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_is_active (&ev->sig))
    {
      ev_signal_stop (&ev->sig);
      --x_actives;
    }

  if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->io))
    {
      ev_io_stop (&ev->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, 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, sig)), revents);
}

void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg)
{
  ev_watcher_init (&ev->io, x_cb_io);
  ev_watcher_init (&ev->to, x_cb_to);
  ev_watcher_init (&ev->sig, x_cb_sig);

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

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

  if (ev->ev_events & (EV_READ | EV_WRITE))
    {
      if (ev_is_active (&ev->io))
        {
          ev_io_stop (&ev->io);
          --x_actives;
        }

      ev_io_set (&ev->io, ev->ev_fd, ev->ev_events & (EV_READ | EV_WRITE));
      ev_io_start (&ev->io);
      ++x_actives;
    }

  if (ev->ev_events & EV_SIGNAL)
    {
      if (ev_is_active (&ev->sig))
        {
          ev_signal_stop (&ev->sig);
          --x_actives;
        }

      ev_signal_set (&ev->sig, ev->ev_fd);
      ev_signal_start (&ev->sig);
      ++x_actives;
    }

  return 0;
}

int event_del (struct event *ev)
{
  if (ev_is_active (&ev->io))
    {
      ev_io_stop (&ev->io);
      --x_actives;
    }

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

  if (ev_is_active (&ev->sig))
    {
      ev_signal_stop (&ev->sig);
      --x_actives;
    }

  return 0;
}

void event_active (struct event *ev, int fd, short events)
{
  /* unclear what this does, likely internal-use */
}

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

  if (ev->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 :) */
    }

  if (ev->sig.pending)
    revents |= EV_SIGNAL;

  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:	1.2
Committed:	Thu Nov 1 18:13:44 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+3 -3 lines
Log Message:	* empty log message *
#	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_is_active (&ev->sig))
112	{
113	ev_signal_stop (&ev->sig);
114	--x_actives;
115	}
116
117	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->io))
118	{
119	ev_io_stop (&ev->io);
120	--x_actives;
121	}
122
123	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
124
125	if (revents & EV_TIMEOUT)
126	--x_actives;
127
128	ev->ev_res = revents;
129	ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
130	}
131
132	static void
133	x_cb_io (struct ev_io *w, int revents)
134	{
135	x_cb ((struct event )(((char )w) - offsetof (struct event, io)), revents);
136	}
137
138	static void
139	x_cb_to (struct ev_timer *w, int revents)
140	{
141	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
142	}
143
144	static void
145	x_cb_sig (struct ev_signal *w, int revents)
146	{
147	x_cb ((struct event )(((char )w) - offsetof (struct event, sig)), revents);
148	}
149
150	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
151	{
152	ev_watcher_init (&ev->io, x_cb_io);
153	ev_watcher_init (&ev->to, x_cb_to);
154	ev_watcher_init (&ev->sig, x_cb_sig);
155
156	ev->ev_base = x_cur;
157	ev->ev_fd = fd;
158	ev->ev_events = events;
159	ev->ev_pri = 0;
160	ev->ev_callback = cb;
161	ev->ev_arg = arg;
162	ev->ev_res = 0;
163	}
164
165	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
166	{
167	event_base_once (x_cur, fd, events, cb, arg, tv);
168	}
169
170	int event_add (struct event ev, struct timeval tv)
171	{
172	if (tv)
173	{
174	if (ev_is_active (&ev->to))
175	{
176	ev_timer_stop (&ev->to);
177	--x_actives;
178	}
179
180	ev_timer_set (&ev->to, tv_get (tv), 0.);
181	ev_timer_start (&ev->to);
182	++x_actives;
183	}
184
185	if (ev->ev_events & (EV_READ \| EV_WRITE))
186	{
187	if (ev_is_active (&ev->io))
188	{
189	ev_io_stop (&ev->io);
190	--x_actives;
191	}
192
193	ev_io_set (&ev->io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
194	ev_io_start (&ev->io);
195	++x_actives;
196	}
197
198	if (ev->ev_events & EV_SIGNAL)
199	{
200	if (ev_is_active (&ev->sig))
201	{
202	ev_signal_stop (&ev->sig);
203	--x_actives;
204	}
205
206	ev_signal_set (&ev->sig, ev->ev_fd);
207	ev_signal_start (&ev->sig);
208	++x_actives;
209	}
210
211	return 0;
212	}
213
214	int event_del (struct event *ev)
215	{
216	if (ev_is_active (&ev->io))
217	{
218	ev_io_stop (&ev->io);
219	--x_actives;
220	}
221
222	if (ev_is_active (&ev->to))
223	{
224	ev_timer_stop (&ev->to);
225	--x_actives;
226	}
227
228	if (ev_is_active (&ev->sig))
229	{
230	ev_signal_stop (&ev->sig);
231	--x_actives;
232	}
233
234	return 0;
235	}
236
237	void event_active (struct event *ev, int fd, short events)
238	{
239	/* unclear what this does, likely internal-use */
240	}
241
242	int event_pending (struct event ev, short events, struct timeval tv)
243	{
244	short revents;
245
246	if (ev->io.pending)
247	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
248
249	if (ev->to.pending)
250	{
251	revents \|= EV_TIMEOUT;
252
253	if (tv)
254	tv_set (tv, ev_now); /* not sure if this is right :) */
255	}
256
257	if (ev->sig.pending)
258	revents \|= EV_SIGNAL;
259
260	return events & revents;
261	}
262
263	int event_priority_init (int npri)
264	{
265	return event_base_priority_init (x_cur, npri);
266	}
267
268	int event_priority_set (struct event *ev, int pri)
269	{
270	ev->ev_pri = pri;
271
272	return 0;
273	}
274
275	int event_base_set (struct event_base base, struct event ev)
276	{
277	ev->ev_base = base;
278
279	return 0;
280	}
281
282	int event_base_loop (struct event_base *base, int flags)
283	{
284	do
285	{
286	ev_loop (flags \| EVLOOP_ONESHOT);
287	}
288	while (!(flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done);
289
290	return 0;
291	}
292
293	int event_base_dispatch (struct event_base *base)
294	{
295	return event_base_loop (base, 0);
296	}
297
298	static void
299	x_loopexit_cb (int revents, void *arg)
300	{
301	ev_loop_done = 2;
302	}
303
304	int event_base_loopexit (struct event_base base, struct timeval tv)
305	{
306	ev_tstamp after = tv_get (tv);
307
308	ev_once (-1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
309	}
310
311	struct x_once
312	{
313	int fd;
314	void (cb)(int, short, void );
315	void *arg;
316	};
317
318	static void
319	x_once_cb (int revents, void *arg)
320	{
321	struct x_once *once = arg;
322
323	once->cb (once->fd, revents, once->arg);
324	free (once);
325	}
326
327	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
328	{
329	struct x_once *once = malloc (sizeof (struct x_once));
330
331	if (!once)
332	return -1;
333
334	once->fd = fd;
335	once->cb = cb;
336	once->arg = arg;
337
338	ev_once (fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
339
340	return 0;
341	}
342
343	int event_base_priority_init (struct event_base *base, int npri)
344	{
345	return 0;
346	}
347