Merge pull request #221 from g-oikonomou/contrib/mutex
Memory barriers, critical sections and mutexes
This commit is contained in:
commit
34f598002f
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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
|
||||||
|
* are met:
|
||||||
|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its
|
||||||
|
* contributors may be used to endorse or promote products derived
|
||||||
|
* from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||||
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||||
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||||
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||||
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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||||||
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||||
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||||
|
* 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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#ifndef MEMORY_BARRIER_CORTEX_H_
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#define MEMORY_BARRIER_CORTEX_H_
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#ifdef CMSIS_CONF_HEADER_PATH
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#include CMSIS_CONF_HEADER_PATH
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#endif
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/*---------------------------------------------------------------------------*/
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#define memory_barrier() __DMB()
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/*---------------------------------------------------------------------------*/
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#endif /* MEMORY_BARRIER_CORTEX_H_ */
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/*---------------------------------------------------------------------------*/
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@ -0,0 +1,82 @@
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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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*
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||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions
|
||||||
|
* are met:
|
||||||
|
*
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||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its
|
||||||
|
* contributors may be used to endorse or promote products derived
|
||||||
|
* from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||||
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||||
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||||
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||||
|
* 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,
|
||||||
|
* 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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||||||
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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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/**
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* \addtogroup arm
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*
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* Arm Cortex-M implementation of mutexes using the LDREX, STREX and DMB
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* instructions.
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*
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* @{
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*/
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/*---------------------------------------------------------------------------*/
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#ifndef MUTEX_CORTEX_H_
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#define MUTEX_CORTEX_H_
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#ifdef CMSIS_CONF_HEADER_PATH
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#include CMSIS_CONF_HEADER_PATH
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#endif
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#include <stdint.h>
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#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
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#define mutex_try_lock(m) mutex_cortex_try_lock(m)
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#define mutex_unlock(m) mutex_cortex_unlock(m)
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/*---------------------------------------------------------------------------*/
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#define MUTEX_CONF_HAS_MUTEX_T 1
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typedef uint8_t mutex_t;
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/*---------------------------------------------------------------------------*/
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static inline bool
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mutex_cortex_try_lock(volatile mutex_t *mutex)
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{
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int status = 1;
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if(__LDREXB(mutex) == 0) {
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status = __STREXB(1, mutex);
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}
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__DMB();
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return status == 0 ? true : false;
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}
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/*---------------------------------------------------------------------------*/
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static inline void
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mutex_cortex_unlock(volatile mutex_t *mutex)
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{
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__DMB();
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*mutex = 0;
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}
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/*---------------------------------------------------------------------------*/
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#endif /* MUTEX_CORTEX_H_ */
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/*---------------------------------------------------------------------------*/
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/** @} */
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@ -58,5 +58,12 @@
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#define TSCH_CONF_HW_FRAME_FILTERING 0
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#define TSCH_CONF_HW_FRAME_FILTERING 0
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#endif /* MAC_CONF_WITH_TSCH */
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#endif /* MAC_CONF_WITH_TSCH */
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* Path to CMSIS header */
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#define CMSIS_CONF_HEADER_PATH "cc2538_cm3.h"
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/* Path to headers with implementation of mutexes and memory barriers */
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#define MUTEX_CONF_ARCH_HEADER_PATH "mutex-cortex.h"
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#define MEMORY_BARRIER_CONF_ARCH_HEADER_PATH "memory-barrier-cortex.h"
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/*---------------------------------------------------------------------------*/
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#endif /* CC2538_DEF_H_ */
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#endif /* CC2538_DEF_H_ */
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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@ -93,5 +93,12 @@
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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#define RTIMER_ARCH_SECOND 65536
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#define RTIMER_ARCH_SECOND 65536
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* Path to CMSIS header */
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#define CMSIS_CONF_HEADER_PATH "cc13x0-cc26x0-cm3.h"
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/* Path to headers with implementation of mutexes and memory barriers */
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#define MUTEX_CONF_ARCH_HEADER_PATH "mutex-cortex.h"
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#define MEMORY_BARRIER_CONF_ARCH_HEADER_PATH "memory-barrier-cortex.h"
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/*---------------------------------------------------------------------------*/
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#endif /* CC13XX_CC26XX_DEF_H_ */
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#endif /* CC13XX_CC26XX_DEF_H_ */
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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@ -106,6 +106,8 @@ void *w_memset(void *out, int value, size_t n);
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#endif /* memcpy */
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#endif /* memcpy */
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#endif /* __GNUC__ && __MSP430__ && MSP430_MEMCPY_WORKAROUND */
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#endif /* __GNUC__ && __MSP430__ && MSP430_MEMCPY_WORKAROUND */
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#define memory_barrier() asm volatile("" : : : "memory")
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#define MSP430_REQUIRE_CPUON 0
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#define MSP430_REQUIRE_CPUON 0
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#define MSP430_REQUIRE_LPM1 1
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#define MSP430_REQUIRE_LPM1 1
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#define MSP430_REQUIRE_LPM2 2
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#define MSP430_REQUIRE_LPM2 2
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@ -0,0 +1,92 @@
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/*
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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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||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions
|
||||||
|
* are met:
|
||||||
|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its
|
||||||
|
* contributors may be used to endorse or promote products derived
|
||||||
|
* from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||||
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||||
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||||
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||||
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||||
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||||
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||||
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
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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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||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
/**
|
||||||
|
* \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
|
||||||
|
* provided to this function will be a value previously retrieved through a
|
||||||
|
* 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);
|
||||||
|
}
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#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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* @}
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|
*/
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@ -0,0 +1,67 @@
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||||||
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/*
|
||||||
|
* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions
|
||||||
|
* are met:
|
||||||
|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its
|
||||||
|
* contributors may be used to endorse or promote products derived
|
||||||
|
* from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||||
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||||
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||||
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||||
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||||
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||||
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||||
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
/**
|
||||||
|
* \addtogroup sys
|
||||||
|
* @{
|
||||||
|
*
|
||||||
|
* \defgroup memory-barrier CPU/Compiler memory barriers
|
||||||
|
* @{
|
||||||
|
*
|
||||||
|
* API for CPU/Compiler memory barriers
|
||||||
|
*/
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#ifndef MEMORY_BARRIER_H_
|
||||||
|
#define MEMORY_BARRIER_H_
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#include "contiki.h"
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#ifdef MEMORY_BARRIER_CONF_ARCH_HEADER_PATH
|
||||||
|
#include MEMORY_BARRIER_CONF_ARCH_HEADER_PATH
|
||||||
|
#endif /* MEMORY_BARRIER_CONF_ARCH_HEADER_PATH */
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#ifndef memory_barrier
|
||||||
|
/**
|
||||||
|
* \brief Insert a memory barrier
|
||||||
|
*
|
||||||
|
* It is the platform/CPU developer's responsibility to expand this macro to
|
||||||
|
* a function that creates a memory barrier. Calling this macro will otherwise
|
||||||
|
* not generate any code.
|
||||||
|
*/
|
||||||
|
#define memory_barrier()
|
||||||
|
#endif
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#endif /* MEMORY_BARRIER_H_ */
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
/**
|
||||||
|
* @}
|
||||||
|
* @}
|
||||||
|
*/
|
|
@ -0,0 +1,70 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions
|
||||||
|
* are met:
|
||||||
|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its
|
||||||
|
* contributors may be used to endorse or promote products derived
|
||||||
|
* from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||||
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||||
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||||
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||||
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||||
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||||
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||||
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
/**
|
||||||
|
* \addtogroup mutex
|
||||||
|
* @{
|
||||||
|
*/
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#include "contiki.h"
|
||||||
|
#include "sys/mutex.h"
|
||||||
|
#include "sys/critical.h"
|
||||||
|
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <stdbool.h>
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
bool
|
||||||
|
mutex_generic_try_lock(volatile mutex_t *mutex)
|
||||||
|
{
|
||||||
|
bool success = false;
|
||||||
|
int_master_status_t status = critical_enter();
|
||||||
|
|
||||||
|
if(*mutex == MUTEX_STATUS_UNLOCKED) {
|
||||||
|
*mutex = MUTEX_STATUS_LOCKED;
|
||||||
|
success = true;
|
||||||
|
}
|
||||||
|
|
||||||
|
critical_exit(status);
|
||||||
|
|
||||||
|
return success;
|
||||||
|
}
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
void
|
||||||
|
mutex_generic_unlock(volatile mutex_t *mutex)
|
||||||
|
{
|
||||||
|
int_master_status_t status = critical_enter();
|
||||||
|
|
||||||
|
*mutex = MUTEX_STATUS_UNLOCKED;
|
||||||
|
|
||||||
|
critical_exit(status);
|
||||||
|
}
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
/** @} */
|
|
@ -0,0 +1,129 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions
|
||||||
|
* are met:
|
||||||
|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its
|
||||||
|
* contributors may be used to endorse or promote products derived
|
||||||
|
* from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||||
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||||
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||||
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||||
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||||
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||||
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||||
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
/**
|
||||||
|
* \addtogroup sys
|
||||||
|
* @{
|
||||||
|
*
|
||||||
|
* \defgroup mutex Mutexes
|
||||||
|
* @{
|
||||||
|
*
|
||||||
|
* This library provides an API and generic implementation of mutexes.
|
||||||
|
*
|
||||||
|
* Calling code should manipulate mutexes through the mutex_try_lock() and
|
||||||
|
* mutex_unlock() macros. By default, those macros will expand to the generic
|
||||||
|
* mutex manipulation implementations provided here. While these will work,
|
||||||
|
* they do reply on disabling the master interrupt in order to perform the
|
||||||
|
* lock/unlock operation.
|
||||||
|
*
|
||||||
|
* It is possible to override those generic implementation with CPU-specific
|
||||||
|
* implementations that exploit synchronisation instructions. To do so,
|
||||||
|
* create a CPU-specific header file. In this file, define mutex_try_lock()
|
||||||
|
* and mutex_unlock() to expand to the respective CPU function names. These
|
||||||
|
* can (but do not have to) be inlined. Then define MUTEX_CONF_ARCH_HEADER_PATH
|
||||||
|
* as this header's filename.
|
||||||
|
*/
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#ifndef MUTEX_H_
|
||||||
|
#define MUTEX_H_
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#include "contiki.h"
|
||||||
|
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <stdbool.h>
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#define MUTEX_STATUS_LOCKED 1 /** The mutex is locked */
|
||||||
|
#define MUTEX_STATUS_UNLOCKED 0 /** The mutex is not locked */
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#ifdef MUTEX_CONF_ARCH_HEADER_PATH
|
||||||
|
#include MUTEX_CONF_ARCH_HEADER_PATH
|
||||||
|
#endif /* MUTEX_CONF_ARCH_HEADER_PATH */
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#if !MUTEX_CONF_HAS_MUTEX_T
|
||||||
|
/**
|
||||||
|
* \brief Mutex data type
|
||||||
|
*
|
||||||
|
* It is possible for the platform to override this with its own typedef. In
|
||||||
|
* this scenario, make sure to also define MUTEX_CONF_HAS_MUTEX_T as 1.
|
||||||
|
*/
|
||||||
|
typedef uint_fast8_t mutex_t;
|
||||||
|
#endif
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#ifndef mutex_try_lock
|
||||||
|
/**
|
||||||
|
* \brief Try to lock a mutex
|
||||||
|
* \param m A pointer to the mutex to be locked
|
||||||
|
* \retval true Locking succeeded
|
||||||
|
* \retval false Locking failed (the mutex is already locked)
|
||||||
|
*
|
||||||
|
* This macro will expand to mutex_generic_try_lock() or to a CPU-provided
|
||||||
|
* implementation. Platform-independent code should use this macro instead
|
||||||
|
* of mutex_generic_try_lock().
|
||||||
|
*/
|
||||||
|
#define mutex_try_lock(m) mutex_generic_try_lock(m)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifndef mutex_unlock
|
||||||
|
/**
|
||||||
|
* \brief Unlock a previously acquired mutex
|
||||||
|
* \param m A pointer to the mutex to be unlocked
|
||||||
|
*
|
||||||
|
* This macro will expand to mutex_generic_unlock() or to a CPU-provided
|
||||||
|
* implementation. Platform-independent code should use this macro instead
|
||||||
|
* of mutex_generic_unlock().
|
||||||
|
*/
|
||||||
|
#define mutex_unlock(m) mutex_generic_unlock(m)
|
||||||
|
#endif
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
/**
|
||||||
|
* \brief Try to lock a mutex
|
||||||
|
* \param mutex A pointer to the mutex to be locked
|
||||||
|
* \retval true Locking succeeded
|
||||||
|
* \retval false Locking failed (the mutex is already locked)
|
||||||
|
*
|
||||||
|
* Do not call this function directly. Use the mutex_try_lock() macro instead.
|
||||||
|
*/
|
||||||
|
bool mutex_generic_try_lock(volatile mutex_t *mutex);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* \brief Unlock a previously acquired mutex
|
||||||
|
* \param mutex A pointer to the mutex to be unlocked
|
||||||
|
*
|
||||||
|
* Do not call this function directly. Use the mutex_unlock() macro instead.
|
||||||
|
*/
|
||||||
|
void mutex_generic_unlock(volatile mutex_t *mutex);
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
#endif /* MUTEX_H_ */
|
||||||
|
/*---------------------------------------------------------------------------*/
|
||||||
|
/**
|
||||||
|
* @}
|
||||||
|
* @}
|
||||||
|
*/
|
Loading…
Reference in New Issue