libcamera: Add thread support

The new Thread class wraps std::thread in order to integrate it with the
Object, Signal and EventDispatcher classes. By default new threads run
an internal event loop, and their run() method can be overloaded to
provide a custom thread loop.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

1 files changed, 4 insertions, 11 deletions

diff --git a/src/libcamera/camera_manager.cpp b/src/libcamera/camera_manager.cpp
index 337496c2..2cf01423 100644
--- a/src/libcamera/camera_manager.cpp
+++ b/src/libcamera/camera_manager.cpp
@@ -14,6 +14,7 @@
 #include "event_dispatcher_poll.h"
 #include "log.h"
 #include "pipeline_handler.h"
+#include "thread.h"
 #include "utils.h"
 
 /**
@@ -56,7 +57,7 @@ LOG_DEFINE_CATEGORY(Camera)
  */
 
 CameraManager::CameraManager()
-	: enumerator_(nullptr), dispatcher_(nullptr)
+	: enumerator_(nullptr)
 {
 }
 
@@ -247,12 +248,7 @@ CameraManager *CameraManager::instance()
  */
 void CameraManager::setEventDispatcher(std::unique_ptr<EventDispatcher> dispatcher)
 {
-	if (dispatcher_) {
-		LOG(Camera, Warning) << "Event dispatcher is already set";
-		return;
-	}
-
-	dispatcher_ = std::move(dispatcher);
+	Thread::current()->setEventDispatcher(std::move(dispatcher));
 }
 
 /**
@@ -268,10 +264,7 @@ void CameraManager::setEventDispatcher(std::unique_ptr<EventDispatcher> dispatch
  */
 EventDispatcher *CameraManager::eventDispatcher()
 {
-	if (!dispatcher_)
-		dispatcher_ = utils::make_unique<EventDispatcherPoll>();
-
-	return dispatcher_.get();
+	return Thread::current()->eventDispatcher();
 }
 
 } /* namespace libcamera */