cam: event_loop: Add deferred calls support

Add a deferred cals queue to the EventLoop class to support queuing
calls from a different thread and processing them in the event loop's
thread.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/src/cam/event_loop.h b/src/cam/event_loop.h
index b1c6bd10..408073c5 100644
--- a/src/cam/event_loop.h
+++ b/src/cam/event_loop.h
@@ -8,6 +8,9 @@
 #define __CAM_EVENT_LOOP_H__
 
 #include <atomic>
+#include <functional>
+#include <list>
+#include <mutex>
 
 struct event_base;
 
@@ -22,6 +25,8 @@ public:
 	int exec();
 	void exit(int code = 0);
 
+	void callLater(const std::function<void()> &func);
+
 private:
 	static EventLoop *instance_;
 
@@ -29,7 +34,11 @@ private:
 	std::atomic<bool> exit_;
 	int exitCode_;
 
+	std::list<std::function<void()>> calls_;
+	std::mutex lock_;
+
 	void interrupt();
+	void dispatchCalls();
 };
 
 #endif /* __CAM_EVENT_LOOP_H__ */