[gdm] Throttle reloading passwd file to at most every 5 seconds

[William Jon McCann <mccann src gnome org>]

commit 1289b3db3ddb5ec33a1914ab2e96b3bb43d8946a
Author: William Jon McCann <jmccann redhat com>
Date:   Mon Jun 7 20:10:35 2010 -0400

    Throttle reloading passwd file to at most every 5 seconds
    
    https://bugzilla.gnome.org/show_bug.cgi?id=620908

 gui/simple-greeter/gdm-user-manager.c |   29 +++++++++++++++++++++++++++--
 1 files changed, 27 insertions(+), 2 deletions(-)
---
diff --git a/gui/simple-greeter/gdm-user-manager.c b/gui/simple-greeter/gdm-user-manager.c
index be2888d..d71fb72 100644
--- a/gui/simple-greeter/gdm-user-manager.c
+++ b/gui/simple-greeter/gdm-user-manager.c
@@ -96,6 +96,7 @@ struct GdmUserManagerPrivate
         gboolean               include_all;
 
         guint                  load_id;
+        guint                  reload_passwd_id;
         guint                  ck_history_id;
 
         guint8                 users_dirty : 1;
@@ -1556,6 +1557,25 @@ queue_load_users (GdmUserManager *manager)
         manager->priv->load_id = g_idle_add ((GSourceFunc)load_users_idle, manager);
 }
 
+static gboolean
+reload_passwd_idle (GdmUserManager *manager)
+{
+        reload_passwd (manager);
+        manager->priv->reload_passwd_id = 0;
+
+        return FALSE;
+}
+
+static void
+queue_reload_passwd (GdmUserManager *manager)
+{
+        if (manager->priv->reload_passwd_id > 0) {
+                g_source_remove (manager->priv->reload_passwd_id);
+        }
+
+        manager->priv->reload_passwd_id = g_timeout_add_seconds (5, (GSourceFunc)reload_passwd_idle, manager);
+}
+
 static void
 reload_shells (GdmUserManager *manager)
 {
@@ -1593,7 +1613,7 @@ on_shells_monitor_changed (GFileMonitor     *monitor,
         }
 
         reload_shells (manager);
-        reload_passwd (manager);
+        queue_reload_passwd (manager);
 }
 
 static void
@@ -1608,7 +1628,7 @@ on_passwd_monitor_changed (GFileMonitor     *monitor,
                 return;
         }
 
-        reload_passwd (manager);
+        queue_reload_passwd (manager);
 }
 
 static void
@@ -1814,6 +1834,11 @@ gdm_user_manager_finalize (GObject *object)
                 manager->priv->load_id = 0;
         }
 
+        if (manager->priv->reload_passwd_id > 0) {
+                g_source_remove (manager->priv->reload_passwd_id);
+                manager->priv->reload_passwd_id = 0;
+        }
+
         g_hash_table_destroy (manager->priv->sessions);
 
         g_file_monitor_cancel (manager->priv->passwd_monitor);