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"

#define dLOOPev
#define dLOOPbase

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 (!x_cur && ev_init (0))
    return x_cur = &x_base;

  return 0;
}

void event_base_free (struct event_base *base)
{
  /* 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 | EVLOOP_ONESHOT);

  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:	1.7
Committed:	Sat Nov 3 21:58:51 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+37 -58 lines
Log Message:	prepare for multiple bases
#	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	#define dLOOPev
39	#define dLOOPbase
40
41	struct event_base
42	{
43	int dummy;
44	};
45
46	static struct event_base x_base, *x_cur;
47
48	static void
49	tv_set (struct timeval *tv, ev_tstamp at)
50	{
51	tv->tv_sec = (long)at;
52	tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
53	}
54
55	static ev_tstamp
56	tv_get (struct timeval *tv)
57	{
58	if (tv)
59	return tv->tv_sec + tv->tv_usec * 1e-6;
60	else
61	return -1.;
62	}
63
64	#define EVENT_VERSION(a,b) # a "." # b
65
66	const char *event_get_version (void)
67	{
68	return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
69	}
70
71	const char *event_get_method (void)
72	{
73	return "libev";
74	}
75
76	void *event_init (void)
77	{
78	if (!x_cur && ev_init (0))
79	return x_cur = &x_base;
80
81	return 0;
82	}
83
84	void event_base_free (struct event_base *base)
85	{
86	/* nop */
87	}
88
89	int event_dispatch (void)
90	{
91	return event_base_dispatch (x_cur);
92	}
93
94	#ifdef EV_STANDALONE
95	void event_set_log_callback (event_log_cb cb)
96	{
97	/* nop */
98	}
99	#endif
100
101	int event_loop (int flags)
102	{
103	return event_base_loop (x_cur, flags);
104	}
105
106	int event_loopexit (struct timeval *tv)
107	{
108	return event_base_loopexit (x_cur, tv);
109	}
110
111	static void
112	x_cb (struct event *ev, int revents)
113	{
114	revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
115
116	ev->ev_res = revents;
117	ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
118	}
119
120	static void
121	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
122	{
123	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
124	}
125
126	static void
127	x_cb_io (EV_P_ struct ev_io *w, int revents)
128	{
129	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
130
131	if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
132	ev_io_stop (w);
133
134	x_cb (ev, revents);
135	}
136
137	static void
138	x_cb_to (EV_P_ struct ev_timer *w, int revents)
139	{
140	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
141	}
142
143	void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
144	{
145	if (events & EV_SIGNAL)
146	ev_watcher_init (&ev->iosig.sig, x_cb_sig);
147	else
148	ev_watcher_init (&ev->iosig.io, x_cb_io);
149
150	ev_watcher_init (&ev->to, x_cb_to);
151
152	ev->ev_base = x_cur;
153	ev->ev_fd = fd;
154	ev->ev_events = events;
155	ev->ev_pri = 0;
156	ev->ev_callback = cb;
157	ev->ev_arg = arg;
158	ev->ev_res = 0;
159	}
160
161	int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
162	{
163	return event_base_once (x_cur, fd, events, cb, arg, tv);
164	}
165
166	int event_add (struct event ev, struct timeval tv)
167	{
168	dLOOPev;
169
170	/* disable all watchers */
171	event_del (ev);
172
173	if (ev->ev_events & EV_SIGNAL)
174	{
175	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
176	ev_signal_start (EV_A_ &ev->iosig.sig);
177	}
178	else if (ev->ev_events & (EV_READ \| EV_WRITE))
179	{
180	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
181	ev_io_start (EV_A_ &ev->iosig.io);
182	}
183
184	if (tv)
185	{
186	ev_timer_set (&ev->to, tv_get (tv), 0.);
187	ev_timer_start (EV_A_ &ev->to);
188	}
189
190	return 0;
191	}
192
193	int event_del (struct event *ev)
194	{
195	dLOOPev;
196
197	if (ev->ev_events & EV_SIGNAL)
198	{
199	/* sig */
200	if (ev_is_active (&ev->iosig.sig))
201	ev_signal_stop (EV_A_ &ev->iosig.sig);
202	}
203	else
204	{
205	/* io */
206	if (ev_is_active (&ev->iosig.io))
207	ev_io_stop (EV_A_ &ev->iosig.io);
208	}
209
210	if (ev_is_active (&ev->to))
211	ev_timer_stop (EV_A_ &ev->to);
212
213	return 0;
214	}
215
216	int event_pending (struct event ev, short events, struct timeval tv)
217	{
218	dLOOPev;
219
220	short revents = 0;
221
222	if (ev->ev_events & EV_SIGNAL)
223	{
224	/* sig */
225	if (ev->iosig.sig.pending)
226	revents \|= EV_SIGNAL;
227	}
228	else
229	{
230	/* io */
231	if (ev->iosig.io.pending)
232	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
233	}
234
235	if (ev->to.pending)
236	{
237	revents \|= EV_TIMEOUT;
238
239	if (tv)
240	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
241	}
242
243	return events & revents;
244	}
245
246	int event_priority_init (int npri)
247	{
248	return event_base_priority_init (x_cur, npri);
249	}
250
251	int event_priority_set (struct event *ev, int pri)
252	{
253	ev->ev_pri = pri;
254
255	return 0;
256	}
257
258	int event_base_set (struct event_base base, struct event ev)
259	{
260	ev->ev_base = base;
261
262	return 0;
263	}
264
265	int event_base_loop (struct event_base *base, int flags)
266	{
267	dLOOPbase;
268	ev_loop (EV_A_ flags \| EVLOOP_ONESHOT);
269
270	return 0;
271	}
272
273	int event_base_dispatch (struct event_base *base)
274	{
275	return event_base_loop (base, 0);
276	}
277
278	static void
279	x_loopexit_cb (EV_P_ int revents, void *arg)
280	{
281	ev_unloop (EV_A_ 2);
282	}
283
284	int event_base_loopexit (struct event_base base, struct timeval tv)
285	{
286	dLOOPbase;
287	ev_tstamp after = tv_get (tv);
288
289	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
290
291	return -1;
292	}
293
294	struct x_once
295	{
296	int fd;
297	void (cb)(int, short, void );
298	void *arg;
299	};
300
301	static void
302	x_once_cb (int revents, void *arg)
303	{
304	struct x_once *once = arg;
305
306	once->cb (once->fd, revents, once->arg);
307	free (once);
308	}
309
310	int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
311	{
312	dLOOPbase;
313	struct x_once *once = malloc (sizeof (struct x_once));
314
315	if (!once)
316	return -1;
317
318	once->fd = fd;
319	once->cb = cb;
320	once->arg = arg;
321
322	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
323
324	return 0;
325	}
326
327	int event_base_priority_init (struct event_base *base, int npri)
328	{
329	dLOOPbase;
330
331	return 0;
332	}
333