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dbus-resources.c

00001 /* -*- mode: C; c-file-style: "gnu" -*- */
00002 /* dbus-resources.c Resource tracking/limits
00003  *
00004  * Copyright (C) 2003  Red Hat Inc.
00005  *
00006  * Licensed under the Academic Free License version 1.2
00007  * 
00008  * This program is free software; you can redistribute it and/or modify
00009  * it under the terms of the GNU General Public License as published by
00010  * the Free Software Foundation; either version 2 of the License, or
00011  * (at your option) any later version.
00012  *
00013  * This program is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016  * GNU General Public License for more details.
00017  * 
00018  * You should have received a copy of the GNU General Public License
00019  * along with this program; if not, write to the Free Software
00020  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00021  *
00022  */
00023 #include <dbus/dbus-resources.h>
00024 #include <dbus/dbus-internals.h>
00025 
00052 struct DBusCounter
00053 {
00054   int refcount;  
00056   long value;    
00058   long notify_guard_value; 
00059   DBusCounterNotifyFunction notify_function; 
00060   void *notify_data; 
00061 };
00062   /* end of resource limits internals docs */
00064 
00076 DBusCounter*
00077 _dbus_counter_new (void)
00078 {
00079   DBusCounter *counter;
00080 
00081   counter = dbus_new (DBusCounter, 1);
00082   if (counter == NULL)
00083     return NULL;
00084   
00085   counter->refcount = 1;
00086   counter->value = 0;
00087 
00088   counter->notify_guard_value = 0;
00089   counter->notify_function = NULL;
00090   counter->notify_data = NULL;
00091   
00092   return counter;
00093 }
00094 
00100 void
00101 _dbus_counter_ref (DBusCounter *counter)
00102 {
00103   _dbus_assert (counter->refcount > 0);
00104   
00105   counter->refcount += 1;
00106 }
00107 
00114 void
00115 _dbus_counter_unref (DBusCounter *counter)
00116 {
00117   _dbus_assert (counter->refcount > 0);
00118 
00119   counter->refcount -= 1;
00120 
00121   if (counter->refcount == 0)
00122     {
00123       
00124       dbus_free (counter);
00125     }
00126 }
00127 
00137 void
00138 _dbus_counter_adjust (DBusCounter *counter,
00139                       long         delta)
00140 {
00141   long old = counter->value;
00142   
00143   counter->value += delta;
00144 
00145 #if 0
00146   _dbus_verbose ("Adjusting counter %ld by %ld = %ld\n",
00147                  old, delta, counter->value);
00148 #endif
00149   
00150   if (counter->notify_function != NULL &&
00151       ((old < counter->notify_guard_value &&
00152         counter->value >= counter->notify_guard_value) ||
00153        (old >= counter->notify_guard_value &&
00154         counter->value < counter->notify_guard_value)))
00155     (* counter->notify_function) (counter, counter->notify_data);
00156 }
00157 
00164 long
00165 _dbus_counter_get_value (DBusCounter *counter)
00166 {
00167   return counter->value;
00168 }
00169 
00180 void
00181 _dbus_counter_set_notify (DBusCounter               *counter,
00182                           long                       guard_value,
00183                           DBusCounterNotifyFunction  function,
00184                           void                      *user_data)
00185 {
00186   counter->notify_guard_value = guard_value;
00187   counter->notify_function = function;
00188   counter->notify_data = user_data;
00189 }
00190   /* end of resource limits exported API */

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