view src/thread/pthread/SDL_syscond.c @ 2320:166400aa33d7

Deleted a call to X__PumpEvents at the end of X11_GL_InitExtensions(). This function is being called from SDL_RecreateWindow at a point when the numwindows value in is incorrect. The result is that an illegal access is being made in X_PumpEvents when it tries to look up the windows ID of the source of an event. Taking out that call does not seem to have any effect on the testgl. But, I would be happy if someone else took a look at this problem and found a fix higher up the stack.
author Bob Pendleton <bob@pendleton.com>
date Sat, 01 Mar 2008 20:34:36 +0000 (2008-03-01)
parents c121d94672cb
children 99210400e8b9
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>

#include "SDL_thread.h"
#include "SDL_sysmutex_c.h"

struct SDL_cond
{
    pthread_cond_t cond;
};

/* Create a condition variable */
SDL_cond *
SDL_CreateCond(void)
{
    SDL_cond *cond;

    cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
    if (cond) {
        if (pthread_cond_init(&cond->cond, NULL) < 0) {
            SDL_SetError("pthread_cond_init() failed");
            SDL_free(cond);
            cond = NULL;
        }
    }
    return (cond);
}

/* Destroy a condition variable */
void
SDL_DestroyCond(SDL_cond * cond)
{
    if (cond) {
        pthread_cond_destroy(&cond->cond);
        SDL_free(cond);
    }
}

/* Restart one of the threads that are waiting on the condition variable */
int
SDL_CondSignal(SDL_cond * cond)
{
    int retval;

    if (!cond) {
        SDL_SetError("Passed a NULL condition variable");
        return -1;
    }

    retval = 0;
    if (pthread_cond_signal(&cond->cond) != 0) {
        SDL_SetError("pthread_cond_signal() failed");
        retval = -1;
    }
    return retval;
}

/* Restart all threads that are waiting on the condition variable */
int
SDL_CondBroadcast(SDL_cond * cond)
{
    int retval;

    if (!cond) {
        SDL_SetError("Passed a NULL condition variable");
        return -1;
    }

    retval = 0;
    if (pthread_cond_broadcast(&cond->cond) != 0) {
        SDL_SetError("pthread_cond_broadcast() failed");
        retval = -1;
    }
    return retval;
}

int
SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms)
{
    int retval;
    struct timeval delta;
    struct timespec abstime;

    if (!cond) {
        SDL_SetError("Passed a NULL condition variable");
        return -1;
    }

    gettimeofday(&delta, NULL);

    abstime.tv_sec = delta.tv_sec + (ms / 1000);
    abstime.tv_nsec = (delta.tv_usec + (ms % 1000) * 1000) * 1000;
    if (abstime.tv_nsec > 1000000000) {
        abstime.tv_sec += 1;
        abstime.tv_nsec -= 1000000000;
    }

  tryagain:
    retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
    switch (retval) {
    case EINTR:
        goto tryagain;
        break;
    case ETIMEDOUT:
        retval = SDL_MUTEX_TIMEDOUT;
        break;
    case 0:
        break;
    default:
        SDL_SetError("pthread_cond_timedwait() failed");
        retval = -1;
        break;
    }
    return retval;
}

/* Wait on the condition variable, unlocking the provided mutex.
   The mutex must be locked before entering this function!
 */
int
SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)
{
    int retval;

    if (!cond) {
        SDL_SetError("Passed a NULL condition variable");
        return -1;
    }

    retval = 0;
    if (pthread_cond_wait(&cond->cond, &mutex->id) != 0) {
        SDL_SetError("pthread_cond_wait() failed");
        retval = -1;
    }
    return retval;
}

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