coap_mutex.h
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/*
* coap_mutex.h -- mutex utilities
*
* Copyright (C) 2019 Jon Shallow <supjps-libcoap@jpshallow.com>
* 2019 Olaf Bergmann <bergmann@tzi.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* This file is part of the CoAP library libcoap. Please see README for terms
* of use.
*/
#ifndef COAP_MUTEX_H_
#define COAP_MUTEX_H_
/*
* Mutexes are currently only used if there is a constrained stack,
* and large static variables (instead of the large variable being on
* the stack) need to be protected.
*/
#if COAP_CONSTRAINED_STACK
#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK)
#include <pthread.h>
typedef pthread_mutex_t coap_mutex_t;
#define COAP_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
#define coap_mutex_lock(a) pthread_mutex_lock(a)
#define coap_mutex_trylock(a) pthread_mutex_trylock(a)
#define coap_mutex_unlock(a) pthread_mutex_unlock(a)
#elif defined(RIOT_VERSION)
/* use RIOT's mutex API */
#include <mutex.h>
typedef mutex_t coap_mutex_t;
#define COAP_MUTEX_INITIALIZER MUTEX_INIT
#define coap_mutex_lock(a) mutex_lock(a)
#define coap_mutex_trylock(a) mutex_trylock(a)
#define coap_mutex_unlock(a) mutex_unlock(a)
#else
/* define stub mutex functions */
typedef int coap_mutex_t;
#define COAP_MUTEX_INITIALIZER 0
#define coap_mutex_lock(a) *(a) = 1
#define coap_mutex_trylock(a) *(a) = 1
#define coap_mutex_unlock(a) *(a) = 0
#endif /* !RIOT_VERSION && !HAVE_PTHREAD_H && !HAVE_PTHREAD_MUTEX_LOCK */
#endif /* COAP_CONSTRAINED_STACK */
#endif /* COAP_MUTEX_H_ */