libev/event.c

/*
 * libevent compatibility layer
 *
 * Copyright (c) 2007,2008 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)
    return tv->tv_sec + tv->tv_usec * 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:	1.40
Committed:	Tue Jan 6 19:57:32 2009 UTC (15 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.39:	+3 -1 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* libevent compatibility layer
3	*
4	* Copyright (c) 2007,2008 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	return tv->tv_sec + tv->tv_usec * 1e-6;
78	else
79	return -1.;
80	}
81
82	#define EVENT_STRINGIFY(s) # s
83	#define EVENT_VERSION(a,b) EVENT_STRINGIFY (a) "." EVENT_STRINGIFY (b)
84
85	const char *event_get_version (void)
86	{
87	/* returns ABI, not API or library, version */
88	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
89	}
90
91	const char *event_get_method (void)
92	{
93	return "libev";
94	}
95
96	void *event_init (void)
97	{
98	#if EV_MULTIPLICITY
99	if (ev_x_cur)
100	ev_x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO);
101	else
102	ev_x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO);
103	#else
104	assert (("libev: multiple event bases not supported when not compiled with EV_MULTIPLICITY", !ev_x_cur));
105
106	ev_x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO);
107	#endif
108
109	return ev_x_cur;
110	}
111
112	void event_base_free (struct event_base *base)
113	{
114	dLOOPbase;
115
116	#if EV_MULTIPLICITY
117	if (ev_default_loop (EVFLAG_AUTO) != loop)
118	ev_loop_destroy (loop);
119	#endif
120	}
121
122	int event_dispatch (void)
123	{
124	return event_base_dispatch (ev_x_cur);
125	}
126
127	#ifdef EV_STANDALONE
128	void event_set_log_callback (event_log_cb cb)
129	{
130	/* nop */
131	}
132	#endif
133
134	int event_loop (int flags)
135	{
136	return event_base_loop (ev_x_cur, flags);
137	}
138
139	int event_loopexit (struct timeval *tv)
140	{
141	return event_base_loopexit (ev_x_cur, tv);
142	}
143
144	static void
145	ev_x_cb (struct event *ev, int revents)
146	{
147	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
148
149	ev->ev_res = revents;
150	ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg);
151	}
152
153	static void
154	ev_x_cb_sig (EV_P_ struct ev_signal *w, int revents)
155	{
156	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.sig));
157
158	if (revents & EV_ERROR)
159	event_del (ev);
160
161	ev_x_cb (ev, revents);
162	}
163
164	static void
165	ev_x_cb_io (EV_P_ struct ev_io *w, int revents)
166	{
167	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
168
169	if ((revents & EV_ERROR) \|\| !(ev->ev_events & EV_PERSIST))
170	event_del (ev);
171
172	ev_x_cb (ev, revents);
173	}
174
175	static void
176	ev_x_cb_to (EV_P_ struct ev_timer *w, int revents)
177	{
178	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
179
180	event_del (ev);
181
182	ev_x_cb (ev, revents);
183	}
184
185	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
186	{
187	if (events & EV_SIGNAL)
188	ev_init (&ev->iosig.sig, ev_x_cb_sig);
189	else
190	ev_init (&ev->iosig.io, ev_x_cb_io);
191
192	ev_init (&ev->to, ev_x_cb_to);
193
194	ev->ev_base = ev_x_cur; /* not threadsafe, but it's how libevent works */
195	ev->ev_fd = fd;
196	ev->ev_events = events;
197	ev->ev_pri = 0;
198	ev->ev_callback = cb;
199	ev->ev_arg = arg;
200	ev->ev_res = 0;
201	ev->ev_flags = EVLIST_INIT;
202	}
203
204	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
205	{
206	return event_base_once (ev_x_cur, fd, events, cb, arg, tv);
207	}
208
209	int event_add (struct event ev, struct timeval tv)
210	{
211	dLOOPev;
212
213	if (ev->ev_events & EV_SIGNAL)
214	{
215	if (!ev_is_active (&ev->iosig.sig))
216	{
217	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
218	ev_signal_start (EV_A_ &ev->iosig.sig);
219
220	ev->ev_flags \|= EVLIST_SIGNAL;
221	}
222	}
223	else if (ev->ev_events & (EV_READ \| EV_WRITE))
224	{
225	if (!ev_is_active (&ev->iosig.io))
226	{
227	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
228	ev_io_start (EV_A_ &ev->iosig.io);
229
230	ev->ev_flags \|= EVLIST_INSERTED;
231	}
232	}
233
234	if (tv)
235	{
236	ev->to.repeat = ev_tv_get (tv);
237	ev_timer_again (EV_A_ &ev->to);
238	ev->ev_flags \|= EVLIST_TIMEOUT;
239	}
240	else
241	{
242	ev_timer_stop (EV_A_ &ev->to);
243	ev->ev_flags &= ~EVLIST_TIMEOUT;
244	}
245
246	ev->ev_flags \|= EVLIST_ACTIVE;
247
248	return 0;
249	}
250
251	int event_del (struct event *ev)
252	{
253	dLOOPev;
254
255	if (ev->ev_events & EV_SIGNAL)
256	ev_signal_stop (EV_A_ &ev->iosig.sig);
257	else if (ev->ev_events & (EV_READ \| EV_WRITE))
258	ev_io_stop (EV_A_ &ev->iosig.io);
259
260	if (ev_is_active (&ev->to))
261	ev_timer_stop (EV_A_ &ev->to);
262
263	ev->ev_flags = EVLIST_INIT;
264
265	return 0;
266	}
267
268	void event_active (struct event *ev, int res, short ncalls)
269	{
270	dLOOPev;
271
272	if (res & EV_TIMEOUT)
273	ev_feed_event (EV_A_ &ev->to, res & EV_TIMEOUT);
274
275	if (res & EV_SIGNAL)
276	ev_feed_event (EV_A_ &ev->iosig.sig, res & EV_SIGNAL);
277
278	if (res & (EV_READ \| EV_WRITE))
279	ev_feed_event (EV_A_ &ev->iosig.io, res & (EV_READ \| EV_WRITE));
280	}
281
282	int event_pending (struct event ev, short events, struct timeval tv)
283	{
284	short revents = 0;
285	dLOOPev;
286
287	if (ev->ev_events & EV_SIGNAL)
288	{
289	/* sig */
290	if (ev_is_active (&ev->iosig.sig) \|\| ev_is_pending (&ev->iosig.sig))
291	revents \|= EV_SIGNAL;
292	}
293	else if (ev->ev_events & (EV_READ \| EV_WRITE))
294	{
295	/* io */
296	if (ev_is_active (&ev->iosig.io) \|\| ev_is_pending (&ev->iosig.io))
297	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
298	}
299
300	if (ev->ev_events & EV_TIMEOUT \|\| ev_is_active (&ev->to) \|\| ev_is_pending (&ev->to))
301	{
302	revents \|= EV_TIMEOUT;
303
304	if (tv)
305	ev_tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
306	}
307
308	return events & revents;
309	}
310
311	int event_priority_init (int npri)
312	{
313	return event_base_priority_init (ev_x_cur, npri);
314	}
315
316	int event_priority_set (struct event *ev, int pri)
317	{
318	ev->ev_pri = pri;
319
320	return 0;
321	}
322
323	int event_base_set (struct event_base base, struct event ev)
324	{
325	ev->ev_base = base;
326
327	return 0;
328	}
329
330	int event_base_loop (struct event_base *base, int flags)
331	{
332	dLOOPbase;
333
334	ev_loop (EV_A_ flags);
335
336	return 0;
337	}
338
339	int event_base_dispatch (struct event_base *base)
340	{
341	return event_base_loop (base, 0);
342	}
343
344	static void
345	ev_x_loopexit_cb (int revents, void *base)
346	{
347	dLOOPbase;
348
349	ev_unloop (EV_A_ EVUNLOOP_ONE);
350	}
351
352	int event_base_loopexit (struct event_base base, struct timeval tv)
353	{
354	ev_tstamp after = ev_tv_get (tv);
355	dLOOPbase;
356
357	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., ev_x_loopexit_cb, (void *)base);
358
359	return 0;
360	}
361
362	struct ev_x_once
363	{
364	int fd;
365	void (cb)(int, short, void );
366	void *arg;
367	};
368
369	static void
370	ev_x_once_cb (int revents, void *arg)
371	{
372	struct ev_x_once once = (struct ev_x_once )arg;
373
374	once->cb (once->fd, (short)revents, once->arg);
375	free (once);
376	}
377
378	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
379	{
380	struct ev_x_once once = (struct ev_x_once )malloc (sizeof (struct ev_x_once));
381	dLOOPbase;
382
383	if (!once)
384	return -1;
385
386	once->fd = fd;
387	once->cb = cb;
388	once->arg = arg;
389
390	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), ev_tv_get (tv), ev_x_once_cb, (void *)once);
391
392	return 0;
393	}
394
395	int event_base_priority_init (struct event_base *base, int npri)
396	{
397	/dLOOPbase;/
398
399	return 0;
400	}
401