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 <assert.h>

#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 *)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)
{
  x_cb ((struct event *)(((char *)w) - offsetof (struct event, iosig.sig)), 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 (!(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)
{
  printf ("event set %p\n", ev);//D
  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)
{
  printf ("event add %p %p\n", ev, &ev->to);//D
  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)
{
  printf ("event del %p\n", ev);//D
  dLOOPev;

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

  printf ("to %p %d\n", &ev->to, ev->to.active);//D
  if (ev_is_active (&ev->to))
    ev_timer_stop (EV_A_ &ev->to);

  return 0;
}

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

  short revents = 0;

  if (ev->ev_events & EV_SIGNAL)
    {
      /* sig */
      if (ev_is_active (&ev->iosig.sig) || ev_is_pending (&ev->iosig.sig))
        revents |= EV_SIGNAL;
    }
  else
    {
      /* 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)
{
  dLOOPbase;
  ev_tstamp after = tv_get (tv);

  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 = 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)
{
  dLOOPbase;
  struct x_once *once = malloc (sizeof (struct x_once));

  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:	1.15
Committed:	Sun Nov 4 20:38:07 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.14:	+4 -0 lines
Log Message:	need to rethinkg design, maybe use 'proper' struct subclassing due to aliasing restrictions in C
#	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	#include <assert.h>
36
37	#include "ev.h"
38	#include "event.h"
39
40	#if EV_MULTIPLICITY
41	# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
42	# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
43	#else
44	# define dLOOPev
45	# define dLOOPbase
46	#endif
47
48	/* never accessed, will always be cast from/to ev_loop */
49	struct event_base
50	{
51	int dummy;
52	};
53
54	static struct event_base *x_cur;
55
56	static void
57	tv_set (struct timeval *tv, ev_tstamp at)
58	{
59	tv->tv_sec = (long)at;
60	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
61	}
62
63	static ev_tstamp
64	tv_get (struct timeval *tv)
65	{
66	if (tv)
67	return tv->tv_sec + tv->tv_usec * 1e-6;
68	else
69	return -1.;
70	}
71
72	#define EVENT_VERSION(a,b) # a "." # b
73
74	const char *event_get_version (void)
75	{
76	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
77	}
78
79	const char *event_get_method (void)
80	{
81	return "libev";
82	}
83
84	void *event_init (void)
85	{
86	#if EV_MULTIPLICITY
87	if (x_cur)
88	x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
89	else
90	x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
91	#else
92	assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));
93
94	x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
95	#endif
96
97	return x_cur;
98	}
99
100	void event_base_free (struct event_base *base)
101	{
102	dLOOPbase;
103
104	#if EV_MULTIPLICITY
105	if (ev_default_loop (EVMETHOD_AUTO) != loop)
106	ev_loop_destroy (loop);
107	#endif
108	}
109
110	int event_dispatch (void)
111	{
112	return event_base_dispatch (x_cur);
113	}
114
115	#ifdef EV_STANDALONE
116	void event_set_log_callback (event_log_cb cb)
117	{
118	/* nop */
119	}
120	#endif
121
122	int event_loop (int flags)
123	{
124	return event_base_loop (x_cur, flags);
125	}
126
127	int event_loopexit (struct timeval *tv)
128	{
129	return event_base_loopexit (x_cur, tv);
130	}
131
132	static void
133	x_cb (struct event *ev, int revents)
134	{
135	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
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_sig (EV_P_ struct ev_signal *w, int revents)
143	{
144	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
145	}
146
147	static void
148	x_cb_io (EV_P_ struct ev_io *w, int revents)
149	{
150	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
151
152	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
153	ev_io_stop (EV_A_ w);
154
155	x_cb (ev, revents);
156	}
157
158	static void
159	x_cb_to (EV_P_ struct ev_timer *w, int revents)
160	{
161	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
162
163	event_del (ev);
164
165	x_cb (ev, revents);
166	}
167
168	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
169	{
170	printf ("event set %p\n", ev);//D
171	if (events & EV_SIGNAL)
172	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
173	else
174	ev_watcher_init (&ev->iosig.io, x_cb_io);
175
176	ev_watcher_init (&ev->to, x_cb_to);
177
178	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
179	ev->ev_fd = fd;
180	ev->ev_events = events;
181	ev->ev_pri = 0;
182	ev->ev_callback = cb;
183	ev->ev_arg = arg;
184	ev->ev_res = 0;
185	}
186
187	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
188	{
189	return event_base_once (x_cur, fd, events, cb, arg, tv);
190	}
191
192	int event_add (struct event ev, struct timeval tv)
193	{
194	printf ("event add %p %p\n", ev, &ev->to);//D
195	dLOOPev;
196
197	/* disable all watchers */
198	event_del (ev);
199
200	if (ev->ev_events & EV_SIGNAL)
201	{
202	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
203	ev_signal_start (EV_A_ &ev->iosig.sig);
204	}
205	else if (ev->ev_events & (EV_READ \| EV_WRITE))
206	{
207	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
208	ev_io_start (EV_A_ &ev->iosig.io);
209	}
210
211	if (tv)
212	{
213	ev_timer_set (&ev->to, tv_get (tv), 0.);
214	ev_timer_start (EV_A_ &ev->to);
215	}
216
217	return 0;
218	}
219
220	int event_del (struct event *ev)
221	{
222	printf ("event del %p\n", ev);//D
223	dLOOPev;
224
225	if (ev->ev_events & EV_SIGNAL)
226	{
227	/* sig */
228	if (ev_is_active (&ev->iosig.sig))
229	ev_signal_stop (EV_A_ &ev->iosig.sig);
230	}
231	else
232	{
233	/* io */
234	if (ev_is_active (&ev->iosig.io))
235	ev_io_stop (EV_A_ &ev->iosig.io);
236	}
237
238	printf ("to %p %d\n", &ev->to, ev->to.active);//D
239	if (ev_is_active (&ev->to))
240	ev_timer_stop (EV_A_ &ev->to);
241
242	return 0;
243	}
244
245	int event_pending (struct event ev, short events, struct timeval tv)
246	{
247	dLOOPev;
248
249	short revents = 0;
250
251	if (ev->ev_events & EV_SIGNAL)
252	{
253	/* sig */
254	if (ev_is_active (&ev->iosig.sig) \|\| ev_is_pending (&ev->iosig.sig))
255	revents \|= EV_SIGNAL;
256	}
257	else
258	{
259	/* io */
260	if (ev_is_active (&ev->iosig.io) \|\| ev_is_pending (&ev->iosig.io))
261	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
262	}
263
264	if (ev->ev_events & EV_TIMEOUT \|\| ev_is_active (&ev->to) \|\| ev_is_pending (&ev->to))
265	{
266	revents \|= EV_TIMEOUT;
267
268	if (tv)
269	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
270	}
271
272	return events & revents;
273	}
274
275	int event_priority_init (int npri)
276	{
277	return event_base_priority_init (x_cur, npri);
278	}
279
280	int event_priority_set (struct event *ev, int pri)
281	{
282	ev->ev_pri = pri;
283
284	return 0;
285	}
286
287	int event_base_set (struct event_base base, struct event ev)
288	{
289	ev->ev_base = base;
290
291	return 0;
292	}
293
294	int event_base_loop (struct event_base *base, int flags)
295	{
296	dLOOPbase;
297
298	ev_loop (EV_A_ flags);
299
300	return 0;
301	}
302
303	int event_base_dispatch (struct event_base *base)
304	{
305	return event_base_loop (base, 0);
306	}
307
308	static void
309	x_loopexit_cb (int revents, void *base)
310	{
311	dLOOPbase;
312
313	ev_unloop (EV_A_ EVUNLOOP_ONCE);
314	}
315
316	int event_base_loopexit (struct event_base base, struct timeval tv)
317	{
318	dLOOPbase;
319	ev_tstamp after = tv_get (tv);
320
321	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
322
323	return -1;
324	}
325
326	struct x_once
327	{
328	int fd;
329	void (cb)(int, short, void );
330	void *arg;
331	};
332
333	static void
334	x_once_cb (int revents, void *arg)
335	{
336	struct x_once *once = arg;
337
338	once->cb (once->fd, revents, once->arg);
339	free (once);
340	}
341
342	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
343	{
344	dLOOPbase;
345	struct x_once *once = malloc (sizeof (struct x_once));
346
347	if (!once)
348	return -1;
349
350	once->fd = fd;
351	once->cb = cb;
352	once->arg = arg;
353
354	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
355
356	return 0;
357	}
358
359	int event_base_priority_init (struct event_base *base, int npri)
360	{
361	/dLOOPbase;/
362
363	return 0;
364	}
365