D-Bus: dbus-resources.c Source File

D-Bus 1.14.10

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
54 struct DBusCounter
55{
56 int refcount;
58 long size_value;
59 long unix_fd_value;
61#ifdef DBUS_ENABLE_STATS
62 long peak_size_value;
63 long peak_unix_fd_value;
64#endif
65
66 long notify_size_guard_value;
67 long notify_unix_fd_guard_value;
69 DBusCounterNotifyFunction notify_function;
70 void *notify_data;
71 dbus_bool_t notify_pending : 1;
72 DBusRMutex *mutex;
73};
74 /* end of resource limits internals docs */
76
88 DBusCounter*
89_dbus_counter_new (void)
90{
91 DBusCounter *counter;
92
93 counter = dbus_new0 (DBusCounter, 1);
94 if (counter == NULL)
95 return NULL;
96
97 counter->refcount = 1;
98
99 _dbus_rmutex_new_at_location (&counter->mutex);
100 if (counter->mutex == NULL)
101 {
102 dbus_free (counter);
103 counter = NULL;
104 }
105
106 return counter;
107}
108
115 DBusCounter *
116_dbus_counter_ref (DBusCounter *counter)
117{
118 _dbus_rmutex_lock (counter->mutex);
119
120 _dbus_assert (counter->refcount > 0);
121
122 counter->refcount += 1;
123
124 _dbus_rmutex_unlock (counter->mutex);
125
126 return counter;
127}
128
135void
136_dbus_counter_unref (DBusCounter *counter)
137{
138 dbus_bool_t last_ref = FALSE;
139
140 _dbus_rmutex_lock (counter->mutex);
141
142 _dbus_assert (counter->refcount > 0);
143
144 counter->refcount -= 1;
145 last_ref = (counter->refcount == 0);
146
147 _dbus_rmutex_unlock (counter->mutex);
148
149 if (last_ref)
150 {
151 _dbus_rmutex_free_at_location (&counter->mutex);
152 dbus_free (counter);
153 }
154}
155
166void
167_dbus_counter_adjust_size (DBusCounter *counter,
168 long delta)
169{
170 long old = 0;
171
172 _dbus_rmutex_lock (counter->mutex);
173
174 old = counter->size_value;
175
176 counter->size_value += delta;
177
178#ifdef DBUS_ENABLE_STATS
179 if (counter->peak_size_value < counter->size_value)
180 counter->peak_size_value = counter->size_value;
181#endif
182
183#if 0
184 _dbus_verbose ("Adjusting counter %ld by %ld = %ld\n",
185 old, delta, counter->size_value);
186#endif
187
188 if (counter->notify_function != NULL &&
189 ((old < counter->notify_size_guard_value &&
190 counter->size_value >= counter->notify_size_guard_value) ||
191 (old >= counter->notify_size_guard_value &&
192 counter->size_value < counter->notify_size_guard_value)))
193 counter->notify_pending = TRUE;
194
195 _dbus_rmutex_unlock (counter->mutex);
196}
197
206void
207_dbus_counter_notify (DBusCounter *counter)
208{
209 DBusCounterNotifyFunction notify_function = NULL;
210 void *notify_data = NULL;
211
212 _dbus_rmutex_lock (counter->mutex);
213 if (counter->notify_pending)
214 {
215 counter->notify_pending = FALSE;
216 notify_function = counter->notify_function;
217 notify_data = counter->notify_data;
218 }
219 _dbus_rmutex_unlock (counter->mutex);
220
221 if (notify_function != NULL)
222 (* notify_function) (counter, notify_data);
223}
224
235void
236_dbus_counter_adjust_unix_fd (DBusCounter *counter,
237 long delta)
238{
239 long old = 0;
240
241 _dbus_rmutex_lock (counter->mutex);
242
243 old = counter->unix_fd_value;
244
245 counter->unix_fd_value += delta;
246
247#ifdef DBUS_ENABLE_STATS
248 if (counter->peak_unix_fd_value < counter->unix_fd_value)
249 counter->peak_unix_fd_value = counter->unix_fd_value;
250#endif
251
252#if 0
253 _dbus_verbose ("Adjusting counter %ld by %ld = %ld\n",
254 old, delta, counter->unix_fd_value);
255#endif
256
257 if (counter->notify_function != NULL &&
258 ((old < counter->notify_unix_fd_guard_value &&
259 counter->unix_fd_value >= counter->notify_unix_fd_guard_value) ||
260 (old >= counter->notify_unix_fd_guard_value &&
261 counter->unix_fd_value < counter->notify_unix_fd_guard_value)))
262 counter->notify_pending = TRUE;
263
264 _dbus_rmutex_unlock (counter->mutex);
265}
266
273long
274_dbus_counter_get_size_value (DBusCounter *counter)
275{
276 long result;
277 _dbus_rmutex_lock (counter->mutex);
278 result = counter->size_value;
279 _dbus_rmutex_unlock (counter->mutex);
280 return result;
281}
282
289long
290_dbus_counter_get_unix_fd_value (DBusCounter *counter)
291{
292 long result;
293 _dbus_rmutex_lock (counter->mutex);
294 result = counter->unix_fd_value;
295 _dbus_rmutex_unlock (counter->mutex);
296 return result;
297}
298
310void
311_dbus_counter_set_notify (DBusCounter *counter,
312 long size_guard_value,
313 long unix_fd_guard_value,
314 DBusCounterNotifyFunction function,
315 void *user_data)
316{
317 _dbus_rmutex_lock (counter->mutex);
318 counter->notify_size_guard_value = size_guard_value;
319 counter->notify_unix_fd_guard_value = unix_fd_guard_value;
320 counter->notify_function = function;
321 counter->notify_data = user_data;
322 counter->notify_pending = FALSE;
323 _dbus_rmutex_unlock (counter->mutex);
324}
325
326#ifdef DBUS_ENABLE_STATS
327long
328_dbus_counter_get_peak_size_value (DBusCounter *counter)
329{
330 return counter->peak_size_value;
331}
332
333long
334_dbus_counter_get_peak_unix_fd_value (DBusCounter *counter)
335{
336 return counter->peak_unix_fd_value;
337}
338#endif
339 /* 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:49
TRUE
#define TRUE
Expands to "1".
Definition dbus-macros.h:39
FALSE
#define FALSE
Expands to "0".
Definition dbus-macros.h:42
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition dbus-memory.c:692
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition dbus-memory.h:58
_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:311
_dbus_counter_new
DBusCounter * _dbus_counter_new(void)
Creates a new DBusCounter.
Definition dbus-resources.c:89
_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:290
_dbus_counter_unref
void _dbus_counter_unref(DBusCounter *counter)
Decrements refcount of the counter and possibly finalizes the counter.
Definition dbus-resources.c:136
_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:274
_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:236
_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:207
_dbus_counter_ref
DBusCounter * _dbus_counter_ref(DBusCounter *counter)
Increments refcount of the counter.
Definition dbus-resources.c:116
_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:167
_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:54
_dbus_rmutex_unlock
DBUS_PRIVATE_EXPORT void _dbus_rmutex_unlock(DBusRMutex *mutex)
Unlocks a mutex.
Definition dbus-threads.c:151
_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:95
_dbus_rmutex_lock
DBUS_PRIVATE_EXPORT void _dbus_rmutex_lock(DBusRMutex *mutex)
Locks a mutex.
Definition dbus-threads.c:123
DBusCounter
Internals of DBusCounter.
Definition dbus-resources.c:55
DBusCounter::refcount
int refcount
reference count
Definition dbus-resources.c:56
DBusCounter::notify_data
void * notify_data
data for notify function
Definition dbus-resources.c:70
DBusCounter::notify_function
DBusCounterNotifyFunction notify_function
notify function
Definition dbus-resources.c:69
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:67
DBusCounter::notify_pending
dbus_bool_t notify_pending
TRUE if the guard value has been crossed.
Definition dbus-resources.c:71
DBusCounter::size_value
long size_value
current size counter value
Definition dbus-resources.c:58
DBusCounter::mutex
DBusRMutex * mutex
Lock on the entire DBusCounter.
Definition dbus-resources.c:72
DBusCounter::unix_fd_value
long unix_fd_value
current unix fd counter value
Definition dbus-resources.c:59
DBusCounter::notify_size_guard_value
long notify_size_guard_value
call notify function when crossing this size value
Definition dbus-resources.c:66
DBusRMutex
Definition dbus-sysdeps-pthread.c:49