forked from Archive/PX4-Autopilot
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
/****************************************************************************
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*
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* Copyright (c) 2016 PX4 Development Team. 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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* 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 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/**
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* @file sem.hpp
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*
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* C++ synchronization helpers
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*/
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#pragma once
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#include "sem.h"
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/**
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* @class Smart locking object that uses a semaphore. It automatically
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* takes the lock when created and releases the lock when the object goes out of
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* scope. Use like this:
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*
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* px4_sem_t my_lock;
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* int ret = px4_sem_init(&my_lock, 0, 1);
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* ...
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*
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* {
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* SmartLock smart_lock(my_lock);
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* //critical section start
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* ...
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* //critical section end
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* }
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*/
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class SmartLock
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{
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public:
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SmartLock(px4_sem_t &sem) : _sem(sem) { do {} while (px4_sem_wait(&_sem) != 0); }
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~SmartLock() { px4_sem_post(&_sem); }
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private:
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px4_sem_t &_sem;
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};
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