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"

#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_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
  x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
#else
  x_cur = &x_base;
#endif

  return x_cur;
}

void event_base_free (struct event_base *base)
{
  dLOOPbase;

#if EV_MULTIPLICITY
  ev_loop_delete (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)
{
  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 (!ev->initialised)
    {
      ev->initialised = 1;

      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
    {
      /* 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 (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:	1.9
Committed:	Sun Nov 4 00:24:17 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+29 -19 lines
Log Message:	wow the event api is broken
#	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	#if EV_MULTIPLICITY
39	# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
40	# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
41	#else
42	# define dLOOPev
43	# define dLOOPbase
44	#endif
45
46	/* never accessed, will always be cast from/to ev_loop */
47	struct event_base
48	{
49	int dummy;
50	};
51
52	static struct event_base x_base, *x_cur;
53
54	static void
55	tv_set (struct timeval *tv, ev_tstamp at)
56	{
57	tv->tv_sec = (long)at;
58	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
59	}
60
61	static ev_tstamp
62	tv_get (struct timeval *tv)
63	{
64	if (tv)
65	return tv->tv_sec + tv->tv_usec * 1e-6;
66	else
67	return -1.;
68	}
69
70	#define EVENT_VERSION(a,b) # a "." # b
71
72	const char *event_get_version (void)
73	{
74	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
75	}
76
77	const char *event_get_method (void)
78	{
79	return "libev";
80	}
81
82	void *event_init (void)
83	{
84	#if EV_MULTIPLICITY
85	x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
86	#else
87	x_cur = &x_base;
88	#endif
89
90	return x_cur;
91	}
92
93	void event_base_free (struct event_base *base)
94	{
95	dLOOPbase;
96
97	#if EV_MULTIPLICITY
98	ev_loop_delete (loop);
99	#endif
100	}
101
102	int event_dispatch (void)
103	{
104	return event_base_dispatch (x_cur);
105	}
106
107	#ifdef EV_STANDALONE
108	void event_set_log_callback (event_log_cb cb)
109	{
110	/* nop */
111	}
112	#endif
113
114	int event_loop (int flags)
115	{
116	return event_base_loop (x_cur, flags);
117	}
118
119	int event_loopexit (struct timeval *tv)
120	{
121	return event_base_loopexit (x_cur, tv);
122	}
123
124	static void
125	x_cb (struct event *ev, int revents)
126	{
127	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
128
129	ev->ev_res = revents;
130	ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
131	}
132
133	static void
134	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
135	{
136	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
137	}
138
139	static void
140	x_cb_io (EV_P_ struct ev_io *w, int revents)
141	{
142	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
143
144	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
145	ev_io_stop (EV_A_ w);
146
147	x_cb (ev, revents);
148	}
149
150	static void
151	x_cb_to (EV_P_ struct ev_timer *w, int revents)
152	{
153	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
154	}
155
156	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
157	{
158	if (!ev->initialised)
159	{
160	ev->initialised = 1;
161
162	if (events & EV_SIGNAL)
163	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
164	else
165	ev_watcher_init (&ev->iosig.io, x_cb_io);
166
167	ev_watcher_init (&ev->to, x_cb_to);
168	}
169
170	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
171	ev->ev_fd = fd;
172	ev->ev_events = events;
173	ev->ev_pri = 0;
174	ev->ev_callback = cb;
175	ev->ev_arg = arg;
176	ev->ev_res = 0;
177	}
178
179	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
180	{
181	return event_base_once (x_cur, fd, events, cb, arg, tv);
182	}
183
184	int event_add (struct event ev, struct timeval tv)
185	{
186	dLOOPev;
187
188	/* disable all watchers */
189	event_del (ev);
190
191	if (ev->ev_events & EV_SIGNAL)
192	{
193	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
194	ev_signal_start (EV_A_ &ev->iosig.sig);
195	}
196	else if (ev->ev_events & (EV_READ \| EV_WRITE))
197	{
198	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
199	ev_io_start (EV_A_ &ev->iosig.io);
200	}
201
202	if (tv)
203	{
204	ev_timer_set (&ev->to, tv_get (tv), 0.);
205	ev_timer_start (EV_A_ &ev->to);
206	}
207
208	return 0;
209	}
210
211	int event_del (struct event *ev)
212	{
213	dLOOPev;
214
215	if (ev->ev_events & EV_SIGNAL)
216	{
217	/* sig */
218	if (ev_is_active (&ev->iosig.sig))
219	ev_signal_stop (EV_A_ &ev->iosig.sig);
220	}
221	else
222	{
223	/* io */
224	if (ev_is_active (&ev->iosig.io))
225	ev_io_stop (EV_A_ &ev->iosig.io);
226	}
227
228	if (ev_is_active (&ev->to))
229	ev_timer_stop (EV_A_ &ev->to);
230
231	return 0;
232	}
233
234	int event_pending (struct event ev, short events, struct timeval tv)
235	{
236	dLOOPev;
237
238	short revents = 0;
239
240	if (ev->ev_events & EV_SIGNAL)
241	{
242	/* sig */
243	if (ev->iosig.sig.pending)
244	revents \|= EV_SIGNAL;
245	}
246	else
247	{
248	/* io */
249	if (ev->iosig.io.pending)
250	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
251	}
252
253	if (ev->to.pending)
254	{
255	revents \|= EV_TIMEOUT;
256
257	if (tv)
258	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
259	}
260
261	return events & revents;
262	}
263
264	int event_priority_init (int npri)
265	{
266	return event_base_priority_init (x_cur, npri);
267	}
268
269	int event_priority_set (struct event *ev, int pri)
270	{
271	ev->ev_pri = pri;
272
273	return 0;
274	}
275
276	int event_base_set (struct event_base base, struct event ev)
277	{
278	ev->ev_base = base;
279
280	return 0;
281	}
282
283	int event_base_loop (struct event_base *base, int flags)
284	{
285	dLOOPbase;
286
287	ev_loop (EV_A_ flags);
288
289	return 0;
290	}
291
292	int event_base_dispatch (struct event_base *base)
293	{
294	return event_base_loop (base, 0);
295	}
296
297	static void
298	x_loopexit_cb (int revents, void *base)
299	{
300	dLOOPbase;
301
302	ev_unloop (EV_A_ EVUNLOOP_ONCE);
303	}
304
305	int event_base_loopexit (struct event_base base, struct timeval tv)
306	{
307	dLOOPbase;
308	ev_tstamp after = tv_get (tv);
309
310	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
311
312	return -1;
313	}
314
315	struct x_once
316	{
317	int fd;
318	void (cb)(int, short, void );
319	void *arg;
320	};
321
322	static void
323	x_once_cb (int revents, void *arg)
324	{
325	struct x_once *once = arg;
326
327	once->cb (once->fd, revents, once->arg);
328	free (once);
329	}
330
331	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
332	{
333	dLOOPbase;
334	struct x_once *once = malloc (sizeof (struct x_once));
335
336	if (!once)
337	return -1;
338
339	once->fd = fd;
340	once->cb = cb;
341	once->arg = arg;
342
343	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
344
345	return 0;
346	}
347
348	int event_base_priority_init (struct event_base *base, int npri)
349	{
350	dLOOPbase;
351
352	return 0;
353	}
354