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 (!x_cur && 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);
}

#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)
{
  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)
{
  return 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 = 0;

  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);

  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 = 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:	1.6
Committed:	Sat Nov 3 20:24:42 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+1 -1 lines
Log Message:	do not support multiple event bases. period.
#	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 (!x_cur && 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	#ifdef EV_STANDALONE
94	void event_set_log_callback (event_log_cb cb)
95	{
96	/* nop */
97	}
98	#endif
99
100	int event_loop (int flags)
101	{
102	return event_base_loop (x_cur, flags);
103	}
104
105	int event_loopexit (struct timeval *tv)
106	{
107	return event_base_loopexit (x_cur, tv);
108	}
109
110	static void
111	x_cb (struct event *ev, int revents)
112	{
113	if (ev->ev_events & EV_SIGNAL)
114	{
115	/* sig */
116	if (ev_is_active (&ev->iosig.sig))
117	{
118	ev_signal_stop (&ev->iosig.sig);
119	--x_actives;
120	}
121	}
122	else
123	{
124	/* io */
125	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->iosig.io))
126	{
127	ev_io_stop (&ev->iosig.io);
128	--x_actives;
129	}
130	}
131
132	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
133
134	if (revents & EV_TIMEOUT)
135	--x_actives;
136
137	ev->ev_res = revents;
138	ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
139	}
140
141	static void
142	x_cb_io (struct ev_io *w, int revents)
143	{
144	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.io)), revents);
145	}
146
147	static void
148	x_cb_to (struct ev_timer *w, int revents)
149	{
150	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
151	}
152
153	static void
154	x_cb_sig (struct ev_signal *w, int revents)
155	{
156	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
157	}
158
159	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
160	{
161	if (events & EV_SIGNAL)
162	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
163	else
164	ev_watcher_init (&ev->iosig.io, x_cb_io);
165
166	ev_watcher_init (&ev->to, x_cb_to);
167
168	ev->ev_base = x_cur;
169	ev->ev_fd = fd;
170	ev->ev_events = events;
171	ev->ev_pri = 0;
172	ev->ev_callback = cb;
173	ev->ev_arg = arg;
174	ev->ev_res = 0;
175	}
176
177	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
178	{
179	return event_base_once (x_cur, fd, events, cb, arg, tv);
180	}
181
182	int event_add (struct event ev, struct timeval tv)
183	{
184	/* disable all watchers */
185	event_del (ev);
186
187	if (ev->ev_events & EV_SIGNAL)
188	{
189	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
190	ev_signal_start (&ev->iosig.sig);
191	++x_actives;
192	}
193	else if (ev->ev_events & (EV_READ \| EV_WRITE))
194	{
195	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
196	ev_io_start (&ev->iosig.io);
197	++x_actives;
198	}
199
200	if (tv)
201	{
202	ev_timer_set (&ev->to, tv_get (tv), 0.);
203	ev_timer_start (&ev->to);
204	++x_actives;
205	}
206
207	return 0;
208	}
209
210	int event_del (struct event *ev)
211	{
212	if (ev->ev_events & EV_SIGNAL)
213	{
214	/* sig */
215	if (ev_is_active (&ev->iosig.sig))
216	{
217	ev_signal_stop (&ev->iosig.sig);
218	--x_actives;
219	}
220	}
221	else
222	{
223	/* io */
224	if (ev_is_active (&ev->iosig.io))
225	{
226	ev_io_stop (&ev->iosig.io);
227	--x_actives;
228	}
229	}
230
231	if (ev_is_active (&ev->to))
232	{
233	ev_timer_stop (&ev->to);
234	--x_actives;
235	}
236
237	return 0;
238	}
239
240	int event_pending (struct event ev, short events, struct timeval tv)
241	{
242	short revents = 0;
243
244	if (ev->ev_events & EV_SIGNAL)
245	{
246	/* sig */
247	if (ev->iosig.sig.pending)
248	revents \|= EV_SIGNAL;
249	}
250	else
251	{
252	/* io */
253	if (ev->iosig.io.pending)
254	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
255	}
256
257	if (ev->to.pending)
258	{
259	revents \|= EV_TIMEOUT;
260
261	if (tv)
262	tv_set (tv, ev_now); /* not sure if this is right :) */
263	}
264
265	return events & revents;
266	}
267
268	int event_priority_init (int npri)
269	{
270	return event_base_priority_init (x_cur, npri);
271	}
272
273	int event_priority_set (struct event *ev, int pri)
274	{
275	ev->ev_pri = pri;
276
277	return 0;
278	}
279
280	int event_base_set (struct event_base base, struct event ev)
281	{
282	ev->ev_base = base;
283
284	return 0;
285	}
286
287	int event_base_loop (struct event_base *base, int flags)
288	{
289	do
290	{
291	ev_loop (flags \| EVLOOP_ONESHOT);
292	}
293	while (!(flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done);
294
295	return 0;
296	}
297
298	int event_base_dispatch (struct event_base *base)
299	{
300	return event_base_loop (base, 0);
301	}
302
303	static void
304	x_loopexit_cb (int revents, void *arg)
305	{
306	ev_loop_done = 2;
307	}
308
309	int event_base_loopexit (struct event_base base, struct timeval tv)
310	{
311	ev_tstamp after = tv_get (tv);
312
313	ev_once (-1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
314
315	return -1;
316	}
317
318	struct x_once
319	{
320	int fd;
321	void (cb)(int, short, void );
322	void *arg;
323	};
324
325	static void
326	x_once_cb (int revents, void *arg)
327	{
328	struct x_once *once = arg;
329
330	once->cb (once->fd, revents, once->arg);
331	free (once);
332	}
333
334	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
335	{
336	struct x_once *once = malloc (sizeof (struct x_once));
337
338	if (!once)
339	return -1;
340
341	once->fd = fd;
342	once->cb = cb;
343	once->arg = arg;
344
345	ev_once (fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
346
347	return 0;
348	}
349
350	int event_base_priority_init (struct event_base *base, int npri)
351	{
352	return 0;
353	}
354