/* Copyright (c) 2009 The Khronos Group Inc.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and/or associated documentation files (the

 * "Materials"), to deal in the Materials without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Materials, and to

 * permit persons to whom the Materials are furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Materials.

 *

 * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

 */

#include <errno.h>

#include <time.h>

#include <semaphore.h>

#include <stdlib.h>

#include "owfsemaphore.h"

#include "owfmemory.h"

#define SEM(x)          (sem_t*)(*x)

OWF_API_CALL OWFint

OWF_Semaphore_Init(OWF_SEMAPHORE* sem, OWFint val)

{

    *sem = xalloc(1, sizeof(sem_t));

    if (!*sem) {

        return ENOMEM;

    }

    return sem_init(SEM(sem), 0, val);

}

OWF_API_CALL OWFint

OWF_Semaphore_Wait(OWF_SEMAPHORE* sem)

{

    if (!*sem) {

        return EINVAL;

    }

    return sem_wait(SEM(sem));

}

OWF_API_CALL OWFint

OWF_Semaphore_TryWait(OWF_SEMAPHORE* sem)

{

    if (!*sem) {

        return EINVAL;

    }

    return sem_trywait(SEM(sem));

}

OWF_API_CALL void

OWF_Semaphore_Post(OWF_SEMAPHORE* sem)

{

    if (!*sem) {

        return;

    }

    sem_post(SEM(sem));

}

OWF_API_CALL OWFint

OWF_Semaphore_GetValue(OWF_SEMAPHORE* sem, OWFint* val)

{

    if (!*sem) {

        return EINVAL;

    }

    return sem_getvalue(SEM(sem), (int *)val);

}

OWF_API_CALL OWFint

OWF_Semaphore_Destroy(OWF_SEMAPHORE* sem)

{

    OWFint             err = EINVAL;

    if (*sem) {

        err = sem_destroy(SEM(sem));

        xfree(*sem);

        *sem = NULL;

    }

    return err;

}