[Bf-blender-cvs] [e93663363ea] master: Fix T77734: random crash when rendering animation

[Vincent Blankfield]

Commit: e93663363ea11e2baa7518498abae3073b48a8b4
Author: Vincent Blankfield
Date:   Tue Jun 30 14:43:00 2020 +0200
Branches: master
https://developer.blender.org/rBe93663363ea11e2baa7518498abae3073b48a8b4

Fix T77734: random crash when rendering animation

Differential Revision: https://developer.blender.org/D7986

===================================================================

M	source/blender/render/intern/source/external_engine.c

===================================================================

diff --git a/source/blender/render/intern/source/external_engine.c b/source/blender/render/intern/source/external_engine.c
index af3a6fdd384..5391775cab8 100644
--- a/source/blender/render/intern/source/external_engine.c
+++ b/source/blender/render/intern/source/external_engine.c
@@ -838,9 +838,11 @@ int RE_engine_render(Render *re, int do_all)
   engine->resolution_x = re->winx;
   engine->resolution_y = re->winy;
 
+  BLI_rw_mutex_lock(&re->partsmutex, THREAD_LOCK_WRITE);
   RE_parts_init(re);
   engine->tile_x = re->partx;
   engine->tile_y = re->party;
+  BLI_rw_mutex_unlock(&re->partsmutex);
 
   if (re->result->do_exr_tile) {
     render_result_exr_file_begin(re, engine);