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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License ONLY.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gio/gio.h>
#include <xfconf-lifecycle-manager.h>
#define SHUTDOWN_TIMEOUT_SECONDS 300
enum
{
SIGNAL_SHUTDOWN,
N_SIGNALS,
};
static void xfconf_lifecycle_manager_finalize (GObject *object);
struct _XfconfLifecycleManagerPrivate
{
GMutex lock;
guint timeout_id;
guint use_count;
gboolean shutdown_emitted;
};
static guint lifecycle_manager_signals[N_SIGNALS];
G_DEFINE_TYPE_WITH_PRIVATE (XfconfLifecycleManager, xfconf_lifecycle_manager, G_TYPE_OBJECT)
static void
xfconf_lifecycle_manager_class_init (XfconfLifecycleManagerClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = xfconf_lifecycle_manager_finalize;
lifecycle_manager_signals[SIGNAL_SHUTDOWN] =
g_signal_new ("shutdown", XFCONF_TYPE_LIFECYCLE_MANAGER, G_SIGNAL_RUN_LAST, 0,
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
}
static void
xfconf_lifecycle_manager_init (XfconfLifecycleManager *manager)
{
manager->priv = xfconf_lifecycle_manager_get_instance_private (manager);
g_mutex_init (&manager->priv->lock);
manager->priv->timeout_id = 0;
manager->priv->use_count = 0;
manager->priv->shutdown_emitted = FALSE;
}
static void
xfconf_lifecycle_manager_finalize (GObject *object)
{
XfconfLifecycleManager *manager = XFCONF_LIFECYCLE_MANAGER (object);
g_mutex_clear (&manager->priv->lock);
G_OBJECT_CLASS (xfconf_lifecycle_manager_parent_class)->finalize (object);
}
static gboolean
xfconf_lifecycle_manager_timeout (gpointer user_data)
{
XfconfLifecycleManager *manager = user_data;
g_mutex_lock (&manager->priv->lock);
/* reschedule the timeout if the daemon is currently in use */
if (manager->priv->use_count > 0)
{
g_mutex_unlock (&manager->priv->lock);
return TRUE;
}
/* reset the timeout id */
manager->priv->timeout_id = 0;
/* emit the shutdown signal */
g_signal_emit (manager, lifecycle_manager_signals[SIGNAL_SHUTDOWN], 0);
/* set the shutdown emitted flag to force other threads not to reschedule
* the timeout */
manager->priv->shutdown_emitted = TRUE;
g_mutex_unlock (&manager->priv->lock);
return FALSE;
}
XfconfLifecycleManager *
xfconf_lifecycle_manager_new (void)
{
return g_object_new (XFCONF_TYPE_LIFECYCLE_MANAGER, NULL);
}
void
xfconf_lifecycle_manager_start (XfconfLifecycleManager *manager)
{
g_return_if_fail (XFCONF_IS_LIFECYCLE_MANAGER (manager));
g_mutex_lock (&manager->priv->lock);
/* ignore if there already is a timeout scheduled */
if (manager->priv->timeout_id != 0)
{
g_mutex_unlock (&manager->priv->lock);
return;
}
manager->priv->timeout_id =
g_timeout_add_seconds (SHUTDOWN_TIMEOUT_SECONDS,
xfconf_lifecycle_manager_timeout,
manager);
g_mutex_unlock (&manager->priv->lock);
}
gboolean
xfconf_lifecycle_manager_keep_alive (XfconfLifecycleManager *manager)
{
g_return_val_if_fail (XFCONF_IS_LIFECYCLE_MANAGER (manager), G_DBUS_METHOD_INVOCATION_UNHANDLED);
g_mutex_lock (&manager->priv->lock);
/* if the shutdown signal has been emitted, there's nothing we can do to prevent
* a shutdown anymore */
if (manager->priv->shutdown_emitted)
{
g_mutex_unlock (&manager->priv->lock);
return G_DBUS_METHOD_INVOCATION_UNHANDLED;
}
/* drop existing timeout, if any */
if (manager->priv->timeout_id != 0)
g_source_remove (manager->priv->timeout_id);
/* reschedule the shutdown timeout */
manager->priv->timeout_id =
g_timeout_add_seconds (SHUTDOWN_TIMEOUT_SECONDS,
xfconf_lifecycle_manager_timeout,
manager);
g_mutex_unlock (&manager->priv->lock);
return G_DBUS_METHOD_INVOCATION_UNHANDLED;
}
gboolean
xfconf_lifecycle_manager_increment_use_count (XfconfLifecycleManager *manager)
{
g_return_val_if_fail (XFCONF_IS_LIFECYCLE_MANAGER (manager), G_DBUS_METHOD_INVOCATION_UNHANDLED);
g_mutex_lock (&manager->priv->lock);
manager->priv->use_count++;
g_mutex_unlock (&manager->priv->lock);
return G_DBUS_METHOD_INVOCATION_UNHANDLED;
}
gboolean
xfconf_lifecycle_manager_decrement_use_count (XfconfLifecycleManager *manager)
{
g_return_val_if_fail (XFCONF_IS_LIFECYCLE_MANAGER (manager), G_DBUS_METHOD_INVOCATION_HANDLED);
g_mutex_lock (&manager->priv->lock);
/* decrement the use count, make sure not to drop below zero */
if (manager->priv->use_count > 0)
manager->priv->use_count--;
g_mutex_unlock (&manager->priv->lock);
return G_DBUS_METHOD_INVOCATION_HANDLED;
}
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