diff options
| -rw-r--r-- | include/libcamera/camera.h | 5 | ||||
| -rw-r--r-- | src/libcamera/camera.cpp | 39 |
2 files changed, 43 insertions, 1 deletions
diff --git a/include/libcamera/camera.h b/include/libcamera/camera.h index 5ad8a09f..a2635402 100644 --- a/include/libcamera/camera.h +++ b/include/libcamera/camera.h @@ -29,6 +29,9 @@ public: Signal<Camera *> disconnected; + int acquire(); + void release(); + private: Camera(PipelineHandler *pipe, const std::string &name); ~Camera(); @@ -38,6 +41,8 @@ private: std::shared_ptr<PipelineHandler> pipe_; std::string name_; + + bool acquired_; }; } /* namespace libcamera */ diff --git a/src/libcamera/camera.cpp b/src/libcamera/camera.cpp index 9cec2892..500976b2 100644 --- a/src/libcamera/camera.cpp +++ b/src/libcamera/camera.cpp @@ -102,12 +102,14 @@ const std::string &Camera::name() const */ Camera::Camera(PipelineHandler *pipe, const std::string &name) - : pipe_(pipe->shared_from_this()), name_(name) + : pipe_(pipe->shared_from_this()), name_(name), acquired_(false) { } Camera::~Camera() { + if (acquired_) + LOG(Camera, Error) << "Removing camera while still in use"; } /** @@ -127,4 +129,39 @@ void Camera::disconnect() disconnected.emit(this); } +/** + * \brief Acquire the camera device for exclusive access + * + * After opening the device with open(), exclusive access must be obtained + * before performing operations that change the device state. This function is + * not blocking, if the device has already been acquired (by the same or another + * process) the -EBUSY error code is returned. + * + * Once exclusive access isn't needed anymore, the device should be released + * with a call to the release() function. + * + * \todo Implement exclusive access across processes. + * + * \return 0 on success or a negative error code on error. + */ +int Camera::acquire() +{ + if (acquired_) + return -EBUSY; + + acquired_ = true; + return 0; +} + +/** + * \brief Release exclusive access to the camera device + * + * Releasing the camera device allows other users to acquire exclusive access + * with the acquire() function. + */ +void Camera::release() +{ + acquired_ = false; +} + } /* namespace libcamera */ |