gcc/gthr-posix95.h

   1 /* Threads compatibility routines for libgcc2 and libobjc.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 2004, 2005, 2007 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 2, 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 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #ifndef GCC_GTHR_POSIX_H
  30 #define GCC_GTHR_POSIX_H
  31
  32 /* POSIX threads specific definitions.
  33    Easy, since the interface is just one-to-one mapping.  */
  34
  35 #define __GTHREADS 1
  36
  37 /* Some implementations of <pthread.h> require this to be defined.  */
  38 #ifndef _REENTRANT
  39 #define _REENTRANT 1
  40 #endif
  41
  42 #include <pthread.h>
  43 #include <unistd.h>
  44
  45 typedef pthread_key_t __gthread_key_t;
  46 typedef pthread_once_t __gthread_once_t;
  47 typedef pthread_mutex_t __gthread_mutex_t;
  48 typedef pthread_cond_t __gthread_cond_t;
  49
  50 /* POSIX like conditional variables are supported.  Please look at comments
  51    in gthr.h for details. */
  52 #define __GTHREAD_HAS_COND      1
  53
  54 typedef struct {
  55   long depth;
  56   pthread_t owner;
  57   pthread_mutex_t actual;
  58 } __gthread_recursive_mutex_t;
  59
  60 #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
  61 #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
  62 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
  63 #define __GTHREAD_COND_INIT PTHREAD_COND_INITIALIZER
  64
  65 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
  66 # define __gthrw(name) \
  67   static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
  68 # define __gthrw_(name) __gthrw_ ## name
  69 #else
  70 # define __gthrw(name)
  71 # define __gthrw_(name) name
  72 #endif
  73
  74 __gthrw(pthread_once)
  75 __gthrw(pthread_key_create)
  76 __gthrw(pthread_key_delete)
  77 __gthrw(pthread_getspecific)
  78 __gthrw(pthread_setspecific)
  79 __gthrw(pthread_create)
  80 __gthrw(pthread_cancel)
  81 __gthrw(pthread_self)
  82
  83 __gthrw(pthread_mutex_lock)
  84 __gthrw(pthread_mutex_trylock)
  85 __gthrw(pthread_mutex_unlock)
  86 __gthrw(pthread_mutexattr_init)
  87 __gthrw(pthread_mutexattr_destroy)
  88
  89 __gthrw(pthread_mutex_init)
  90 __gthrw(pthread_cond_broadcast)
  91 __gthrw(pthread_cond_wait)
  92
  93 #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
  94 /* Objective-C.  */
  95 __gthrw(pthread_cond_destroy)
  96 __gthrw(pthread_cond_init)
  97 __gthrw(pthread_cond_signal)
  98 __gthrw(pthread_exit)
  99 __gthrw(pthread_mutex_destroy)
 100 #ifdef _POSIX_PRIORITY_SCHEDULING
 101 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
 102 __gthrw(sched_get_priority_max)
 103 __gthrw(sched_get_priority_min)
 104 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
 105 #endif /* _POSIX_PRIORITY_SCHEDULING */
 106 __gthrw(sched_yield)
 107 __gthrw(pthread_attr_destroy)
 108 __gthrw(pthread_attr_init)
 109 __gthrw(pthread_attr_setdetachstate)
 110 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
 111 __gthrw(pthread_getschedparam)
 112 __gthrw(pthread_setschedparam)
 113 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
 114 #endif /* _LIBOBJC || _LIBOBJC_WEAK */
 115
 116 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
 117
 118 /* On Solaris 2.6 up to 9, the libc exposes a POSIX threads interface even if
 119    -pthreads is not specified.  The functions are dummies and most return an
 120    error value.  However pthread_once returns 0 without invoking the routine
 121    it is passed so we cannot pretend that the interface is active if -pthreads
 122    is not specified.  On Solaris 2.5.1, the interface is not exposed at all so
 123    we need to play the usual game with weak symbols.  On Solaris 10 and up, a
 124    working interface is always exposed.  */
 125
 126 #if defined(__sun) && defined(__svr4__)
 127
 128 static volatile int __gthread_active = -1;
 129
 130 static void
 131 __gthread_trigger (void)
 132 {
 133   __gthread_active = 1;
 134 }
 135
 136 static inline int
 137 __gthread_active_p (void)
 138 {
 139   static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER;
 140   static pthread_once_t __gthread_active_once = PTHREAD_ONCE_INIT;
 141
 142   /* Avoid reading __gthread_active twice on the main code path.  */
 143   int __gthread_active_latest_value = __gthread_active;
 144
 145   /* This test is not protected to avoid taking a lock on the main code
 146      path so every update of __gthread_active in a threaded program must
 147      be atomic with regard to the result of the test.  */
 148   if (__builtin_expect (__gthread_active_latest_value < 0, 0))
 149     {
 150       if (__gthrw_(pthread_once))
 151         {
 152           /* If this really is a threaded program, then we must ensure that
 153              __gthread_active has been set to 1 before exiting this block.  */
 154           __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex);
 155           __gthrw_(pthread_once) (&__gthread_active_once, __gthread_trigger);
 156           __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex);
 157         }
 158
 159       /* Make sure we'll never enter this block again.  */
 160       if (__gthread_active < 0)
 161         __gthread_active = 0;
 162
 163       __gthread_active_latest_value = __gthread_active;
 164     }
 165
 166   return __gthread_active_latest_value != 0;
 167 }
 168
 169 #else /* not Solaris */
 170
 171 static inline int
 172 __gthread_active_p (void)
 173 {
 174   static void *const __gthread_active_ptr
 175     = __extension__ (void *) &__gthrw_(pthread_cancel);
 176   return __gthread_active_ptr != 0;
 177 }
 178
 179 #endif /* Solaris */
 180
 181 #else /* not SUPPORTS_WEAK */
 182
 183 /* Similar to Solaris, HP-UX 11 for PA-RISC provides stubs for pthread
 184    calls in shared flavors of the HP-UX C library.  Most of the stubs
 185    have no functionality.  The details are described in the "libc cumulative
 186    patch" for each subversion of HP-UX 11.  There are two special interfaces
 187    provided for checking whether an application is linked to a pthread
 188    library or not.  However, these interfaces aren't available in early
 189    libc versions.  We also can't use pthread_once as some libc versions
 190    call the init function.  So, we use pthread_create to check whether it
 191    is possible to create a thread or not.  The stub implementation returns
 192    the error number ENOSYS.  */
 193
 194 #if defined(__hppa__) && defined(__hpux__)
 195
 196 #include <errno.h>
 197
 198 static volatile int __gthread_active = -1;
 199
 200 static void *
 201 __gthread_start (void *arg __attribute__((unused)))
 202 {
 203   return NULL;
 204 }
 205
 206 static void __gthread_active_init (void) __attribute__((noinline));
 207 static void
 208 __gthread_active_init (void)
 209 {
 210   static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER;
 211   pthread_t t;
 212   pthread_attr_t a;
 213   int result;
 214
 215   __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex);
 216   if (__gthread_active < 0)
 217     {
 218       __gthrw_(pthread_attr_init) (&a);
 219       __gthrw_(pthread_attr_setdetachstate) (&a, PTHREAD_CREATE_DETACHED);
 220       result = __gthrw_(pthread_create) (&t, &a, __gthread_start, NULL);
 221       if (result != ENOSYS)
 222         __gthread_active = 1;
 223       else
 224         __gthread_active = 0;
 225       __gthrw_(pthread_attr_destroy) (&a);
 226     }
 227   __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex);
 228 }
 229
 230 static inline int
 231 __gthread_active_p (void)
 232 {
 233   /* Avoid reading __gthread_active twice on the main code path.  */
 234   int __gthread_active_latest_value = __gthread_active;
 235
 236   /* This test is not protected to avoid taking a lock on the main code
 237      path so every update of __gthread_active in a threaded program must
 238      be atomic with regard to the result of the test.  */
 239   if (__builtin_expect (__gthread_active_latest_value < 0, 0))
 240     {
 241       __gthread_active_init ();
 242       __gthread_active_latest_value = __gthread_active;
 243     }
 244
 245   return __gthread_active_latest_value != 0;
 246 }
 247
 248 #else /* not hppa-hpux */
 249
 250 static inline int
 251 __gthread_active_p (void)
 252 {
 253   return 1;
 254 }
 255
 256 #endif /* hppa-hpux */
 257
 258 #endif /* SUPPORTS_WEAK */
 259
 260 #ifdef _LIBOBJC
 261
 262 /* This is the config.h file in libobjc/ */
 263 #include <config.h>
 264
 265 #ifdef HAVE_SCHED_H
 266 # include <sched.h>
 267 #endif
 268
 269 /* Key structure for maintaining thread specific storage */
 270 static pthread_key_t _objc_thread_storage;
 271 static pthread_attr_t _objc_thread_attribs;
 272
 273 /* Thread local storage for a single thread */
 274 static void *thread_local_storage = NULL;
 275
 276 /* Backend initialization functions */
 277
 278 /* Initialize the threads subsystem.  */
 279 static inline int
 280 __gthread_objc_init_thread_system (void)
 281 {
 282   if (__gthread_active_p ())
 283     {
 284       /* Initialize the thread storage key.  */
 285       if (__gthrw_(pthread_key_create) (&_objc_thread_storage, NULL) == 0)
 286         {
 287           /* The normal default detach state for threads is
 288            * PTHREAD_CREATE_JOINABLE which causes threads to not die
 289            * when you think they should.  */
 290           if (__gthrw_(pthread_attr_init) (&_objc_thread_attribs) == 0
 291               && __gthrw_(pthread_attr_setdetachstate) (&_objc_thread_attribs,
 292                                               PTHREAD_CREATE_DETACHED) == 0)
 293             return 0;
 294         }
 295     }
 296
 297   return -1;
 298 }
 299
 300 /* Close the threads subsystem.  */
 301 static inline int
 302 __gthread_objc_close_thread_system (void)
 303 {
 304   if (__gthread_active_p ()
 305       && __gthrw_(pthread_key_delete) (_objc_thread_storage) == 0
 306       && __gthrw_(pthread_attr_destroy) (&_objc_thread_attribs) == 0)
 307     return 0;
 308
 309   return -1;
 310 }
 311
 312 /* Backend thread functions */
 313
 314 /* Create a new thread of execution.  */
 315 static inline objc_thread_t
 316 __gthread_objc_thread_detach (void (*func)(void *), void *arg)
 317 {
 318   objc_thread_t thread_id;
 319   pthread_t new_thread_handle;
 320
 321   if (!__gthread_active_p ())
 322     return NULL;
 323
 324   if (!(__gthrw_(pthread_create) (&new_thread_handle, NULL, (void *) func, arg)))
 325     thread_id = (objc_thread_t) new_thread_handle;
 326   else
 327     thread_id = NULL;
 328
 329   return thread_id;
 330 }
 331
 332 /* Set the current thread's priority.  */
 333 static inline int
 334 __gthread_objc_thread_set_priority (int priority)
 335 {
 336   if (!__gthread_active_p ())
 337     return -1;
 338   else
 339     {
 340 #ifdef _POSIX_PRIORITY_SCHEDULING
 341 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
 342       pthread_t thread_id = __gthrw_(pthread_self) ();
 343       int policy;
 344       struct sched_param params;
 345       int priority_min, priority_max;
 346
 347       if (__gthrw_(pthread_getschedparam) (thread_id, &policy, &params) == 0)
 348         {
 349           if ((priority_max = __gthrw_(sched_get_priority_max) (policy)) == -1)
 350             return -1;
 351
 352           if ((priority_min = __gthrw_(sched_get_priority_min) (policy)) == -1)
 353             return -1;
 354
 355           if (priority > priority_max)
 356             priority = priority_max;
 357           else if (priority < priority_min)
 358             priority = priority_min;
 359           params.sched_priority = priority;
 360
 361           /*
 362            * The solaris 7 and several other man pages incorrectly state that
 363            * this should be a pointer to policy but pthread.h is universally
 364            * at odds with this.
 365            */
 366           if (__gthrw_(pthread_setschedparam) (thread_id, policy, &params) == 0)
 367             return 0;
 368         }
 369 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
 370 #endif /* _POSIX_PRIORITY_SCHEDULING */
 371       return -1;
 372     }
 373 }
 374
 375 /* Return the current thread's priority.  */
 376 static inline int
 377 __gthread_objc_thread_get_priority (void)
 378 {
 379 #ifdef _POSIX_PRIORITY_SCHEDULING
 380 #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
 381   if (__gthread_active_p ())
 382     {
 383       int policy;
 384       struct sched_param params;
 385
 386       if (__gthrw_(pthread_getschedparam) (__gthrw_(pthread_self) (), &policy, &params) == 0)
 387         return params.sched_priority;
 388       else
 389         return -1;
 390     }
 391   else
 392 #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
 393 #endif /* _POSIX_PRIORITY_SCHEDULING */
 394     return OBJC_THREAD_INTERACTIVE_PRIORITY;
 395 }
 396
 397 /* Yield our process time to another thread.  */
 398 static inline void
 399 __gthread_objc_thread_yield (void)
 400 {
 401   if (__gthread_active_p ())
 402     __gthrw_(sched_yield) ();
 403 }
 404
 405 /* Terminate the current thread.  */
 406 static inline int
 407 __gthread_objc_thread_exit (void)
 408 {
 409   if (__gthread_active_p ())
 410     /* exit the thread */
 411     __gthrw_(pthread_exit) (&__objc_thread_exit_status);
 412
 413   /* Failed if we reached here */
 414   return -1;
 415 }
 416
 417 /* Returns an integer value which uniquely describes a thread.  */
 418 static inline objc_thread_t
 419 __gthread_objc_thread_id (void)
 420 {
 421   if (__gthread_active_p ())
 422     return (objc_thread_t) __gthrw_(pthread_self) ();
 423   else
 424     return (objc_thread_t) 1;
 425 }
 426
 427 /* Sets the thread's local storage pointer.  */
 428 static inline int
 429 __gthread_objc_thread_set_data (void *value)
 430 {
 431   if (__gthread_active_p ())
 432     return __gthrw_(pthread_setspecific) (_objc_thread_storage, value);
 433   else
 434     {
 435       thread_local_storage = value;
 436       return 0;
 437     }
 438 }
 439
 440 /* Returns the thread's local storage pointer.  */
 441 static inline void *
 442 __gthread_objc_thread_get_data (void)
 443 {
 444   if (__gthread_active_p ())
 445     return __gthrw_(pthread_getspecific) (_objc_thread_storage);
 446   else
 447     return thread_local_storage;
 448 }
 449
 450 /* Backend mutex functions */
 451
 452 /* Allocate a mutex.  */
 453 static inline int
 454 __gthread_objc_mutex_allocate (objc_mutex_t mutex)
 455 {
 456   if (__gthread_active_p ())
 457     {
 458       mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
 459
 460       if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend, NULL))
 461         {
 462           objc_free (mutex->backend);
 463           mutex->backend = NULL;
 464           return -1;
 465         }
 466     }
 467
 468   return 0;
 469 }
 470
 471 /* Deallocate a mutex.  */
 472 static inline int
 473 __gthread_objc_mutex_deallocate (objc_mutex_t mutex)
 474 {
 475   if (__gthread_active_p ())
 476     {
 477       int count;
 478
 479       /*
 480        * Posix Threads specifically require that the thread be unlocked
 481        * for __gthrw_(pthread_mutex_destroy) to work.
 482        */
 483
 484       do
 485         {
 486           count = __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);
 487           if (count < 0)
 488             return -1;
 489         }
 490       while (count);
 491
 492       if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend))
 493         return -1;
 494
 495       objc_free (mutex->backend);
 496       mutex->backend = NULL;
 497     }
 498   return 0;
 499 }
 500
 501 /* Grab a lock on a mutex.  */
 502 static inline int
 503 __gthread_objc_mutex_lock (objc_mutex_t mutex)
 504 {
 505   if (__gthread_active_p ()
 506       && __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend) != 0)
 507     {
 508       return -1;
 509     }
 510
 511   return 0;
 512 }
 513
 514 /* Try to grab a lock on a mutex.  */
 515 static inline int
 516 __gthread_objc_mutex_trylock (objc_mutex_t mutex)
 517 {
 518   if (__gthread_active_p ()
 519       && __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 0)
 520     {
 521       return -1;
 522     }
 523
 524   return 0;
 525 }
 526
 527 /* Unlock the mutex */
 528 static inline int
 529 __gthread_objc_mutex_unlock (objc_mutex_t mutex)
 530 {
 531   if (__gthread_active_p ()
 532       && __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend) != 0)
 533     {
 534       return -1;
 535     }
 536
 537   return 0;
 538 }
 539
 540 /* Backend condition mutex functions */
 541
 542 /* Allocate a condition.  */
 543 static inline int
 544 __gthread_objc_condition_allocate (objc_condition_t condition)
 545 {
 546   if (__gthread_active_p ())
 547     {
 548       condition->backend = objc_malloc (sizeof (pthread_cond_t));
 549
 550       if (__gthrw_(pthread_cond_init) ((pthread_cond_t *) condition->backend, NULL))
 551         {
 552           objc_free (condition->backend);
 553           condition->backend = NULL;
 554           return -1;
 555         }
 556     }
 557
 558   return 0;
 559 }
 560
 561 /* Deallocate a condition.  */
 562 static inline int
 563 __gthread_objc_condition_deallocate (objc_condition_t condition)
 564 {
 565   if (__gthread_active_p ())
 566     {
 567       if (__gthrw_(pthread_cond_destroy) ((pthread_cond_t *) condition->backend))
 568         return -1;
 569
 570       objc_free (condition->backend);
 571       condition->backend = NULL;
 572     }
 573   return 0;
 574 }
 575
 576 /* Wait on the condition */
 577 static inline int
 578 __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
 579 {
 580   if (__gthread_active_p ())
 581     return __gthrw_(pthread_cond_wait) ((pthread_cond_t *) condition->backend,
 582                               (pthread_mutex_t *) mutex->backend);
 583   else
 584     return 0;
 585 }
 586
 587 /* Wake up all threads waiting on this condition.  */
 588 static inline int
 589 __gthread_objc_condition_broadcast (objc_condition_t condition)
 590 {
 591   if (__gthread_active_p ())
 592     return __gthrw_(pthread_cond_broadcast) ((pthread_cond_t *) condition->backend);
 593   else
 594     return 0;
 595 }
 596
 597 /* Wake up one thread waiting on this condition.  */
 598 static inline int
 599 __gthread_objc_condition_signal (objc_condition_t condition)
 600 {
 601   if (__gthread_active_p ())
 602     return __gthrw_(pthread_cond_signal) ((pthread_cond_t *) condition->backend);
 603   else
 604     return 0;
 605 }
 606
 607 #else /* _LIBOBJC */
 608
 609 static inline int
 610 __gthread_once (__gthread_once_t *once, void (*func) (void))
 611 {
 612   if (__gthread_active_p ())
 613     return __gthrw_(pthread_once) (once, func);
 614   else
 615     return -1;
 616 }
 617
 618 static inline int
 619 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
 620 {
 621   return __gthrw_(pthread_key_create) (key, dtor);
 622 }
 623
 624 static inline int
 625 __gthread_key_delete (__gthread_key_t key)
 626 {
 627   return __gthrw_(pthread_key_delete) (key);
 628 }
 629
 630 static inline void *
 631 __gthread_getspecific (__gthread_key_t key)
 632 {
 633   return __gthrw_(pthread_getspecific) (key);
 634 }
 635
 636 static inline int
 637 __gthread_setspecific (__gthread_key_t key, const void *ptr)
 638 {
 639   return __gthrw_(pthread_setspecific) (key, ptr);
 640 }
 641
 642 static inline int
 643 __gthread_mutex_lock (__gthread_mutex_t *mutex)
 644 {
 645   if (__gthread_active_p ())
 646     return __gthrw_(pthread_mutex_lock) (mutex);
 647   else
 648     return 0;
 649 }
 650
 651 static inline int
 652 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
 653 {
 654   if (__gthread_active_p ())
 655     return __gthrw_(pthread_mutex_trylock) (mutex);
 656   else
 657     return 0;
 658 }
 659
 660 static inline int
 661 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
 662 {
 663   if (__gthread_active_p ())
 664     return __gthrw_(pthread_mutex_unlock) (mutex);
 665   else
 666     return 0;
 667 }
 668
 669 static inline int
 670 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
 671 {
 672   mutex->depth = 0;
 673   mutex->owner = (pthread_t) 0;
 674   return __gthrw_(pthread_mutex_init) (&mutex->actual, NULL);
 675 }
 676
 677 static inline int
 678 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
 679 {
 680   if (__gthread_active_p ())
 681     {
 682       pthread_t me = __gthrw_(pthread_self) ();
 683
 684       if (mutex->owner != me)
 685         {
 686           __gthrw_(pthread_mutex_lock) (&mutex->actual);
 687           mutex->owner = me;
 688         }
 689
 690       mutex->depth++;
 691     }
 692   return 0;
 693 }
 694
 695 static inline int
 696 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
 697 {
 698   if (__gthread_active_p ())
 699     {
 700       pthread_t me = __gthrw_(pthread_self) ();
 701
 702       if (mutex->owner != me)
 703         {
 704           if (__gthrw_(pthread_mutex_trylock) (&mutex->actual))
 705             return 1;
 706           mutex->owner = me;
 707         }
 708
 709       mutex->depth++;
 710     }
 711   return 0;
 712 }
 713
 714 static inline int
 715 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
 716 {
 717   if (__gthread_active_p ())
 718     {
 719       if (--mutex->depth == 0)
 720         {
 721            mutex->owner = (pthread_t) 0;
 722            __gthrw_(pthread_mutex_unlock) (&mutex->actual);
 723         }
 724     }
 725   return 0;
 726 }
 727
 728 static inline int
 729 __gthread_cond_broadcast (__gthread_cond_t *cond)
 730 {
 731   return __gthrw_(pthread_cond_broadcast) (cond);
 732 }
 733
 734 static inline int
 735 __gthread_cond_wait (__gthread_cond_t *cond, __gthread_mutex_t *mutex)
 736 {
 737   return __gthrw_(pthread_cond_wait) (cond, mutex);
 738 }
 739
 740 static inline int
 741 __gthread_cond_wait_recursive (__gthread_cond_t *cond,
 742                                __gthread_recursive_mutex_t *mutex)
 743 {
 744   return __gthrw_(pthread_cond_wait) (cond, mutex->actual);
 745 }
 746
 747 #endif /* _LIBOBJC */
 748
 749 #endif /* ! GCC_GTHR_POSIX_H */