| /* Threads compatibility routines for libgcc2 and libobjc. */ |
| /* Compile this one with gcc. */ |
| /* Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 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 2, 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. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING. If not, write to the Free |
| Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, USA. */ |
| |
| /* As a special exception, if you link this library with other files, |
| some of which are compiled with GCC, to produce an executable, |
| this library does not by itself cause the resulting executable |
| to be covered by the GNU General Public License. |
| This exception does not however invalidate any other reasons why |
| the executable file might be covered by the GNU General Public License. */ |
| |
| #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. */ |
| #if !defined(_REENTRANT) && defined(__osf__) |
| #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_mutex_t __gthread_recursive_mutex_t; |
| |
| #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER |
| #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT |
| #if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER) |
| #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER |
| #elif defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP) |
| #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP |
| #else |
| #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function |
| #endif |
| |
| #if SUPPORTS_WEAK && GTHREAD_USE_WEAK |
| # ifndef __gthrw_pragma |
| # define __gthrw_pragma(pragma) |
| # endif |
| # define __gthrw2(name,name2,type) \ |
| static __typeof(type) name __attribute__ ((__weakref__(#name2))); \ |
| __gthrw_pragma(weak type) |
| # define __gthrw_(name) __gthrw_ ## name |
| #else |
| # define __gthrw2(name,name2,type) |
| # define __gthrw_(name) name |
| #endif |
| |
| /* Typically, __gthrw_foo is a weak reference to symbol foo. */ |
| #define __gthrw(name) __gthrw2(__gthrw_ ## name,name,name) |
| |
| /* On Tru64, /usr/include/pthread.h uses #pragma extern_prefix "__" to |
| map a subset of the POSIX pthread API to mangled versions of their |
| names. */ |
| #if defined(__osf__) && defined(_PTHREAD_USE_MANGLED_NAMES_) |
| #define __gthrw3(name) __gthrw2(__gthrw_ ## name, __ ## name, name) |
| __gthrw3(pthread_once) |
| __gthrw3(pthread_getspecific) |
| __gthrw3(pthread_setspecific) |
| __gthrw3(pthread_create) |
| __gthrw3(pthread_cancel) |
| __gthrw3(pthread_mutex_lock) |
| __gthrw3(pthread_mutex_trylock) |
| __gthrw3(pthread_mutex_unlock) |
| __gthrw3(pthread_mutex_init) |
| #else |
| __gthrw(pthread_once) |
| __gthrw(pthread_getspecific) |
| __gthrw(pthread_setspecific) |
| __gthrw(pthread_create) |
| __gthrw(pthread_cancel) |
| __gthrw(pthread_mutex_lock) |
| __gthrw(pthread_mutex_trylock) |
| __gthrw(pthread_mutex_unlock) |
| __gthrw(pthread_mutex_init) |
| #endif |
| |
| __gthrw(pthread_key_create) |
| __gthrw(pthread_key_delete) |
| __gthrw(pthread_mutexattr_init) |
| __gthrw(pthread_mutexattr_settype) |
| __gthrw(pthread_mutexattr_destroy) |
| |
| |
| #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK) |
| /* Objective-C. */ |
| #if defined(__osf__) && defined(_PTHREAD_USE_MANGLED_NAMES_) |
| __gthrw3(pthread_cond_broadcast) |
| __gthrw3(pthread_cond_destroy) |
| __gthrw3(pthread_cond_init) |
| __gthrw3(pthread_cond_signal) |
| __gthrw3(pthread_cond_wait) |
| __gthrw3(pthread_exit) |
| __gthrw3(pthread_mutex_destroy) |
| __gthrw3(pthread_self) |
| #else |
| __gthrw(pthread_cond_broadcast) |
| __gthrw(pthread_cond_destroy) |
| __gthrw(pthread_cond_init) |
| __gthrw(pthread_cond_signal) |
| __gthrw(pthread_cond_wait) |
| __gthrw(pthread_exit) |
| __gthrw(pthread_mutex_destroy) |
| __gthrw(pthread_self) |
| #endif /* __osf__ && _PTHREAD_USE_MANGLED_NAMES_ */ |
| #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. */ |
| |
| #if 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 /* not 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 /* Solaris */ |
| |
| #else /* not SUPPORTS_WEAK */ |
| |
| static inline int |
| __gthread_active_p (void) |
| { |
| return 1; |
| } |
| |
| #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_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; |
| } |
| |
| #ifndef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP |
| static inline int |
| __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) |
| { |
| if (__gthread_active_p ()) |
| { |
| pthread_mutexattr_t attr; |
| int r; |
| |
| r = __gthrw_(pthread_mutexattr_init) (&attr); |
| if (!r) |
| r = __gthrw_(pthread_mutexattr_settype) (&attr, PTHREAD_MUTEX_RECURSIVE); |
| if (!r) |
| r = __gthrw_(pthread_mutex_init) (mutex, &attr); |
| if (!r) |
| r = __gthrw_(pthread_mutexattr_destroy) (&attr); |
| return r; |
| } |
| return 0; |
| } |
| #endif |
| |
| static inline int |
| __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) |
| { |
| return __gthread_mutex_lock (mutex); |
| } |
| |
| static inline int |
| __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) |
| { |
| return __gthread_mutex_trylock (mutex); |
| } |
| |
| static inline int |
| __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) |
| { |
| return __gthread_mutex_unlock (mutex); |
| } |
| |
| #endif /* _LIBOBJC */ |
| |
| #endif /* ! GCC_GTHR_POSIX_H */ |