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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc2/] [gcc/] [gthr-posix95.h] - Rev 686
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/* Threads compatibility routines for libgcc2 and libobjc. */ /* Compile this one with gcc. */ /* Copyright (C) 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #ifndef GCC_GTHR_POSIX_H #define GCC_GTHR_POSIX_H /* POSIX threads specific definitions. Easy, since the interface is just one-to-one mapping. */ #define __GTHREADS 1 /* Some implementations of <pthread.h> require this to be defined. */ #ifndef _REENTRANT #define _REENTRANT 1 #endif #include <pthread.h> #include <unistd.h> typedef pthread_key_t __gthread_key_t; typedef pthread_once_t __gthread_once_t; typedef pthread_mutex_t __gthread_mutex_t; typedef pthread_cond_t __gthread_cond_t; /* POSIX like conditional variables are supported. Please look at comments in gthr.h for details. */ #define __GTHREAD_HAS_COND 1 typedef struct { long depth; pthread_t owner; pthread_mutex_t actual; } __gthread_recursive_mutex_t; #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function #define __GTHREAD_COND_INIT PTHREAD_COND_INITIALIZER #if SUPPORTS_WEAK && GTHREAD_USE_WEAK # define __gthrw(name) \ static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name))); # define __gthrw_(name) __gthrw_ ## name #else # define __gthrw(name) # define __gthrw_(name) name #endif __gthrw(pthread_once) __gthrw(pthread_key_create) __gthrw(pthread_key_delete) __gthrw(pthread_getspecific) __gthrw(pthread_setspecific) __gthrw(pthread_create) __gthrw(pthread_cancel) __gthrw(pthread_self) __gthrw(pthread_mutex_init) __gthrw(pthread_mutex_destroy) __gthrw(pthread_mutex_lock) __gthrw(pthread_mutex_trylock) __gthrw(pthread_mutex_unlock) __gthrw(pthread_mutexattr_init) __gthrw(pthread_mutexattr_destroy) __gthrw(pthread_cond_broadcast) __gthrw(pthread_cond_wait) #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK) /* Objective-C. */ __gthrw(pthread_cond_destroy) __gthrw(pthread_cond_init) __gthrw(pthread_cond_signal) __gthrw(pthread_exit) #ifdef _POSIX_PRIORITY_SCHEDULING #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING __gthrw(sched_get_priority_max) __gthrw(sched_get_priority_min) #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ #endif /* _POSIX_PRIORITY_SCHEDULING */ __gthrw(sched_yield) __gthrw(pthread_attr_destroy) __gthrw(pthread_attr_init) __gthrw(pthread_attr_setdetachstate) #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING __gthrw(pthread_getschedparam) __gthrw(pthread_setschedparam) #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ #endif /* _LIBOBJC || _LIBOBJC_WEAK */ #if SUPPORTS_WEAK && GTHREAD_USE_WEAK /* On Solaris 2.6 up to 9, the libc exposes a POSIX threads interface even if -pthreads is not specified. The functions are dummies and most return an error value. However pthread_once returns 0 without invoking the routine it is passed so we cannot pretend that the interface is active if -pthreads is not specified. On Solaris 2.5.1, the interface is not exposed at all so we need to play the usual game with weak symbols. On Solaris 10 and up, a working interface is always exposed. On FreeBSD 6 and later, libc also exposes a dummy POSIX threads interface, similar to what Solaris 2.6 up to 9 does. FreeBSD >= 700014 even provides a pthread_cancel stub in libc, which means the alternate __gthread_active_p below cannot be used there. */ #if defined(__FreeBSD__) || (defined(__sun) && defined(__svr4__)) static volatile int __gthread_active = -1; static void __gthread_trigger (void) { __gthread_active = 1; } static inline int __gthread_active_p (void) { static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER; static pthread_once_t __gthread_active_once = PTHREAD_ONCE_INIT; /* Avoid reading __gthread_active twice on the main code path. */ int __gthread_active_latest_value = __gthread_active; /* This test is not protected to avoid taking a lock on the main code path so every update of __gthread_active in a threaded program must be atomic with regard to the result of the test. */ if (__builtin_expect (__gthread_active_latest_value < 0, 0)) { if (__gthrw_(pthread_once)) { /* If this really is a threaded program, then we must ensure that __gthread_active has been set to 1 before exiting this block. */ __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex); __gthrw_(pthread_once) (&__gthread_active_once, __gthread_trigger); __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex); } /* Make sure we'll never enter this block again. */ if (__gthread_active < 0) __gthread_active = 0; __gthread_active_latest_value = __gthread_active; } return __gthread_active_latest_value != 0; } #else /* neither FreeBSD nor Solaris */ static inline int __gthread_active_p (void) { static void *const __gthread_active_ptr = __extension__ (void *) &__gthrw_(pthread_cancel); return __gthread_active_ptr != 0; } #endif /* FreeBSD or Solaris */ #else /* not SUPPORTS_WEAK */ /* Similar to Solaris, HP-UX 11 for PA-RISC provides stubs for pthread calls in shared flavors of the HP-UX C library. Most of the stubs have no functionality. The details are described in the "libc cumulative patch" for each subversion of HP-UX 11. There are two special interfaces provided for checking whether an application is linked to a pthread library or not. However, these interfaces aren't available in early libc versions. We also can't use pthread_once as some libc versions call the init function. So, we use pthread_create to check whether it is possible to create a thread or not. The stub implementation returns the error number ENOSYS. */ #if defined(__hppa__) && defined(__hpux__) #include <errno.h> static volatile int __gthread_active = -1; static void * __gthread_start (void *arg __attribute__((unused))) { return NULL; } static void __gthread_active_init (void) __attribute__((noinline)); static void __gthread_active_init (void) { static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER; pthread_t t; pthread_attr_t a; int result; __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex); if (__gthread_active < 0) { __gthrw_(pthread_attr_init) (&a); __gthrw_(pthread_attr_setdetachstate) (&a, PTHREAD_CREATE_DETACHED); result = __gthrw_(pthread_create) (&t, &a, __gthread_start, NULL); if (result != ENOSYS) __gthread_active = 1; else __gthread_active = 0; __gthrw_(pthread_attr_destroy) (&a); } __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex); } static inline int __gthread_active_p (void) { /* Avoid reading __gthread_active twice on the main code path. */ int __gthread_active_latest_value = __gthread_active; /* This test is not protected to avoid taking a lock on the main code path so every update of __gthread_active in a threaded program must be atomic with regard to the result of the test. */ if (__builtin_expect (__gthread_active_latest_value < 0, 0)) { __gthread_active_init (); __gthread_active_latest_value = __gthread_active; } return __gthread_active_latest_value != 0; } #else /* not hppa-hpux */ static inline int __gthread_active_p (void) { return 1; } #endif /* hppa-hpux */ #endif /* SUPPORTS_WEAK */ #ifdef _LIBOBJC /* This is the config.h file in libobjc/ */ #include <config.h> #ifdef HAVE_SCHED_H # include <sched.h> #endif /* Key structure for maintaining thread specific storage */ static pthread_key_t _objc_thread_storage; static pthread_attr_t _objc_thread_attribs; /* Thread local storage for a single thread */ static void *thread_local_storage = NULL; /* Backend initialization functions */ /* Initialize the threads subsystem. */ static inline int __gthread_objc_init_thread_system (void) { if (__gthread_active_p ()) { /* Initialize the thread storage key. */ if (__gthrw_(pthread_key_create) (&_objc_thread_storage, NULL) == 0) { /* The normal default detach state for threads is * PTHREAD_CREATE_JOINABLE which causes threads to not die * when you think they should. */ if (__gthrw_(pthread_attr_init) (&_objc_thread_attribs) == 0 && __gthrw_(pthread_attr_setdetachstate) (&_objc_thread_attribs, PTHREAD_CREATE_DETACHED) == 0) return 0; } } return -1; } /* Close the threads subsystem. */ static inline int __gthread_objc_close_thread_system (void) { if (__gthread_active_p () && __gthrw_(pthread_key_delete) (_objc_thread_storage) == 0 && __gthrw_(pthread_attr_destroy) (&_objc_thread_attribs) == 0) return 0; return -1; } /* Backend thread functions */ /* Create a new thread of execution. */ static inline objc_thread_t __gthread_objc_thread_detach (void (*func)(void *), void *arg) { objc_thread_t thread_id; pthread_t new_thread_handle; if (!__gthread_active_p ()) return NULL; if (!(__gthrw_(pthread_create) (&new_thread_handle, NULL, (void *) func, arg))) thread_id = (objc_thread_t) new_thread_handle; else thread_id = NULL; return thread_id; } /* Set the current thread's priority. */ static inline int __gthread_objc_thread_set_priority (int priority) { if (!__gthread_active_p ()) return -1; else { #ifdef _POSIX_PRIORITY_SCHEDULING #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING pthread_t thread_id = __gthrw_(pthread_self) (); int policy; struct sched_param params; int priority_min, priority_max; if (__gthrw_(pthread_getschedparam) (thread_id, &policy, ¶ms) == 0) { if ((priority_max = __gthrw_(sched_get_priority_max) (policy)) == -1) return -1; if ((priority_min = __gthrw_(sched_get_priority_min) (policy)) == -1) return -1; if (priority > priority_max) priority = priority_max; else if (priority < priority_min) priority = priority_min; params.sched_priority = priority; /* * The solaris 7 and several other man pages incorrectly state that * this should be a pointer to policy but pthread.h is universally * at odds with this. */ if (__gthrw_(pthread_setschedparam) (thread_id, policy, ¶ms) == 0) return 0; } #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ #endif /* _POSIX_PRIORITY_SCHEDULING */ return -1; } } /* Return the current thread's priority. */ static inline int __gthread_objc_thread_get_priority (void) { #ifdef _POSIX_PRIORITY_SCHEDULING #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING if (__gthread_active_p ()) { int policy; struct sched_param params; if (__gthrw_(pthread_getschedparam) (__gthrw_(pthread_self) (), &policy, ¶ms) == 0) return params.sched_priority; else return -1; } else #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */ #endif /* _POSIX_PRIORITY_SCHEDULING */ return OBJC_THREAD_INTERACTIVE_PRIORITY; } /* Yield our process time to another thread. */ static inline void __gthread_objc_thread_yield (void) { if (__gthread_active_p ()) __gthrw_(sched_yield) (); } /* Terminate the current thread. */ static inline int __gthread_objc_thread_exit (void) { if (__gthread_active_p ()) /* exit the thread */ __gthrw_(pthread_exit) (&__objc_thread_exit_status); /* Failed if we reached here */ return -1; } /* Returns an integer value which uniquely describes a thread. */ static inline objc_thread_t __gthread_objc_thread_id (void) { if (__gthread_active_p ()) return (objc_thread_t) __gthrw_(pthread_self) (); else return (objc_thread_t) 1; } /* Sets the thread's local storage pointer. */ static inline int __gthread_objc_thread_set_data (void *value) { if (__gthread_active_p ()) return __gthrw_(pthread_setspecific) (_objc_thread_storage, value); else { thread_local_storage = value; return 0; } } /* Returns the thread's local storage pointer. */ static inline void * __gthread_objc_thread_get_data (void) { if (__gthread_active_p ()) return __gthrw_(pthread_getspecific) (_objc_thread_storage); else return thread_local_storage; } /* Backend mutex functions */ /* Allocate a mutex. */ static inline int __gthread_objc_mutex_allocate (objc_mutex_t mutex) { if (__gthread_active_p ()) { mutex->backend = objc_malloc (sizeof (pthread_mutex_t)); if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend, NULL)) { objc_free (mutex->backend); mutex->backend = NULL; return -1; } } return 0; } /* Deallocate a mutex. */ static inline int __gthread_objc_mutex_deallocate (objc_mutex_t mutex) { if (__gthread_active_p ()) { int count; /* * Posix Threads specifically require that the thread be unlocked * for __gthrw_(pthread_mutex_destroy) to work. */ do { count = __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend); if (count < 0) return -1; } while (count); if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend)) return -1; objc_free (mutex->backend); mutex->backend = NULL; } return 0; } /* Grab a lock on a mutex. */ static inline int __gthread_objc_mutex_lock (objc_mutex_t mutex) { if (__gthread_active_p () && __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend) != 0) { return -1; } return 0; } /* Try to grab a lock on a mutex. */ static inline int __gthread_objc_mutex_trylock (objc_mutex_t mutex) { if (__gthread_active_p () && __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 0) { return -1; } return 0; } /* Unlock the mutex */ static inline int __gthread_objc_mutex_unlock (objc_mutex_t mutex) { if (__gthread_active_p () && __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend) != 0) { return -1; } return 0; } /* Backend condition mutex functions */ /* Allocate a condition. */ static inline int __gthread_objc_condition_allocate (objc_condition_t condition) { if (__gthread_active_p ()) { condition->backend = objc_malloc (sizeof (pthread_cond_t)); if (__gthrw_(pthread_cond_init) ((pthread_cond_t *) condition->backend, NULL)) { objc_free (condition->backend); condition->backend = NULL; return -1; } } return 0; } /* Deallocate a condition. */ static inline int __gthread_objc_condition_deallocate (objc_condition_t condition) { if (__gthread_active_p ()) { if (__gthrw_(pthread_cond_destroy) ((pthread_cond_t *) condition->backend)) return -1; objc_free (condition->backend); condition->backend = NULL; } return 0; } /* Wait on the condition */ static inline int __gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex) { if (__gthread_active_p ()) return __gthrw_(pthread_cond_wait) ((pthread_cond_t *) condition->backend, (pthread_mutex_t *) mutex->backend); else return 0; } /* Wake up all threads waiting on this condition. */ static inline int __gthread_objc_condition_broadcast (objc_condition_t condition) { if (__gthread_active_p ()) return __gthrw_(pthread_cond_broadcast) ((pthread_cond_t *) condition->backend); else return 0; } /* Wake up one thread waiting on this condition. */ static inline int __gthread_objc_condition_signal (objc_condition_t condition) { if (__gthread_active_p ()) return __gthrw_(pthread_cond_signal) ((pthread_cond_t *) condition->backend); else return 0; } #else /* _LIBOBJC */ static inline int __gthread_once (__gthread_once_t *__once, void (*__func) (void)) { if (__gthread_active_p ()) return __gthrw_(pthread_once) (__once, __func); else return -1; } static inline int __gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *)) { return __gthrw_(pthread_key_create) (__key, __dtor); } static inline int __gthread_key_delete (__gthread_key_t __key) { return __gthrw_(pthread_key_delete) (__key); } static inline void * __gthread_getspecific (__gthread_key_t __key) { return __gthrw_(pthread_getspecific) (__key); } static inline int __gthread_setspecific (__gthread_key_t __key, const void *__ptr) { return __gthrw_(pthread_setspecific) (__key, __ptr); } static inline int __gthread_mutex_destroy (__gthread_mutex_t *__mutex) { if (__gthread_active_p ()) return __gthrw_(pthread_mutex_destroy) (__mutex); else return 0; } static inline int __gthread_mutex_lock (__gthread_mutex_t *__mutex) { if (__gthread_active_p ()) return __gthrw_(pthread_mutex_lock) (__mutex); else return 0; } static inline int __gthread_mutex_trylock (__gthread_mutex_t *__mutex) { if (__gthread_active_p ()) return __gthrw_(pthread_mutex_trylock) (__mutex); else return 0; } static inline int __gthread_mutex_unlock (__gthread_mutex_t *__mutex) { if (__gthread_active_p ()) return __gthrw_(pthread_mutex_unlock) (__mutex); else return 0; } static inline int __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex) { __mutex->depth = 0; __mutex->owner = (pthread_t) 0; return __gthrw_(pthread_mutex_init) (&__mutex->actual, NULL); } static inline int __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex) { if (__gthread_active_p ()) { pthread_t __me = __gthrw_(pthread_self) (); if (__mutex->owner != __me) { __gthrw_(pthread_mutex_lock) (&__mutex->actual); __mutex->owner = __me; } __mutex->depth++; } return 0; } static inline int __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex) { if (__gthread_active_p ()) { pthread_t __me = __gthrw_(pthread_self) (); if (__mutex->owner != __me) { if (__gthrw_(pthread_mutex_trylock) (&__mutex->actual)) return 1; __mutex->owner = __me; } __mutex->depth++; } return 0; } static inline int __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex) { if (__gthread_active_p ()) { if (--__mutex->depth == 0) { __mutex->owner = (pthread_t) 0; __gthrw_(pthread_mutex_unlock) (&__mutex->actual); } } return 0; } static inline int __gthread_cond_broadcast (__gthread_cond_t *__cond) { return __gthrw_(pthread_cond_broadcast) (__cond); } static inline int __gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex) { return __gthrw_(pthread_cond_wait) (__cond, __mutex); } static inline int __gthread_cond_wait_recursive (__gthread_cond_t *__cond, __gthread_recursive_mutex_t *__mutex) { return __gthrw_(pthread_cond_wait) (__cond, &__mutex->actual); } #endif /* _LIBOBJC */ #endif /* ! GCC_GTHR_POSIX_H */
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