/*-
 * Copyright (c) 2002-2018 The UbixOS Project.
 * All rights reserved.
 *
 * This was developed by Christopher W. Olsen for the UbixOS Project.
 *
 * 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, the following disclaimer and the list of authors.
 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors in the documentation and/or
 *    other materials provided with the distribution.
 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 COPYRIGHT OWNER 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.
 */

#ifndef _UBIXOS_SEM_H
#define _UBIXOS_SEM_H

#include <sys/types.h>
#include <ubixos/errno.h>
#include <ubixos/ubthread.h>

struct sys_sem {
    uint32_t signaled;
    ubthread_cond_t cond;
    ubthread_mutex_t mutex;
};

typedef struct sys_sem sys_sem_t;

typedef uint32_t semID_t;
struct timespec;

int sem_close(semID_t id);
int sem_post(semID_t id);
int sem_wait(semID_t id);
int sem_trywait(semID_t id);
int sem_timedwait(semID_t id, const struct timespec *);
int sem_init(sys_sem_t **, uint8_t);
int sem_open(semID_t *id, const char *name, int oflag, mode_t mode, unsigned int value);
int sem_unlink(const char *name);
int sem_getvalue(semID_t id, int *val);
int sem_destroy(sys_sem_t **);

#endif /* END _UBIXOS_SEM_H */