author | srilekhas <srilekhas@symbian.org> |
Mon, 23 Aug 2010 14:43:58 +0100 | |
branch | RCL_3 |
changeset 55 | 9b31f530ce17 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* -*- mode: C; c-file-style: "gnu" -*- */ |
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/* dbus-resources.c Resource tracking/limits |
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* |
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* Copyright (C) 2003 Red Hat Inc. |
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* Portion Copyright © 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. |
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* Licensed under the Academic Free License version 2.1 |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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*/ |
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#ifdef __SYMBIAN32__ |
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//these are not system headers in build time |
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#include "dbus-resources.h" |
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#include "dbus-internals.h" |
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#else |
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#include <dbus/dbus-resources.h> |
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#include <dbus/dbus-internals.h> |
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#endif |
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|
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|
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/** |
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* @defgroup DBusResources Resource limits related code |
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* @ingroup DBusInternals |
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* @brief DBusCounter and other stuff related to resource limits |
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* |
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* Types and functions related to tracking resource limits, |
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* such as the maximum amount of memory a connection can use |
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* for messages, etc. |
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*/ |
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|
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/** |
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* @defgroup DBusResourcesInternals Resource limits implementation details |
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* @ingroup DBusInternals |
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* @brief Resource limits implementation details |
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* |
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* Implementation details of resource limits code. |
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* |
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* @{ |
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*/ |
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|
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/** |
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* @brief Internals of DBusCounter. |
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* |
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* DBusCounter internals. DBusCounter is an opaque object, it must be |
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* used via accessor functions. |
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*/ |
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struct DBusCounter |
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{ |
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int refcount; /**< reference count */ |
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|
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long value; /**< current counter value */ |
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|
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long notify_guard_value; /**< call notify function when crossing this value */ |
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DBusCounterNotifyFunction notify_function; /**< notify function */ |
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void *notify_data; /**< data for notify function */ |
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}; |
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/** @} */ /* end of resource limits internals docs */ |
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/** |
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* @addtogroup DBusResources |
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* @{ |
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*/ |
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|
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/** |
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* Creates a new DBusCounter. DBusCounter is used |
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* to count usage of some resource such as memory. |
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* |
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* @returns new counter or #NULL on failure |
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*/ |
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DBusCounter* |
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_dbus_counter_new (void) |
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{ |
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DBusCounter *counter; |
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|
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counter = dbus_new (DBusCounter, 1); |
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if (counter == NULL) |
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return NULL; |
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counter->refcount = 1; |
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counter->value = 0; |
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counter->notify_guard_value = 0; |
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counter->notify_function = NULL; |
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counter->notify_data = NULL; |
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return counter; |
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} |
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/** |
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* Increments refcount of the counter |
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* |
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* @param counter the counter |
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* @returns the counter |
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*/ |
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DBusCounter * |
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_dbus_counter_ref (DBusCounter *counter) |
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{ |
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_dbus_assert (counter->refcount > 0); |
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|
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counter->refcount += 1; |
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|
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return counter; |
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} |
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117 |
|
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/** |
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* Decrements refcount of the counter and possibly |
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* finalizes the counter. |
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* |
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* @param counter the counter |
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*/ |
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void |
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_dbus_counter_unref (DBusCounter *counter) |
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126 |
{ |
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_dbus_assert (counter->refcount > 0); |
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128 |
|
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counter->refcount -= 1; |
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130 |
|
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if (counter->refcount == 0) |
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132 |
{ |
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133 |
|
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dbus_free (counter); |
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} |
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} |
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137 |
|
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/** |
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* Adjusts the value of the counter by the given |
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* delta which may be positive or negative. |
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* Calls the notify function from _dbus_counter_set_notify() |
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* if that function has been specified. |
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* |
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* @param counter the counter |
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* @param delta value to add to the counter's current value |
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*/ |
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void |
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_dbus_counter_adjust (DBusCounter *counter, |
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long delta) |
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{ |
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long old = counter->value; |
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|
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counter->value += delta; |
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|
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#if 0 |
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_dbus_verbose ("Adjusting counter %ld by %ld = %ld\n", |
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old, delta, counter->value); |
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#endif |
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|
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if (counter->notify_function != NULL && |
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((old < counter->notify_guard_value && |
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counter->value >= counter->notify_guard_value) || |
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(old >= counter->notify_guard_value && |
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counter->value < counter->notify_guard_value))) |
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(* counter->notify_function) (counter, counter->notify_data); |
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} |
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|
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/** |
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* Gets the current value of the counter. |
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* |
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* @param counter the counter |
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* @returns its current value |
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*/ |
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long |
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_dbus_counter_get_value (DBusCounter *counter) |
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{ |
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return counter->value; |
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} |
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|
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/** |
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* Sets the notify function for this counter; the notify function is |
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* called whenever the counter's value crosses the guard value in |
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* either direction (moving up, or moving down). |
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* |
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* @param counter the counter |
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* @param guard_value the value we're notified if the counter crosses |
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* @param function function to call in order to notify |
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* @param user_data data to pass to the function |
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*/ |
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void |
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_dbus_counter_set_notify (DBusCounter *counter, |
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long guard_value, |
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DBusCounterNotifyFunction function, |
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void *user_data) |
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{ |
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counter->notify_guard_value = guard_value; |
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counter->notify_function = function; |
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counter->notify_data = user_data; |
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} |
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200 |
|
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/** @} */ /* end of resource limits exported API */ |