libev/event.c

/*
 * libevent compatibility layer
 *
 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, 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 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

#ifndef WIN32
# include <sys/time.h>
#endif

#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 *x_cur;

static void
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
tv_get (struct timeval *tv)
{
  if (tv)
    return tv->tv_sec + tv->tv_usec * 1e-6;
  else
    return -1.;
}

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

const char *event_get_version (void)
{
  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 (x_cur)
    x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO);
  else
    x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO);
#else
  assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));

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

  return 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 (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 (x_cur, flags);
}

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

static void
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
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);

  x_cb (ev, revents);
}

static void
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);

  x_cb (ev, revents);
}

static void
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);

  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, x_cb_sig);
  else
    ev_init (&ev->iosig.io, x_cb_io);

  ev_init (&ev->to, x_cb_to);

  ev->ev_base     = x_cur; /* not threadsafe, but its like 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 (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 = 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)
        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 (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
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 = tv_get (tv);
  dLOOPbase;

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

  return -1;
}

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

static void
x_once_cb (int revents, void *arg)
{
  struct x_once *once = (struct 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 x_once *once = (struct x_once *)malloc (sizeof (struct 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), tv_get (tv), x_once_cb, (void *)once);

  return 0;
}

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

  return 0;
}

Revision:	1.32
Committed:	Thu Nov 29 12:21:06 2007 UTC (16 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_0, rel-1_71, rel-1_8, rel-1_72, rel-1_6, rel-1_81, rel-1_86, rel-1_85
Changes since 1.31:	+6 -17 lines
Log Message:	many fixes to event emulation
#	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
8	* modification, are permitted provided that the following conditions are
9	* met:
10	*
11	* * Redistributions of source code must retain the above copyright
12	* notice, this list of conditions and the following disclaimer.
13	*
14	* * Redistributions in binary form must reproduce the above
15	* copyright notice, this list of conditions and the following
16	* disclaimer in the documentation and/or other materials provided
17	* with the distribution.
18	*
19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30	*/
31
32	#include <stddef.h>
33	#include <stdlib.h>
34	#include <assert.h>
35
36	#ifndef WIN32
37	# include <sys/time.h>
38	#endif
39
40	#ifdef EV_EVENT_H
41	# include EV_EVENT_H
42	#else
43	# include "event.h"
44	#endif
45
46	#if EV_MULTIPLICITY
47	# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
48	# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
49	#else
50	# define dLOOPev
51	# define dLOOPbase
52	#endif
53
54	/* never accessed, will always be cast from/to ev_loop */
55	struct event_base
56	{
57	int dummy;
58	};
59
60	static struct event_base *x_cur;
61
62	static void
63	tv_set (struct timeval *tv, ev_tstamp at)
64	{
65	tv->tv_sec = (long)at;
66	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
67	}
68
69	static ev_tstamp
70	tv_get (struct timeval *tv)
71	{
72	if (tv)
73	return tv->tv_sec + tv->tv_usec * 1e-6;
74	else
75	return -1.;
76	}
77
78	#define EVENT_VERSION(a,b) # a "." # b
79
80	const char *event_get_version (void)
81	{
82	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
83	}
84
85	const char *event_get_method (void)
86	{
87	return "libev";
88	}
89
90	void *event_init (void)
91	{
92	#if EV_MULTIPLICITY
93	if (x_cur)
94	x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO);
95	else
96	x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO);
97	#else
98	assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));
99
100	x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO);
101	#endif
102
103	return x_cur;
104	}
105
106	void event_base_free (struct event_base *base)
107	{
108	dLOOPbase;
109
110	#if EV_MULTIPLICITY
111	if (ev_default_loop (EVFLAG_AUTO) != loop)
112	ev_loop_destroy (loop);
113	#endif
114	}
115
116	int event_dispatch (void)
117	{
118	return event_base_dispatch (x_cur);
119	}
120
121	#ifdef EV_STANDALONE
122	void event_set_log_callback (event_log_cb cb)
123	{
124	/* nop */
125	}
126	#endif
127
128	int event_loop (int flags)
129	{
130	return event_base_loop (x_cur, flags);
131	}
132
133	int event_loopexit (struct timeval *tv)
134	{
135	return event_base_loopexit (x_cur, tv);
136	}
137
138	static void
139	x_cb (struct event *ev, int revents)
140	{
141	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
142
143	ev->ev_res = revents;
144	ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg);
145	}
146
147	static void
148	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
149	{
150	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.sig));
151
152	if (revents & EV_ERROR)
153	event_del (ev);
154
155	x_cb (ev, revents);
156	}
157
158	static void
159	x_cb_io (EV_P_ struct ev_io *w, int revents)
160	{
161	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
162
163	if ((revents & EV_ERROR) \|\| !(ev->ev_events & EV_PERSIST))
164	event_del (ev);
165
166	x_cb (ev, revents);
167	}
168
169	static void
170	x_cb_to (EV_P_ struct ev_timer *w, int revents)
171	{
172	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
173
174	event_del (ev);
175
176	x_cb (ev, revents);
177	}
178
179	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
180	{
181	if (events & EV_SIGNAL)
182	ev_init (&ev->iosig.sig, x_cb_sig);
183	else
184	ev_init (&ev->iosig.io, x_cb_io);
185
186	ev_init (&ev->to, x_cb_to);
187
188	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
189	ev->ev_fd = fd;
190	ev->ev_events = events;
191	ev->ev_pri = 0;
192	ev->ev_callback = cb;
193	ev->ev_arg = arg;
194	ev->ev_res = 0;
195	ev->ev_flags = EVLIST_INIT;
196	}
197
198	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
199	{
200	return event_base_once (x_cur, fd, events, cb, arg, tv);
201	}
202
203	int event_add (struct event ev, struct timeval tv)
204	{
205	dLOOPev;
206
207	if (ev->ev_events & EV_SIGNAL)
208	{
209	if (!ev_is_active (&ev->iosig.sig))
210	{
211	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
212	ev_signal_start (EV_A_ &ev->iosig.sig);
213
214	ev->ev_flags \|= EVLIST_SIGNAL;
215	}
216	}
217	else if (ev->ev_events & (EV_READ \| EV_WRITE))
218	{
219	if (!ev_is_active (&ev->iosig.io))
220	{
221	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
222	ev_io_start (EV_A_ &ev->iosig.io);
223
224	ev->ev_flags \|= EVLIST_INSERTED;
225	}
226	}
227
228	if (tv)
229	{
230	ev->to.repeat = tv_get (tv);
231	ev_timer_again (EV_A_ &ev->to);
232	ev->ev_flags \|= EVLIST_TIMEOUT;
233	}
234	else
235	{
236	ev_timer_stop (EV_A_ &ev->to);
237	ev->ev_flags &= ~EVLIST_TIMEOUT;
238	}
239
240	ev->ev_flags \|= EVLIST_ACTIVE;
241
242	return 0;
243	}
244
245	int event_del (struct event *ev)
246	{
247	dLOOPev;
248
249	if (ev->ev_events & EV_SIGNAL)
250	ev_signal_stop (EV_A_ &ev->iosig.sig);
251	else if (ev->ev_events & (EV_READ \| EV_WRITE))
252	ev_io_stop (EV_A_ &ev->iosig.io);
253
254	if (ev_is_active (&ev->to))
255	ev_timer_stop (EV_A_ &ev->to);
256
257	ev->ev_flags = EVLIST_INIT;
258
259	return 0;
260	}
261
262	void event_active (struct event *ev, int res, short ncalls)
263	{
264	dLOOPev;
265
266	if (res & EV_TIMEOUT)
267	ev_feed_event (EV_A_ &ev->to, res & EV_TIMEOUT);
268
269	if (res & EV_SIGNAL)
270	ev_feed_event (EV_A_ &ev->iosig.sig, res & EV_SIGNAL);
271
272	if (res & (EV_READ \| EV_WRITE))
273	ev_feed_event (EV_A_ &ev->iosig.io, res & (EV_READ \| EV_WRITE));
274	}
275
276	int event_pending (struct event ev, short events, struct timeval tv)
277	{
278	short revents = 0;
279	dLOOPev;
280
281
282	if (ev->ev_events & EV_SIGNAL)
283	{
284	/* sig */
285	if (ev_is_active (&ev->iosig.sig) \|\| ev_is_pending (&ev->iosig.sig))
286	revents \|= EV_SIGNAL;
287	}
288	else if (ev->ev_events & (EV_READ \| EV_WRITE))
289	{
290	/* io */
291	if (ev_is_active (&ev->iosig.io) \|\| ev_is_pending (&ev->iosig.io))
292	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
293	}
294
295	if (ev->ev_events & EV_TIMEOUT \|\| ev_is_active (&ev->to) \|\| ev_is_pending (&ev->to))
296	{
297	revents \|= EV_TIMEOUT;
298
299	if (tv)
300	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
301	}
302
303	return events & revents;
304	}
305
306	int event_priority_init (int npri)
307	{
308	return event_base_priority_init (x_cur, npri);
309	}
310
311	int event_priority_set (struct event *ev, int pri)
312	{
313	ev->ev_pri = pri;
314
315	return 0;
316	}
317
318	int event_base_set (struct event_base base, struct event ev)
319	{
320	ev->ev_base = base;
321
322	return 0;
323	}
324
325	int event_base_loop (struct event_base *base, int flags)
326	{
327	dLOOPbase;
328
329	ev_loop (EV_A_ flags);
330
331	return 0;
332	}
333
334	int event_base_dispatch (struct event_base *base)
335	{
336	return event_base_loop (base, 0);
337	}
338
339	static void
340	x_loopexit_cb (int revents, void *base)
341	{
342	dLOOPbase;
343
344	ev_unloop (EV_A_ EVUNLOOP_ONE);
345	}
346
347	int event_base_loopexit (struct event_base base, struct timeval tv)
348	{
349	ev_tstamp after = tv_get (tv);
350	dLOOPbase;
351
352	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
353
354	return -1;
355	}
356
357	struct x_once
358	{
359	int fd;
360	void (cb)(int, short, void );
361	void *arg;
362	};
363
364	static void
365	x_once_cb (int revents, void *arg)
366	{
367	struct x_once once = (struct x_once )arg;
368
369	once->cb (once->fd, (short)revents, once->arg);
370	free (once);
371	}
372
373	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
374	{
375	struct x_once once = (struct x_once )malloc (sizeof (struct x_once));
376	dLOOPbase;
377
378	if (!once)
379	return -1;
380
381	once->fd = fd;
382	once->cb = cb;
383	once->arg = arg;
384
385	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
386
387	return 0;
388	}
389
390	int event_base_priority_init (struct event_base *base, int npri)
391	{
392	/dLOOPbase;/
393
394	return 0;
395	}
396