43 lines
1007 B
C
43 lines
1007 B
C
|
/*
|
||
|
|
* Copyright (c) 2006-2018, RT-Thread Development Team
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: Apache-2.0
|
||
|
|
*
|
||
|
|
* 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;
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|