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- /* Threads compatibility routines for libgcc2 and libobjc. */
- /* Compile this one with gcc. */
- /* Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003
- 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, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, 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 _GLIBCXX_GCC_GTHR_POSIX_H
- #define _GLIBCXX_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;
-
- #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
- #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
-
- #if __GXX_WEAK__ && _GLIBCXX_GTHREAD_USE_WEAK
-
- #pragma weak pthread_once
- #pragma weak pthread_key_create
- #pragma weak pthread_key_delete
- #pragma weak pthread_getspecific
- #pragma weak pthread_setspecific
- #pragma weak pthread_create
-
- #pragma weak pthread_mutex_lock
- #pragma weak pthread_mutex_trylock
- #pragma weak pthread_mutex_unlock
-
- #if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
- /* Objective-C. */
- #pragma weak pthread_cond_broadcast
- #pragma weak pthread_cond_destroy
- #pragma weak pthread_cond_init
- #pragma weak pthread_cond_signal
- #pragma weak pthread_cond_wait
- #pragma weak pthread_exit
- #pragma weak pthread_mutex_init
- #pragma weak pthread_mutex_destroy
- #pragma weak pthread_self
- /* These really should be protected by _POSIX_PRIORITY_SCHEDULING, but
- we use them inside a _POSIX_THREAD_PRIORITY_SCHEDULING block. */
- #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
- #pragma weak sched_get_priority_max
- #pragma weak sched_get_priority_min
- #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
- #pragma weak sched_yield
- #pragma weak pthread_attr_destroy
- #pragma weak pthread_attr_init
- #pragma weak pthread_attr_setdetachstate
- #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
- #pragma weak pthread_getschedparam
- #pragma weak pthread_setschedparam
- #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
- #endif /* _LIBOBJC || _LIBOBJC_WEAK */
-
- static inline int
- __gthread_active_p (void)
- {
- static void *const __gthread_active_ptr = (void *) &pthread_create;
- return __gthread_active_ptr != 0;
- }
-
- #else /* not __GXX_WEAK__ */
-
- static inline int
- __gthread_active_p (void)
- {
- return 1;
- }
-
- #endif /* __GXX_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 (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 (pthread_attr_init (&_objc_thread_attribs) == 0
- && 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 ()
- && pthread_key_delete (_objc_thread_storage) == 0
- && 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 (!(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_THREAD_PRIORITY_SCHEDULING
- pthread_t thread_id = pthread_self ();
- int policy;
- struct sched_param params;
- int priority_min, priority_max;
-
- if (pthread_getschedparam (thread_id, &policy, ¶ms) == 0)
- {
- if ((priority_max = sched_get_priority_max (policy)) == -1)
- return -1;
-
- if ((priority_min = 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 (pthread_setschedparam (thread_id, policy, ¶ms) == 0)
- return 0;
- }
- #endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
- return -1;
- }
- }
-
- /* Return the current thread's priority. */
- static inline int
- __gthread_objc_thread_get_priority (void)
- {
- #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
- if (__gthread_active_p ())
- {
- int policy;
- struct sched_param params;
-
- if (pthread_getschedparam (pthread_self (), &policy, ¶ms) == 0)
- return params.sched_priority;
- else
- return -1;
- }
- else
- #endif /* _POSIX_THREAD_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 ())
- sched_yield ();
- }
-
- /* Terminate the current thread. */
- static inline int
- __gthread_objc_thread_exit (void)
- {
- if (__gthread_active_p ())
- /* exit the thread */
- 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) 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 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 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 (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 pthread_mutex_destroy to work.
- */
-
- do
- {
- count = pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend);
- if (count < 0)
- return -1;
- }
- while (count);
-
- if (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 ()
- && 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 ()
- && 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 ()
- && 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 (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 (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 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 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 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 pthread_once (once, func);
- else
- return -1;
- }
-
- static inline int
- __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
- {
- return pthread_key_create (key, dtor);
- }
-
- static inline int
- __gthread_key_delete (__gthread_key_t key)
- {
- return pthread_key_delete (key);
- }
-
- static inline void *
- __gthread_getspecific (__gthread_key_t key)
- {
- return pthread_getspecific (key);
- }
-
- static inline int
- __gthread_setspecific (__gthread_key_t key, const void *ptr)
- {
- return pthread_setspecific (key, ptr);
- }
-
- static inline int
- __gthread_mutex_lock (__gthread_mutex_t *mutex)
- {
- if (__gthread_active_p ())
- return pthread_mutex_lock (mutex);
- else
- return 0;
- }
-
- static inline int
- __gthread_mutex_trylock (__gthread_mutex_t *mutex)
- {
- if (__gthread_active_p ())
- return pthread_mutex_trylock (mutex);
- else
- return 0;
- }
-
- static inline int
- __gthread_mutex_unlock (__gthread_mutex_t *mutex)
- {
- if (__gthread_active_p ())
- return pthread_mutex_unlock (mutex);
- else
- return 0;
- }
-
- #endif /* _LIBOBJC */
-
- #endif /* ! _GLIBCXX_GCC_GTHR_POSIX_H */
-