src/thread/pthread/SDL_sysmutex.c
author Ryan C. Gordon <icculus@icculus.org>
Wed, 13 Jan 2010 07:00:20 +0000
changeset 3648 a9d830c05998
parent 3605 55b0a0191163
child 3697 f7b03b6838cb
permissions -rw-r--r--
Fixed build problems with gcc __attribute__.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#define _GNU_SOURCE
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#include <pthread.h>
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#include "SDL_thread.h"
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#if !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX && \
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    !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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#define FAKE_RECURSIVE_MUTEX
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#endif
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struct SDL_mutex
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{
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    pthread_mutex_t id;
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#if FAKE_RECURSIVE_MUTEX
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    int recursive;
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    pthread_t owner;
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#endif
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};
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SDL_mutex *
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SDL_CreateMutex(void)
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{
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    SDL_mutex *mutex;
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    pthread_mutexattr_t attr;
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    /* Allocate the structure */
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    mutex = (SDL_mutex *) SDL_calloc(1, sizeof(*mutex));
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    if (mutex) {
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        pthread_mutexattr_init(&attr);
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#if SDL_THREAD_PTHREAD_RECURSIVE_MUTEX
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        pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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#elif SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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        pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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#else
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        /* No extra attributes necessary */
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#endif
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        if (pthread_mutex_init(&mutex->id, &attr) != 0) {
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            SDL_SetError("pthread_mutex_init() failed");
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            SDL_free(mutex);
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            mutex = NULL;
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        }
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    } else {
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        SDL_OutOfMemory();
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    }
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    return (mutex);
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}
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void
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SDL_DestroyMutex(SDL_mutex * mutex)
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{
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    if (mutex) {
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        pthread_mutex_destroy(&mutex->id);
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        SDL_free(mutex);
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    }
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}
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/* Lock the mutex */
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int
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SDL_mutexP(SDL_mutex * mutex)
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{
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    int retval;
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#if FAKE_RECURSIVE_MUTEX
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    pthread_t this_thread;
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#endif
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    if (mutex == NULL) {
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        SDL_SetError("Passed a NULL mutex");
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        return -1;
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    }
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    retval = 0;
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#if FAKE_RECURSIVE_MUTEX
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    this_thread = pthread_self();
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    if (mutex->owner == this_thread) {
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        ++mutex->recursive;
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    } else {
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        /* The order of operations is important.
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           We set the locking thread id after we obtain the lock
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           so unlocks from other threads will fail.
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         */
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        if (pthread_mutex_lock(&mutex->id) == 0) {
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            mutex->owner = this_thread;
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            mutex->recursive = 0;
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        } else {
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            SDL_SetError("pthread_mutex_lock() failed");
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            retval = -1;
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        }
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    }
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#else
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    if (pthread_mutex_lock(&mutex->id) < 0) {
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        SDL_SetError("pthread_mutex_lock() failed");
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        retval = -1;
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    }
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#endif
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    return retval;
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}
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int
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SDL_mutexV(SDL_mutex * mutex)
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{
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    int retval;
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    if (mutex == NULL) {
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        SDL_SetError("Passed a NULL mutex");
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        return -1;
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    }
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    retval = 0;
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#if FAKE_RECURSIVE_MUTEX
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    /* We can only unlock the mutex if we own it */
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    if (pthread_self() == mutex->owner) {
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        if (mutex->recursive) {
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            --mutex->recursive;
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        } else {
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            /* The order of operations is important.
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               First reset the owner so another thread doesn't lock
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               the mutex and set the ownership before we reset it,
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               then release the lock semaphore.
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             */
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            mutex->owner = 0;
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            pthread_mutex_unlock(&mutex->id);
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        }
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    } else {
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        SDL_SetError("mutex not owned by this thread");
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        retval = -1;
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    }
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#else
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    if (pthread_mutex_unlock(&mutex->id) < 0) {
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        SDL_SetError("pthread_mutex_unlock() failed");
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        retval = -1;
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    }
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#endif /* FAKE_RECURSIVE_MUTEX */
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    return retval;
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}
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/* vi: set ts=4 sw=4 expandtab: */