66e7c5b774
Add a general-purpose counting semaphore class. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
35 lines
637 B
C++
35 lines
637 B
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* semaphore.h - General-purpose counting semaphore
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*/
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#ifndef __LIBCAMERA_SEMAPHORE_H__
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#define __LIBCAMERA_SEMAPHORE_H__
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#include <condition_variable>
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#include "thread.h"
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namespace libcamera {
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class Semaphore
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{
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public:
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Semaphore(unsigned int n = 0);
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unsigned int available();
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void acquire(unsigned int n = 1);
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bool tryAcquire(unsigned int n = 1);
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void release(unsigned int n = 1);
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private:
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Mutex mutex_;
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std::condition_variable cv_;
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unsigned int available_;
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};
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_SEMAPHORE_H__ */
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