D-Bus: dbus-resources.c Source File

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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 * SPDX-License-Identifier: AFL-2.1 OR GPL-2.0-or-later
7 *
8 * Licensed under the Academic Free License version 2.1
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 *
24 */
25
26#include <config.h>
27#include <dbus/dbus-resources.h>
28#include <dbus/dbus-internals.h>
29
56 struct DBusCounter
57{
58 int refcount;
60 long size_value;
61 long unix_fd_value;
63#ifdef DBUS_ENABLE_STATS
64 long peak_size_value;
65 long peak_unix_fd_value;
66#endif
67
68 long notify_size_guard_value;
69 long notify_unix_fd_guard_value;
71 DBusCounterNotifyFunction notify_function;
72 void *notify_data;
73 dbus_bool_t notify_pending : 1;
74 DBusRMutex *mutex;
75};
76 /* end of resource limits internals docs */
78
90 DBusCounter*
91_dbus_counter_new (void)
92{
93 DBusCounter *counter;
94
95 counter = dbus_new0 (DBusCounter, 1);
96 if (counter == NULL)
97 return NULL;
98
99 counter->refcount = 1;
100
101 _dbus_rmutex_new_at_location (&counter->mutex);
102 if (counter->mutex == NULL)
103 {
104 dbus_free (counter);
105 counter = NULL;
106 }
107
108 return counter;
109}
110
117 DBusCounter *
118_dbus_counter_ref (DBusCounter *counter)
119{
120 _dbus_rmutex_lock (counter->mutex);
121
122 _dbus_assert (counter->refcount > 0);
123
124 counter->refcount += 1;
125
126 _dbus_rmutex_unlock (counter->mutex);
127
128 return counter;
129}
130
137void
138_dbus_counter_unref (DBusCounter *counter)
139{
140 dbus_bool_t last_ref = FALSE;
141
142 _dbus_rmutex_lock (counter->mutex);
143
144 _dbus_assert (counter->refcount > 0);
145
146 counter->refcount -= 1;
147 last_ref = (counter->refcount == 0);
148
149 _dbus_rmutex_unlock (counter->mutex);
150
151 if (last_ref)
152 {
153 _dbus_rmutex_free_at_location (&counter->mutex);
154 dbus_free (counter);
155 }
156}
157
168void
169_dbus_counter_adjust_size (DBusCounter *counter,
170 long delta)
171{
172 long old = 0;
173
174 _dbus_rmutex_lock (counter->mutex);
175
176 old = counter->size_value;
177
178 counter->size_value += delta;
179
180#ifdef DBUS_ENABLE_STATS
181 if (counter->peak_size_value < counter->size_value)
182 counter->peak_size_value = counter->size_value;
183#endif
184
185#if 0
186 _dbus_verbose ("Adjusting counter %ld by %ld = %ld\n",
187 old, delta, counter->size_value);
188#endif
189
190 if (counter->notify_function != NULL &&
191 ((old < counter->notify_size_guard_value &&
192 counter->size_value >= counter->notify_size_guard_value) ||
193 (old >= counter->notify_size_guard_value &&
194 counter->size_value < counter->notify_size_guard_value)))
195 counter->notify_pending = TRUE;
196
197 _dbus_rmutex_unlock (counter->mutex);
198}
199
208void
209_dbus_counter_notify (DBusCounter *counter)
210{
211 DBusCounterNotifyFunction notify_function = NULL;
212 void *notify_data = NULL;
213
214 _dbus_rmutex_lock (counter->mutex);
215 if (counter->notify_pending)
216 {
217 counter->notify_pending = FALSE;
218 notify_function = counter->notify_function;
219 notify_data = counter->notify_data;
220 }
221 _dbus_rmutex_unlock (counter->mutex);
222
223 if (notify_function != NULL)
224 (* notify_function) (counter, notify_data);
225}
226
237void
238_dbus_counter_adjust_unix_fd (DBusCounter *counter,
239 long delta)
240{
241 long old = 0;
242
243 _dbus_rmutex_lock (counter->mutex);
244
245 old = counter->unix_fd_value;
246
247 counter->unix_fd_value += delta;
248
249#ifdef DBUS_ENABLE_STATS
250 if (counter->peak_unix_fd_value < counter->unix_fd_value)
251 counter->peak_unix_fd_value = counter->unix_fd_value;
252#endif
253
254#if 0
255 _dbus_verbose ("Adjusting counter %ld by %ld = %ld\n",
256 old, delta, counter->unix_fd_value);
257#endif
258
259 if (counter->notify_function != NULL &&
260 ((old < counter->notify_unix_fd_guard_value &&
261 counter->unix_fd_value >= counter->notify_unix_fd_guard_value) ||
262 (old >= counter->notify_unix_fd_guard_value &&
263 counter->unix_fd_value < counter->notify_unix_fd_guard_value)))
264 counter->notify_pending = TRUE;
265
266 _dbus_rmutex_unlock (counter->mutex);
267}
268
275long
276_dbus_counter_get_size_value (DBusCounter *counter)
277{
278 long result;
279 _dbus_rmutex_lock (counter->mutex);
280 result = counter->size_value;
281 _dbus_rmutex_unlock (counter->mutex);
282 return result;
283}
284
291long
292_dbus_counter_get_unix_fd_value (DBusCounter *counter)
293{
294 long result;
295 _dbus_rmutex_lock (counter->mutex);
296 result = counter->unix_fd_value;
297 _dbus_rmutex_unlock (counter->mutex);
298 return result;
299}
300
312void
313_dbus_counter_set_notify (DBusCounter *counter,
314 long size_guard_value,
315 long unix_fd_guard_value,
316 DBusCounterNotifyFunction function,
317 void *user_data)
318{
319 _dbus_rmutex_lock (counter->mutex);
320 counter->notify_size_guard_value = size_guard_value;
321 counter->notify_unix_fd_guard_value = unix_fd_guard_value;
322 counter->notify_function = function;
323 counter->notify_data = user_data;
324 counter->notify_pending = FALSE;
325 _dbus_rmutex_unlock (counter->mutex);
326}
327
328#ifdef DBUS_ENABLE_STATS
329long
330_dbus_counter_get_peak_size_value (DBusCounter *counter)
331{
332 return counter->peak_size_value;
333}
334
335long
336_dbus_counter_get_peak_unix_fd_value (DBusCounter *counter)
337{
338 return counter->peak_unix_fd_value;
339}
340#endif
341 /* end of resource limits exported API */
_dbus_assert
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Definition dbus-internals.h:153
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
Definition dbus-macros.h:51
TRUE
#define TRUE
Expands to "1".
Definition dbus-macros.h:41
FALSE
#define FALSE
Expands to "0".
Definition dbus-macros.h:44
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition dbus-memory.c:710
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition dbus-memory.h:60
_dbus_counter_set_notify
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...
Definition dbus-resources.c:313
_dbus_counter_new
DBusCounter * _dbus_counter_new(void)
Creates a new DBusCounter.
Definition dbus-resources.c:91
_dbus_counter_get_unix_fd_value
long _dbus_counter_get_unix_fd_value(DBusCounter *counter)
Gets the current value of the unix fd counter.
Definition dbus-resources.c:292
_dbus_counter_unref
void _dbus_counter_unref(DBusCounter *counter)
Decrements refcount of the counter and possibly finalizes the counter.
Definition dbus-resources.c:138
_dbus_counter_get_size_value
long _dbus_counter_get_size_value(DBusCounter *counter)
Gets the current value of the size counter.
Definition dbus-resources.c:276
_dbus_counter_adjust_unix_fd
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.
Definition dbus-resources.c:238
_dbus_counter_notify
void _dbus_counter_notify(DBusCounter *counter)
Calls the notify function from _dbus_counter_set_notify(), if that function has been specified and th...
Definition dbus-resources.c:209
_dbus_counter_ref
DBusCounter * _dbus_counter_ref(DBusCounter *counter)
Increments refcount of the counter.
Definition dbus-resources.c:118
_dbus_counter_adjust_size
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.
Definition dbus-resources.c:169
_dbus_rmutex_new_at_location
void _dbus_rmutex_new_at_location(DBusRMutex **location_p)
Creates a new mutex or creates a no-op mutex if threads are not initialized.
Definition dbus-threads.c:56
_dbus_rmutex_unlock
DBUS_PRIVATE_EXPORT void _dbus_rmutex_unlock(DBusRMutex *mutex)
Unlocks a mutex.
Definition dbus-threads.c:153
_dbus_rmutex_free_at_location
void _dbus_rmutex_free_at_location(DBusRMutex **location_p)
Frees a DBusRMutex; does nothing if passed a NULL pointer.
Definition dbus-threads.c:97
_dbus_rmutex_lock
DBUS_PRIVATE_EXPORT void _dbus_rmutex_lock(DBusRMutex *mutex)
Locks a mutex.
Definition dbus-threads.c:125
DBusCounter
Internals of DBusCounter.
Definition dbus-resources.c:57
DBusCounter::refcount
int refcount
reference count
Definition dbus-resources.c:58
DBusCounter::notify_data
void * notify_data
data for notify function
Definition dbus-resources.c:72
DBusCounter::notify_function
DBusCounterNotifyFunction notify_function
notify function
Definition dbus-resources.c:71
DBusCounter::notify_unix_fd_guard_value
long notify_unix_fd_guard_value
call notify function when crossing this unix fd value
Definition dbus-resources.c:69
DBusCounter::notify_pending
dbus_bool_t notify_pending
TRUE if the guard value has been crossed.
Definition dbus-resources.c:73
DBusCounter::size_value
long size_value
current size counter value
Definition dbus-resources.c:60
DBusCounter::mutex
DBusRMutex * mutex
Lock on the entire DBusCounter.
Definition dbus-resources.c:74
DBusCounter::unix_fd_value
long unix_fd_value
current unix fd counter value
Definition dbus-resources.c:61
DBusCounter::notify_size_guard_value
long notify_size_guard_value
call notify function when crossing this size value
Definition dbus-resources.c:68
DBusRMutex
Definition dbus-sysdeps-pthread.c:51