libcamera: thread: Support dispatching messages to main thread

Threads contain message queues and dispatch queued messages in their
event loop, in Thread::exec(). This mechanism prevents the main thread
from dispatching messages as it doesn't run Thread::exec().

Fix this by moving message dispatching from Thread::exec() to
EventDispatcher::processEvents().

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

1 files changed, 1 insertions, 3 deletions

diff --git a/src/libcamera/thread.cpp b/src/libcamera/thread.cpp
index 6f86e4a9..24422f7b 100644
--- a/src/libcamera/thread.cpp
+++ b/src/libcamera/thread.cpp
@@ -212,10 +212,8 @@ int Thread::exec()
 
 	locker.unlock();
 
-	while (!data_->exit_.load(std::memory_order_acquire)) {
-		dispatchMessages();
+	while (!data_->exit_.load(std::memory_order_acquire))
 		dispatcher->processEvents();
-	}
 
 	locker.lock();