src/thread/pthread/SDL_syscond.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 10 Jan 2010 05:06:03 +0000
changeset 3623 9a73fecd9181
parent 2859 99210400e8b9
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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#include <sys/time.h>
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#include <unistd.h>
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#include <errno.h>
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#include <pthread.h>
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#include "SDL_thread.h"
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#include "SDL_sysmutex_c.h"
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struct SDL_cond
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{
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    pthread_cond_t cond;
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};
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/* Create a condition variable */
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SDL_cond *
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SDL_CreateCond(void)
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{
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    SDL_cond *cond;
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    cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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    if (cond) {
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        if (pthread_cond_init(&cond->cond, NULL) < 0) {
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            SDL_SetError("pthread_cond_init() failed");
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            SDL_free(cond);
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            cond = NULL;
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        }
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    }
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    return (cond);
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}
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/* Destroy a condition variable */
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void
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SDL_DestroyCond(SDL_cond * cond)
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{
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    if (cond) {
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        pthread_cond_destroy(&cond->cond);
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        SDL_free(cond);
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    }
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}
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/* Restart one of the threads that are waiting on the condition variable */
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int
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SDL_CondSignal(SDL_cond * cond)
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{
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    int retval;
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    if (!cond) {
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        SDL_SetError("Passed a NULL condition variable");
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        return -1;
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    }
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    retval = 0;
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    if (pthread_cond_signal(&cond->cond) != 0) {
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        SDL_SetError("pthread_cond_signal() failed");
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        retval = -1;
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    }
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    return retval;
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}
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/* Restart all threads that are waiting on the condition variable */
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int
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SDL_CondBroadcast(SDL_cond * cond)
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{
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    int retval;
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    if (!cond) {
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        SDL_SetError("Passed a NULL condition variable");
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        return -1;
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    }
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    retval = 0;
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    if (pthread_cond_broadcast(&cond->cond) != 0) {
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        SDL_SetError("pthread_cond_broadcast() failed");
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        retval = -1;
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    }
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    return retval;
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}
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int
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SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms)
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{
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    int retval;
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    struct timeval delta;
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    struct timespec abstime;
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    if (!cond) {
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        SDL_SetError("Passed a NULL condition variable");
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        return -1;
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    }
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    gettimeofday(&delta, NULL);
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    abstime.tv_sec = delta.tv_sec + (ms / 1000);
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    abstime.tv_nsec = (delta.tv_usec + (ms % 1000) * 1000) * 1000;
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    if (abstime.tv_nsec > 1000000000) {
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        abstime.tv_sec += 1;
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        abstime.tv_nsec -= 1000000000;
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    }
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  tryagain:
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    retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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    switch (retval) {
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   126
    case EINTR:
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        goto tryagain;
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   128
        break;
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   129
    case ETIMEDOUT:
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        retval = SDL_MUTEX_TIMEDOUT;
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   131
        break;
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   132
    case 0:
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   133
        break;
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   134
    default:
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   135
        SDL_SetError("pthread_cond_timedwait() failed");
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   136
        retval = -1;
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   137
        break;
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   138
    }
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   139
    return retval;
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   140
}
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   141
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   142
/* Wait on the condition variable, unlocking the provided mutex.
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   143
   The mutex must be locked before entering this function!
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   144
 */
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   145
int
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   146
SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)
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{
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   148
    int retval;
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   149
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   150
    if (!cond) {
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   151
        SDL_SetError("Passed a NULL condition variable");
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   152
        return -1;
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   153
    }
1361
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diff changeset
   154
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   155
    retval = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   156
    if (pthread_cond_wait(&cond->cond, &mutex->id) != 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   157
        SDL_SetError("pthread_cond_wait() failed");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   158
        retval = -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
   159
    }
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   160
    return retval;
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   161
}
1361
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diff changeset
   162
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   163
/* vi: set ts=4 sw=4 expandtab: */