Fix race condition between tracking thread and tracks map sync

This might have been a reason of bug T38281.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/blenkernel/tracking_private.h b/source/blender/blenkernel/tracking_private.h
index 3245fe5fbd5..981b7951097 100644
--- a/source/blender/blenkernel/tracking_private.h
+++ b/source/blender/blenkernel/tracking_private.h
@@ -35,6 +35,8 @@
 #ifndef __TRACKING_PRIVATE_H__
 #define __TRACKING_PRIVATE_H__
 
+#include "BLI_threads.h"
+
 struct GHash;
 struct MovieTracking;
 struct MovieTrackingMarker;
@@ -54,6 +56,9 @@ typedef struct TracksMap {
 	struct GHash *hash;
 
 	int ptr;
+
+	/* Spin lock is used to sync context during tracking. */
+	SpinLock spin_lock;
 } TracksMap;
 
 struct TracksMap *tracks_map_new(const char *object_name, bool is_camera, int num_tracks, int customdata_size);