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/cvs/libev/event.c
Revision: 1.34
Committed: Wed Apr 9 21:09:10 2008 UTC (16 years, 3 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-3_31, rel-3_3
Changes since 1.33: +1 -1 lines
Log Message:
*** empty log message ***

File Contents

# Content
1 /*
2 * libevent compatibility layer
3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 #include <stddef.h>
41 #include <stdlib.h>
42 #include <assert.h>
43
44 #ifndef WIN32
45 # include <sys/time.h>
46 #endif
47
48 #ifdef EV_EVENT_H
49 # include EV_EVENT_H
50 #else
51 # include "event.h"
52 #endif
53
54 #if EV_MULTIPLICITY
55 # define dLOOPev struct ev_loop *loop = (struct ev_loop *)ev->ev_base
56 # define dLOOPbase struct ev_loop *loop = (struct ev_loop *)base
57 #else
58 # define dLOOPev
59 # define dLOOPbase
60 #endif
61
62 /* never accessed, will always be cast from/to ev_loop */
63 struct event_base
64 {
65 int dummy;
66 };
67
68 static struct event_base *x_cur;
69
70 static void
71 tv_set (struct timeval *tv, ev_tstamp at)
72 {
73 tv->tv_sec = (long)at;
74 tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
75 }
76
77 static ev_tstamp
78 tv_get (struct timeval *tv)
79 {
80 if (tv)
81 return tv->tv_sec + tv->tv_usec * 1e-6;
82 else
83 return -1.;
84 }
85
86 #define EVENT_VERSION(a,b) # a "." # b
87
88 const char *event_get_version (void)
89 {
90 return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
91 }
92
93 const char *event_get_method (void)
94 {
95 return "libev";
96 }
97
98 void *event_init (void)
99 {
100 #if EV_MULTIPLICITY
101 if (x_cur)
102 x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO);
103 else
104 x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO);
105 #else
106 assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));
107
108 x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO);
109 #endif
110
111 return x_cur;
112 }
113
114 void event_base_free (struct event_base *base)
115 {
116 dLOOPbase;
117
118 #if EV_MULTIPLICITY
119 if (ev_default_loop (EVFLAG_AUTO) != loop)
120 ev_loop_destroy (loop);
121 #endif
122 }
123
124 int event_dispatch (void)
125 {
126 return event_base_dispatch (x_cur);
127 }
128
129 #ifdef EV_STANDALONE
130 void event_set_log_callback (event_log_cb cb)
131 {
132 /* nop */
133 }
134 #endif
135
136 int event_loop (int flags)
137 {
138 return event_base_loop (x_cur, flags);
139 }
140
141 int event_loopexit (struct timeval *tv)
142 {
143 return event_base_loopexit (x_cur, tv);
144 }
145
146 static void
147 x_cb (struct event *ev, int revents)
148 {
149 revents &= EV_READ | EV_WRITE | EV_TIMEOUT | EV_SIGNAL;
150
151 ev->ev_res = revents;
152 ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg);
153 }
154
155 static void
156 x_cb_sig (EV_P_ struct ev_signal *w, int revents)
157 {
158 struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.sig));
159
160 if (revents & EV_ERROR)
161 event_del (ev);
162
163 x_cb (ev, revents);
164 }
165
166 static void
167 x_cb_io (EV_P_ struct ev_io *w, int revents)
168 {
169 struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.io));
170
171 if ((revents & EV_ERROR) || !(ev->ev_events & EV_PERSIST))
172 event_del (ev);
173
174 x_cb (ev, revents);
175 }
176
177 static void
178 x_cb_to (EV_P_ struct ev_timer *w, int revents)
179 {
180 struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, to));
181
182 event_del (ev);
183
184 x_cb (ev, revents);
185 }
186
187 void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg)
188 {
189 if (events & EV_SIGNAL)
190 ev_init (&ev->iosig.sig, x_cb_sig);
191 else
192 ev_init (&ev->iosig.io, x_cb_io);
193
194 ev_init (&ev->to, x_cb_to);
195
196 ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
197 ev->ev_fd = fd;
198 ev->ev_events = events;
199 ev->ev_pri = 0;
200 ev->ev_callback = cb;
201 ev->ev_arg = arg;
202 ev->ev_res = 0;
203 ev->ev_flags = EVLIST_INIT;
204 }
205
206 int event_once (int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
207 {
208 return event_base_once (x_cur, fd, events, cb, arg, tv);
209 }
210
211 int event_add (struct event *ev, struct timeval *tv)
212 {
213 dLOOPev;
214
215 if (ev->ev_events & EV_SIGNAL)
216 {
217 if (!ev_is_active (&ev->iosig.sig))
218 {
219 ev_signal_set (&ev->iosig.sig, ev->ev_fd);
220 ev_signal_start (EV_A_ &ev->iosig.sig);
221
222 ev->ev_flags |= EVLIST_SIGNAL;
223 }
224 }
225 else if (ev->ev_events & (EV_READ | EV_WRITE))
226 {
227 if (!ev_is_active (&ev->iosig.io))
228 {
229 ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ | EV_WRITE));
230 ev_io_start (EV_A_ &ev->iosig.io);
231
232 ev->ev_flags |= EVLIST_INSERTED;
233 }
234 }
235
236 if (tv)
237 {
238 ev->to.repeat = tv_get (tv);
239 ev_timer_again (EV_A_ &ev->to);
240 ev->ev_flags |= EVLIST_TIMEOUT;
241 }
242 else
243 {
244 ev_timer_stop (EV_A_ &ev->to);
245 ev->ev_flags &= ~EVLIST_TIMEOUT;
246 }
247
248 ev->ev_flags |= EVLIST_ACTIVE;
249
250 return 0;
251 }
252
253 int event_del (struct event *ev)
254 {
255 dLOOPev;
256
257 if (ev->ev_events & EV_SIGNAL)
258 ev_signal_stop (EV_A_ &ev->iosig.sig);
259 else if (ev->ev_events & (EV_READ | EV_WRITE))
260 ev_io_stop (EV_A_ &ev->iosig.io);
261
262 if (ev_is_active (&ev->to))
263 ev_timer_stop (EV_A_ &ev->to);
264
265 ev->ev_flags = EVLIST_INIT;
266
267 return 0;
268 }
269
270 void event_active (struct event *ev, int res, short ncalls)
271 {
272 dLOOPev;
273
274 if (res & EV_TIMEOUT)
275 ev_feed_event (EV_A_ &ev->to, res & EV_TIMEOUT);
276
277 if (res & EV_SIGNAL)
278 ev_feed_event (EV_A_ &ev->iosig.sig, res & EV_SIGNAL);
279
280 if (res & (EV_READ | EV_WRITE))
281 ev_feed_event (EV_A_ &ev->iosig.io, res & (EV_READ | EV_WRITE));
282 }
283
284 int event_pending (struct event *ev, short events, struct timeval *tv)
285 {
286 short revents = 0;
287 dLOOPev;
288
289
290 if (ev->ev_events & EV_SIGNAL)
291 {
292 /* sig */
293 if (ev_is_active (&ev->iosig.sig) || ev_is_pending (&ev->iosig.sig))
294 revents |= EV_SIGNAL;
295 }
296 else if (ev->ev_events & (EV_READ | EV_WRITE))
297 {
298 /* io */
299 if (ev_is_active (&ev->iosig.io) || ev_is_pending (&ev->iosig.io))
300 revents |= ev->ev_events & (EV_READ | EV_WRITE);
301 }
302
303 if (ev->ev_events & EV_TIMEOUT || ev_is_active (&ev->to) || ev_is_pending (&ev->to))
304 {
305 revents |= EV_TIMEOUT;
306
307 if (tv)
308 tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
309 }
310
311 return events & revents;
312 }
313
314 int event_priority_init (int npri)
315 {
316 return event_base_priority_init (x_cur, npri);
317 }
318
319 int event_priority_set (struct event *ev, int pri)
320 {
321 ev->ev_pri = pri;
322
323 return 0;
324 }
325
326 int event_base_set (struct event_base *base, struct event *ev)
327 {
328 ev->ev_base = base;
329
330 return 0;
331 }
332
333 int event_base_loop (struct event_base *base, int flags)
334 {
335 dLOOPbase;
336
337 ev_loop (EV_A_ flags);
338
339 return 0;
340 }
341
342 int event_base_dispatch (struct event_base *base)
343 {
344 return event_base_loop (base, 0);
345 }
346
347 static void
348 x_loopexit_cb (int revents, void *base)
349 {
350 dLOOPbase;
351
352 ev_unloop (EV_A_ EVUNLOOP_ONE);
353 }
354
355 int event_base_loopexit (struct event_base *base, struct timeval *tv)
356 {
357 ev_tstamp after = tv_get (tv);
358 dLOOPbase;
359
360 ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
361
362 return 0;
363 }
364
365 struct x_once
366 {
367 int fd;
368 void (*cb)(int, short, void *);
369 void *arg;
370 };
371
372 static void
373 x_once_cb (int revents, void *arg)
374 {
375 struct x_once *once = (struct x_once *)arg;
376
377 once->cb (once->fd, (short)revents, once->arg);
378 free (once);
379 }
380
381 int event_base_once (struct event_base *base, int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
382 {
383 struct x_once *once = (struct x_once *)malloc (sizeof (struct x_once));
384 dLOOPbase;
385
386 if (!once)
387 return -1;
388
389 once->fd = fd;
390 once->cb = cb;
391 once->arg = arg;
392
393 ev_once (EV_A_ fd, events & (EV_READ | EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
394
395 return 0;
396 }
397
398 int event_base_priority_init (struct event_base *base, int npri)
399 {
400 /*dLOOPbase;*/
401
402 return 0;
403 }
404