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