From 29136a018694b23d838f23afd852530cd3527bf0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Mon, 4 Jan 2016 17:18:07 +0200
Subject: [PATCH] netclientclock: Destroy a cached clock 60 seconds after its
 last use

There's not much lost by having the clock idle around a bit longer but it will
potentially allow anybody wanting to use the same clock server again to sync
much faster.
---
 libs/gst/net/gstnetclientclock.c | 35 +++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/libs/gst/net/gstnetclientclock.c b/libs/gst/net/gstnetclientclock.c
index 873b739eaf..4cdd9a8d3b 100644
--- a/libs/gst/net/gstnetclientclock.c
+++ b/libs/gst/net/gstnetclientclock.c
@@ -73,6 +73,8 @@ typedef struct
   GstClock *clock;              /* GstNetClientInternalClock */
 
   GList *clocks;                /* GstNetClientClocks */
+
+  GstClockID remove_id;
 } ClockCache;
 
 G_LOCK_DEFINE_STATIC (clocks_lock);
@@ -1102,6 +1104,24 @@ update_clock_cache (ClockCache * cache)
   GST_OBJECT_UNLOCK (cache->clock);
 }
 
+static gboolean
+remove_clock_cache (GstClock * clock, GstClockTime time, GstClockID id,
+    gpointer user_data)
+{
+  ClockCache *cache = user_data;
+
+  G_LOCK (clocks_lock);
+  if (!cache->clocks) {
+    gst_clock_id_unref (cache->remove_id);
+    gst_object_unref (cache->clock);
+    g_free (cache);
+    clocks = g_list_remove (clocks, cache);
+  }
+  G_UNLOCK (clocks_lock);
+
+  return TRUE;
+}
+
 static void
 gst_net_client_clock_finalize (GObject * object)
 {
@@ -1122,9 +1142,13 @@ gst_net_client_clock_finalize (GObject * object)
       if (cache->clocks) {
         update_clock_cache (cache);
       } else {
-        gst_object_unref (cache->clock);
-        g_free (cache);
-        clocks = g_list_remove (clocks, cache);
+        GstClock *sysclock = gst_system_clock_obtain ();
+        GstClockTime time = gst_clock_get_time (sysclock) + 60 * GST_SECOND;
+
+        cache->remove_id = gst_clock_new_single_shot_id (sysclock, time);
+        gst_clock_id_wait_async (cache->remove_id, remove_clock_cache, cache,
+            NULL);
+        gst_object_unref (sysclock);
       }
       break;
     }
@@ -1275,6 +1299,11 @@ gst_net_client_clock_constructed (GObject * object)
     if (strcmp (internal_clock->address, self->priv->address) == 0 &&
         internal_clock->port == self->priv->port) {
       cache = tmp;
+
+      if (cache->remove_id) {
+        gst_clock_id_unschedule (cache->remove_id);
+        cache->remove_id = NULL;
+      }
       break;
     }
   }