view src/thread/dc/SDL_syssem.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
parents c121d94672cb
children 99210400e8b9
line wrap: on
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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"

/* An implementation of semaphores using mutexes and condition variables */

#include "SDL_timer.h"
#include "SDL_thread.h"
#include "SDL_systhread_c.h"


#if SDL_THREADS_DISABLED

SDL_sem *
SDL_CreateSemaphore(Uint32 initial_value)
{
    SDL_SetError("SDL not configured with thread support");
    return (SDL_sem *) 0;
}

void
SDL_DestroySemaphore(SDL_sem * sem)
{
    return;
}

int
SDL_SemTryWait(SDL_sem * sem)
{
    SDL_SetError("SDL not configured with thread support");
    return -1;
}

int
SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
{
    SDL_SetError("SDL not configured with thread support");
    return -1;
}

int
SDL_SemWait(SDL_sem * sem)
{
    SDL_SetError("SDL not configured with thread support");
    return -1;
}

Uint32
SDL_SemValue(SDL_sem * sem)
{
    return 0;
}

int
SDL_SemPost(SDL_sem * sem)
{
    SDL_SetError("SDL not configured with thread support");
    return -1;
}

#else

#include <kos/sem.h>

struct SDL_semaphore
{
    semaphore_t sem;
};

SDL_sem *
SDL_CreateSemaphore(Uint32 initial_value)
{
    return (SDL_sem *) sem_create(initial_value);
}

/* WARNING:
   You cannot call this function when another thread is using the semaphore.
*/
void
SDL_DestroySemaphore(SDL_sem * sem)
{
    if (!sem) {
        SDL_SetError("Passed a NULL semaphore");
        return;
    }

    sem_destroy(&sem->sem);
}

int
SDL_SemTryWait(SDL_sem * sem)
{
    int retval;

    if (!sem) {
        SDL_SetError("Passed a NULL semaphore");
        return -1;
    }

    retval = sem_trywait(&sem->sem);
    if (retval == 0)
        return 0;
    else
        return SDL_MUTEX_TIMEDOUT;

    return retval;
}

int
SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
{
    int retval;

    if (!sem) {
        SDL_SetError("Passed a NULL semaphore");
        return -1;
    }

    /* A timeout of 0 is an easy case */
    if (timeout == 0) {
        return SDL_SemTryWait(sem);
    }

    retval = sem_wait_timed(&sem->sem, timeout);
    if (retval == -1)
        retval = SDL_MUTEX_TIMEDOUT;

    return retval;
}

int
SDL_SemWait(SDL_sem * sem)
{
    if (!sem) {
        SDL_SetError("Passed a NULL semaphore");
        return -1;
    }

    sem_wait(&sem->sem);
    return 0;
}

Uint32
SDL_SemValue(SDL_sem * sem)
{
    if (!sem) {
        SDL_SetError("Passed a NULL semaphore");
        return -1;
    }

    return sem_count(&sem->sem);
}

int
SDL_SemPost(SDL_sem * sem)
{
    if (!sem) {
        SDL_SetError("Passed a NULL semaphore");
        return -1;
    }

    sem_signal(&sem->sem);
    return 0;
}

#endif /* SDL_THREADS_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */