diff options
author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2019-10-28 04:14:52 +0200 |
---|---|---|
committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2019-10-28 17:11:40 +0200 |
commit | 66e7c5b774e288faa3a9b413861d6a77723db3ad (patch) | |
tree | f815ad41d84a2994bef141b4e8484cb939872219 /src/libcamera/include | |
parent | 448716d8f75185795d9b01164440d0753850a80a (diff) |
libcamera: Add Semaphore class
Add a general-purpose counting semaphore class.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Diffstat (limited to 'src/libcamera/include')
-rw-r--r-- | src/libcamera/include/meson.build | 1 | ||||
-rw-r--r-- | src/libcamera/include/semaphore.h | 34 |
2 files changed, 35 insertions, 0 deletions
diff --git a/src/libcamera/include/meson.build b/src/libcamera/include/meson.build index 2c74d29b..64c2155f 100644 --- a/src/libcamera/include/meson.build +++ b/src/libcamera/include/meson.build @@ -17,6 +17,7 @@ libcamera_headers = files([ 'message.h', 'pipeline_handler.h', 'process.h', + 'semaphore.h', 'thread.h', 'utils.h', 'v4l2_controls.h', diff --git a/src/libcamera/include/semaphore.h b/src/libcamera/include/semaphore.h new file mode 100644 index 00000000..c6b28653 --- /dev/null +++ b/src/libcamera/include/semaphore.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * Copyright (C) 2019, Google Inc. + * + * semaphore.h - General-purpose counting semaphore + */ +#ifndef __LIBCAMERA_SEMAPHORE_H__ +#define __LIBCAMERA_SEMAPHORE_H__ + +#include <condition_variable> + +#include "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_SEMAPHORE_H__ */ |