mirror of
https://github.com/obgm/libcoap.git
synced 2026-11-06 17:52:54 +03:00
Olaf Bergmann
abec5b8228
On systems that support pthread mutexes, stack usage can be minimized with the use of static variables. Concurrent access is protected on these systems with mutexes. Platforms that do not have pthread support must map the coap_mutex_* macros accordingly.
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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* coap_mutex.h -- mutex utilities
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*
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* Copyright (C) 2019 Jon Shallow <supjps-libcoap@jpshallow.com>
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* 2019 Olaf Bergmann <bergmann@tzi.org>
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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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#else
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/* define 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 /* !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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