drm_hwcomposer: limit maximum depth of frame worker queue
am: ff717ff5b0
Change-Id: I89614273f61428a5303586c0fd63bdc4a53e3e63
diff --git a/drmdisplaycompositor.cpp b/drmdisplaycompositor.cpp
index 92323b6..5da9152 100644
--- a/drmdisplaycompositor.cpp
+++ b/drmdisplaycompositor.cpp
@@ -191,6 +191,16 @@
void DrmDisplayCompositor::FrameWorker::QueueFrame(
std::unique_ptr<DrmDisplayComposition> composition, int status) {
Lock();
+
+ // Block queue if it gets too large. Otherwise composition will
+ // start stacking up and eat limited resources (file descriptors)
+ // allocated for these.
+ while (frame_queue_.size() >= DRM_DISPLAY_COMPOSITOR_MAX_QUEUE_DEPTH) {
+ Unlock();
+ sched_yield();
+ Lock();
+ }
+
FrameState frame;
frame.composition = std::move(composition);
frame.status = status;