93 lines
3.6 KiB
C
93 lines
3.6 KiB
C
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/*
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* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup sys
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* @{
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*
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* \defgroup critical Critical sections
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* @{
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*
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* Platform-independent functions for critical section entry and exit
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*/
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/*---------------------------------------------------------------------------*/
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#ifndef CRITICAL_H_
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#define CRITICAL_H_
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "sys/memory-barrier.h"
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#include "sys/int-master.h"
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Enter a critical section
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* \return The status of the master interrupt before entering the critical
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*
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* This function will return the status of the master interrupt as it was
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* before entering the critical section.
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*
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* The semantics of the return value are entirely platform-specific. The
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* calling code should not try to determine whether the master interrupt was
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* previously enabled/disabled by interpreting the return value of this
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* function. The return value should only be used as an argument to
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* critical_exit().
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*/
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static inline int_master_status_t
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critical_enter()
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{
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int_master_status_t status = int_master_read_and_disable();
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memory_barrier();
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return status;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Exit a critical section and restore the master interrupt
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* \param status The new status of the master interrupt
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*
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* The semantics of \e status are platform-dependent. Normally, the argument
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* provided to this function will be a value previously retrieved through a
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* call to critical_enter().
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*/
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static inline void
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critical_exit(int_master_status_t status)
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{
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memory_barrier();
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int_master_status_set(status);
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}
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/*---------------------------------------------------------------------------*/
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#endif /* CRITICAL_H_ */
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/*---------------------------------------------------------------------------*/
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/**
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* @}
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* @}
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*/
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