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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* semaphore.h - General-purpose counting semaphore
*/
#ifndef __LIBCAMERA_INTERNAL_SEMAPHORE_H__
#define __LIBCAMERA_INTERNAL_SEMAPHORE_H__
#include <condition_variable>
#include "libcamera/internal/thread.h"
namespace libcamera {
class Semaphore
{
public:
Semaphore(unsigned int n = 0);
unsigned int available();
void acquire(unsigned int n = 1);
bool tryAcquire(unsigned int n = 1);
void release(unsigned int n = 1);
private:
Mutex mutex_;
std::condition_variable cv_;
unsigned int available_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_INTERNAL_SEMAPHORE_H__ */
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