src/thread/generic/SDL_sysmutex.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 10 Jan 2010 05:06:03 +0000
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child 3697 f7b03b6838cb
permissions -rw-r--r--
Reverted r5460 ... this was merged from 1.2, but was later reverted there.
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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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/* An implementation of mutexes using semaphores */
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#include "SDL_thread.h"
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#include "SDL_systhread_c.h"
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struct SDL_mutex
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{
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    int recursive;
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    SDL_threadID owner;
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    SDL_sem *sem;
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};
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/* Create a mutex */
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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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    /* Allocate mutex memory */
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    mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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    if (mutex) {
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        /* Create the mutex semaphore, with initial value 1 */
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        mutex->sem = SDL_CreateSemaphore(1);
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        mutex->recursive = 0;
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        mutex->owner = 0;
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        if (!mutex->sem) {
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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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/* Free the mutex */
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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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        if (mutex->sem) {
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            SDL_DestroySemaphore(mutex->sem);
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        }
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        SDL_free(mutex);
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    }
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}
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/* Lock the semaphore */
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int
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SDL_mutexP(SDL_mutex * mutex)
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{
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#if SDL_THREADS_DISABLED
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    return 0;
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#else
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    SDL_threadID this_thread;
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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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    this_thread = SDL_ThreadID();
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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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        SDL_SemWait(mutex->sem);
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        mutex->owner = this_thread;
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        mutex->recursive = 0;
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    }
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    return 0;
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#endif /* SDL_THREADS_DISABLED */
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}
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/* Unlock the mutex */
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int
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SDL_mutexV(SDL_mutex * mutex)
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{
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#if SDL_THREADS_DISABLED
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    return 0;
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#else
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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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    /* If we don't own the mutex, we can't unlock it */
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    if (SDL_ThreadID() != mutex->owner) {
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        SDL_SetError("mutex not owned by this thread");
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        return -1;
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    }
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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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        SDL_SemPost(mutex->sem);
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    }
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    return 0;
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#endif /* SDL_THREADS_DISABLED */
0
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}
1895
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/* vi: set ts=4 sw=4 expandtab: */