D-Bus  1.8.16
dbus-resources.c
1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-resources.c Resource tracking/limits
3  *
4  * Copyright (C) 2003 Red Hat Inc.
5  *
6  * Licensed under the Academic Free License version 2.1
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  *
22  */
23 
24 #include <config.h>
25 #include <dbus/dbus-resources.h>
26 #include <dbus/dbus-internals.h>
27 
55 {
56  int refcount;
58  long size_value;
61 #ifdef DBUS_ENABLE_STATS
62  long peak_size_value;
63  long peak_unix_fd_value;
64 #endif
65 
69  DBusCounterNotifyFunction notify_function;
70  void *notify_data;
72 };
73  /* end of resource limits internals docs */
75 
89 {
90  DBusCounter *counter;
91 
92  counter = dbus_new0 (DBusCounter, 1);
93  if (counter == NULL)
94  return NULL;
95 
96  counter->refcount = 1;
97 
98  return counter;
99 }
100 
107 DBusCounter *
109 {
110  _dbus_assert (counter->refcount > 0);
111 
112  counter->refcount += 1;
113 
114  return counter;
115 }
116 
123 void
125 {
126  _dbus_assert (counter->refcount > 0);
127 
128  counter->refcount -= 1;
129 
130  if (counter->refcount == 0)
131  {
132 
133  dbus_free (counter);
134  }
135 }
136 
147 void
149  long delta)
150 {
151  long old = counter->size_value;
152 
153  counter->size_value += delta;
154 
155 #ifdef DBUS_ENABLE_STATS
156  if (counter->peak_size_value < counter->size_value)
157  counter->peak_size_value = counter->size_value;
158 #endif
159 
160 #if 0
161  _dbus_verbose ("Adjusting counter %ld by %ld = %ld\n",
162  old, delta, counter->size_value);
163 #endif
164 
165  if (counter->notify_function != NULL &&
166  ((old < counter->notify_size_guard_value &&
167  counter->size_value >= counter->notify_size_guard_value) ||
168  (old >= counter->notify_size_guard_value &&
169  counter->size_value < counter->notify_size_guard_value)))
170  counter->notify_pending = TRUE;
171 }
172 
181 void
183 {
184  if (counter->notify_pending)
185  {
186  counter->notify_pending = FALSE;
187  (* counter->notify_function) (counter, counter->notify_data);
188  }
189 }
190 
201 void
203  long delta)
204 {
205  long old = counter->unix_fd_value;
206 
207  counter->unix_fd_value += delta;
208 
209 #ifdef DBUS_ENABLE_STATS
210  if (counter->peak_unix_fd_value < counter->unix_fd_value)
211  counter->peak_unix_fd_value = counter->unix_fd_value;
212 #endif
213 
214 #if 0
215  _dbus_verbose ("Adjusting counter %ld by %ld = %ld\n",
216  old, delta, counter->unix_fd_value);
217 #endif
218 
219  if (counter->notify_function != NULL &&
220  ((old < counter->notify_unix_fd_guard_value &&
221  counter->unix_fd_value >= counter->notify_unix_fd_guard_value) ||
222  (old >= counter->notify_unix_fd_guard_value &&
223  counter->unix_fd_value < counter->notify_unix_fd_guard_value)))
224  counter->notify_pending = TRUE;
225 }
226 
233 long
235 {
236  return counter->size_value;
237 }
238 
245 long
247 {
248  return counter->unix_fd_value;
249 }
250 
262 void
264  long size_guard_value,
265  long unix_fd_guard_value,
266  DBusCounterNotifyFunction function,
267  void *user_data)
268 {
269  counter->notify_size_guard_value = size_guard_value;
270  counter->notify_unix_fd_guard_value = unix_fd_guard_value;
271  counter->notify_function = function;
272  counter->notify_data = user_data;
273  counter->notify_pending = FALSE;
274 }
275 
276 #ifdef DBUS_ENABLE_STATS
277 long
278 _dbus_counter_get_peak_size_value (DBusCounter *counter)
279 {
280  return counter->peak_size_value;
281 }
282 
283 long
284 _dbus_counter_get_peak_unix_fd_value (DBusCounter *counter)
285 {
286  return counter->peak_unix_fd_value;
287 }
288 #endif
289  /* end of resource limits exported API */
#define NULL
A null pointer, defined appropriately for C or C++.
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:701
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Internals of DBusCounter.
DBusCounterNotifyFunction notify_function
notify function
DBusCounter * _dbus_counter_ref(DBusCounter *counter)
Increments refcount of the counter.
long size_value
current size counter value
void * notify_data
data for notify function
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:59
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
void _dbus_counter_unref(DBusCounter *counter)
Decrements refcount of the counter and possibly finalizes the counter.
void _dbus_counter_adjust_unix_fd(DBusCounter *counter, long delta)
Adjusts the value of the unix fd counter by the given delta which may be positive or negative...
dbus_bool_t notify_pending
TRUE if the guard value has been crossed.
long unix_fd_value
current unix fd counter value
#define TRUE
Expands to "1".
void _dbus_counter_set_notify(DBusCounter *counter, long size_guard_value, long unix_fd_guard_value, DBusCounterNotifyFunction function, void *user_data)
Sets the notify function for this counter; the notify function is called whenever the counter's value...
void _dbus_counter_notify(DBusCounter *counter)
Calls the notify function from _dbus_counter_set_notify(), if that function has been specified and th...
long notify_unix_fd_guard_value
call notify function when crossing this unix fd value
long notify_size_guard_value
call notify function when crossing this size value
DBusCounter * _dbus_counter_new(void)
Creates a new DBusCounter.
int refcount
reference count
#define FALSE
Expands to "0".
long _dbus_counter_get_unix_fd_value(DBusCounter *counter)
Gets the current value of the unix fd counter.
long _dbus_counter_get_size_value(DBusCounter *counter)
Gets the current value of the size counter.
void _dbus_counter_adjust_size(DBusCounter *counter, long delta)
Adjusts the value of the size counter by the given delta which may be positive or negative...