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 "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 = 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
  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:	1.10
Committed:	Sun Nov 4 15:58:50 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+9 -3 lines
Log Message:	better destroy support, separate into default loop and additional loops
#	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 "event.h"
38
39	#if EV_MULTIPLICITY
40	# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
41	# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
42	#else
43	# define dLOOPev
44	# define dLOOPbase
45	#endif
46
47	/* never accessed, will always be cast from/to ev_loop */
48	struct event_base
49	{
50	int dummy;
51	};
52
53	static struct event_base *x_cur;
54
55	static void
56	tv_set (struct timeval *tv, ev_tstamp at)
57	{
58	tv->tv_sec = (long)at;
59	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
60	}
61
62	static ev_tstamp
63	tv_get (struct timeval *tv)
64	{
65	if (tv)
66	return tv->tv_sec + tv->tv_usec * 1e-6;
67	else
68	return -1.;
69	}
70
71	#define EVENT_VERSION(a,b) # a "." # b
72
73	const char *event_get_version (void)
74	{
75	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
76	}
77
78	const char *event_get_method (void)
79	{
80	return "libev";
81	}
82
83	void *event_init (void)
84	{
85	#if EV_MULTIPLICITY
86	if (x_cur)
87	x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
88	else
89	x_cur = ev_default_loop (EVMETHOD_AUTO);
90	#else
91	assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));
92
93	x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
94	#endif
95
96	return x_cur;
97	}
98
99	void event_base_free (struct event_base *base)
100	{
101	dLOOPbase;
102
103	#if EV_MULTIPLICITY
104	ev_loop_delete (loop);
105	#endif
106	}
107
108	int event_dispatch (void)
109	{
110	return event_base_dispatch (x_cur);
111	}
112
113	#ifdef EV_STANDALONE
114	void event_set_log_callback (event_log_cb cb)
115	{
116	/* nop */
117	}
118	#endif
119
120	int event_loop (int flags)
121	{
122	return event_base_loop (x_cur, flags);
123	}
124
125	int event_loopexit (struct timeval *tv)
126	{
127	return event_base_loopexit (x_cur, tv);
128	}
129
130	static void
131	x_cb (struct event *ev, int revents)
132	{
133	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
134
135	ev->ev_res = revents;
136	ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
137	}
138
139	static void
140	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
141	{
142	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
143	}
144
145	static void
146	x_cb_io (EV_P_ struct ev_io *w, int revents)
147	{
148	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
149
150	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
151	ev_io_stop (EV_A_ w);
152
153	x_cb (ev, revents);
154	}
155
156	static void
157	x_cb_to (EV_P_ struct ev_timer *w, int revents)
158	{
159	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
160	}
161
162	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
163	{
164	if (!ev->initialised)
165	{
166	ev->initialised = 1;
167
168	if (events & EV_SIGNAL)
169	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
170	else
171	ev_watcher_init (&ev->iosig.io, x_cb_io);
172
173	ev_watcher_init (&ev->to, x_cb_to);
174	}
175
176	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
177	ev->ev_fd = fd;
178	ev->ev_events = events;
179	ev->ev_pri = 0;
180	ev->ev_callback = cb;
181	ev->ev_arg = arg;
182	ev->ev_res = 0;
183	}
184
185	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
186	{
187	return event_base_once (x_cur, fd, events, cb, arg, tv);
188	}
189
190	int event_add (struct event ev, struct timeval tv)
191	{
192	dLOOPev;
193
194	/* disable all watchers */
195	event_del (ev);
196
197	if (ev->ev_events & EV_SIGNAL)
198	{
199	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
200	ev_signal_start (EV_A_ &ev->iosig.sig);
201	}
202	else if (ev->ev_events & (EV_READ \| EV_WRITE))
203	{
204	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
205	ev_io_start (EV_A_ &ev->iosig.io);
206	}
207
208	if (tv)
209	{
210	ev_timer_set (&ev->to, tv_get (tv), 0.);
211	ev_timer_start (EV_A_ &ev->to);
212	}
213
214	return 0;
215	}
216
217	int event_del (struct event *ev)
218	{
219	dLOOPev;
220
221	if (ev->ev_events & EV_SIGNAL)
222	{
223	/* sig */
224	if (ev_is_active (&ev->iosig.sig))
225	ev_signal_stop (EV_A_ &ev->iosig.sig);
226	}
227	else
228	{
229	/* io */
230	if (ev_is_active (&ev->iosig.io))
231	ev_io_stop (EV_A_ &ev->iosig.io);
232	}
233
234	if (ev_is_active (&ev->to))
235	ev_timer_stop (EV_A_ &ev->to);
236
237	return 0;
238	}
239
240	int event_pending (struct event ev, short events, struct timeval tv)
241	{
242	dLOOPev;
243
244	short revents = 0;
245
246	if (ev->ev_events & EV_SIGNAL)
247	{
248	/* sig */
249	if (ev->iosig.sig.pending)
250	revents \|= EV_SIGNAL;
251	}
252	else
253	{
254	/* io */
255	if (ev->iosig.io.pending)
256	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
257	}
258
259	if (ev->to.pending)
260	{
261	revents \|= EV_TIMEOUT;
262
263	if (tv)
264	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
265	}
266
267	return events & revents;
268	}
269
270	int event_priority_init (int npri)
271	{
272	return event_base_priority_init (x_cur, npri);
273	}
274
275	int event_priority_set (struct event *ev, int pri)
276	{
277	ev->ev_pri = pri;
278
279	return 0;
280	}
281
282	int event_base_set (struct event_base base, struct event ev)
283	{
284	ev->ev_base = base;
285
286	return 0;
287	}
288
289	int event_base_loop (struct event_base *base, int flags)
290	{
291	dLOOPbase;
292
293	ev_loop (EV_A_ flags);
294
295	return 0;
296	}
297
298	int event_base_dispatch (struct event_base *base)
299	{
300	return event_base_loop (base, 0);
301	}
302
303	static void
304	x_loopexit_cb (int revents, void *base)
305	{
306	dLOOPbase;
307
308	ev_unloop (EV_A_ EVUNLOOP_ONCE);
309	}
310
311	int event_base_loopexit (struct event_base base, struct timeval tv)
312	{
313	dLOOPbase;
314	ev_tstamp after = tv_get (tv);
315
316	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
317
318	return -1;
319	}
320
321	struct x_once
322	{
323	int fd;
324	void (cb)(int, short, void );
325	void *arg;
326	};
327
328	static void
329	x_once_cb (int revents, void *arg)
330	{
331	struct x_once *once = arg;
332
333	once->cb (once->fd, revents, once->arg);
334	free (once);
335	}
336
337	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
338	{
339	dLOOPbase;
340	struct x_once *once = malloc (sizeof (struct x_once));
341
342	if (!once)
343	return -1;
344
345	once->fd = fd;
346	once->cb = cb;
347	once->arg = arg;
348
349	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
350
351	return 0;
352	}
353
354	int event_base_priority_init (struct event_base *base, int npri)
355	{
356	dLOOPbase;
357
358	return 0;
359	}
360