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/*
* Copyright (c) 2017-2018 Arm Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __ARM_COMPUTE_UTILS_SEMAMPHORE_H__
#define __ARM_COMPUTE_UTILS_SEMAMPHORE_H__
#include "Mutex.h"
#include "support/Mutex.h"
#include <condition_variable>
namespace arm_compute
{
#ifndef NO_MULTI_THREADING
/** Semamphore class */
class Semaphore
{
public:
/** Default Constuctor
*
* @param[in] value Semaphore initial value
*/
Semaphore(int value = 0)
: _value(value), _m(), _cv()
{
}
/** Signals a semaphore */
inline void signal()
{
{
std::lock_guard<std::mutex> lock(_m);
++_value;
}
_cv.notify_one();
}
/** Waits on a semaphore */
inline void wait()
{
std::unique_lock<std::mutex> lock(_m);
_cv.wait(lock, [this]()
{
return _value > 0;
});
--_value;
}
private:
int _value;
arm_compute::Mutex _m;
std::condition_variable _cv;
};
#else /* NO_MULTI_THREADING */
/** Empty semamphore class */
class Semaphore
{
public:
Semaphore(int value = 0)
: _value(value)
{
(void)_value;
}
/** Signals a semaphore */
inline void signal()
{
(void)_value;
}
/** Waits on a semaphore */
inline void wait()
{
(void)_value;
}
private:
int _value;
};
#endif /* NO_MULTI_THREADING */
} // arm_compute
#endif /* __ARM_COMPUTE_UTILS_SEMAMPHORE_H__ */
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