X-Git-Url: http://vcs.maemo.org/git/?a=blobdiff_plain;f=src%2Fdbus%2Fdbus-resources.c;fp=src%2Fdbus%2Fdbus-resources.c;h=5ff162251f0001856feabb7e1703087de2b42177;hb=d00115111c6ab0c3f82117c4e2c3d24663c4f1ce;hp=0000000000000000000000000000000000000000;hpb=19516645fd679ce8c6779722bb831a42d0b3ddfe;p=monky

diff --git a/src/dbus/dbus-resources.c b/src/dbus/dbus-resources.c
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+/* -*- 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 */