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 <sys/time.h>

#include "event.h"

struct event_base
{
  int dummy;
};

static int x_actives;

static struct event_base x_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_init (0))
    return x_cur = &x_base;

  return 0;
}

void event_base_free (struct event_base *base)
{
  /* nop */
}

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

void event_set_log_callback (event_log_cb cb)
{
  /* nop */
}

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

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

static void
x_cb (struct event *ev, int revents)
{
  if (ev->ev_events & EV_SIGNAL)
    {
      /* sig */
      if (ev_is_active (&ev->iosig.sig))
        {
          ev_signal_stop (&ev->iosig.sig);
          --x_actives;
        }
    }
  else
    {
       /* io */
      if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->iosig.io))
        {
          ev_io_stop (&ev->iosig.io);
          --x_actives;
        }
    }

  revents &= EV_READ | EV_WRITE | EV_TIMEOUT | EV_SIGNAL;

  if (revents & EV_TIMEOUT)
    --x_actives;

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

static void
x_cb_io (struct ev_io *w, int revents)
{
  x_cb ((struct event *)(((char *)w) - offsetof (struct event, iosig.io)), revents);
}

static void
x_cb_to (struct ev_timer *w, int revents)
{
  x_cb ((struct event *)(((char *)w) - offsetof (struct event, to)), revents);
}

static void
x_cb_sig (struct ev_signal *w, int revents)
{
  x_cb ((struct event *)(((char *)w) - offsetof (struct event, iosig.sig)), revents);
}

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

  ev_watcher_init (&ev->to, x_cb_to);

  ev->ev_base     = x_cur;
  ev->ev_fd       = fd;
  ev->ev_events   = events;
  ev->ev_pri      = 0;
  ev->ev_callback = cb;
  ev->ev_arg      = arg;
  ev->ev_res      = 0;
}

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

int event_add (struct event *ev, struct timeval *tv)
{
  /* disable all watchers */
  event_del (ev);

  if (ev->ev_events & EV_SIGNAL)
    {
      ev_signal_set (&ev->iosig.sig, ev->ev_fd);
      ev_signal_start (&ev->iosig.sig);
      ++x_actives;
    }
  else if (ev->ev_events & (EV_READ | EV_WRITE))
    {
      ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ | EV_WRITE));
      ev_io_start (&ev->iosig.io);
      ++x_actives;
    }

  if (tv)
    {
      ev_timer_set (&ev->to, tv_get (tv), 0.);
      ev_timer_start (&ev->to);
      ++x_actives;
    }

  return 0;
}

int event_del (struct event *ev)
{
  if (ev->ev_events & EV_SIGNAL)
    {
      /* sig */
      if (ev_is_active (&ev->iosig.sig))
        {
          ev_signal_stop (&ev->iosig.sig);
          --x_actives;
        }
    }
  else
    {
      /* io */
      if (ev_is_active (&ev->iosig.io))
        {
          ev_io_stop (&ev->iosig.io);
          --x_actives;
        }
    }

  if (ev_is_active (&ev->to))
    {
      ev_timer_stop (&ev->to);
      --x_actives;
    }

  return 0;
}

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

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

  if (ev->to.pending)
    {
      revents |= EV_TIMEOUT;

      if (tv)
        tv_set (tv, ev_now); /* 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)
{
  do
    {
      ev_loop (flags | EVLOOP_ONESHOT);
    }
  while (!(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done);

  return 0;
}

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

static void
x_loopexit_cb (int revents, void *arg)
{
  ev_loop_done = 2;
}

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

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

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 = arg;

  once->cb (once->fd, 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 = malloc (sizeof (struct x_once));

  if (!once)
    return -1;

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

  ev_once (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)
{
  return 0;
}

Revision:	1.4
Committed:	Fri Nov 2 13:08:51 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+61 -53 lines
Log Message:	improve event compatibility, make watchers much smaller by union'ising io and sig watchers
#	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 <sys/time.h>
35
36	#include "event.h"
37
38	struct event_base
39	{
40	int dummy;
41	};
42
43	static int x_actives;
44
45	static struct event_base x_base, *x_cur;
46
47	static void
48	tv_set (struct timeval *tv, ev_tstamp at)
49	{
50	tv->tv_sec = (long)at;
51	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
52	}
53
54	static ev_tstamp
55	tv_get (struct timeval *tv)
56	{
57	if (tv)
58	return tv->tv_sec + tv->tv_usec * 1e-6;
59	else
60	return -1.;
61	}
62
63	#define EVENT_VERSION(a,b) # a "." # b
64
65	const char *event_get_version (void)
66	{
67	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
68	}
69
70	const char *event_get_method (void)
71	{
72	return "libev";
73	}
74
75	void *event_init (void)
76	{
77	if (ev_init (0))
78	return x_cur = &x_base;
79
80	return 0;
81	}
82
83	void event_base_free (struct event_base *base)
84	{
85	/* nop */
86	}
87
88	int event_dispatch (void)
89	{
90	return event_base_dispatch (x_cur);
91	}
92
93	void event_set_log_callback (event_log_cb cb)
94	{
95	/* nop */
96	}
97
98	int event_loop (int flags)
99	{
100	return event_base_loop (x_cur, flags);
101	}
102
103	int event_loopexit (struct timeval *tv)
104	{
105	event_base_loopexit (x_cur, tv);
106	}
107
108	static void
109	x_cb (struct event *ev, int revents)
110	{
111	if (ev->ev_events & EV_SIGNAL)
112	{
113	/* sig */
114	if (ev_is_active (&ev->iosig.sig))
115	{
116	ev_signal_stop (&ev->iosig.sig);
117	--x_actives;
118	}
119	}
120	else
121	{
122	/* io */
123	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->iosig.io))
124	{
125	ev_io_stop (&ev->iosig.io);
126	--x_actives;
127	}
128	}
129
130	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
131
132	if (revents & EV_TIMEOUT)
133	--x_actives;
134
135	ev->ev_res = revents;
136	ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
137	}
138
139	static void
140	x_cb_io (struct ev_io *w, int revents)
141	{
142	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.io)), revents);
143	}
144
145	static void
146	x_cb_to (struct ev_timer *w, int revents)
147	{
148	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
149	}
150
151	static void
152	x_cb_sig (struct ev_signal *w, int revents)
153	{
154	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
155	}
156
157	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
158	{
159	if (events & EV_SIGNAL)
160	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
161	else
162	ev_watcher_init (&ev->iosig.io, x_cb_io);
163
164	ev_watcher_init (&ev->to, x_cb_to);
165
166	ev->ev_base = x_cur;
167	ev->ev_fd = fd;
168	ev->ev_events = events;
169	ev->ev_pri = 0;
170	ev->ev_callback = cb;
171	ev->ev_arg = arg;
172	ev->ev_res = 0;
173	}
174
175	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
176	{
177	event_base_once (x_cur, fd, events, cb, arg, tv);
178	}
179
180	int event_add (struct event ev, struct timeval tv)
181	{
182	/* disable all watchers */
183	event_del (ev);
184
185	if (ev->ev_events & EV_SIGNAL)
186	{
187	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
188	ev_signal_start (&ev->iosig.sig);
189	++x_actives;
190	}
191	else if (ev->ev_events & (EV_READ \| EV_WRITE))
192	{
193	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
194	ev_io_start (&ev->iosig.io);
195	++x_actives;
196	}
197
198	if (tv)
199	{
200	ev_timer_set (&ev->to, tv_get (tv), 0.);
201	ev_timer_start (&ev->to);
202	++x_actives;
203	}
204
205	return 0;
206	}
207
208	int event_del (struct event *ev)
209	{
210	if (ev->ev_events & EV_SIGNAL)
211	{
212	/* sig */
213	if (ev_is_active (&ev->iosig.sig))
214	{
215	ev_signal_stop (&ev->iosig.sig);
216	--x_actives;
217	}
218	}
219	else
220	{
221	/* io */
222	if (ev_is_active (&ev->iosig.io))
223	{
224	ev_io_stop (&ev->iosig.io);
225	--x_actives;
226	}
227	}
228
229	if (ev_is_active (&ev->to))
230	{
231	ev_timer_stop (&ev->to);
232	--x_actives;
233	}
234
235	return 0;
236	}
237
238	int event_pending (struct event ev, short events, struct timeval tv)
239	{
240	short revents;
241
242	if (ev->ev_events & EV_SIGNAL)
243	{
244	/* sig */
245	if (ev->iosig.sig.pending)
246	revents \|= EV_SIGNAL;
247	}
248	else
249	{
250	/* io */
251	if (ev->iosig.io.pending)
252	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
253	}
254
255	if (ev->to.pending)
256	{
257	revents \|= EV_TIMEOUT;
258
259	if (tv)
260	tv_set (tv, ev_now); /* not sure if this is right :) */
261	}
262
263	return events & revents;
264	}
265
266	int event_priority_init (int npri)
267	{
268	return event_base_priority_init (x_cur, npri);
269	}
270
271	int event_priority_set (struct event *ev, int pri)
272	{
273	ev->ev_pri = pri;
274
275	return 0;
276	}
277
278	int event_base_set (struct event_base base, struct event ev)
279	{
280	ev->ev_base = base;
281
282	return 0;
283	}
284
285	int event_base_loop (struct event_base *base, int flags)
286	{
287	do
288	{
289	ev_loop (flags \| EVLOOP_ONESHOT);
290	}
291	while (!(flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done);
292
293	return 0;
294	}
295
296	int event_base_dispatch (struct event_base *base)
297	{
298	return event_base_loop (base, 0);
299	}
300
301	static void
302	x_loopexit_cb (int revents, void *arg)
303	{
304	ev_loop_done = 2;
305	}
306
307	int event_base_loopexit (struct event_base base, struct timeval tv)
308	{
309	ev_tstamp after = tv_get (tv);
310
311	ev_once (-1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
312	}
313
314	struct x_once
315	{
316	int fd;
317	void (cb)(int, short, void );
318	void *arg;
319	};
320
321	static void
322	x_once_cb (int revents, void *arg)
323	{
324	struct x_once *once = arg;
325
326	once->cb (once->fd, revents, once->arg);
327	free (once);
328	}
329
330	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
331	{
332	struct x_once *once = malloc (sizeof (struct x_once));
333
334	if (!once)
335	return -1;
336
337	once->fd = fd;
338	once->cb = cb;
339	once->arg = arg;
340
341	ev_once (fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
342
343	return 0;
344	}
345
346	int event_base_priority_init (struct event_base *base, int npri)
347	{
348	return 0;
349	}
350