[glib] GTimeoutSource: simplify

[Ryan Lortie <ryanl src gnome org>]

commit db7d5306cce36ace71e6f7765a7669fc335747e8
Author: Ryan Lortie <desrt desrt ca>
Date:   Tue Aug 30 19:14:17 2011 -0400

    GTimeoutSource: simplify
    
    Take advantage of the new default handling of the 'prepare' and 'check'
    functions.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=657729

 glib/gmain.c |   50 +++++++++++---------------------------------------
 1 files changed, 11 insertions(+), 39 deletions(-)
---
diff --git a/glib/gmain.c b/glib/gmain.c
index b294459..f1a4592 100644
--- a/glib/gmain.c
+++ b/glib/gmain.c
@@ -281,7 +281,6 @@ struct _GMainLoop
 struct _GTimeoutSource
 {
   GSource     source;
-  gint64      expiration;
   guint       interval;
   gboolean    seconds;
 };
@@ -377,9 +376,6 @@ static gboolean g_source_iter_next  (GSourceIter   *iter,
 				     GSource      **source);
 static void     g_source_iter_clear (GSourceIter   *iter);
 
-static gboolean g_timeout_prepare  (GSource     *source,
-				    gint        *timeout);
-static gboolean g_timeout_check    (GSource     *source);
 static gboolean g_timeout_dispatch (GSource     *source,
 				    GSourceFunc  callback,
 				    gpointer     user_data);
@@ -446,8 +442,8 @@ static GSList *main_context_list = NULL;
 
 GSourceFuncs g_timeout_funcs =
 {
-  g_timeout_prepare,
-  g_timeout_check,
+  NULL, /* prepare */
+  NULL, /* check */
   g_timeout_dispatch,
   NULL
 };
@@ -4132,8 +4128,9 @@ static void
 g_timeout_set_expiration (GTimeoutSource *timeout_source,
                           gint64          current_time)
 {
-  timeout_source->expiration = current_time +
-                               (guint64) timeout_source->interval * 1000;
+  gint64 expiration;
+
+  expiration = current_time + (guint64) timeout_source->interval * 1000;
 
   if (timeout_source->seconds)
     {
@@ -4162,42 +4159,17 @@ g_timeout_set_expiration (GTimeoutSource *timeout_source,
        * always only *increase* the expiration time by adding a full
        * second in the case that the microsecond portion decreases.
        */
-      timeout_source->expiration -= timer_perturb;
+      expiration -= timer_perturb;
 
-      remainder = timeout_source->expiration % 1000000;
+      remainder = expiration % 1000000;
       if (remainder >= 1000000/4)
-        timeout_source->expiration += 1000000;
+        expiration += 1000000;
 
-      timeout_source->expiration -= remainder;
-      timeout_source->expiration += timer_perturb;
+      expiration -= remainder;
+      expiration += timer_perturb;
     }
-}
-
-static gboolean
-g_timeout_prepare (GSource *source,
-                   gint    *timeout)
-{
-  GTimeoutSource *timeout_source = (GTimeoutSource *) source;
-  gint64 now = g_source_get_time (source);
-
-  if (now < timeout_source->expiration)
-    {
-      /* Round up to ensure that we don't try again too early */
-      *timeout = (timeout_source->expiration - now + 999) / 1000;
-      return FALSE;
-    }
-
-  *timeout = 0;
-  return TRUE;
-}
-
-static gboolean 
-g_timeout_check (GSource *source)
-{
-  GTimeoutSource *timeout_source = (GTimeoutSource *) source;
-  gint64 now = g_source_get_time (source);
 
-  return timeout_source->expiration <= now;
+  g_source_set_ready_time ((GSource *) timeout_source, expiration);
 }
 
 static gboolean