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"

#ifdef EV_MULTIPLICITY
# define dLOOPev struct ev_loop *loop = ev->ev_base->loop
# define dLOOPbase struct ev_loop *loop = base->loop
#else
# define dLOOPev
# define dLOOPbase
#endif

struct event_base
{
#ifdef EV_MULTIPLICITY
  struct ev_loop *loop;
#endif
  int dummy;
};

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)
{
  dLOOPbase;

  /* 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)
{
  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 (w);

  x_cb (ev, revents);
}

static void
x_cb_to (EV_P_ struct ev_timer *w, int revents)
{
  x_cb ((struct event *)(((char *)w) - offsetof (struct event, to)), 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)
{
  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
    {
      /* 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)
{
  dLOOPev;

  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 (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 (EV_P_ int revents, void *arg)
{
  ev_unloop (EV_A_ 2);
}

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:	1.8
Committed:	Sat Nov 3 22:10:39 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.7:	+14 -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	#ifdef EV_MULTIPLICITY
39	# define dLOOPev struct ev_loop *loop = ev->ev_base->loop
40	# define dLOOPbase struct ev_loop *loop = base->loop
41	#else
42	# define dLOOPev
43	# define dLOOPbase
44	#endif
45
46	struct event_base
47	{
48	#ifdef EV_MULTIPLICITY
49	struct ev_loop *loop;
50	#endif
51	int dummy;
52	};
53
54	static struct event_base x_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 (!x_cur && ev_init (0))
87	return x_cur = &x_base;
88
89	return 0;
90	}
91
92	void event_base_free (struct event_base *base)
93	{
94	dLOOPbase;
95
96	/* nop */
97	}
98
99	int event_dispatch (void)
100	{
101	return event_base_dispatch (x_cur);
102	}
103
104	#ifdef EV_STANDALONE
105	void event_set_log_callback (event_log_cb cb)
106	{
107	/* nop */
108	}
109	#endif
110
111	int event_loop (int flags)
112	{
113	return event_base_loop (x_cur, flags);
114	}
115
116	int event_loopexit (struct timeval *tv)
117	{
118	return event_base_loopexit (x_cur, tv);
119	}
120
121	static void
122	x_cb (struct event *ev, int revents)
123	{
124	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
125
126	ev->ev_res = revents;
127	ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
128	}
129
130	static void
131	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
132	{
133	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
134	}
135
136	static void
137	x_cb_io (EV_P_ struct ev_io *w, int revents)
138	{
139	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
140
141	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
142	ev_io_stop (w);
143
144	x_cb (ev, revents);
145	}
146
147	static void
148	x_cb_to (EV_P_ struct ev_timer *w, int revents)
149	{
150	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
151	}
152
153	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
154	{
155	if (events & EV_SIGNAL)
156	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
157	else
158	ev_watcher_init (&ev->iosig.io, x_cb_io);
159
160	ev_watcher_init (&ev->to, x_cb_to);
161
162	ev->ev_base = x_cur;
163	ev->ev_fd = fd;
164	ev->ev_events = events;
165	ev->ev_pri = 0;
166	ev->ev_callback = cb;
167	ev->ev_arg = arg;
168	ev->ev_res = 0;
169	}
170
171	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
172	{
173	return event_base_once (x_cur, fd, events, cb, arg, tv);
174	}
175
176	int event_add (struct event ev, struct timeval tv)
177	{
178	dLOOPev;
179
180	/* disable all watchers */
181	event_del (ev);
182
183	if (ev->ev_events & EV_SIGNAL)
184	{
185	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
186	ev_signal_start (EV_A_ &ev->iosig.sig);
187	}
188	else if (ev->ev_events & (EV_READ \| EV_WRITE))
189	{
190	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
191	ev_io_start (EV_A_ &ev->iosig.io);
192	}
193
194	if (tv)
195	{
196	ev_timer_set (&ev->to, tv_get (tv), 0.);
197	ev_timer_start (EV_A_ &ev->to);
198	}
199
200	return 0;
201	}
202
203	int event_del (struct event *ev)
204	{
205	dLOOPev;
206
207	if (ev->ev_events & EV_SIGNAL)
208	{
209	/* sig */
210	if (ev_is_active (&ev->iosig.sig))
211	ev_signal_stop (EV_A_ &ev->iosig.sig);
212	}
213	else
214	{
215	/* io */
216	if (ev_is_active (&ev->iosig.io))
217	ev_io_stop (EV_A_ &ev->iosig.io);
218	}
219
220	if (ev_is_active (&ev->to))
221	ev_timer_stop (EV_A_ &ev->to);
222
223	return 0;
224	}
225
226	int event_pending (struct event ev, short events, struct timeval tv)
227	{
228	dLOOPev;
229
230	short revents = 0;
231
232	if (ev->ev_events & EV_SIGNAL)
233	{
234	/* sig */
235	if (ev->iosig.sig.pending)
236	revents \|= EV_SIGNAL;
237	}
238	else
239	{
240	/* io */
241	if (ev->iosig.io.pending)
242	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
243	}
244
245	if (ev->to.pending)
246	{
247	revents \|= EV_TIMEOUT;
248
249	if (tv)
250	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
251	}
252
253	return events & revents;
254	}
255
256	int event_priority_init (int npri)
257	{
258	return event_base_priority_init (x_cur, npri);
259	}
260
261	int event_priority_set (struct event *ev, int pri)
262	{
263	ev->ev_pri = pri;
264
265	return 0;
266	}
267
268	int event_base_set (struct event_base base, struct event ev)
269	{
270	ev->ev_base = base;
271
272	return 0;
273	}
274
275	int event_base_loop (struct event_base *base, int flags)
276	{
277	dLOOPbase;
278
279	ev_loop (EV_A_ flags);
280
281	return 0;
282	}
283
284	int event_base_dispatch (struct event_base *base)
285	{
286	return event_base_loop (base, 0);
287	}
288
289	static void
290	x_loopexit_cb (EV_P_ int revents, void *arg)
291	{
292	ev_unloop (EV_A_ 2);
293	}
294
295	int event_base_loopexit (struct event_base base, struct timeval tv)
296	{
297	dLOOPbase;
298	ev_tstamp after = tv_get (tv);
299
300	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
301
302	return -1;
303	}
304
305	struct x_once
306	{
307	int fd;
308	void (cb)(int, short, void );
309	void *arg;
310	};
311
312	static void
313	x_once_cb (int revents, void *arg)
314	{
315	struct x_once *once = arg;
316
317	once->cb (once->fd, revents, once->arg);
318	free (once);
319	}
320
321	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
322	{
323	dLOOPbase;
324	struct x_once *once = malloc (sizeof (struct x_once));
325
326	if (!once)
327	return -1;
328
329	once->fd = fd;
330	once->cb = cb;
331	once->arg = arg;
332
333	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
334
335	return 0;
336	}
337
338	int event_base_priority_init (struct event_base *base, int npri)
339	{
340	dLOOPbase;
341
342	return 0;
343	}
344