1 /* 2 * coap_mutex.h -- mutex utilities 3 * 4 * Copyright (C) 2019 Jon Shallow <supjps-libcoap@jpshallow.com> 5 * 2019 Olaf Bergmann <bergmann@tzi.org> 6 * 7 * SPDX-License-Identifier: BSD-2-Clause 8 * 9 * This file is part of the CoAP library libcoap. Please see README for terms 10 * of use. 11 */ 12 13 /** 14 * @file coap_mutex.h 15 * @brief COAP mutex mechanism wrapper 16 */ 17 18 #ifndef COAP_MUTEX_H_ 19 #define COAP_MUTEX_H_ 20 21 /* 22 * Mutexes are currently only used if there is a constrained stack, 23 * and large static variables (instead of the large variable being on 24 * the stack) need to be protected. 25 */ 26 #if COAP_CONSTRAINED_STACK 27 28 #if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK) 29 #include <pthread.h> 30 31 typedef pthread_mutex_t coap_mutex_t; 32 #define COAP_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER 33 #define coap_mutex_lock(a) pthread_mutex_lock(a) 34 #define coap_mutex_trylock(a) pthread_mutex_trylock(a) 35 #define coap_mutex_unlock(a) pthread_mutex_unlock(a) 36 37 #elif defined(RIOT_VERSION) 38 /* use RIOT's mutex API */ 39 #include <mutex.h> 40 41 typedef mutex_t coap_mutex_t; 42 #define COAP_MUTEX_INITIALIZER MUTEX_INIT 43 #define coap_mutex_lock(a) mutex_lock(a) 44 #define coap_mutex_trylock(a) mutex_trylock(a) 45 #define coap_mutex_unlock(a) mutex_unlock(a) 46 47 #else 48 /* define stub mutex functions */ 49 typedef int coap_mutex_t; 50 #define COAP_MUTEX_INITIALIZER 0 51 #define coap_mutex_lock(a) *(a) = 1 52 #define coap_mutex_trylock(a) *(a) = 1 53 #define coap_mutex_unlock(a) *(a) = 0 54 55 #endif /* !RIOT_VERSION && !HAVE_PTHREAD_H && !HAVE_PTHREAD_MUTEX_LOCK */ 56 57 #endif /* COAP_CONSTRAINED_STACK */ 58 59 #endif /* COAP_MUTEX_H_ */ 60