From ccc17ebe104d009ca9fe66bb59609ec1afa372d5 Mon Sep 17 00:00:00 2001
From: Matthew Waters <matthew@centricular.com>
Date: Wed, 13 Jan 2016 13:17:56 +1100
Subject: [PATCH] glimagesink: don't push a reconfigure event from the GL
 thread

Doing so may cause deadlocks when other elements attempt destroy or created
GL resources.

https://bugzilla.gnome.org/show_bug.cgi?id=760559
---
 ext/gl/gstglimagesink.c | 26 +++++++++++++++++++-------
 ext/gl/gstglimagesink.h |  3 ++-
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/ext/gl/gstglimagesink.c b/ext/gl/gstglimagesink.c
index 0795170..2e5a603 100644
--- a/ext/gl/gstglimagesink.c
+++ b/ext/gl/gstglimagesink.c
@@ -1474,6 +1474,15 @@ gst_glimage_sink_prepare (GstBaseSink * bsink, GstBuffer * buf)
     gst_gl_sync_meta_wait (sync_meta, glimage_sink->context);
 
   GST_GLIMAGE_SINK_LOCK (glimage_sink);
+  if (glimage_sink->window_resized) {
+    glimage_sink->window_resized = FALSE;
+    GST_GLIMAGE_SINK_UNLOCK (glimage_sink);
+    GST_DEBUG_OBJECT (glimage_sink, "Sending reconfigure event on sinkpad.");
+    gst_pad_push_event (GST_BASE_SINK (glimage_sink)->sinkpad,
+        gst_event_new_reconfigure ());
+    GST_GLIMAGE_SINK_LOCK (glimage_sink);
+  }
+
   target = &glimage_sink->input_buffer;
   if (GST_VIDEO_INFO_MULTIVIEW_MODE (&glimage_sink->in_info) ==
       GST_VIDEO_MULTIVIEW_MODE_FRAME_BY_FRAME &&
@@ -1885,7 +1894,7 @@ gst_glimage_sink_on_resize (GstGLImageSink * gl_sink, gint width, gint height)
   height = MAX (1, height);
 
   /* Check if we would suggest a different width/height now */
-  reconfigure = ((gl_sink->window_width != width)
+  gl_sink->window_resized = ((gl_sink->window_width != width)
       || (gl_sink->window_height != height))
       && (gl_sink->window_width != 0)
       && (gl_sink->window_height != 0);
@@ -1893,12 +1902,6 @@ gst_glimage_sink_on_resize (GstGLImageSink * gl_sink, gint width, gint height)
   gl_sink->window_width = width;
   gl_sink->window_height = height;
 
-  if (reconfigure) {
-    GST_DEBUG ("Sending reconfigure event on sinkpad.");
-    gst_pad_push_event (GST_BASE_SINK (gl_sink)->sinkpad,
-        gst_event_new_reconfigure ());
-  }
-
   gst_gl_insert_debug_marker (gl_sink->context, "%s window resize to %ix%i",
       GST_OBJECT_NAME (gl_sink), width, height);
 
@@ -2119,6 +2122,15 @@ gst_glimage_sink_redisplay (GstGLImageSink * gl_sink)
 
     /* Recreate the output texture if needed */
     GST_GLIMAGE_SINK_LOCK (gl_sink);
+    if (gl_sink->window_resized) {
+      gl_sink->window_resized = FALSE;
+      GST_GLIMAGE_SINK_UNLOCK (gl_sink);
+      GST_DEBUG_OBJECT (gl_sink, "Sending reconfigure event on sinkpad.");
+      gst_pad_push_event (GST_BASE_SINK (gl_sink)->sinkpad,
+          gst_event_new_reconfigure ());
+      GST_GLIMAGE_SINK_LOCK (gl_sink);
+    }
+
     if (gl_sink->output_mode_changed && gl_sink->input_buffer != NULL) {
       GST_DEBUG ("Recreating output after mode/size change");
       update_output_format (gl_sink);
diff --git a/ext/gl/gstglimagesink.h b/ext/gl/gstglimagesink.h
index 8f9b2e6..6e9b98e 100644
--- a/ext/gl/gstglimagesink.h
+++ b/ext/gl/gstglimagesink.h
@@ -102,7 +102,8 @@ struct _GstGLImageSink
     GstGLSyncMeta *stored_sync_meta;
     GLuint redisplay_texture;
 
-    gboolean caps_change;
+    /* protected with drawing_lock */
+    gboolean window_resized;
     guint window_width;
     guint window_height;
 
-- 
2.7.4