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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* General-purpose counting semaphore
*/
#pragma once
#include <libcamera/base/private.h>
#include <libcamera/base/mutex.h>
namespace libcamera {
class Semaphore
{
public:
Semaphore(unsigned int n = 0);
unsigned int available() LIBCAMERA_TSA_EXCLUDES(mutex_);
void acquire(unsigned int n = 1) LIBCAMERA_TSA_EXCLUDES(mutex_);
bool tryAcquire(unsigned int n = 1) LIBCAMERA_TSA_EXCLUDES(mutex_);
void release(unsigned int n = 1) LIBCAMERA_TSA_EXCLUDES(mutex_);
private:
Mutex mutex_;
ConditionVariable cv_;
unsigned int available_ LIBCAMERA_TSA_GUARDED_BY(mutex_);
};
} /* namespace libcamera */
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