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https://github.com/obgm/libcoap.git
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Jon Shallow
cb18375df7
When there is a limited stack size, having large data items on the stack can easily cause stack overflows. This makes integration with any constrained stack O/S a lot easier. include/coap2/coap_mutex.h: Create coap_ mutex functions which are platform independent to protect the (now) static variables if compiled with "-DCOAP_CONSTRAINED_STACK=1" Makefile.am: Include include/coap2/coap_mutex.h for distribution coap_config.h.contiki: coap_config.h.lwip: As CONTIKI and LWIP have constrained stacks, set "#define COAP_CONSTRAINED_STACK 1" src/coap_debug.c: src/coap_io.c: src/net.c: coap_show_pdu() coap_log_impl() coap_run_once() coap_read_session() coap_read_endpoint() Move large data items out of the functions' stack and make them static variables (defined within the function) if COAP_CONSTRAINED_STACK is defined. Protect the usage of these static variables by mutexes. Note: if "-DCOAP_CONSTRAINED_STACK=0" is used, then the stack will not be constrained.
51 lines
1.2 KiB
C
51 lines
1.2 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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*
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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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#if defined(RIOT_VERSION)
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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_CONTIKI)
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/* CONTIKI does not support mutex */
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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 /* ! RIOT_VERSION && ! WITH_CONTIKI */
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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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#endif /* ! RIOT_VERSION && ! WITH_CONTIKI */
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#endif /* COAP_MUTEX_H_ */
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