510 lines
12 KiB
C
510 lines
12 KiB
C
/* Threads compatibility routines for libgcc2 and libobjc. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1997, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#ifndef GCC_GTHR_POSIX_H
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#define GCC_GTHR_POSIX_H
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/* POSIX threads specific definitions.
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Easy, since the interface is just one-to-one mapping. */
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#define __GTHREADS 1
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#include <pthread.h>
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typedef pthread_key_t __gthread_key_t;
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typedef pthread_once_t __gthread_once_t;
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typedef pthread_mutex_t __gthread_mutex_t;
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#define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
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#define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
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#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
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#pragma weak pthread_once
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#pragma weak pthread_key_create
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#pragma weak pthread_key_delete
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#pragma weak pthread_getspecific
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#pragma weak pthread_setspecific
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#pragma weak pthread_create
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#pragma weak pthread_mutex_lock
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#pragma weak pthread_mutex_trylock
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#pragma weak pthread_mutex_unlock
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#ifdef _LIBOBJC
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/* Objective C. */
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#pragma weak pthread_cond_broadcast
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#pragma weak pthread_cond_destroy
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#pragma weak pthread_cond_init
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#pragma weak pthread_cond_signal
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#pragma weak pthread_cond_wait
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#pragma weak pthread_exit
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#pragma weak pthread_mutex_init
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#pragma weak pthread_mutex_destroy
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#pragma weak pthread_self
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#pragma weak sched_get_priority_max
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#pragma weak sched_get_priority_min
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#pragma weak sched_yield
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#pragma weak pthread_attr_destroy
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#pragma weak pthread_attr_init
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#pragma weak pthread_attr_setdetachstate
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#pragma weak pthread_getschedparam
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#pragma weak pthread_setschedparam
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#endif
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static inline int
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__gthread_active_p (void)
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{
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static void *const __gthread_active_ptr = (void *) &pthread_create;
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return __gthread_active_ptr != 0;
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}
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#else /* not SUPPORTS_WEAK */
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static inline int
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__gthread_active_p (void)
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{
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return 1;
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}
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#endif /* SUPPORTS_WEAK */
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#ifdef _LIBOBJC
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/* This is the config.h file in libobjc/ */
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#include <config.h>
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#ifdef HAVE_SCHED_H
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# include <sched.h>
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#endif
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/* Key structure for maintaining thread specific storage */
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static pthread_key_t _objc_thread_storage;
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static pthread_attr_t _objc_thread_attribs;
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/* Thread local storage for a single thread */
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static void *thread_local_storage = NULL;
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/* Backend initialization functions */
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/* Initialize the threads subsystem. */
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static inline int
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__gthread_objc_init_thread_system(void)
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{
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if (__gthread_active_p ())
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{
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/* Initialize the thread storage key */
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if (pthread_key_create(&_objc_thread_storage, NULL) == 0)
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{
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/* The normal default detach state for threads is
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* PTHREAD_CREATE_JOINABLE which causes threads to not die
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* when you think they should. */
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if (pthread_attr_init(&_objc_thread_attribs) == 0
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&& pthread_attr_setdetachstate(&_objc_thread_attribs,
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PTHREAD_CREATE_DETACHED) == 0)
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return 0;
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}
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}
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return -1;
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}
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/* Close the threads subsystem. */
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static inline int
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__gthread_objc_close_thread_system(void)
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{
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if (__gthread_active_p ()
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&& pthread_key_delete(_objc_thread_storage) == 0
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&& pthread_attr_destroy(&_objc_thread_attribs) == 0)
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return 0;
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return -1;
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}
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/* Backend thread functions */
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/* Create a new thread of execution. */
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static inline objc_thread_t
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__gthread_objc_thread_detach(void (*func)(void *), void *arg)
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{
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objc_thread_t thread_id;
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pthread_t new_thread_handle;
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if (!__gthread_active_p ())
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return NULL;
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if ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) )
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thread_id = (objc_thread_t) new_thread_handle;
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else
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thread_id = NULL;
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return thread_id;
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}
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/* Set the current thread's priority. */
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static inline int
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__gthread_objc_thread_set_priority(int priority)
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{
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if (!__gthread_active_p())
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return -1;
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else {
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pthread_t thread_id = pthread_self();
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int policy;
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struct sched_param params;
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int priority_min, priority_max;
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if (pthread_getschedparam(thread_id, &policy, ¶ms) == 0)
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{
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if ((priority_max = sched_get_priority_max(policy)) != 0)
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return -1;
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if ((priority_min = sched_get_priority_min(policy)) != 0)
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return -1;
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if (priority > priority_max)
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priority = priority_max;
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else if (priority < priority_min)
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priority = priority_min;
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params.sched_priority = priority;
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/*
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* The solaris 7 and several other man pages incorrectly state that
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* this should be a pointer to policy but pthread.h is universally
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* at odds with this.
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*/
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if (pthread_setschedparam(thread_id, policy, ¶ms) == 0)
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return 0;
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}
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return -1;
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}
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}
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/* Return the current thread's priority. */
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static inline int
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__gthread_objc_thread_get_priority(void)
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{
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if (__gthread_active_p ())
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{
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int policy;
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struct sched_param params;
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if (pthread_getschedparam(pthread_self(), &policy, ¶ms) == 0)
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return params.sched_priority;
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else
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return -1;
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}
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else
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return OBJC_THREAD_INTERACTIVE_PRIORITY;
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}
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/* Yield our process time to another thread. */
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static inline void
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__gthread_objc_thread_yield(void)
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{
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if (__gthread_active_p ())
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sched_yield();
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}
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/* Terminate the current thread. */
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static inline int
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__gthread_objc_thread_exit(void)
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{
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if (__gthread_active_p ())
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/* exit the thread */
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pthread_exit(&__objc_thread_exit_status);
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/* Failed if we reached here */
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return -1;
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}
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/* Returns an integer value which uniquely describes a thread. */
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static inline objc_thread_t
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__gthread_objc_thread_id(void)
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{
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if (__gthread_active_p ())
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return (objc_thread_t) pthread_self();
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else
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return (objc_thread_t) 1;
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}
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/* Sets the thread's local storage pointer. */
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static inline int
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__gthread_objc_thread_set_data(void *value)
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{
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if (__gthread_active_p ())
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return pthread_setspecific(_objc_thread_storage, value);
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else
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{
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thread_local_storage = value;
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return 0;
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}
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}
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/* Returns the thread's local storage pointer. */
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static inline void *
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__gthread_objc_thread_get_data(void)
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{
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if (__gthread_active_p ())
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return pthread_getspecific(_objc_thread_storage);
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else
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return thread_local_storage;
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}
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/* Backend mutex functions */
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/* Allocate a mutex. */
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static inline int
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__gthread_objc_mutex_allocate(objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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{
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mutex->backend = objc_malloc(sizeof(pthread_mutex_t));
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if (pthread_mutex_init((pthread_mutex_t *)mutex->backend, NULL))
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{
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objc_free(mutex->backend);
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mutex->backend = NULL;
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return -1;
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}
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}
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return 0;
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}
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/* Deallocate a mutex. */
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static inline int
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__gthread_objc_mutex_deallocate(objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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{
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int count;
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/*
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* Posix Threads specifically require that the thread be unlocked
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* for pthread_mutex_destroy to work.
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*/
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do
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{
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count = pthread_mutex_unlock((pthread_mutex_t *)mutex->backend);
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if (count < 0)
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return -1;
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}
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while (count);
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if (pthread_mutex_destroy((pthread_mutex_t *)mutex->backend))
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return -1;
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objc_free(mutex->backend);
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mutex->backend = NULL;
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}
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return 0;
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}
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/* Grab a lock on a mutex. */
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static inline int
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__gthread_objc_mutex_lock(objc_mutex_t mutex)
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{
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if (__gthread_active_p ()
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&& pthread_mutex_lock((pthread_mutex_t *)mutex->backend) != 0)
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{
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return -1;
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}
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return 0;
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}
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/* Try to grab a lock on a mutex. */
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static inline int
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__gthread_objc_mutex_trylock(objc_mutex_t mutex)
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{
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if (__gthread_active_p ()
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&& pthread_mutex_trylock((pthread_mutex_t *)mutex->backend) != 0)
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{
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return -1;
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}
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return 0;
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}
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/* Unlock the mutex */
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static inline int
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__gthread_objc_mutex_unlock(objc_mutex_t mutex)
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{
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if (__gthread_active_p ()
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&& pthread_mutex_unlock((pthread_mutex_t *)mutex->backend) != 0)
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{
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return -1;
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}
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return 0;
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}
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/* Backend condition mutex functions */
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/* Allocate a condition. */
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static inline int
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__gthread_objc_condition_allocate(objc_condition_t condition)
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{
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if (__gthread_active_p ())
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{
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condition->backend = objc_malloc(sizeof(pthread_cond_t));
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if (pthread_cond_init((pthread_cond_t *)condition->backend, NULL))
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{
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objc_free(condition->backend);
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condition->backend = NULL;
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return -1;
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}
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}
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return 0;
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}
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/* Deallocate a condition. */
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static inline int
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__gthread_objc_condition_deallocate(objc_condition_t condition)
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{
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if (__gthread_active_p ())
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{
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if (pthread_cond_destroy((pthread_cond_t *)condition->backend))
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return -1;
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objc_free(condition->backend);
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condition->backend = NULL;
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}
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return 0;
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}
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/* Wait on the condition */
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static inline int
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__gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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return pthread_cond_wait((pthread_cond_t *)condition->backend,
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(pthread_mutex_t *)mutex->backend);
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else
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return 0;
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}
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/* Wake up all threads waiting on this condition. */
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static inline int
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__gthread_objc_condition_broadcast(objc_condition_t condition)
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{
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if (__gthread_active_p ())
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return pthread_cond_broadcast((pthread_cond_t *)condition->backend);
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else
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return 0;
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}
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/* Wake up one thread waiting on this condition. */
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static inline int
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__gthread_objc_condition_signal(objc_condition_t condition)
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{
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if (__gthread_active_p ())
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return pthread_cond_signal((pthread_cond_t *)condition->backend);
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else
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return 0;
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}
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#else /* _LIBOBJC */
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static inline int
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__gthread_once (__gthread_once_t *once, void (*func) (void))
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{
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if (__gthread_active_p ())
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return pthread_once (once, func);
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else
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return -1;
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}
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static inline int
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__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
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{
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return pthread_key_create (key, dtor);
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}
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static inline int
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__gthread_key_dtor (__gthread_key_t key, void *ptr)
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{
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/* Just reset the key value to zero. */
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if (ptr)
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return pthread_setspecific (key, 0);
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else
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return 0;
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}
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static inline int
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__gthread_key_delete (__gthread_key_t key)
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{
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return pthread_key_delete (key);
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}
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static inline void *
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__gthread_getspecific (__gthread_key_t key)
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{
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return pthread_getspecific (key);
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}
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static inline int
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__gthread_setspecific (__gthread_key_t key, const void *ptr)
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{
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return pthread_setspecific (key, ptr);
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}
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static inline int
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__gthread_mutex_lock (__gthread_mutex_t *mutex)
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{
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if (__gthread_active_p ())
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return pthread_mutex_lock (mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_trylock (__gthread_mutex_t *mutex)
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{
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if (__gthread_active_p ())
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return pthread_mutex_trylock (mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_unlock (__gthread_mutex_t *mutex)
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{
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if (__gthread_active_p ())
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return pthread_mutex_unlock (mutex);
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else
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return 0;
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}
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#endif /* _LIBOBJC */
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#endif /* ! GCC_GTHR_POSIX_H */
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