 437       else
 438         return -1;
 439     }
 440   else
 441 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
 442 #endif /* _POSIX_PRIORITY_SCHEDULING */
 443     return OBJC_THREAD_INTERACTIVE_PRIORITY;
 444 }
 445
 446 /* Yield our process time to another thread.  */
 447 static inline void
 448 __gthread_objc_thread_yield (void)
 449 {
 450   if (__gthread_active_p ())
 451     __gthrw_(sched_yield) ();
 452 }
 453
 454 /* Terminate the current thread.  */
 455 static inline int
 456 __gthread_objc_thread_exit (void)
 457 {
 458   if (__gthread_active_p ())
 459     /* exit the thread */
 460     __gthrw_(pthread_exit) (&__objc_thread_exit_status);
 461
 462   /* Failed if we reached here */
 463   return -1;
 464 }
 465
 466 /* Returns an integer value which uniquely describes a thread.  */
 467 static inline objc_thread_t
 468 __gthread_objc_thread_id (void)
 469 {
 470   if (__gthread_active_p ())
 471     return (objc_thread_t) __gthrw_(pthread_self) ();
 472   else
 473     return (objc_thread_t) 1;
 474 }
 475
 476 /* Sets the thread's local storage pointer.  */
 477 static inline int
 478 __gthread_objc_thread_set_data (void *value)
 479 {
 480   if (__gthread_active_p ())
 481     return __gthrw_(pthread_setspecific) (_objc_thread_storage, value);
 482   else
 483     {
 484       thread_local_storage = value;
 485       return 0;
 486     }
 487 }
 488
 489 /* Returns the thread's local storage pointer.  */
 490 static inline void *
 491 __gthread_objc_thread_get_data (void)
 492 {
 493   if (__gthread_active_p ())
 494     return __gthrw_(pthread_getspecific) (_objc_thread_storage);
 495   else
 496     return thread_local_storage;
 497 }
 498
 499 /* Backend mutex functions */
 500
 501 /* Allocate a mutex.  */
 502 static inline int
 503 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
 504 {
 505   if (__gthread_active_p ())
 506     {
 507       mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
 508
 509       if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend, NULL))
 510         {
 511           objc_free (mutex->backend);
 512           mutex->backend = NULL;
 513           return -1;
 514         }
 515     }
 516
 517   return 0;
 518 }
 519
 520 /* Deallocate a mutex.  */
 521 static inline int
 522 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
 523 {
 524   if (__gthread_active_p ())
 525     {
 526       int count;
 527
 528       /*
 529        * Posix Threads specifically require that the thread be unlocked
 530        * for __gthrw_(pthread_mutex_destroy) to work.
 531        */
 532
 533       do
 534         {
 535           count = __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);
 536           if (count < 0)
 537             return -1;
 538         }
 539       while (count);
 540
 541       if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend))
 542         return -1;
 543
 544       objc_free (mutex->backend);
 545       mutex->backend = NULL;
 546     }
 547   return 0;
 548 }
 549
 550 /* Grab a lock on a mutex.  */
 551 static inline int
 552 __gthread_objc_mutex_lock (objc_mutex_t mutex)
 553 {
 554   if (__gthread_active_p ()
 555       && __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend) != 0)
 556     {
 557       return -1;
 558     }
 559
 560   return 0;
 561 }
 562
 563 /* Try to grab a lock on a mutex.  */
 564 static inline int
 565 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
 566 {
 567   if (__gthread_active_p ()
 568       && __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 0)
 569     {
 570       return -1;
 571     }
 572
 573   return 0;
 574 }
 575
 576 /* Unlock the mutex */
 577 static inline int
 578 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
 579 {
 580   if (__gthread_active_p ()
 581       && __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend) != 0)
 582     {
 583       return -1;
 584     }
 585
 586   return 0;
 587 }
 588
 589 /* Backend condition mutex functions */
 590
 591 /* Allocate a condition.  */
 592 static inline int
 593 __gthread_objc_condition_allocate (objc_condition_t condition)
 594 {
 595   if (__gthread_active_p ())
 596     {
 597       condition->backend = objc_malloc (sizeof (pthread_cond_t));
 598
 599       if (__gthrw_(pthread_cond_init) ((pthread_cond_t *) condition->backend, NULL))
 600         {
 601           objc_free (condition->backend);
 602           condition->backend = NULL;
 603           return -1;
 604         }
 605     }
 606
 607   return 0;
 608 }
 609
 610 /* Deallocate a condition.  */
 611 static inline int
 612 __gthread_objc_condition_deallocate (objc_condition_t condition)
 613 {
 614   if (__gthread_active_p ())
 615     {
 616       if (__gthrw_(pthread_cond_destroy) ((pthread_cond_t *) condition->backend))
 617         return -1;
 618
 619       objc_free (condition->backend);
 620       condition->backend = NULL;
 621     }
 622   return 0;
 623 }
 624
 625 /* Wait on the condition */
 626 static inline int
 627 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
 628 {
 629   if (__gthread_active_p ())
 630     return __gthrw_(pthread_cond_wait) ((pthread_cond_t *) condition->backend,
 631                               (pthread_mutex_t *) mutex->backend);
 632   else
 633     return 0;
 634 }
 635
 636 /* Wake up all threads waiting on this condition.  */
 637 static inline int
 638 __gthread_objc_condition_broadcast (objc_condition_t condition)
 639 {
 640   if (__gthread_active_p ())
 641     return __gthrw_(pthread_cond_broadcast) ((pthread_cond_t *) condition->backend);
 642   else
 643     return 0;
 644 }
 645
 646 /* Wake up one thread waiting on this condition.  */
 647 static inline int
 648 __gthread_objc_condition_signal (objc_condition_t condition)
 649 {
 650   if (__gthread_active_p ())
 651     return __gthrw_(pthread_cond_signal) ((pthread_cond_t *) condition->backend);
 652   else
 653     return 0;
 654 }
 655
 656 #else /* _LIBOBJC */
 657
 658 static inline int
 659 __gthread_create (__gthread_t *__threadid, void *(*__func) (void*),
 660                   void *__args)
 661 {
 662   return __gthrw_(pthread_create) (__threadid, NULL, __func, __args);
 663 }
 664
 665 static inline int
 666 __gthread_join (__gthread_t __threadid, void **__value_ptr)
 667 {
 668   return __gthrw_(pthread_join) (__threadid, __value_ptr);
 669 }
 670
 671 static inline int
 672 __gthread_detach (__gthread_t __threadid)
 673 {
 674   return __gthrw_(pthread_detach) (__threadid);
 675 }
 676
 677 static inline int
 678 __gthread_equal (__gthread_t __t1, __gthread_t __t2)
 679 {
 680   return __gthrw_(pthread_equal) (__t1, __t2);
 681 }
 682
 683 static inline __gthread_t
 684 __gthread_self (void)
 685 {
 686   return __gthrw_(pthread_self) ();
 687 }
 688
 689 static inline int
 690 __gthread_yield (void)
 691 {
 692   return __gthrw_(sched_yield) ();
 693 }
 694
 695 static inline int
 696 __gthread_once (__gthread_once_t *__once, void (*__func) (void))
 697 {
 698   if (__gthread_active_p ())
 699     return __gthrw_(pthread_once) (__once, __func);
 700   else
 701     return -1;
 702 }
 703
 704 static inline int
 705 __gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
 706 {
 707   return __gthrw_(pthread_key_create) (__key, __dtor);
 708 }
 709
 710 static inline int
 711 __gthread_key_delete (__gthread_key_t __key)
 712 {
 713   return __gthrw_(pthread_key_delete) (__key);
 714 }
 715
 716 static inline void *
 717 __gthread_getspecific (__gthread_key_t __key)
 718 {
 719   return __gthrw_(pthread_getspecific) (__key);
 720 }
 721
 722 static inline int
 723 __gthread_setspecific (__gthread_key_t __key, const void *__ptr)
 724 {
 725   return __gthrw_(pthread_setspecific) (__key, __ptr);
 726 }
 727
 728 static inline void
 729 __gthread_mutex_init_function (__gthread_mutex_t *__mutex)
 730 {
 731   if (__gthread_active_p ())
 732     __gthrw_(pthread_mutex_init) (__mutex, NULL);
 733 }
 734
 735 static inline int
 736 __gthread_mutex_destroy (__gthread_mutex_t *__mutex)
 737 {
 738   if (__gthread_active_p ())
 739     return __gthrw_(pthread_mutex_destroy) (__mutex);
 740   else
 741     return 0;
 742 }
 743
 744 static inline int
 745 __gthread_mutex_lock (__gthread_mutex_t *__mutex)
 746 {
 747   if (__gthread_active_p ())
 748     return __gthrw_(pthread_mutex_lock) (__mutex);
 749   else
 750     return 0;
 751 }
 752
 753 static inline int
 754 __gthread_mutex_trylock (__gthread_mutex_t *__mutex)
 755 {
 756   if (__gthread_active_p ())
 757     return __gthrw_(pthread_mutex_trylock) (__mutex);
 758   else
 759     return 0;
 760 }
 761
 762 #if _GTHREAD_USE_MUTEX_TIMEDLOCK
 763 static inline int
 764 __gthread_mutex_timedlock (__gthread_mutex_t *__mutex,
 765                            const __gthread_time_t *__abs_timeout)
 766 {
 767   if (__gthread_active_p ())
 768     return __gthrw_(pthread_mutex_timedlock) (__mutex, __abs_timeout);
 769   else
 770     return 0;
 771 }
 772 #endif
 773
 774 static inline int
 775 __gthread_mutex_unlock (__gthread_mutex_t *__mutex)
 776 {
 777   if (__gthread_active_p ())
 778     return __gthrw_(pthread_mutex_unlock) (__mutex);
 779   else
 780     return 0;
 781 }
 782
 783 #if !defined( PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP) \
 784   || defined(_GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC)
 785 static inline int
 786 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
 787 {
 788   if (__gthread_active_p ())
 789     {
 790       pthread_mutexattr_t __attr;
 791       int __r;
 792
 793       __r = __gthrw_(pthread_mutexattr_init) (&__attr);
 794       if (!__r)
 795         __r = __gthrw_(pthread_mutexattr_settype) (&__attr,
 796                                                    PTHREAD_MUTEX_RECURSIVE);
 797       if (!__r)
 798         __r = __gthrw_(pthread_mutex_init) (__mutex, &__attr);
 799       if (!__r)
 800         __r = __gthrw_(pthread_mutexattr_destroy) (&__attr);
 801       return __r;
 802     }
 803   return 0;
 804 }
 805 #endif
 806
 807 static inline int
 808 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
 809 {
 810   return __gthread_mutex_lock (__mutex);
 811 }
 812
 813 static inline int
 814 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
 815 {
 816   return __gthread_mutex_trylock (__mutex);
 817 }
 818
 819 #if _GTHREAD_USE_MUTEX_TIMEDLOCK
 820 static inline int
 821 __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *__mutex,
 822                                      const __gthread_time_t *__abs_timeout)
 823 {
 824   return __gthread_mutex_timedlock (__mutex, __abs_timeout);
 825 }
 826 #endif
 827
 828 static inline int
 829 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
 830 {
 831   return __gthread_mutex_unlock (__mutex);
 832 }
 833
 834 static inline int
 835 __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
 836 {
 837   return __gthread_mutex_destroy (__mutex);
 838 }
 839
 840 #ifdef _GTHREAD_USE_COND_INIT_FUNC
 841 static inline void
 842 __gthread_cond_init_function (__gthread_cond_t *__cond)
 843 {
 844   if (__gthread_active_p ())
 845     __gthrw_(pthread_cond_init) (__cond, NULL);
 846 }
 847 #endif
 848
 849 static inline int
 850 __gthread_cond_broadcast (__gthread_cond_t *__cond)
 851 {
 852   return __gthrw_(pthread_cond_broadcast) (__cond);
 853 }
 854
 855 static inline int
 856 __gthread_cond_signal (__gthread_cond_t *__cond)
 857 {
 858   return __gthrw_(pthread_cond_signal) (__cond);
 859 }
 860
 861 static inline int
 862 __gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex)
 863 {
 864   return __gthrw_(pthread_cond_wait) (__cond, __mutex);
 865 }
 866
 867 static inline int
 868 __gthread_cond_timedwait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex,
 869                           const __gthread_time_t *__abs_timeout)
 870 {
 871   return __gthrw_(pthread_cond_timedwait) (__cond, __mutex, __abs_timeout);
 872 }
 873
 874 static inline int
 875 __gthread_cond_wait_recursive (__gthread_cond_t *__cond,
 876                                __gthread_recursive_mutex_t *__mutex)
 877 {
 878   return __gthread_cond_wait (__cond, __mutex);
 879 }
 880
 881 static inline int
 882 __gthread_cond_destroy (__gthread_cond_t* __cond)
 883 {
 884   return __gthrw_(pthread_cond_destroy) (__cond);
 885 }
 886
 887 #endif /* _LIBOBJC */
 888
 889 #endif /* ! GCC_GTHR_POSIX_H */