From fe082cbe24a4bfd7131921d820df1b7689da7b66 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tim-Philipp=20M=C3=BCller?= <tim@centricular.net>
Date: Fri, 10 Aug 2012 09:19:25 +0100
Subject: [PATCH] netclientclock: simplify by using
 g_socket_condition_timed_wait()

No need to use a custom main context and custom timeout sources,
just use g_socket_condition_timed_wait() instead, which was added
for exactly this case.

Also seems to help with the unit test deadlocking with glib 2.33.x

https://bugzilla.gnome.org/show_bug.cgi?id=681575
---
 libs/gst/net/gstnetclientclock.c |  186 +++++++++++---------------------------
 1 file changed, 55 insertions(+), 131 deletions(-)

diff --git a/libs/gst/net/gstnetclientclock.c b/libs/gst/net/gstnetclientclock.c
index 691c414..de9db2b 100644
--- a/libs/gst/net/gstnetclientclock.c
+++ b/libs/gst/net/gstnetclientclock.c
@@ -248,70 +248,11 @@ bogus_observation:
   }
 }
 
-typedef struct
-{
-  GSource source;
-  GstNetClientClock *clock;
-  gboolean *p_timeout;
-} GstNetClientClockTimeoutSource;
-
-static gboolean
-gst_net_client_clock_timeout_source_prepare (GSource * s, gint * p_timeout)
-{
-  GstNetClientClockTimeoutSource *source = (GstNetClientClockTimeoutSource *) s;
-  GstClockTime expiration_time = source->clock->priv->timeout_expiration;
-  GstClockTime now = gst_util_get_timestamp ();
-
-  if (now >= expiration_time || (expiration_time - now) <= GST_MSECOND) {
-    *p_timeout = 0;
-    return TRUE;
-  }
-
-  *p_timeout = (expiration_time - now) / GST_MSECOND;
-  GST_TRACE_OBJECT (source->clock, "time out in %d ms please", *p_timeout);
-  return FALSE;
-}
-
-static gboolean
-gst_net_client_clock_timeout_source_check (GSource * s)
-{
-  GstNetClientClockTimeoutSource *source = (GstNetClientClockTimeoutSource *) s;
-
-  return (gst_util_get_timestamp () >= source->clock->priv->timeout_expiration);
-}
-
-static gboolean
-gst_net_client_clock_timeout_source_dispatch (GSource * s, GSourceFunc cb,
-    gpointer data)
-{
-  GstNetClientClockTimeoutSource *source = (GstNetClientClockTimeoutSource *) s;
-
-  GST_TRACE_OBJECT (source->clock, "timed out");
-  *source->p_timeout = TRUE;
-  return TRUE;
-}
-
-static gboolean
-gst_net_client_clock_socket_cb (GSocket * socket, GIOCondition condition,
-    gpointer user_data)
-{
-  GIOCondition *p_cond = user_data;
-
-  GST_TRACE ("socket %p I/O condition: 0x%02x", socket, condition);
-  *p_cond = condition;
-  return TRUE;
-}
-
 static gpointer
 gst_net_client_clock_thread (gpointer data)
 {
   GstNetClientClock *self = data;
   GstNetTimePacket *packet;
-  GMainContext *ctx;
-  GSourceFuncs funcs = { NULL, };
-  GSource *source;
-  GIOCondition cond;
-  gboolean timeout;
   GSocket *socket = self->priv->socket;
   GError *err = NULL;
   GstClock *clock = data;
@@ -321,99 +262,82 @@ gst_net_client_clock_thread (gpointer data)
   g_socket_set_blocking (socket, TRUE);
   g_socket_set_timeout (socket, 0);
 
-  ctx = g_main_context_new ();
-
-  source = g_socket_create_source (socket, G_IO_IN, self->priv->cancel);
-  g_source_set_name (source, "GStreamer net client clock thread socket");
-  g_source_set_callback (source, (GSourceFunc) gst_net_client_clock_socket_cb,
-      &cond, NULL);
-  g_source_attach (source, ctx);
-  g_source_unref (source);
-
-  /* GSocket only support second granularity for timeouts, so roll our own
-   * timeout source (so we don't have to create a new source whenever the
-   * timeout changes, as we would have to do with the default timeout source) */
-  funcs.prepare = gst_net_client_clock_timeout_source_prepare;
-  funcs.check = gst_net_client_clock_timeout_source_check;
-  funcs.dispatch = gst_net_client_clock_timeout_source_dispatch;
-  funcs.finalize = NULL;
-  source = g_source_new (&funcs, sizeof (GstNetClientClockTimeoutSource));
-  ((GstNetClientClockTimeoutSource *) source)->clock = self;
-  ((GstNetClientClockTimeoutSource *) source)->p_timeout = &timeout;
-  g_source_set_name (source, "GStreamer net client clock timeout");
-  g_source_attach (source, ctx);
-  g_source_unref (source);
-
   while (!g_cancellable_is_cancelled (self->priv->cancel)) {
-    cond = 0;
-    timeout = FALSE;
-    g_main_context_iteration (ctx, TRUE);
-
-    if (g_cancellable_is_cancelled (self->priv->cancel))
-      break;
+    GstClockTime expiration_time = self->priv->timeout_expiration;
+    GstClockTime now = gst_util_get_timestamp ();
+    gint64 socket_timeout;
+
+    if (now >= expiration_time || (expiration_time - now) <= GST_MSECOND) {
+      socket_timeout = 0;
+    } else {
+      socket_timeout = (expiration_time - now) / GST_USECOND;
+    }
 
-    if (timeout) {
-      /* timed out, let's send another packet */
-      GST_DEBUG_OBJECT (self, "timed out");
+    GST_TRACE_OBJECT (self, "time out in %d microsecs please", socket_timeout);
 
-      packet = gst_net_time_packet_new (NULL);
+    if (!g_socket_condition_timed_wait (socket, G_IO_IN, socket_timeout,
+            self->priv->cancel, &err)) {
+      /* cancelled, timeout or error */
+      if (err->code == G_IO_ERROR_CANCELLED) {
+        GST_INFO_OBJECT (self, "cancelled");
+        g_clear_error (&err);
+        break;
+      } else if (err->code == G_IO_ERROR_TIMED_OUT) {
+        /* timed out, let's send another packet */
+        GST_DEBUG_OBJECT (self, "timed out");
 
-      packet->local_time = gst_clock_get_internal_time (GST_CLOCK (self));
+        packet = gst_net_time_packet_new (NULL);
 
-      GST_DEBUG_OBJECT (self, "sending packet, local time = %" GST_TIME_FORMAT,
-          GST_TIME_ARGS (packet->local_time));
+        packet->local_time = gst_clock_get_internal_time (GST_CLOCK (self));
 
-      gst_net_time_packet_send (packet, self->priv->socket,
-          self->priv->servaddr, NULL);
+        GST_DEBUG_OBJECT (self,
+            "sending packet, local time = %" GST_TIME_FORMAT,
+            GST_TIME_ARGS (packet->local_time));
 
-      g_free (packet);
+        gst_net_time_packet_send (packet, self->priv->socket,
+            self->priv->servaddr, NULL);
 
-      /* reset timeout (but are expecting a response sooner anyway) */
-      self->priv->timeout_expiration =
-          gst_util_get_timestamp () + gst_clock_get_timeout (clock);
-      continue;
-    }
+        g_free (packet);
 
-    /* got data to read? */
-    if ((cond & G_IO_IN)) {
+        /* reset timeout (but are expecting a response sooner anyway) */
+        self->priv->timeout_expiration =
+            gst_util_get_timestamp () + gst_clock_get_timeout (clock);
+      } else {
+        GST_DEBUG_OBJECT (self, "socket error: %s", err->message);
+        g_usleep (G_USEC_PER_SEC / 10); /* throttle */
+      }
+      g_clear_error (&err);
+    } else {
       GstClockTime new_local;
 
+      /* got packet */
+
       new_local = gst_clock_get_internal_time (GST_CLOCK (self));
 
       packet = gst_net_time_packet_receive (socket, NULL, &err);
 
-      if (err != NULL) {
+      if (packet != NULL) {
+        GST_LOG_OBJECT (self, "got packet back");
+        GST_LOG_OBJECT (self, "local_1 = %" GST_TIME_FORMAT,
+            GST_TIME_ARGS (packet->local_time));
+        GST_LOG_OBJECT (self, "remote = %" GST_TIME_FORMAT,
+            GST_TIME_ARGS (packet->remote_time));
+        GST_LOG_OBJECT (self, "local_2 = %" GST_TIME_FORMAT,
+            GST_TIME_ARGS (new_local));
+
+        /* observe_times will reset the timeout */
+        gst_net_client_clock_observe_times (self, packet->local_time,
+            packet->remote_time, new_local);
+
+        g_free (packet);
+      } else if (err != NULL) {
         GST_WARNING_OBJECT (self, "receive error: %s", err->message);
-        g_error_free (err);
-        err = NULL;
-        continue;
+        g_clear_error (&err);
       }
-
-      GST_LOG_OBJECT (self, "got packet back");
-      GST_LOG_OBJECT (self, "local_1 = %" GST_TIME_FORMAT,
-          GST_TIME_ARGS (packet->local_time));
-      GST_LOG_OBJECT (self, "remote = %" GST_TIME_FORMAT,
-          GST_TIME_ARGS (packet->remote_time));
-      GST_LOG_OBJECT (self, "local_2 = %" GST_TIME_FORMAT,
-          GST_TIME_ARGS (new_local));
-
-      /* observe_times will reset the timeout */
-      gst_net_client_clock_observe_times (self, packet->local_time,
-          packet->remote_time, new_local);
-
-      g_free (packet);
-      continue;
-    }
-
-    if ((cond & (G_IO_ERR | G_IO_HUP))) {
-      GST_DEBUG_OBJECT (self, "socket error?! %s", g_strerror (errno));
-      g_usleep (G_USEC_PER_SEC / 10);
-      continue;
     }
   }
 
   GST_INFO_OBJECT (self, "shutting down net client clock thread");
-  g_main_context_unref (ctx);
   return NULL;
 }
 
-- 
1.7.10.4