mirror of
https://github.com/obgm/libcoap.git
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Jon Shallow
c68d1e9fe7
Both LwIP and Contike are single threaded at present, so no need for stub mutex function warnings
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*
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* coap_mutex.h -- mutex utilities
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*
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* Copyright (C) 2019-2022 Jon Shallow <supjps-libcoap@jpshallow.com>
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* 2019 Olaf Bergmann <bergmann@tzi.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* This file is part of the CoAP library libcoap. Please see README for terms
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* of use.
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*/
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/**
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* @file coap_mutex.h
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* @brief CoAP mutex mechanism wrapper
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*/
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#ifndef COAP_MUTEX_H_
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#define COAP_MUTEX_H_
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/*
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* Mutexes are currently only used if there is a constrained stack,
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* and large static variables (instead of the large variable being on
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* the stack) need to be protected.
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*/
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#if COAP_CONSTRAINED_STACK
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#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK)
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#include <pthread.h>
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typedef pthread_mutex_t coap_mutex_t;
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#define COAP_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
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#define coap_mutex_lock(a) pthread_mutex_lock(a)
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#define coap_mutex_trylock(a) pthread_mutex_trylock(a)
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#define coap_mutex_unlock(a) pthread_mutex_unlock(a)
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#elif defined(RIOT_VERSION)
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/* use RIOT's mutex API */
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#include <mutex.h>
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typedef mutex_t coap_mutex_t;
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#define COAP_MUTEX_INITIALIZER MUTEX_INIT
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#define coap_mutex_lock(a) mutex_lock(a)
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#define coap_mutex_trylock(a) mutex_trylock(a)
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#define coap_mutex_unlock(a) mutex_unlock(a)
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#elif defined(WITH_LWIP)
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/* Use LwIP's mutex API */
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#if NO_SYS
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/* Single threaded, no-op'd in lwip/sys.h */
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typedef int coap_mutex_t;
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#define COAP_MUTEX_INITIALIZER 0
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#define coap_mutex_lock(a) *(a) = 1
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#define coap_mutex_trylock(a) *(a) = 1
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#define coap_mutex_unlock(a) *(a) = 0
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#else /* !NO SYS */
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#error Need support for LwIP mutex
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#endif /* !NO SYS */
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#elif defined(WITH_CONTIKI)
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/* Contiki does not have a mutex API, used as single thread */
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typedef int coap_mutex_t;
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#define COAP_MUTEX_INITIALIZER 0
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#define coap_mutex_lock(a) *(a) = 1
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#define coap_mutex_trylock(a) *(a) = 1
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#define coap_mutex_unlock(a) *(a) = 0
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#else /* !WITH_CONTIKI && !WITH_LWIP && !RIOT_VERSION && !HAVE_PTHREAD_H && !HAVE_PTHREAD_MUTEX_LOCK */
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/* define stub mutex functions */
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#warning "stub mutex functions"
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typedef int coap_mutex_t;
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#define COAP_MUTEX_INITIALIZER 0
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#define coap_mutex_lock(a) *(a) = 1
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#define coap_mutex_trylock(a) *(a) = 1
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#define coap_mutex_unlock(a) *(a) = 0
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#endif /* !WITH_CONTIKI && !WITH_LWIP && !RIOT_VERSION && !HAVE_PTHREAD_H && !HAVE_PTHREAD_MUTEX_LOCK */
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#endif /* COAP_CONSTRAINED_STACK */
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#endif /* COAP_MUTEX_H_ */
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