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<hr><h1>dbus-mainloop.c</h1><div class="fragment"><pre>00001 <font class="comment">/* -*- mode: C; c-file-style: "gnu" -*- */</font>
00002 <font class="comment">/* dbus-mainloop.c Main loop utility</font>
00003 <font class="comment"> *</font>
00004 <font class="comment"> * Copyright (C) 2003 Red Hat, Inc.</font>
00005 <font class="comment"> *</font>
00006 <font class="comment"> * Licensed under the Academic Free License version 2.0</font>
00007 <font class="comment"> * </font>
00008 <font class="comment"> * This program is free software; you can redistribute it and/or modify</font>
00009 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00010 <font class="comment"> * the Free Software Foundation; either version 2 of the License, or</font>
00011 <font class="comment"> * (at your option) any later version.</font>
00012 <font class="comment"> *</font>
00013 <font class="comment"> * This program is distributed in the hope that it will be useful,</font>
00014 <font class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00015 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</font>
00016 <font class="comment"> * GNU General Public License for more details.</font>
00017 <font class="comment"> * </font>
00018 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00019 <font class="comment"> * along with this program; if not, write to the Free Software</font>
00020 <font class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</font>
00021 <font class="comment"> *</font>
00022 <font class="comment"> */</font>
00023
00024 <font class="preprocessor">#include "dbus-mainloop.h"</font>
00025
00026 <font class="preprocessor">#ifndef DOXYGEN_SHOULD_SKIP_THIS</font>
00027 <font class="preprocessor"></font>
00028 <font class="preprocessor">#include <dbus/dbus-list.h></font>
00029 <font class="preprocessor">#include <dbus/dbus-sysdeps.h></font>
00030
00031 <font class="preprocessor">#define MAINLOOP_SPEW 0</font>
00032 <font class="preprocessor"></font>
00033 <font class="keyword">struct </font>DBusLoop
00034 {
00035 <font class="keywordtype">int</font> refcount;
00036 <a class="code" href="structDBusList.html">DBusList</a> *callbacks;
00037 <font class="keywordtype">int</font> callback_list_serial;
00038 <font class="keywordtype">int</font> watch_count;
00039 <font class="keywordtype">int</font> timeout_count;
00040 <font class="keywordtype">int</font> depth;
00041 <a class="code" href="structDBusList.html">DBusList</a> *need_dispatch;
00042 };
00043
00044 <font class="keyword">typedef</font> <font class="keyword">enum</font>
00045 {
00046 CALLBACK_WATCH,
00047 CALLBACK_TIMEOUT
00048 } CallbackType;
00049
00050 <font class="keyword">typedef</font> <font class="keyword">struct</font>
00051 <font class="keyword"></font>{
00052 <font class="keywordtype">int</font> refcount;
00053 CallbackType type;
00054 <font class="keywordtype">void</font> *data;
00055 DBusFreeFunction free_data_func;
00056 } Callback;
00057
00058 <font class="keyword">typedef</font> <font class="keyword">struct</font>
00059 <font class="keyword"></font>{
00060 Callback callback;
00061 DBusWatchFunction function;
00062 <a class="code" href="structDBusWatch.html">DBusWatch</a> *watch;
00063 <font class="comment">/* last watch handle failed due to OOM */</font>
00064 <font class="keywordtype">unsigned</font> <font class="keywordtype">int</font> last_iteration_oom : 1;
00065 } WatchCallback;
00066
00067 <font class="keyword">typedef</font> <font class="keyword">struct</font>
00068 <font class="keyword"></font>{
00069 Callback callback;
00070 <a class="code" href="structDBusTimeout.html">DBusTimeout</a> *timeout;
00071 DBusTimeoutFunction function;
00072 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> last_tv_sec;
00073 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> last_tv_usec;
00074 } TimeoutCallback;
00075
00076 <font class="preprocessor">#define WATCH_CALLBACK(callback) ((WatchCallback*)callback)</font>
00077 <font class="preprocessor"></font><font class="preprocessor">#define TIMEOUT_CALLBACK(callback) ((TimeoutCallback*)callback)</font>
00078 <font class="preprocessor"></font>
00079 <font class="keyword">static</font> WatchCallback*
00080 watch_callback_new (<a class="code" href="structDBusWatch.html">DBusWatch</a> *watch,
00081 DBusWatchFunction function,
00082 <font class="keywordtype">void</font> *data,
00083 DBusFreeFunction free_data_func)
00084 {
00085 WatchCallback *cb;
00086
00087 cb = dbus_new (WatchCallback, 1);
00088 <font class="keywordflow">if</font> (cb == NULL)
00089 <font class="keywordflow">return</font> NULL;
00090
00091 cb->watch = watch;
00092 cb->function = function;
00093 cb->last_iteration_oom = FALSE;
00094 cb->callback.refcount = 1;
00095 cb->callback.type = CALLBACK_WATCH;
00096 cb->callback.data = data;
00097 cb->callback.free_data_func = free_data_func;
00098
00099 <font class="keywordflow">return</font> cb;
00100 }
00101
00102 <font class="keyword">static</font> TimeoutCallback*
00103 timeout_callback_new (<a class="code" href="structDBusTimeout.html">DBusTimeout</a> *timeout,
00104 DBusTimeoutFunction function,
00105 <font class="keywordtype">void</font> *data,
00106 DBusFreeFunction free_data_func)
00107 {
00108 TimeoutCallback *cb;
00109
00110 cb = dbus_new (TimeoutCallback, 1);
00111 <font class="keywordflow">if</font> (cb == NULL)
00112 <font class="keywordflow">return</font> NULL;
00113
00114 cb->timeout = timeout;
00115 cb->function = function;
00116 _dbus_get_current_time (&cb->last_tv_sec,
00117 &cb->last_tv_usec);
00118 cb->callback.refcount = 1;
00119 cb->callback.type = CALLBACK_TIMEOUT;
00120 cb->callback.data = data;
00121 cb->callback.free_data_func = free_data_func;
00122
00123 <font class="keywordflow">return</font> cb;
00124 }
00125
00126 <font class="keyword">static</font> Callback *
00127 callback_ref (Callback *cb)
00128 {
00129 _dbus_assert (cb->refcount > 0);
00130
00131 cb->refcount += 1;
00132
00133 <font class="keywordflow">return</font> cb;
00134 }
00135
00136 <font class="keyword">static</font> <font class="keywordtype">void</font>
00137 callback_unref (Callback *cb)
00138 {
00139 _dbus_assert (cb->refcount > 0);
00140
00141 cb->refcount -= 1;
00142
00143 <font class="keywordflow">if</font> (cb->refcount == 0)
00144 {
00145 <font class="keywordflow">if</font> (cb->free_data_func)
00146 (* cb->free_data_func) (cb->data);
00147
00148 dbus_free (cb);
00149 }
00150 }
00151
00152 <font class="keyword">static</font> dbus_bool_t
00153 add_callback (DBusLoop *loop,
00154 Callback *cb)
00155 {
00156 <font class="keywordflow">if</font> (!_dbus_list_append (&loop->callbacks, cb))
00157 <font class="keywordflow">return</font> FALSE;
00158
00159 loop->callback_list_serial += 1;
00160
00161 <font class="keywordflow">switch</font> (cb->type)
00162 {
00163 <font class="keywordflow">case</font> CALLBACK_WATCH:
00164 loop->watch_count += 1;
00165 <font class="keywordflow">break</font>;
00166 <font class="keywordflow">case</font> CALLBACK_TIMEOUT:
00167 loop->timeout_count += 1;
00168 <font class="keywordflow">break</font>;
00169 }
00170
00171 <font class="keywordflow">return</font> TRUE;
00172 }
00173
00174 <font class="keyword">static</font> <font class="keywordtype">void</font>
00175 remove_callback (DBusLoop *loop,
00176 <a class="code" href="structDBusList.html">DBusList</a> *link)
00177 {
00178 Callback *cb = link-><a class="code" href="structDBusList.html#m2">data</a>;
00179
00180 <font class="keywordflow">switch</font> (cb->type)
00181 {
00182 <font class="keywordflow">case</font> CALLBACK_WATCH:
00183 loop->watch_count -= 1;
00184 <font class="keywordflow">break</font>;
00185 <font class="keywordflow">case</font> CALLBACK_TIMEOUT:
00186 loop->timeout_count -= 1;
00187 <font class="keywordflow">break</font>;
00188 }
00189
00190 callback_unref (cb);
00191 _dbus_list_remove_link (&loop->callbacks, link);
00192 loop->callback_list_serial += 1;
00193 }
00194
00195 DBusLoop*
00196 _dbus_loop_new (<font class="keywordtype">void</font>)
00197 {
00198 DBusLoop *loop;
00199
00200 loop = dbus_new0 (DBusLoop, 1);
00201 <font class="keywordflow">if</font> (loop == NULL)
00202 <font class="keywordflow">return</font> NULL;
00203
00204 loop->refcount = 1;
00205
00206 <font class="keywordflow">return</font> loop;
00207 }
00208
00209 DBusLoop *
00210 _dbus_loop_ref (DBusLoop *loop)
00211 {
00212 _dbus_assert (loop != NULL);
00213 _dbus_assert (loop->refcount > 0);
00214
00215 loop->refcount += 1;
00216
00217 <font class="keywordflow">return</font> loop;
00218 }
00219
00220 <font class="keywordtype">void</font>
00221 _dbus_loop_unref (DBusLoop *loop)
00222 {
00223 _dbus_assert (loop != NULL);
00224 _dbus_assert (loop->refcount > 0);
00225
00226 loop->refcount -= 1;
00227 <font class="keywordflow">if</font> (loop->refcount == 0)
00228 {
00229 <font class="keywordflow">while</font> (loop->need_dispatch)
00230 {
00231 <a class="code" href="structDBusConnection.html">DBusConnection</a> *connection = _dbus_list_pop_first (&loop->need_dispatch);
00232
00233 dbus_connection_unref (connection);
00234 }
00235
00236 dbus_free (loop);
00237 }
00238 }
00239
00240 dbus_bool_t
00241 _dbus_loop_add_watch (DBusLoop *loop,
00242 <a class="code" href="structDBusWatch.html">DBusWatch</a> *watch,
00243 DBusWatchFunction function,
00244 <font class="keywordtype">void</font> *data,
00245 DBusFreeFunction free_data_func)
00246 {
00247 WatchCallback *wcb;
00248
00249 wcb = watch_callback_new (watch, function, data, free_data_func);
00250 <font class="keywordflow">if</font> (wcb == NULL)
00251 <font class="keywordflow">return</font> FALSE;
00252
00253 <font class="keywordflow">if</font> (!add_callback (loop, (Callback*) wcb))
00254 {
00255 wcb->callback.free_data_func = NULL; <font class="comment">/* don't want to have this side effect */</font>
00256 callback_unref ((Callback*) wcb);
00257 <font class="keywordflow">return</font> FALSE;
00258 }
00259
00260 <font class="keywordflow">return</font> TRUE;
00261 }
00262
00263 <font class="keywordtype">void</font>
00264 _dbus_loop_remove_watch (DBusLoop *loop,
00265 <a class="code" href="structDBusWatch.html">DBusWatch</a> *watch,
00266 DBusWatchFunction function,
00267 <font class="keywordtype">void</font> *data)
00268 {
00269 <a class="code" href="structDBusList.html">DBusList</a> *link;
00270
00271 link = _dbus_list_get_first_link (&loop->callbacks);
00272 <font class="keywordflow">while</font> (link != NULL)
00273 {
00274 <a class="code" href="structDBusList.html">DBusList</a> *next = _dbus_list_get_next_link (&loop->callbacks, link);
00275 Callback *<font class="keyword">this</font> = link-><a class="code" href="structDBusList.html#m2">data</a>;
00276
00277 <font class="keywordflow">if</font> (this->type == CALLBACK_WATCH &&
00278 WATCH_CALLBACK (<font class="keyword">this</font>)->watch == watch &&
00279 this->data == data &&
00280 WATCH_CALLBACK (<font class="keyword">this</font>)->function == function)
00281 {
00282 remove_callback (loop, link);
00283
00284 <font class="keywordflow">return</font>;
00285 }
00286
00287 link = next;
00288 }
00289
00290 _dbus_warn (<font class="stringliteral">"could not find watch %p function %p data %p to remove\n"</font>,
00291 watch, (<font class="keywordtype">void</font> *)function, data);
00292 }
00293
00294 dbus_bool_t
00295 _dbus_loop_add_timeout (DBusLoop *loop,
00296 <a class="code" href="structDBusTimeout.html">DBusTimeout</a> *timeout,
00297 DBusTimeoutFunction function,
00298 <font class="keywordtype">void</font> *data,
00299 DBusFreeFunction free_data_func)
00300 {
00301 TimeoutCallback *tcb;
00302
00303 tcb = timeout_callback_new (timeout, function, data, free_data_func);
00304 <font class="keywordflow">if</font> (tcb == NULL)
00305 <font class="keywordflow">return</font> FALSE;
00306
00307 <font class="keywordflow">if</font> (!add_callback (loop, (Callback*) tcb))
00308 {
00309 tcb->callback.free_data_func = NULL; <font class="comment">/* don't want to have this side effect */</font>
00310 callback_unref ((Callback*) tcb);
00311 <font class="keywordflow">return</font> FALSE;
00312 }
00313
00314 <font class="keywordflow">return</font> TRUE;
00315 }
00316
00317 <font class="keywordtype">void</font>
00318 _dbus_loop_remove_timeout (DBusLoop *loop,
00319 <a class="code" href="structDBusTimeout.html">DBusTimeout</a> *timeout,
00320 DBusTimeoutFunction function,
00321 <font class="keywordtype">void</font> *data)
00322 {
00323 <a class="code" href="structDBusList.html">DBusList</a> *link;
00324
00325 link = _dbus_list_get_first_link (&loop->callbacks);
00326 <font class="keywordflow">while</font> (link != NULL)
00327 {
00328 <a class="code" href="structDBusList.html">DBusList</a> *next = _dbus_list_get_next_link (&loop->callbacks, link);
00329 Callback *<font class="keyword">this</font> = link-><a class="code" href="structDBusList.html#m2">data</a>;
00330
00331 <font class="keywordflow">if</font> (this->type == CALLBACK_TIMEOUT &&
00332 TIMEOUT_CALLBACK (<font class="keyword">this</font>)->timeout == timeout &&
00333 this->data == data &&
00334 TIMEOUT_CALLBACK (<font class="keyword">this</font>)->function == function)
00335 {
00336 remove_callback (loop, link);
00337
00338 <font class="keywordflow">return</font>;
00339 }
00340
00341 link = next;
00342 }
00343
00344 _dbus_warn (<font class="stringliteral">"could not find timeout %p function %p data %p to remove\n"</font>,
00345 timeout, (<font class="keywordtype">void</font> *)function, data);
00346 }
00347
00348 <font class="comment">/* Convolutions from GLib, there really must be a better way</font>
00349 <font class="comment"> * to do this.</font>
00350 <font class="comment"> */</font>
00351 <font class="keyword">static</font> dbus_bool_t
00352 check_timeout (<font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> tv_sec,
00353 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> tv_usec,
00354 TimeoutCallback *tcb,
00355 <font class="keywordtype">int</font> *timeout)
00356 {
00357 <font class="keywordtype">long</font> sec_remaining;
00358 <font class="keywordtype">long</font> msec_remaining;
00359 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> expiration_tv_sec;
00360 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> expiration_tv_usec;
00361 <font class="keywordtype">long</font> interval_seconds;
00362 <font class="keywordtype">long</font> interval_milliseconds;
00363 <font class="keywordtype">int</font> interval;
00364
00365 <font class="comment">/* I'm pretty sure this function could suck (a lot) less */</font>
00366
00367 interval = dbus_timeout_get_interval (tcb->timeout);
00368
00369 interval_seconds = interval / 1000L;
00370 interval_milliseconds = interval % 1000L;
00371
00372 expiration_tv_sec = tcb->last_tv_sec + interval_seconds;
00373 expiration_tv_usec = tcb->last_tv_usec + interval_milliseconds * 1000;
00374 <font class="keywordflow">if</font> (expiration_tv_usec >= 1000000)
00375 {
00376 expiration_tv_usec -= 1000000;
00377 expiration_tv_sec += 1;
00378 }
00379
00380 sec_remaining = expiration_tv_sec - tv_sec;
00381 <font class="comment">/* need to force this to be signed, as it is intended to sometimes</font>
00382 <font class="comment"> * produce a negative result</font>
00383 <font class="comment"> */</font>
00384 msec_remaining = ((long) expiration_tv_usec - (long) tv_usec) / 1000L;
00385
00386 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00387 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">"Interval is %ld seconds %ld msecs\n"</font>,
00388 interval_seconds,
00389 interval_milliseconds);
00390 _dbus_verbose (<font class="stringliteral">"Now is %lu seconds %lu usecs\n"</font>,
00391 tv_sec, tv_usec);
00392 _dbus_verbose (<font class="stringliteral">"Last is %lu seconds %lu usecs\n"</font>,
00393 tcb->last_tv_sec, tcb->last_tv_usec);
00394 _dbus_verbose (<font class="stringliteral">"Exp is %lu seconds %lu usecs\n"</font>,
00395 expiration_tv_sec, expiration_tv_usec);
00396 _dbus_verbose (<font class="stringliteral">"Pre-correction, sec_remaining %ld msec_remaining %ld\n"</font>,
00397 sec_remaining, msec_remaining);
00398 <font class="preprocessor">#endif</font>
00399 <font class="preprocessor"></font>
00400 <font class="comment">/* We do the following in a rather convoluted fashion to deal with</font>
00401 <font class="comment"> * the fact that we don't have an integral type big enough to hold</font>
00402 <font class="comment"> * the difference of two timevals in milliseconds.</font>
00403 <font class="comment"> */</font>
00404 <font class="keywordflow">if</font> (sec_remaining < 0 || (sec_remaining == 0 && msec_remaining < 0))
00405 {
00406 *timeout = 0;
00407 }
00408 <font class="keywordflow">else</font>
00409 {
00410 <font class="keywordflow">if</font> (msec_remaining < 0)
00411 {
00412 msec_remaining += 1000;
00413 sec_remaining -= 1;
00414 }
00415
00416 <font class="keywordflow">if</font> (sec_remaining > (_DBUS_INT_MAX / 1000) ||
00417 msec_remaining > _DBUS_INT_MAX)
00418 *timeout = _DBUS_INT_MAX;
00419 <font class="keywordflow">else</font>
00420 *timeout = sec_remaining * 1000 + msec_remaining;
00421 }
00422
00423 <font class="keywordflow">if</font> (*timeout > interval)
00424 {
00425 <font class="comment">/* This indicates that the system clock probably moved backward */</font>
00426 _dbus_verbose (<font class="stringliteral">"System clock set backward! Resetting timeout.\n"</font>);
00427
00428 tcb->last_tv_sec = tv_sec;
00429 tcb->last_tv_usec = tv_usec;
00430
00431 *timeout = interval;
00432 }
00433
00434 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00435 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" timeout expires in %d milliseconds\n"</font>, *timeout);
00436 <font class="preprocessor">#endif</font>
00437 <font class="preprocessor"></font>
00438 <font class="keywordflow">return</font> *timeout == 0;
00439 }
00440
00441 dbus_bool_t
00442 _dbus_loop_dispatch (DBusLoop *loop)
00443 {
00444
00445 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00446 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" %d connections to dispatch\n"</font>, _dbus_list_get_length (&loop->need_dispatch));
00447 <font class="preprocessor">#endif</font>
00448 <font class="preprocessor"></font>
00449 <font class="keywordflow">if</font> (loop->need_dispatch == NULL)
00450 <font class="keywordflow">return</font> FALSE;
00451
00452 next:
00453 <font class="keywordflow">while</font> (loop->need_dispatch != NULL)
00454 {
00455 <a class="code" href="structDBusConnection.html">DBusConnection</a> *connection = _dbus_list_pop_first (&loop->need_dispatch);
00456
00457 <font class="keywordflow">while</font> (TRUE)
00458 {
00459 DBusDispatchStatus status;
00460
00461 status = dbus_connection_dispatch (connection);
00462
00463 <font class="keywordflow">if</font> (status == DBUS_DISPATCH_COMPLETE)
00464 {
00465 dbus_connection_unref (connection);
00466 <font class="keywordflow">goto</font> next;
00467 }
00468 <font class="keywordflow">else</font>
00469 {
00470 <font class="keywordflow">if</font> (status == DBUS_DISPATCH_NEED_MEMORY)
00471 _dbus_wait_for_memory ();
00472 }
00473 }
00474 }
00475
00476 <font class="keywordflow">return</font> TRUE;
00477 }
00478
00479 dbus_bool_t
00480 _dbus_loop_queue_dispatch (DBusLoop *loop,
00481 <a class="code" href="structDBusConnection.html">DBusConnection</a> *connection)
00482 {
00483 <font class="keywordflow">if</font> (_dbus_list_append (&loop->need_dispatch, connection))
00484 {
00485 dbus_connection_ref (connection);
00486 <font class="keywordflow">return</font> TRUE;
00487 }
00488 <font class="keywordflow">else</font>
00489 <font class="keywordflow">return</font> FALSE;
00490 }
00491
00492 <font class="comment">/* Returns TRUE if we invoked any timeouts or have ready file</font>
00493 <font class="comment"> * descriptors, which is just used in test code as a debug hack</font>
00494 <font class="comment"> */</font>
00495
00496 dbus_bool_t
00497 _dbus_loop_iterate (DBusLoop *loop,
00498 dbus_bool_t block)
00499 {
00500 <font class="preprocessor">#define N_STACK_DESCRIPTORS 64</font>
00501 <font class="preprocessor"></font> dbus_bool_t retval;
00502 <a class="code" href="structDBusPollFD.html">DBusPollFD</a> *fds;
00503 <a class="code" href="structDBusPollFD.html">DBusPollFD</a> stack_fds[N_STACK_DESCRIPTORS];
00504 <font class="keywordtype">int</font> n_fds;
00505 WatchCallback **watches_for_fds;
00506 WatchCallback *stack_watches_for_fds[N_STACK_DESCRIPTORS];
00507 <font class="keywordtype">int</font> i;
00508 <a class="code" href="structDBusList.html">DBusList</a> *link;
00509 <font class="keywordtype">int</font> n_ready;
00510 <font class="keywordtype">int</font> initial_serial;
00511 <font class="keywordtype">long</font> timeout;
00512 dbus_bool_t oom_watch_pending;
00513 <font class="keywordtype">int</font> orig_depth;
00514
00515 retval = FALSE;
00516
00517 fds = NULL;
00518 watches_for_fds = NULL;
00519 n_fds = 0;
00520 oom_watch_pending = FALSE;
00521 orig_depth = loop->depth;
00522
00523 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00524 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">"Iteration block=%d depth=%d timeout_count=%d watch_count=%d\n"</font>,
00525 block, loop->depth, loop->timeout_count, loop->watch_count);
00526 <font class="preprocessor">#endif</font>
00527 <font class="preprocessor"></font>
00528 <font class="keywordflow">if</font> (loop->callbacks == NULL)
00529 <font class="keywordflow">goto</font> next_iteration;
00530
00531 <font class="keywordflow">if</font> (loop->watch_count > N_STACK_DESCRIPTORS)
00532 {
00533 fds = dbus_new0 (<a class="code" href="structDBusPollFD.html">DBusPollFD</a>, loop->watch_count);
00534
00535 <font class="keywordflow">while</font> (fds == NULL)
00536 {
00537 _dbus_wait_for_memory ();
00538 fds = dbus_new0 (<a class="code" href="structDBusPollFD.html">DBusPollFD</a>, loop->watch_count);
00539 }
00540
00541 watches_for_fds = dbus_new (WatchCallback*, loop->watch_count);
00542 <font class="keywordflow">while</font> (watches_for_fds == NULL)
00543 {
00544 _dbus_wait_for_memory ();
00545 watches_for_fds = dbus_new (WatchCallback*, loop->watch_count);
00546 }
00547 }
00548 <font class="keywordflow">else</font>
00549 {
00550 fds = stack_fds;
00551 watches_for_fds = stack_watches_for_fds;
00552 }
00553
00554 <font class="comment">/* fill our array of fds and watches */</font>
00555 n_fds = 0;
00556 link = _dbus_list_get_first_link (&loop->callbacks);
00557 <font class="keywordflow">while</font> (link != NULL)
00558 {
00559 <a class="code" href="structDBusList.html">DBusList</a> *next = _dbus_list_get_next_link (&loop->callbacks, link);
00560 Callback *cb = link-><a class="code" href="structDBusList.html#m2">data</a>;
00561 <font class="keywordflow">if</font> (cb->type == CALLBACK_WATCH)
00562 {
00563 <font class="keywordtype">unsigned</font> <font class="keywordtype">int</font> flags;
00564 WatchCallback *wcb = WATCH_CALLBACK (cb);
00565
00566 <font class="keywordflow">if</font> (wcb->last_iteration_oom)
00567 {
00568 <font class="comment">/* we skip this one this time, but reenable it next time,</font>
00569 <font class="comment"> * and have a timeout on this iteration</font>
00570 <font class="comment"> */</font>
00571 wcb->last_iteration_oom = FALSE;
00572 oom_watch_pending = TRUE;
00573
00574 retval = TRUE; <font class="comment">/* return TRUE here to keep the loop going,</font>
00575 <font class="comment"> * since we don't know the watch is inactive</font>
00576 <font class="comment"> */</font>
00577
00578 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00579 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" skipping watch on fd %d as it was out of memory last time\n"</font>,
00580 dbus_watch_get_fd (wcb->watch));
00581 <font class="preprocessor">#endif</font>
00582 <font class="preprocessor"></font> }
00583 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (dbus_watch_get_enabled (wcb->watch))
00584 {
00585 watches_for_fds[n_fds] = wcb;
00586
00587 callback_ref (cb);
00588
00589 flags = dbus_watch_get_flags (wcb->watch);
00590
00591 fds[n_fds].<a class="code" href="structDBusPollFD.html#m0">fd</a> = dbus_watch_get_fd (wcb->watch);
00592 fds[n_fds].<a class="code" href="structDBusPollFD.html#m2">revents</a> = 0;
00593 fds[n_fds].<a class="code" href="structDBusPollFD.html#m1">events</a> = 0;
00594 <font class="keywordflow">if</font> (flags & DBUS_WATCH_READABLE)
00595 fds[n_fds].<a class="code" href="structDBusPollFD.html#m1">events</a> |= _DBUS_POLLIN;
00596 <font class="keywordflow">if</font> (flags & DBUS_WATCH_WRITABLE)
00597 fds[n_fds].<a class="code" href="structDBusPollFD.html#m1">events</a> |= _DBUS_POLLOUT;
00598
00599 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00600 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" polling watch on fd %d\n"</font>, fds[n_fds].fd);
00601 <font class="preprocessor">#endif</font>
00602 <font class="preprocessor"></font>
00603 n_fds += 1;
00604 }
00605 <font class="keywordflow">else</font>
00606 {
00607 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00608 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" skipping disabled watch on fd %d\n"</font>,
00609 dbus_watch_get_fd (wcb->watch));
00610 <font class="preprocessor">#endif</font>
00611 <font class="preprocessor"></font> }
00612 }
00613
00614 link = next;
00615 }
00616
00617 timeout = -1;
00618 <font class="keywordflow">if</font> (loop->timeout_count > 0)
00619 {
00620 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> tv_sec;
00621 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> tv_usec;
00622
00623 _dbus_get_current_time (&tv_sec, &tv_usec);
00624
00625 link = _dbus_list_get_first_link (&loop->callbacks);
00626 <font class="keywordflow">while</font> (link != NULL)
00627 {
00628 <a class="code" href="structDBusList.html">DBusList</a> *next = _dbus_list_get_next_link (&loop->callbacks, link);
00629 Callback *cb = link-><a class="code" href="structDBusList.html#m2">data</a>;
00630
00631 <font class="keywordflow">if</font> (cb->type == CALLBACK_TIMEOUT &&
00632 dbus_timeout_get_enabled (TIMEOUT_CALLBACK (cb)->timeout))
00633 {
00634 TimeoutCallback *tcb = TIMEOUT_CALLBACK (cb);
00635 <font class="keywordtype">int</font> msecs_remaining;
00636
00637 check_timeout (tv_sec, tv_usec, tcb, &msecs_remaining);
00638
00639 <font class="keywordflow">if</font> (timeout < 0)
00640 timeout = msecs_remaining;
00641 <font class="keywordflow">else</font>
00642 timeout = MIN (msecs_remaining, timeout);
00643
00644 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00645 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" timeout added, %d remaining, aggregate timeout %ld\n"</font>,
00646 msecs_remaining, timeout);
00647 <font class="preprocessor">#endif</font>
00648 <font class="preprocessor"></font>
00649 _dbus_assert (timeout >= 0);
00650
00651 <font class="keywordflow">if</font> (timeout == 0)
00652 <font class="keywordflow">break</font>; <font class="comment">/* it's not going to get shorter... */</font>
00653 }
00654 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00655 <font class="preprocessor"></font> <font class="keywordflow">else</font> <font class="keywordflow">if</font> (cb->type == CALLBACK_TIMEOUT)
00656 {
00657 _dbus_verbose (<font class="stringliteral">" skipping disabled timeout\n"</font>);
00658 }
00659 <font class="preprocessor">#endif</font>
00660 <font class="preprocessor"></font>
00661 link = next;
00662 }
00663 }
00664
00665 <font class="comment">/* Never block if we have stuff to dispatch */</font>
00666 <font class="keywordflow">if</font> (!block || loop->need_dispatch != NULL)
00667 {
00668 timeout = 0;
00669 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00670 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" timeout is 0 as we aren't blocking\n"</font>);
00671 <font class="preprocessor">#endif</font>
00672 <font class="preprocessor"></font> }
00673
00674 <font class="comment">/* if a watch is OOM, don't wait longer than the OOM</font>
00675 <font class="comment"> * wait to re-enable it</font>
00676 <font class="comment"> */</font>
00677 <font class="keywordflow">if</font> (oom_watch_pending)
00678 timeout = MIN (timeout, _dbus_get_oom_wait ());
00679
00680 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00681 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" polling on %d descriptors timeout %ld\n"</font>, n_fds, timeout);
00682 <font class="preprocessor">#endif</font>
00683 <font class="preprocessor"></font>
00684 n_ready = _dbus_poll (fds, n_fds, timeout);
00685
00686 initial_serial = loop->callback_list_serial;
00687
00688 <font class="keywordflow">if</font> (loop->timeout_count > 0)
00689 {
00690 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> tv_sec;
00691 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> tv_usec;
00692
00693 _dbus_get_current_time (&tv_sec, &tv_usec);
00694
00695 <font class="comment">/* It'd be nice to avoid this O(n) thingy here */</font>
00696 link = _dbus_list_get_first_link (&loop->callbacks);
00697 <font class="keywordflow">while</font> (link != NULL)
00698 {
00699 <a class="code" href="structDBusList.html">DBusList</a> *next = _dbus_list_get_next_link (&loop->callbacks, link);
00700 Callback *cb = link-><a class="code" href="structDBusList.html#m2">data</a>;
00701
00702 <font class="keywordflow">if</font> (initial_serial != loop->callback_list_serial)
00703 <font class="keywordflow">goto</font> next_iteration;
00704
00705 <font class="keywordflow">if</font> (loop->depth != orig_depth)
00706 <font class="keywordflow">goto</font> next_iteration;
00707
00708 <font class="keywordflow">if</font> (cb->type == CALLBACK_TIMEOUT &&
00709 dbus_timeout_get_enabled (TIMEOUT_CALLBACK (cb)->timeout))
00710 {
00711 TimeoutCallback *tcb = TIMEOUT_CALLBACK (cb);
00712 <font class="keywordtype">int</font> msecs_remaining;
00713
00714 <font class="keywordflow">if</font> (check_timeout (tv_sec, tv_usec,
00715 tcb, &msecs_remaining))
00716 {
00717 <font class="comment">/* Save last callback time and fire this timeout */</font>
00718 tcb->last_tv_sec = tv_sec;
00719 tcb->last_tv_usec = tv_usec;
00720
00721 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00722 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" invoking timeout\n"</font>);
00723 <font class="preprocessor">#endif</font>
00724 <font class="preprocessor"></font>
00725 (* tcb->function) (tcb->timeout,
00726 cb->data);
00727
00728 retval = TRUE;
00729 }
00730 <font class="keywordflow">else</font>
00731 {
00732 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00733 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" timeout has not expired\n"</font>);
00734 <font class="preprocessor">#endif</font>
00735 <font class="preprocessor"></font> }
00736 }
00737 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00738 <font class="preprocessor"></font> <font class="keywordflow">else</font> <font class="keywordflow">if</font> (cb->type == CALLBACK_TIMEOUT)
00739 {
00740 _dbus_verbose (<font class="stringliteral">" skipping invocation of disabled timeout\n"</font>);
00741 }
00742 <font class="preprocessor">#endif</font>
00743 <font class="preprocessor"></font>
00744 link = next;
00745 }
00746 }
00747
00748 <font class="keywordflow">if</font> (n_ready > 0)
00749 {
00750 i = 0;
00751 <font class="keywordflow">while</font> (i < n_fds)
00752 {
00753 <font class="comment">/* FIXME I think this "restart if we change the watches"</font>
00754 <font class="comment"> * approach could result in starving watches</font>
00755 <font class="comment"> * toward the end of the list.</font>
00756 <font class="comment"> */</font>
00757 <font class="keywordflow">if</font> (initial_serial != loop->callback_list_serial)
00758 <font class="keywordflow">goto</font> next_iteration;
00759
00760 <font class="keywordflow">if</font> (loop->depth != orig_depth)
00761 <font class="keywordflow">goto</font> next_iteration;
00762
00763 <font class="keywordflow">if</font> (fds[i].<a class="code" href="structDBusPollFD.html#m2">revents</a> != 0)
00764 {
00765 WatchCallback *wcb;
00766 <font class="keywordtype">unsigned</font> <font class="keywordtype">int</font> condition;
00767
00768 wcb = watches_for_fds[i];
00769
00770 condition = 0;
00771 <font class="keywordflow">if</font> (fds[i].<a class="code" href="structDBusPollFD.html#m2">revents</a> & _DBUS_POLLIN)
00772 condition |= DBUS_WATCH_READABLE;
00773 <font class="keywordflow">if</font> (fds[i].<a class="code" href="structDBusPollFD.html#m2">revents</a> & _DBUS_POLLOUT)
00774 condition |= DBUS_WATCH_WRITABLE;
00775 <font class="keywordflow">if</font> (fds[i].<a class="code" href="structDBusPollFD.html#m2">revents</a> & _DBUS_POLLHUP)
00776 condition |= DBUS_WATCH_HANGUP;
00777 <font class="keywordflow">if</font> (fds[i].<a class="code" href="structDBusPollFD.html#m2">revents</a> & _DBUS_POLLERR)
00778 condition |= DBUS_WATCH_ERROR;
00779
00780 <font class="comment">/* condition may still be 0 if we got some</font>
00781 <font class="comment"> * weird POLLFOO thing like POLLWRBAND</font>
00782 <font class="comment"> */</font>
00783
00784 <font class="keywordflow">if</font> (condition != 0 &&
00785 dbus_watch_get_enabled (wcb->watch))
00786 {
00787 <font class="keywordflow">if</font> (!(* wcb->function) (wcb->watch,
00788 condition,
00789 ((Callback*)wcb)->data))
00790 wcb->last_iteration_oom = TRUE;
00791
00792 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00793 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" Invoked watch, oom = %d\n"</font>,
00794 wcb->last_iteration_oom);
00795 <font class="preprocessor">#endif</font>
00796 <font class="preprocessor"></font>
00797 retval = TRUE;
00798 }
00799 }
00800
00801 ++i;
00802 }
00803 }
00804
00805 next_iteration:
00806 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00807 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">" moving to next iteration\n"</font>);
00808 <font class="preprocessor">#endif</font>
00809 <font class="preprocessor"></font>
00810 <font class="keywordflow">if</font> (fds && fds != stack_fds)
00811 dbus_free (fds);
00812 <font class="keywordflow">if</font> (watches_for_fds)
00813 {
00814 i = 0;
00815 <font class="keywordflow">while</font> (i < n_fds)
00816 {
00817 callback_unref (&watches_for_fds[i]->callback);
00818 ++i;
00819 }
00820
00821 <font class="keywordflow">if</font> (watches_for_fds != stack_watches_for_fds)
00822 dbus_free (watches_for_fds);
00823 }
00824
00825 <font class="keywordflow">if</font> (_dbus_loop_dispatch (loop))
00826 retval = TRUE;
00827
00828 <font class="preprocessor">#if MAINLOOP_SPEW</font>
00829 <font class="preprocessor"></font> _dbus_verbose (<font class="stringliteral">"Returning %d\n"</font>, retval);
00830 <font class="preprocessor">#endif</font>
00831 <font class="preprocessor"></font>
00832 <font class="keywordflow">return</font> retval;
00833 }
00834
00835 <font class="keywordtype">void</font>
00836 _dbus_loop_run (DBusLoop *loop)
00837 {
00838 <font class="keywordtype">int</font> our_exit_depth;
00839
00840 _dbus_assert (loop->depth >= 0);
00841
00842 _dbus_loop_ref (loop);
00843
00844 our_exit_depth = loop->depth;
00845 loop->depth += 1;
00846
00847 _dbus_verbose (<font class="stringliteral">"Running main loop, depth %d -> %d\n"</font>,
00848 loop->depth - 1, loop->depth);
00849
00850 <font class="keywordflow">while</font> (loop->depth != our_exit_depth)
00851 _dbus_loop_iterate (loop, TRUE);
00852
00853 _dbus_loop_unref (loop);
00854 }
00855
00856 <font class="keywordtype">void</font>
00857 _dbus_loop_quit (DBusLoop *loop)
00858 {
00859 _dbus_assert (loop->depth > 0);
00860
00861 loop->depth -= 1;
00862
00863 _dbus_verbose (<font class="stringliteral">"Quit main loop, depth %d -> %d\n"</font>,
00864 loop->depth + 1, loop->depth);
00865 }
00866
00867 <font class="keywordtype">int</font>
00868 _dbus_get_oom_wait (<font class="keywordtype">void</font>)
00869 {
00870 <font class="preprocessor">#ifdef DBUS_BUILD_TESTS</font>
00871 <font class="preprocessor"></font> <font class="comment">/* make tests go fast */</font>
00872 <font class="keywordflow">return</font> 0;
00873 <font class="preprocessor">#else</font>
00874 <font class="preprocessor"></font> <font class="keywordflow">return</font> 500;
00875 <font class="preprocessor">#endif</font>
00876 <font class="preprocessor"></font>}
00877
00878 <font class="keywordtype">void</font>
00879 _dbus_wait_for_memory (<font class="keywordtype">void</font>)
00880 {
00881 _dbus_verbose (<font class="stringliteral">"Waiting for more memory\n"</font>);
00882 _dbus_sleep_milliseconds (_dbus_get_oom_wait ());
00883 }
00884
00885 <font class="preprocessor">#endif </font><font class="comment">/* DOXYGEN_SHOULD_SKIP_THIS */</font>
</pre></div><hr><address align="right"><small>Generated on Wed Jun 9 05:01:25 2004 for D-BUS by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border=0
width=110 height=53></a>1.2.15 </small></address>
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distrib
>
Mandriva
>
2007.0
>
x86_64
>
media
>
main-release
>
by-pkgid
>
926d2d1e3111287cee1b0a4fad4fb4f6
>
files
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91
