--- /dev/null
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* dbus-resources.c Resource tracking/limits
+ *
+ * Copyright (C) 2003 Red Hat Inc.
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include <dbus/dbus-resources.h>
+#include <dbus/dbus-internals.h>
+
+/**
+ * @defgroup DBusResources Resource limits related code
+ * @ingroup DBusInternals
+ * @brief DBusCounter and other stuff related to resource limits
+ *
+ * Types and functions related to tracking resource limits,
+ * such as the maximum amount of memory a connection can use
+ * for messages, etc.
+ */
+
+/**
+ * @defgroup DBusResourcesInternals Resource limits implementation details
+ * @ingroup DBusInternals
+ * @brief Resource limits implementation details
+ *
+ * Implementation details of resource limits code.
+ *
+ * @{
+ */
+
+/**
+ * @brief Internals of DBusCounter.
+ *
+ * DBusCounter internals. DBusCounter is an opaque object, it must be
+ * used via accessor functions.
+ */
+struct DBusCounter
+{
+ int refcount; /**< reference count */
+
+ long value; /**< current counter value */
+
+ long notify_guard_value; /**< call notify function when crossing this value */
+ DBusCounterNotifyFunction notify_function; /**< notify function */
+ void *notify_data; /**< data for notify function */
+};
+
+/** @} */ /* end of resource limits internals docs */
+
+/**
+ * @addtogroup DBusResources
+ * @{
+ */
+
+/**
+ * Creates a new DBusCounter. DBusCounter is used
+ * to count usage of some resource such as memory.
+ *
+ * @returns new counter or #NULL on failure
+ */
+DBusCounter*
+_dbus_counter_new (void)
+{
+ DBusCounter *counter;
+
+ counter = dbus_new (DBusCounter, 1);
+ if (counter == NULL)
+ return NULL;
+
+ counter->refcount = 1;
+ counter->value = 0;
+
+ counter->notify_guard_value = 0;
+ counter->notify_function = NULL;
+ counter->notify_data = NULL;
+
+ return counter;
+}
+
+/**
+ * Increments refcount of the counter
+ *
+ * @param counter the counter
+ * @returns the counter
+ */
+DBusCounter *
+_dbus_counter_ref (DBusCounter *counter)
+{
+ _dbus_assert (counter->refcount > 0);
+
+ counter->refcount += 1;
+
+ return counter;
+}
+
+/**
+ * Decrements refcount of the counter and possibly
+ * finalizes the counter.
+ *
+ * @param counter the counter
+ */
+void
+_dbus_counter_unref (DBusCounter *counter)
+{
+ _dbus_assert (counter->refcount > 0);
+
+ counter->refcount -= 1;
+
+ if (counter->refcount == 0)
+ {
+
+ dbus_free (counter);
+ }
+}
+
+/**
+ * Adjusts the value of the counter by the given
+ * delta which may be positive or negative.
+ * Calls the notify function from _dbus_counter_set_notify()
+ * if that function has been specified.
+ *
+ * @param counter the counter
+ * @param delta value to add to the counter's current value
+ */
+void
+_dbus_counter_adjust (DBusCounter *counter,
+ long delta)
+{
+ long old = counter->value;
+
+ counter->value += delta;
+
+#if 0
+ _dbus_verbose ("Adjusting counter %ld by %ld = %ld\n",
+ old, delta, counter->value);
+#endif
+
+ if (counter->notify_function != NULL &&
+ ((old < counter->notify_guard_value &&
+ counter->value >= counter->notify_guard_value) ||
+ (old >= counter->notify_guard_value &&
+ counter->value < counter->notify_guard_value)))
+ (* counter->notify_function) (counter, counter->notify_data);
+}
+
+/**
+ * Gets the current value of the counter.
+ *
+ * @param counter the counter
+ * @returns its current value
+ */
+long
+_dbus_counter_get_value (DBusCounter *counter)
+{
+ return counter->value;
+}
+
+/**
+ * Sets the notify function for this counter; the notify function is
+ * called whenever the counter's value crosses the guard value in
+ * either direction (moving up, or moving down).
+ *
+ * @param counter the counter
+ * @param guard_value the value we're notified if the counter crosses
+ * @param function function to call in order to notify
+ * @param user_data data to pass to the function
+ */
+void
+_dbus_counter_set_notify (DBusCounter *counter,
+ long guard_value,
+ DBusCounterNotifyFunction function,
+ void *user_data)
+{
+ counter->notify_guard_value = guard_value;
+ counter->notify_function = function;
+ counter->notify_data = user_data;
+}
+
+/** @} */ /* end of resource limits exported API */
projects / monky / blobdiff