/*      $NetBSD: cnd.c,v 1.1 2019/04/24 11:43:19 kamil Exp $    */

/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Kamil Rytarowski.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: cnd.c,v 1.1 2019/04/24 11:43:19 kamil Exp $");

#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <threads.h>

int
cnd_broadcast(cnd_t *cond)
{

       _DIAGASSERT(cond != NULL);

       if (pthread_cond_broadcast(cond) == 0)
               return thrd_success;

       return thrd_error;
}

void
cnd_destroy(cnd_t *cond)
{

       _DIAGASSERT(cond != NULL);

       /*
        * The cnd_destroy(3) function that conforms to C11 returns no value.
        */
       (void)pthread_cond_destroy(cond);
}

int
cnd_init(cnd_t *cond)
{

       _DIAGASSERT(cond != NULL);

       if (pthread_cond_init(cond, NULL) == 0)
               return thrd_success;

       return thrd_error;
}

int
cnd_signal(cnd_t *cond)
{

       _DIAGASSERT(cond != NULL);

       if (pthread_cond_signal(cond) == 0)
               return thrd_success;

       return thrd_error;
}

int
cnd_timedwait(cnd_t * __restrict cond, mtx_t * __restrict mtx,
           const struct timespec * __restrict ts)
{

       _DIAGASSERT(cond != NULL);
       _DIAGASSERT(mtx != NULL);
       _DIAGASSERT(ts != NULL);

       switch (pthread_cond_timedwait(cond, mtx, ts)) {
       case 0:
               return thrd_success;
       case ETIMEDOUT:
               return thrd_timedout;
       default:
               return thrd_error;
       }
}

int
cnd_wait(cnd_t *cond, mtx_t *mtx)
{

       _DIAGASSERT(cond != NULL);
       _DIAGASSERT(mtx != NULL);

       if (pthread_cond_wait(cond, mtx) == 0)
               return thrd_success;

       return thrd_error;
}