sem.h
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/****************************************************************************
*
* Copyright (c) 2016 PX4 Development Team. All rights reserved.
*
* 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.
* 3. Neither the name PX4 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 COPYRIGHT HOLDERS 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.
*
****************************************************************************/
/**
* @file sem.h
*
* Synchronization primitive: Semaphore
*/
#pragma once
#include <semaphore.h>
#if !defined(__PX4_NUTTX)
/* Values for protocol attribute */
#define SEM_PRIO_NONE 0
#define SEM_PRIO_INHERIT 1
#define SEM_PRIO_PROTECT 2
#define sem_setprotocol(s,p)
#endif
#if (defined(__PX4_DARWIN) || defined(__PX4_CYGWIN) || defined(__PX4_POSIX)) && !defined(__PX4_QURT)
__BEGIN_DECLS
typedef struct {
pthread_mutex_t lock;
pthread_cond_t wait;
int value;
} px4_sem_t;
__EXPORT int px4_sem_init(px4_sem_t *s, int pshared, unsigned value);
__EXPORT int px4_sem_setprotocol(px4_sem_t *s, int protocol);
__EXPORT int px4_sem_wait(px4_sem_t *s);
__EXPORT int px4_sem_trywait(px4_sem_t *sem);
__EXPORT int px4_sem_timedwait(px4_sem_t *sem, const struct timespec *abstime);
__EXPORT int px4_sem_post(px4_sem_t *s);
__EXPORT int px4_sem_getvalue(px4_sem_t *s, int *sval);
__EXPORT int px4_sem_destroy(px4_sem_t *s);
__END_DECLS
//#elif defined(__PX4_QURT)
//typedef sem_t px4_sem_t;
//#define px4_sem_init sem_init
//#define px4_sem_setprotocol sem_setprotocol
//#define px4_sem_wait sem_wait
//#define px4_sem_trywait sem_trywait
//#define px4_sem_post sem_post
//#define px4_sem_getvalue sem_getvalue
//#define px4_sem_destroy sem_destroy
#else
typedef sem_t px4_sem_t;
__BEGIN_DECLS
#define px4_sem_init sem_init
#define px4_sem_setprotocol sem_setprotocol
#define px4_sem_wait sem_wait
#define px4_sem_trywait sem_trywait
#define px4_sem_post sem_post
#define px4_sem_getvalue sem_getvalue
#define px4_sem_destroy sem_destroy
#if defined(__PX4_QURT)
__EXPORT int px4_sem_timedwait(px4_sem_t *sem, const struct timespec *abstime);
#else
#define px4_sem_timedwait sem_timedwait
#endif
__END_DECLS
#endif