57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/*
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* File : Semaphore.h
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2016, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2016/10/1 Bernard The first version
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*/
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#pragma once
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#include <stdint.h>
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#include <rtthread.h>
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namespace rtthread {
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/** The Semaphore class is used to manage and protect access to a set of shared resources. */
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class Semaphore
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{
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public:
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/** Create and Initialize a Semaphore object used for managing resources.
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@param number of available resources; maximum index value is (count-1).
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*/
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Semaphore(const char *name = "sem", int32_t count = 0);
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~Semaphore();
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/** Wait until a Semaphore resource becomes available.
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@param millisec timeout value or 0 in case of no time-out.
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@return true on success.
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*/
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bool wait(int32_t millisec = -1);
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/** Release a Semaphore resource that was obtain with Semaphore::wait.
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*/
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void release(void);
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private:
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struct rt_semaphore mID;
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};
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}
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