libev/event.c

/*
 * libevent compatibility layer
 *
 * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 * 
 *   1.  Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 * 
 *   2.  Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

#include <stddef.h>
#include <stdlib.h>
#include <assert.h>

#ifdef EV_EVENT_H
# include EV_EVENT_H
#else
# include "event.h"
#endif

#if EV_MULTIPLICITY
# define dLOOPev struct ev_loop *loop = (struct ev_loop *)ev->ev_base
# define dLOOPbase struct ev_loop *loop = (struct ev_loop *)base
#else
# define dLOOPev
# define dLOOPbase
#endif

/* never accessed, will always be cast from/to ev_loop */
struct event_base
{
  int dummy;
};

static struct event_base *ev_x_cur;

static ev_tstamp
ev_tv_get (struct timeval *tv)
{
  if (tv)
    {
      ev_tstamp after = tv->tv_sec + tv->tv_usec * 1e-6;
      return after ? after : 1e-6;
    }
  else
    return -1.;
}

#define EVENT_STRINGIFY(s) # s
#define EVENT_VERSION(a,b) EVENT_STRINGIFY (a) "." EVENT_STRINGIFY (b)

const char *event_get_version (void)
{
  /* returns ABI, not API or library, version */
  return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
}

const char *event_get_method (void)
{
  return "libev";
}

void *event_init (void)
{
#if EV_MULTIPLICITY
  if (ev_x_cur)
    ev_x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO);
  else
    ev_x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO);
#else
  assert (("libev: multiple event bases not supported when not compiled with EV_MULTIPLICITY", !ev_x_cur));

  ev_x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO);
#endif

  return ev_x_cur;
}

void event_base_free (struct event_base *base)
{
  dLOOPbase;

#if EV_MULTIPLICITY
  if (ev_default_loop (EVFLAG_AUTO) != loop)
    ev_loop_destroy (loop);
#endif
}

int event_dispatch (void)
{
  return event_base_dispatch (ev_x_cur);
}

#ifdef EV_STANDALONE
void event_set_log_callback (event_log_cb cb)
{
  /* nop */
}
#endif

int event_loop (int flags)
{
  return event_base_loop (ev_x_cur, flags);
}

int event_loopexit (struct timeval *tv)
{
  return event_base_loopexit (ev_x_cur, tv);
}

static void
ev_x_cb (struct event *ev, int revents)
{
  revents &= EV_READ | EV_WRITE | EV_TIMER | EV_SIGNAL;

  ev->ev_res = revents;
  ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg);
}

static void
ev_x_cb_sig (EV_P_ struct ev_signal *w, int revents)
{
  struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.sig));

  if (revents & EV_ERROR)
    event_del (ev);

  ev_x_cb (ev, revents);
}

static void
ev_x_cb_io (EV_P_ struct ev_io *w, int revents)
{
  struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.io));

  if ((revents & EV_ERROR) || !(ev->ev_events & EV_PERSIST))
    event_del (ev);

  ev_x_cb (ev, revents);
}

static void
ev_x_cb_to (EV_P_ struct ev_timer *w, int revents)
{
  struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, to));

  event_del (ev);

  ev_x_cb (ev, revents);
}

void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg)
{
  if (events & EV_SIGNAL)
    ev_init (&ev->iosig.sig, ev_x_cb_sig);
  else
    ev_init (&ev->iosig.io, ev_x_cb_io);

  ev_init (&ev->to, ev_x_cb_to);

  ev->ev_base     = ev_x_cur; /* not threadsafe, but it's how libevent works */
  ev->ev_fd       = fd;
  ev->ev_events   = events;
  ev->ev_pri      = 0;
  ev->ev_callback = cb;
  ev->ev_arg      = arg;
  ev->ev_res      = 0;
  ev->ev_flags    = EVLIST_INIT;
}

int event_once (int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
{
  return event_base_once (ev_x_cur, fd, events, cb, arg, tv);
}

int event_add (struct event *ev, struct timeval *tv)
{
  dLOOPev;

  if (ev->ev_events & EV_SIGNAL)
    {
      if (!ev_is_active (&ev->iosig.sig))
        {
          ev_signal_set (&ev->iosig.sig, ev->ev_fd);
          ev_signal_start (EV_A_ &ev->iosig.sig);

          ev->ev_flags |= EVLIST_SIGNAL;
        }
    }
  else if (ev->ev_events & (EV_READ | EV_WRITE))
    {
      if (!ev_is_active (&ev->iosig.io))
        {
          ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ | EV_WRITE));
          ev_io_start (EV_A_ &ev->iosig.io);

          ev->ev_flags |= EVLIST_INSERTED;
        }
    }

  if (tv)
    {
      ev->to.repeat = ev_tv_get (tv);
      ev_timer_again (EV_A_ &ev->to);
      ev->ev_flags |= EVLIST_TIMEOUT;
    }
  else
    {
      ev_timer_stop (EV_A_ &ev->to);
      ev->ev_flags &= ~EVLIST_TIMEOUT;
    }

  ev->ev_flags |= EVLIST_ACTIVE;

  return 0;
}

int event_del (struct event *ev)
{
  dLOOPev;

  if (ev->ev_events & EV_SIGNAL)
    ev_signal_stop (EV_A_ &ev->iosig.sig);
  else if (ev->ev_events & (EV_READ | EV_WRITE))
    ev_io_stop (EV_A_ &ev->iosig.io);

  if (ev_is_active (&ev->to))
    ev_timer_stop (EV_A_ &ev->to);

  ev->ev_flags = EVLIST_INIT;

  return 0;
}

void event_active (struct event *ev, int res, short ncalls)
{
  dLOOPev;

  if (res & EV_TIMEOUT)
    ev_feed_event (EV_A_ &ev->to, res & EV_TIMEOUT);

  if (res & EV_SIGNAL)
    ev_feed_event (EV_A_ &ev->iosig.sig, res & EV_SIGNAL);

  if (res & (EV_READ | EV_WRITE))
    ev_feed_event (EV_A_ &ev->iosig.io, res & (EV_READ | EV_WRITE));
}

int event_pending (struct event *ev, short events, struct timeval *tv)
{
  short revents = 0;
  dLOOPev;

  if (ev->ev_events & EV_SIGNAL)
    {
      /* sig */
      if (ev_is_active (&ev->iosig.sig) || ev_is_pending (&ev->iosig.sig))
        revents |= EV_SIGNAL;
    }
  else if (ev->ev_events & (EV_READ | EV_WRITE))
    {
      /* io */
      if (ev_is_active (&ev->iosig.io) || ev_is_pending (&ev->iosig.io))
        revents |= ev->ev_events & (EV_READ | EV_WRITE);
    }

  if (ev->ev_events & EV_TIMEOUT || ev_is_active (&ev->to) || ev_is_pending (&ev->to))
    {
      revents |= EV_TIMEOUT;

      if (tv)
        {
          ev_tstamp at = ev_now (EV_A);

          tv->tv_sec  = (long)at;
          tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
        }
    }

  return events & revents;
}

int event_priority_init (int npri)
{
  return event_base_priority_init (ev_x_cur, npri);
}

int event_priority_set (struct event *ev, int pri)
{
  ev->ev_pri = pri;

  return 0;
}

int event_base_set (struct event_base *base, struct event *ev)
{
  ev->ev_base = base;

  return 0;
}

int event_base_loop (struct event_base *base, int flags)
{
  dLOOPbase;

  ev_run (EV_A_ flags);

  return 0;
}

int event_base_dispatch (struct event_base *base)
{
  return event_base_loop (base, 0);
}

static void
ev_x_loopexit_cb (int revents, void *base)
{
  dLOOPbase;

  ev_break (EV_A_ EVBREAK_ONE);
}

int event_base_loopexit (struct event_base *base, struct timeval *tv)
{
  ev_tstamp after = ev_tv_get (tv);
  dLOOPbase;

  ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., ev_x_loopexit_cb, (void *)base);

  return 0;
}

struct ev_x_once
{
  int fd;
  void (*cb)(int, short, void *);
  void *arg;
};

static void
ev_x_once_cb (int revents, void *arg)
{
  struct ev_x_once *once = (struct ev_x_once *)arg;

  once->cb (once->fd, (short)revents, once->arg);
  free (once);
}

int event_base_once (struct event_base *base, int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
{
  struct ev_x_once *once = (struct ev_x_once *)malloc (sizeof (struct ev_x_once));
  dLOOPbase;

  if (!once)
    return -1;

  once->fd  = fd;
  once->cb  = cb;
  once->arg = arg;

  ev_once (EV_A_ fd, events & (EV_READ | EV_WRITE), ev_tv_get (tv), ev_x_once_cb, (void *)once);

  return 0;
}

int event_base_priority_init (struct event_base *base, int npri)
{
  /*dLOOPbase;*/

  return 0;
}

Revision:	1.47
Committed:	Sun Oct 24 17:25:33 2010 UTC (15 years, 3 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-4_01, rel-4_00
Changes since 1.46:	+6 -4 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* libevent compatibility layer
3	*
4	* Copyright (c) 2007,2008,2009,2010 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	#ifdef EV_EVENT_H
45	# include EV_EVENT_H
46	#else
47	# include "event.h"
48	#endif
49
50	#if EV_MULTIPLICITY
51	# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
52	# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
53	#else
54	# define dLOOPev
55	# define dLOOPbase
56	#endif
57
58	/* never accessed, will always be cast from/to ev_loop */
59	struct event_base
60	{
61	int dummy;
62	};
63
64	static struct event_base *ev_x_cur;
65
66	static ev_tstamp
67	ev_tv_get (struct timeval *tv)
68	{
69	if (tv)
70	{
71	ev_tstamp after = tv->tv_sec + tv->tv_usec * 1e-6;
72	return after ? after : 1e-6;
73	}
74	else
75	return -1.;
76	}
77
78	#define EVENT_STRINGIFY(s) # s
79	#define EVENT_VERSION(a,b) EVENT_STRINGIFY (a) "." EVENT_STRINGIFY (b)
80
81	const char *event_get_version (void)
82	{
83	/* returns ABI, not API or library, version */
84	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
85	}
86
87	const char *event_get_method (void)
88	{
89	return "libev";
90	}
91
92	void *event_init (void)
93	{
94	#if EV_MULTIPLICITY
95	if (ev_x_cur)
96	ev_x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO);
97	else
98	ev_x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO);
99	#else
100	assert (("libev: multiple event bases not supported when not compiled with EV_MULTIPLICITY", !ev_x_cur));
101
102	ev_x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO);
103	#endif
104
105	return ev_x_cur;
106	}
107
108	void event_base_free (struct event_base *base)
109	{
110	dLOOPbase;
111
112	#if EV_MULTIPLICITY
113	if (ev_default_loop (EVFLAG_AUTO) != loop)
114	ev_loop_destroy (loop);
115	#endif
116	}
117
118	int event_dispatch (void)
119	{
120	return event_base_dispatch (ev_x_cur);
121	}
122
123	#ifdef EV_STANDALONE
124	void event_set_log_callback (event_log_cb cb)
125	{
126	/* nop */
127	}
128	#endif
129
130	int event_loop (int flags)
131	{
132	return event_base_loop (ev_x_cur, flags);
133	}
134
135	int event_loopexit (struct timeval *tv)
136	{
137	return event_base_loopexit (ev_x_cur, tv);
138	}
139
140	static void
141	ev_x_cb (struct event *ev, int revents)
142	{
143	revents &= EV_READ \| EV_WRITE \| EV_TIMER \| EV_SIGNAL;
144
145	ev->ev_res = revents;
146	ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg);
147	}
148
149	static void
150	ev_x_cb_sig (EV_P_ struct ev_signal *w, int revents)
151	{
152	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.sig));
153
154	if (revents & EV_ERROR)
155	event_del (ev);
156
157	ev_x_cb (ev, revents);
158	}
159
160	static void
161	ev_x_cb_io (EV_P_ struct ev_io *w, int revents)
162	{
163	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
164
165	if ((revents & EV_ERROR) \|\| !(ev->ev_events & EV_PERSIST))
166	event_del (ev);
167
168	ev_x_cb (ev, revents);
169	}
170
171	static void
172	ev_x_cb_to (EV_P_ struct ev_timer *w, int revents)
173	{
174	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
175
176	event_del (ev);
177
178	ev_x_cb (ev, revents);
179	}
180
181	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
182	{
183	if (events & EV_SIGNAL)
184	ev_init (&ev->iosig.sig, ev_x_cb_sig);
185	else
186	ev_init (&ev->iosig.io, ev_x_cb_io);
187
188	ev_init (&ev->to, ev_x_cb_to);
189
190	ev->ev_base = ev_x_cur; /* not threadsafe, but it's how libevent works */
191	ev->ev_fd = fd;
192	ev->ev_events = events;
193	ev->ev_pri = 0;
194	ev->ev_callback = cb;
195	ev->ev_arg = arg;
196	ev->ev_res = 0;
197	ev->ev_flags = EVLIST_INIT;
198	}
199
200	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
201	{
202	return event_base_once (ev_x_cur, fd, events, cb, arg, tv);
203	}
204
205	int event_add (struct event ev, struct timeval tv)
206	{
207	dLOOPev;
208
209	if (ev->ev_events & EV_SIGNAL)
210	{
211	if (!ev_is_active (&ev->iosig.sig))
212	{
213	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
214	ev_signal_start (EV_A_ &ev->iosig.sig);
215
216	ev->ev_flags \|= EVLIST_SIGNAL;
217	}
218	}
219	else if (ev->ev_events & (EV_READ \| EV_WRITE))
220	{
221	if (!ev_is_active (&ev->iosig.io))
222	{
223	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
224	ev_io_start (EV_A_ &ev->iosig.io);
225
226	ev->ev_flags \|= EVLIST_INSERTED;
227	}
228	}
229
230	if (tv)
231	{
232	ev->to.repeat = ev_tv_get (tv);
233	ev_timer_again (EV_A_ &ev->to);
234	ev->ev_flags \|= EVLIST_TIMEOUT;
235	}
236	else
237	{
238	ev_timer_stop (EV_A_ &ev->to);
239	ev->ev_flags &= ~EVLIST_TIMEOUT;
240	}
241
242	ev->ev_flags \|= EVLIST_ACTIVE;
243
244	return 0;
245	}
246
247	int event_del (struct event *ev)
248	{
249	dLOOPev;
250
251	if (ev->ev_events & EV_SIGNAL)
252	ev_signal_stop (EV_A_ &ev->iosig.sig);
253	else if (ev->ev_events & (EV_READ \| EV_WRITE))
254	ev_io_stop (EV_A_ &ev->iosig.io);
255
256	if (ev_is_active (&ev->to))
257	ev_timer_stop (EV_A_ &ev->to);
258
259	ev->ev_flags = EVLIST_INIT;
260
261	return 0;
262	}
263
264	void event_active (struct event *ev, int res, short ncalls)
265	{
266	dLOOPev;
267
268	if (res & EV_TIMEOUT)
269	ev_feed_event (EV_A_ &ev->to, res & EV_TIMEOUT);
270
271	if (res & EV_SIGNAL)
272	ev_feed_event (EV_A_ &ev->iosig.sig, res & EV_SIGNAL);
273
274	if (res & (EV_READ \| EV_WRITE))
275	ev_feed_event (EV_A_ &ev->iosig.io, res & (EV_READ \| EV_WRITE));
276	}
277
278	int event_pending (struct event ev, short events, struct timeval tv)
279	{
280	short revents = 0;
281	dLOOPev;
282
283	if (ev->ev_events & EV_SIGNAL)
284	{
285	/* sig */
286	if (ev_is_active (&ev->iosig.sig) \|\| ev_is_pending (&ev->iosig.sig))
287	revents \|= EV_SIGNAL;
288	}
289	else if (ev->ev_events & (EV_READ \| EV_WRITE))
290	{
291	/* io */
292	if (ev_is_active (&ev->iosig.io) \|\| ev_is_pending (&ev->iosig.io))
293	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
294	}
295
296	if (ev->ev_events & EV_TIMEOUT \|\| ev_is_active (&ev->to) \|\| ev_is_pending (&ev->to))
297	{
298	revents \|= EV_TIMEOUT;
299
300	if (tv)
301	{
302	ev_tstamp at = ev_now (EV_A);
303
304	tv->tv_sec = (long)at;
305	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
306	}
307	}
308
309	return events & revents;
310	}
311
312	int event_priority_init (int npri)
313	{
314	return event_base_priority_init (ev_x_cur, npri);
315	}
316
317	int event_priority_set (struct event *ev, int pri)
318	{
319	ev->ev_pri = pri;
320
321	return 0;
322	}
323
324	int event_base_set (struct event_base base, struct event ev)
325	{
326	ev->ev_base = base;
327
328	return 0;
329	}
330
331	int event_base_loop (struct event_base *base, int flags)
332	{
333	dLOOPbase;
334
335	ev_run (EV_A_ flags);
336
337	return 0;
338	}
339
340	int event_base_dispatch (struct event_base *base)
341	{
342	return event_base_loop (base, 0);
343	}
344
345	static void
346	ev_x_loopexit_cb (int revents, void *base)
347	{
348	dLOOPbase;
349
350	ev_break (EV_A_ EVBREAK_ONE);
351	}
352
353	int event_base_loopexit (struct event_base base, struct timeval tv)
354	{
355	ev_tstamp after = ev_tv_get (tv);
356	dLOOPbase;
357
358	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., ev_x_loopexit_cb, (void *)base);
359
360	return 0;
361	}
362
363	struct ev_x_once
364	{
365	int fd;
366	void (cb)(int, short, void );
367	void *arg;
368	};
369
370	static void
371	ev_x_once_cb (int revents, void *arg)
372	{
373	struct ev_x_once once = (struct ev_x_once )arg;
374
375	once->cb (once->fd, (short)revents, once->arg);
376	free (once);
377	}
378
379	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
380	{
381	struct ev_x_once once = (struct ev_x_once )malloc (sizeof (struct ev_x_once));
382	dLOOPbase;
383
384	if (!once)
385	return -1;
386
387	once->fd = fd;
388	once->cb = cb;
389	once->arg = arg;
390
391	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), ev_tv_get (tv), ev_x_once_cb, (void *)once);
392
393	return 0;
394	}
395
396	int event_base_priority_init (struct event_base *base, int npri)
397	{
398	/dLOOPbase;/
399
400	return 0;
401	}
402