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

#include "ev.h"
#include "event.h"

#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 (EVMETHOD_AUTO);
  else
    x_cur = (struct event_base *)ev_default_loop (EVMETHOD_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 (EVMETHOD_AUTO);
#endif

  return x_cur;
}

void event_base_free (struct event_base *base)
{
  dLOOPbase;

#if EV_MULTIPLICITY
  if (ev_default_loop (EVMETHOD_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, 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)
    event_del (ev);
  else if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
    ev_io_stop (EV_A_ w);

  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_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; /* 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;
}

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;

  /* 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_A_ &ev->iosig.sig);
    }
  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_A_ &ev->iosig.io);
    }

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

  return 0;
}

int event_del (struct event *ev)
{
  dLOOPev;

  if (ev->ev_events & EV_SIGNAL)
    {
      /* sig */
      if (ev_is_active (&ev->iosig.sig))
        ev_signal_stop (EV_A_ &ev->iosig.sig);
    }
  else if (ev->ev_events & (EV_READ | EV_WRITE))
    {
      /* io */
      if (ev_is_active (&ev->iosig.io))
        ev_io_stop (EV_A_ &ev->iosig.io);
    }

  if (ev_is_active (&ev->to))
    ev_timer_stop (EV_A_ &ev->to);

  return 0;
}

void event_active (struct event *ev, int res, short ncalls)
{
  if (res & EV_TIMEOUT)
    ev_feed_event (&ev->to, res & EV_TIMEOUT);

  if (res & EV_SIGNAL)
    ev_feed_event (&ev->iosig.sig, res & EV_SIGNAL);

  if (res & (EV_READ | EV_WRITE))
    ev_feed_event (&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_ONCE);
}

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, 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:	1.22
Committed:	Thu Nov 8 21:20:51 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.21:	+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 <assert.h>
35
36	#ifndef WIN32
37	# include <sys/time.h>
38	#endif
39
40	#include "ev.h"
41	#include "event.h"
42
43	#if EV_MULTIPLICITY
44	# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
45	# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
46	#else
47	# define dLOOPev
48	# define dLOOPbase
49	#endif
50
51	/* never accessed, will always be cast from/to ev_loop */
52	struct event_base
53	{
54	int dummy;
55	};
56
57	static struct event_base *x_cur;
58
59	static void
60	tv_set (struct timeval *tv, ev_tstamp at)
61	{
62	tv->tv_sec = (long)at;
63	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
64	}
65
66	static ev_tstamp
67	tv_get (struct timeval *tv)
68	{
69	if (tv)
70	return tv->tv_sec + tv->tv_usec * 1e-6;
71	else
72	return -1.;
73	}
74
75	#define EVENT_VERSION(a,b) # a "." # b
76
77	const char *event_get_version (void)
78	{
79	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
80	}
81
82	const char *event_get_method (void)
83	{
84	return "libev";
85	}
86
87	void *event_init (void)
88	{
89	#if EV_MULTIPLICITY
90	if (x_cur)
91	x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
92	else
93	x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
94	#else
95	assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));
96
97	x_cur = (struct event_base *)(long)ev_default_loop (EVMETHOD_AUTO);
98	#endif
99
100	return x_cur;
101	}
102
103	void event_base_free (struct event_base *base)
104	{
105	dLOOPbase;
106
107	#if EV_MULTIPLICITY
108	if (ev_default_loop (EVMETHOD_AUTO) != loop)
109	ev_loop_destroy (loop);
110	#endif
111	}
112
113	int event_dispatch (void)
114	{
115	return event_base_dispatch (x_cur);
116	}
117
118	#ifdef EV_STANDALONE
119	void event_set_log_callback (event_log_cb cb)
120	{
121	/* nop */
122	}
123	#endif
124
125	int event_loop (int flags)
126	{
127	return event_base_loop (x_cur, flags);
128	}
129
130	int event_loopexit (struct timeval *tv)
131	{
132	return event_base_loopexit (x_cur, tv);
133	}
134
135	static void
136	x_cb (struct event *ev, int revents)
137	{
138	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
139
140	ev->ev_res = revents;
141	ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
142	}
143
144	static void
145	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
146	{
147	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.sig));
148
149	if (revents & EV_ERROR)
150	event_del (ev);
151
152	x_cb (ev, revents);
153	}
154
155	static void
156	x_cb_io (EV_P_ struct ev_io *w, int revents)
157	{
158	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
159
160	if (revents & EV_ERROR)
161	event_del (ev);
162	else if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
163	ev_io_stop (EV_A_ w);
164
165	x_cb (ev, revents);
166	}
167
168	static void
169	x_cb_to (EV_P_ struct ev_timer *w, int revents)
170	{
171	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
172
173	event_del (ev);
174
175	x_cb (ev, revents);
176	}
177
178	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
179	{
180	if (events & EV_SIGNAL)
181	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
182	else
183	ev_watcher_init (&ev->iosig.io, x_cb_io);
184
185	ev_watcher_init (&ev->to, x_cb_to);
186
187	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
188	ev->ev_fd = fd;
189	ev->ev_events = events;
190	ev->ev_pri = 0;
191	ev->ev_callback = cb;
192	ev->ev_arg = arg;
193	ev->ev_res = 0;
194	}
195
196	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
197	{
198	return event_base_once (x_cur, fd, events, cb, arg, tv);
199	}
200
201	int event_add (struct event ev, struct timeval tv)
202	{
203	dLOOPev;
204
205	/* disable all watchers */
206	event_del (ev);
207
208	if (ev->ev_events & EV_SIGNAL)
209	{
210	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
211	ev_signal_start (EV_A_ &ev->iosig.sig);
212	}
213	else if (ev->ev_events & (EV_READ \| EV_WRITE))
214	{
215	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
216	ev_io_start (EV_A_ &ev->iosig.io);
217	}
218
219	if (tv)
220	{
221	ev_timer_set (&ev->to, tv_get (tv), 0.);
222	ev_timer_start (EV_A_ &ev->to);
223	}
224
225	return 0;
226	}
227
228	int event_del (struct event *ev)
229	{
230	dLOOPev;
231
232	if (ev->ev_events & EV_SIGNAL)
233	{
234	/* sig */
235	if (ev_is_active (&ev->iosig.sig))
236	ev_signal_stop (EV_A_ &ev->iosig.sig);
237	}
238	else if (ev->ev_events & (EV_READ \| EV_WRITE))
239	{
240	/* io */
241	if (ev_is_active (&ev->iosig.io))
242	ev_io_stop (EV_A_ &ev->iosig.io);
243	}
244
245	if (ev_is_active (&ev->to))
246	ev_timer_stop (EV_A_ &ev->to);
247
248	return 0;
249	}
250
251	void event_active (struct event *ev, int res, short ncalls)
252	{
253	if (res & EV_TIMEOUT)
254	ev_feed_event (&ev->to, res & EV_TIMEOUT);
255
256	if (res & EV_SIGNAL)
257	ev_feed_event (&ev->iosig.sig, res & EV_SIGNAL);
258
259	if (res & (EV_READ \| EV_WRITE))
260	ev_feed_event (&ev->iosig.io, res & (EV_READ \| EV_WRITE));
261	}
262
263	int event_pending (struct event ev, short events, struct timeval tv)
264	{
265	short revents = 0;
266	dLOOPev;
267
268
269	if (ev->ev_events & EV_SIGNAL)
270	{
271	/* sig */
272	if (ev_is_active (&ev->iosig.sig) \|\| ev_is_pending (&ev->iosig.sig))
273	revents \|= EV_SIGNAL;
274	}
275	else if (ev->ev_events & (EV_READ \| EV_WRITE))
276	{
277	/* io */
278	if (ev_is_active (&ev->iosig.io) \|\| ev_is_pending (&ev->iosig.io))
279	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
280	}
281
282	if (ev->ev_events & EV_TIMEOUT \|\| ev_is_active (&ev->to) \|\| ev_is_pending (&ev->to))
283	{
284	revents \|= EV_TIMEOUT;
285
286	if (tv)
287	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
288	}
289
290	return events & revents;
291	}
292
293	int event_priority_init (int npri)
294	{
295	return event_base_priority_init (x_cur, npri);
296	}
297
298	int event_priority_set (struct event *ev, int pri)
299	{
300	ev->ev_pri = pri;
301
302	return 0;
303	}
304
305	int event_base_set (struct event_base base, struct event ev)
306	{
307	ev->ev_base = base;
308
309	return 0;
310	}
311
312	int event_base_loop (struct event_base *base, int flags)
313	{
314	dLOOPbase;
315
316	ev_loop (EV_A_ flags);
317
318	return 0;
319	}
320
321	int event_base_dispatch (struct event_base *base)
322	{
323	return event_base_loop (base, 0);
324	}
325
326	static void
327	x_loopexit_cb (int revents, void *base)
328	{
329	dLOOPbase;
330
331	ev_unloop (EV_A_ EVUNLOOP_ONCE);
332	}
333
334	int event_base_loopexit (struct event_base base, struct timeval tv)
335	{
336	ev_tstamp after = tv_get (tv);
337	dLOOPbase;
338
339	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
340
341	return -1;
342	}
343
344	struct x_once
345	{
346	int fd;
347	void (cb)(int, short, void );
348	void *arg;
349	};
350
351	static void
352	x_once_cb (int revents, void *arg)
353	{
354	struct x_once once = (struct x_once )arg;
355
356	once->cb (once->fd, revents, once->arg);
357	free (once);
358	}
359
360	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
361	{
362	struct x_once once = (struct x_once )malloc (sizeof (struct x_once));
363	dLOOPbase;
364
365	if (!once)
366	return -1;
367
368	once->fd = fd;
369	once->cb = cb;
370	once->arg = arg;
371
372	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
373
374	return 0;
375	}
376
377	int event_base_priority_init (struct event_base *base, int npri)
378	{
379	/dLOOPbase;/
380
381	return 0;
382	}
383