libev/event.c

/*
 * libevent compatibility layer
 *
 * Copyright (c) 2007,2008,2009 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 void
ev_tv_set (struct timeval *tv, ev_tstamp at)
{
  tv->tv_sec  = (long)at;
  tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
}

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_TIMEOUT | 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_tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
    }

  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_loop (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_unloop (EV_A_ EVUNLOOP_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:	1.42
Committed:	Mon May 10 20:01:45 2010 UTC (14 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.41:	+4 -1 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* libevent compatibility layer
3	*
4	* Copyright (c) 2007,2008,2009 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 void
67	ev_tv_set (struct timeval *tv, ev_tstamp at)
68	{
69	tv->tv_sec = (long)at;
70	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
71	}
72
73	static ev_tstamp
74	ev_tv_get (struct timeval *tv)
75	{
76	if (tv)
77	{
78	ev_tstamp after = tv->tv_sec + tv->tv_usec * 1e-6;
79	return after ? after : 1e-6;
80	}
81	else
82	return -1.;
83	}
84
85	#define EVENT_STRINGIFY(s) # s
86	#define EVENT_VERSION(a,b) EVENT_STRINGIFY (a) "." EVENT_STRINGIFY (b)
87
88	const char *event_get_version (void)
89	{
90	/* returns ABI, not API or library, version */
91	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
92	}
93
94	const char *event_get_method (void)
95	{
96	return "libev";
97	}
98
99	void *event_init (void)
100	{
101	#if EV_MULTIPLICITY
102	if (ev_x_cur)
103	ev_x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO);
104	else
105	ev_x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO);
106	#else
107	assert (("libev: multiple event bases not supported when not compiled with EV_MULTIPLICITY", !ev_x_cur));
108
109	ev_x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO);
110	#endif
111
112	return ev_x_cur;
113	}
114
115	void event_base_free (struct event_base *base)
116	{
117	dLOOPbase;
118
119	#if EV_MULTIPLICITY
120	if (ev_default_loop (EVFLAG_AUTO) != loop)
121	ev_loop_destroy (loop);
122	#endif
123	}
124
125	int event_dispatch (void)
126	{
127	return event_base_dispatch (ev_x_cur);
128	}
129
130	#ifdef EV_STANDALONE
131	void event_set_log_callback (event_log_cb cb)
132	{
133	/* nop */
134	}
135	#endif
136
137	int event_loop (int flags)
138	{
139	return event_base_loop (ev_x_cur, flags);
140	}
141
142	int event_loopexit (struct timeval *tv)
143	{
144	return event_base_loopexit (ev_x_cur, tv);
145	}
146
147	static void
148	ev_x_cb (struct event *ev, int revents)
149	{
150	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
151
152	ev->ev_res = revents;
153	ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg);
154	}
155
156	static void
157	ev_x_cb_sig (EV_P_ struct ev_signal *w, int revents)
158	{
159	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.sig));
160
161	if (revents & EV_ERROR)
162	event_del (ev);
163
164	ev_x_cb (ev, revents);
165	}
166
167	static void
168	ev_x_cb_io (EV_P_ struct ev_io *w, int revents)
169	{
170	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
171
172	if ((revents & EV_ERROR) \|\| !(ev->ev_events & EV_PERSIST))
173	event_del (ev);
174
175	ev_x_cb (ev, revents);
176	}
177
178	static void
179	ev_x_cb_to (EV_P_ struct ev_timer *w, int revents)
180	{
181	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
182
183	event_del (ev);
184
185	ev_x_cb (ev, revents);
186	}
187
188	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
189	{
190	if (events & EV_SIGNAL)
191	ev_init (&ev->iosig.sig, ev_x_cb_sig);
192	else
193	ev_init (&ev->iosig.io, ev_x_cb_io);
194
195	ev_init (&ev->to, ev_x_cb_to);
196
197	ev->ev_base = ev_x_cur; /* not threadsafe, but it's how libevent works */
198	ev->ev_fd = fd;
199	ev->ev_events = events;
200	ev->ev_pri = 0;
201	ev->ev_callback = cb;
202	ev->ev_arg = arg;
203	ev->ev_res = 0;
204	ev->ev_flags = EVLIST_INIT;
205	}
206
207	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
208	{
209	return event_base_once (ev_x_cur, fd, events, cb, arg, tv);
210	}
211
212	int event_add (struct event ev, struct timeval tv)
213	{
214	dLOOPev;
215
216	if (ev->ev_events & EV_SIGNAL)
217	{
218	if (!ev_is_active (&ev->iosig.sig))
219	{
220	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
221	ev_signal_start (EV_A_ &ev->iosig.sig);
222
223	ev->ev_flags \|= EVLIST_SIGNAL;
224	}
225	}
226	else if (ev->ev_events & (EV_READ \| EV_WRITE))
227	{
228	if (!ev_is_active (&ev->iosig.io))
229	{
230	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
231	ev_io_start (EV_A_ &ev->iosig.io);
232
233	ev->ev_flags \|= EVLIST_INSERTED;
234	}
235	}
236
237	if (tv)
238	{
239	ev->to.repeat = ev_tv_get (tv);
240	ev_timer_again (EV_A_ &ev->to);
241	ev->ev_flags \|= EVLIST_TIMEOUT;
242	}
243	else
244	{
245	ev_timer_stop (EV_A_ &ev->to);
246	ev->ev_flags &= ~EVLIST_TIMEOUT;
247	}
248
249	ev->ev_flags \|= EVLIST_ACTIVE;
250
251	return 0;
252	}
253
254	int event_del (struct event *ev)
255	{
256	dLOOPev;
257
258	if (ev->ev_events & EV_SIGNAL)
259	ev_signal_stop (EV_A_ &ev->iosig.sig);
260	else if (ev->ev_events & (EV_READ \| EV_WRITE))
261	ev_io_stop (EV_A_ &ev->iosig.io);
262
263	if (ev_is_active (&ev->to))
264	ev_timer_stop (EV_A_ &ev->to);
265
266	ev->ev_flags = EVLIST_INIT;
267
268	return 0;
269	}
270
271	void event_active (struct event *ev, int res, short ncalls)
272	{
273	dLOOPev;
274
275	if (res & EV_TIMEOUT)
276	ev_feed_event (EV_A_ &ev->to, res & EV_TIMEOUT);
277
278	if (res & EV_SIGNAL)
279	ev_feed_event (EV_A_ &ev->iosig.sig, res & EV_SIGNAL);
280
281	if (res & (EV_READ \| EV_WRITE))
282	ev_feed_event (EV_A_ &ev->iosig.io, res & (EV_READ \| EV_WRITE));
283	}
284
285	int event_pending (struct event ev, short events, struct timeval tv)
286	{
287	short revents = 0;
288	dLOOPev;
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	ev_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 (ev_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	ev_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 = ev_tv_get (tv);
358	dLOOPbase;
359
360	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., ev_x_loopexit_cb, (void *)base);
361
362	return 0;
363	}
364
365	struct ev_x_once
366	{
367	int fd;
368	void (cb)(int, short, void );
369	void *arg;
370	};
371
372	static void
373	ev_x_once_cb (int revents, void *arg)
374	{
375	struct ev_x_once once = (struct ev_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 ev_x_once once = (struct ev_x_once )malloc (sizeof (struct ev_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), ev_tv_get (tv), ev_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