/*+
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    SDL - Simple DirectMedia Layer+
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    Copyright (C) 1997-2006 Sam Lantinga+
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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#include "SDL_thread.h"+
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#include "SDL_sysmutex_c.h"+
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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    gettimeofday(&delta, NULL);+
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+
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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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+
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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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    case EINTR:+
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        goto tryagain;+
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        break;+
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    case ETIMEDOUT:+
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        retval = SDL_MUTEX_TIMEDOUT;+
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        break;+
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    case 0:+
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        break;+
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    default:+
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        SDL_SetError("pthread_cond_timedwait() failed");+
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        retval = -1;+
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        break;+
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    }+
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    return retval;+
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}+
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+
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/* Wait on the condition variable, unlocking the provided mutex.+
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   The mutex must be locked before entering this function!+
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 */+
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int+
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SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex)+
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{+
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    int retval;+
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+
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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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+
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    retval = 0;+
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    if (pthread_cond_wait(&cond->cond, &mutex->id) != 0) {+
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        SDL_SetError("pthread_cond_wait() 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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+
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/* vi: set ts=4 sw=4 expandtab: */+
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