e228c290c9
Headers which must not be exposed as part of the public libcamera API should include base/private.h. Any interface which includes the private.h header will only be able to build if the libcamera_private dependency is used (or the libcamera_base_private dependency directly). Build targets which are intended to use the private API's will use the libcamera_private to handle the automatic definition of the inclusion guard. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
36 lines
703 B
C++
36 lines
703 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_BASE_SEMAPHORE_H__
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#define __LIBCAMERA_BASE_SEMAPHORE_H__
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#include <condition_variable>
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#include <libcamera/base/private.h>
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#include <libcamera/base/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_BASE_SEMAPHORE_H__ */
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