From: Christian Hergert <christian@hergert.me>
Date: Sun, 30 Jan 2022 01:05:48 +0000 (-0800)
Subject: macos: push to head of awaiting frames
X-Git-Tag: archive/raspbian/4.6.5+ds-1+rpi1~1^2~19^2~4^2~22^2~13
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=519a44d2242c281fb8fd58dbc65456a53428d07d;p=gtk4.git

macos: push to head of awaiting frames

Always add to the head of awaiting frames as the list is processed
in the opposite direction.
---

diff --git a/gdk/macos/gdkmacosdisplay.c b/gdk/macos/gdkmacosdisplay.c
index 051a921903..9507d65c88 100644
--- a/gdk/macos/gdkmacosdisplay.c
+++ b/gdk/macos/gdkmacosdisplay.c
@@ -987,7 +987,11 @@ _gdk_macos_display_add_frame_callback (GdkMacosDisplay *self,
 
   if (!queue_contains (&self->awaiting_frames, &surface->frame))
     {
-      g_queue_push_tail_link (&self->awaiting_frames, &surface->frame);
+      /* Processing frames is always head to tail, so push to the
+       * head so that we don't possibly re-enter this right after
+       * adding to the queue.
+       */
+      g_queue_push_head_link (&self->awaiting_frames, &surface->frame);
 
       if (self->awaiting_frames.length == 1)
         gdk_display_link_source_unpause ((GdkDisplayLinkSource *)self->frame_source);