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)
{
  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)
{
  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;
}

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:	1.19
Committed:	Tue Nov 6 16:51:20 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.18:	+2 -2 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	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
148	}
149
150	static void
151	x_cb_io (EV_P_ struct ev_io *w, int revents)
152	{
153	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
154
155	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
156	ev_io_stop (EV_A_ w);
157
158	x_cb (ev, revents);
159	}
160
161	static void
162	x_cb_to (EV_P_ struct ev_timer *w, int revents)
163	{
164	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
165
166	event_del (ev);
167
168	x_cb (ev, revents);
169	}
170
171	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
172	{
173	if (events & EV_SIGNAL)
174	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
175	else
176	ev_watcher_init (&ev->iosig.io, x_cb_io);
177
178	ev_watcher_init (&ev->to, x_cb_to);
179
180	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
181	ev->ev_fd = fd;
182	ev->ev_events = events;
183	ev->ev_pri = 0;
184	ev->ev_callback = cb;
185	ev->ev_arg = arg;
186	ev->ev_res = 0;
187	}
188
189	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
190	{
191	return event_base_once (x_cur, fd, events, cb, arg, tv);
192	}
193
194	int event_add (struct event ev, struct timeval tv)
195	{
196	dLOOPev;
197
198	/* disable all watchers */
199	event_del (ev);
200
201	if (ev->ev_events & EV_SIGNAL)
202	{
203	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
204	ev_signal_start (EV_A_ &ev->iosig.sig);
205	}
206	else if (ev->ev_events & (EV_READ \| EV_WRITE))
207	{
208	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
209	ev_io_start (EV_A_ &ev->iosig.io);
210	}
211
212	if (tv)
213	{
214	ev_timer_set (&ev->to, tv_get (tv), 0.);
215	ev_timer_start (EV_A_ &ev->to);
216	}
217
218	return 0;
219	}
220
221	int event_del (struct event *ev)
222	{
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 if (ev->ev_events & (EV_READ \| EV_WRITE))
232	{
233	/* io */
234	if (ev_is_active (&ev->iosig.io))
235	ev_io_stop (EV_A_ &ev->iosig.io);
236	}
237
238	if (ev_is_active (&ev->to))
239	ev_timer_stop (EV_A_ &ev->to);
240
241	return 0;
242	}
243
244	int event_pending (struct event ev, short events, struct timeval tv)
245	{
246	short revents = 0;
247	dLOOPev;
248
249
250	if (ev->ev_events & EV_SIGNAL)
251	{
252	/* sig */
253	if (ev_is_active (&ev->iosig.sig) \|\| ev_is_pending (&ev->iosig.sig))
254	revents \|= EV_SIGNAL;
255	}
256	else if (ev->ev_events & (EV_READ \| EV_WRITE))
257	{
258	/* io */
259	if (ev_is_active (&ev->iosig.io) \|\| ev_is_pending (&ev->iosig.io))
260	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
261	}
262
263	if (ev->ev_events & EV_TIMEOUT \|\| ev_is_active (&ev->to) \|\| ev_is_pending (&ev->to))
264	{
265	revents \|= EV_TIMEOUT;
266
267	if (tv)
268	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
269	}
270
271	return events & revents;
272	}
273
274	int event_priority_init (int npri)
275	{
276	return event_base_priority_init (x_cur, npri);
277	}
278
279	int event_priority_set (struct event *ev, int pri)
280	{
281	ev->ev_pri = pri;
282
283	return 0;
284	}
285
286	int event_base_set (struct event_base base, struct event ev)
287	{
288	ev->ev_base = base;
289
290	return 0;
291	}
292
293	int event_base_loop (struct event_base *base, int flags)
294	{
295	dLOOPbase;
296
297	ev_loop (EV_A_ flags);
298
299	return 0;
300	}
301
302	int event_base_dispatch (struct event_base *base)
303	{
304	return event_base_loop (base, 0);
305	}
306
307	static void
308	x_loopexit_cb (int revents, void *base)
309	{
310	dLOOPbase;
311
312	ev_unloop (EV_A_ EVUNLOOP_ONCE);
313	}
314
315	int event_base_loopexit (struct event_base base, struct timeval tv)
316	{
317	ev_tstamp after = tv_get (tv);
318	dLOOPbase;
319
320	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
321
322	return -1;
323	}
324
325	struct x_once
326	{
327	int fd;
328	void (cb)(int, short, void );
329	void *arg;
330	};
331
332	static void
333	x_once_cb (int revents, void *arg)
334	{
335	struct x_once once = (struct x_once )arg;
336
337	once->cb (once->fd, revents, once->arg);
338	free (once);
339	}
340
341	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
342	{
343	struct x_once once = (struct x_once )malloc (sizeof (struct x_once));
344	dLOOPbase;
345
346	if (!once)
347	return -1;
348
349	once->fd = fd;
350	once->cb = cb;
351	once->arg = arg;
352
353	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
354
355	return 0;
356	}
357
358	int event_base_priority_init (struct event_base *base, int npri)
359	{
360	/dLOOPbase;/
361
362	return 0;
363	}
364