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  1. /* Threads compatibility routines for libgcc2 and libobjc.  */
  2. /* Compile this one with gcc.  */
  3. /* Copyright (C) 1997-2015 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 */
  890.