From 52067673f1649e995881331b111f891e1a83e286 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Fri, 23 Mar 2018 16:33:11 +0100
Subject: [PATCH] Fix a thread race in QuickSyncEncoder. Found by GCC TSan.

---
 quicksync_encoder.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/quicksync_encoder.cpp b/quicksync_encoder.cpp
index 67e9668..8761d56 100644
--- a/quicksync_encoder.cpp
+++ b/quicksync_encoder.cpp
@@ -1875,8 +1875,11 @@ void QuickSyncEncoderImpl::encode_thread_func()
 
 			if (frame_type == FRAME_IDR) {
 				// Release any reference frames from the previous GOP.
-				for (const ReferenceFrame &frame : reference_frames) {
-					release_gl_surface(frame.display_number);
+				{
+					unique_lock<mutex> lock(storage_task_queue_mutex);
+					for (const ReferenceFrame &frame : reference_frames) {
+						release_gl_surface(frame.display_number);
+					}
 				}
 				reference_frames.clear();
 				current_ref_frame_num = 0;
-- 
2.39.2