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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* semaphore.h - General-purpose counting semaphore
*/
#pragma once
#include <libcamera/base/private.h>
#include <libcamera/base/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_;
ConditionVariable cv_;
unsigned int available_;
};
} /* namespace libcamera */
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