From 308540c2fea54acc9b152e67252812fc530a9768 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Qian=20Hu=20=28=E8=83=A1=E9=AA=9E=29?=
 <qian.hu@mediatek.com>
Date: Mon, 24 Feb 2025 09:43:12 +0800
Subject: [PATCH] wayland: add synchronized object destruction function

Introduces a new generic destruction function
gst_wl_display_object_destroy that ensures all
destruction operations are protected by
sync_mutex.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8242>
---
 .../gst-libs/gst/wayland/gstwldisplay.c       | 22 +++++++++++++++++++
 .../gst-libs/gst/wayland/gstwldisplay.h       |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwldisplay.c b/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwldisplay.c
index edae01de8b..5142d3ad4b 100644
--- a/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwldisplay.c
+++ b/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwldisplay.c
@@ -558,6 +558,28 @@ gst_wl_display_sync (GstWlDisplay * self,
   return callback;
 }
 
+/* gst_wl_display_object_destroy
+ *
+ * A syncronized version of `xxx_destroy` that ensures that the
+ * once this function returns, the destroy_func will either have already completed,
+ * or will never be called.
+ */
+void
+gst_wl_display_object_destroy (GstWlDisplay * self,
+    gpointer * object, GDestroyNotify destroy_func)
+{
+  GstWlDisplayPrivate *priv = gst_wl_display_get_instance_private (self);
+
+  g_rec_mutex_lock (&priv->sync_mutex);
+
+  if (*object) {
+    destroy_func (*object);
+    *object = NULL;
+  }
+
+  g_rec_mutex_unlock (&priv->sync_mutex);
+}
+
 /* gst_wl_display_callback_destroy
  *
  * A syncronized version of `wl_callback_destroy` that ensures that the
diff --git a/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwldisplay.h b/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwldisplay.h
index 485cf18ac8..b2f0ca35e8 100644
--- a/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwldisplay.h
+++ b/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwldisplay.h
@@ -56,6 +56,9 @@ GST_WL_API
 struct wl_callback * gst_wl_display_sync(GstWlDisplay * self, const struct wl_callback_listener *listener,
 	gpointer data);
 
+GST_WL_API
+void gst_wl_display_object_destroy (GstWlDisplay * self, gpointer *object, GDestroyNotify destroy_func);
+
 GST_WL_API
 void gst_wl_display_callback_destroy(GstWlDisplay * self, struct wl_callback ** callback);