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 *
#	User	Rev	Content
1	root	1.1	/*
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	root	1.8	#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	root	1.7
46	root	1.1	struct event_base
47			{
48	root	1.8	#ifdef EV_MULTIPLICITY
49			struct ev_loop *loop;
50			#endif
51	root	1.1	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	root	1.6	if (!x_cur && ev_init (0))
87	root	1.1	return x_cur = &x_base;
88
89			return 0;
90			}
91
92			void event_base_free (struct event_base *base)
93			{
94	root	1.8	dLOOPbase;
95
96	root	1.1	/* nop */
97			}
98
99			int event_dispatch (void)
100			{
101			return event_base_dispatch (x_cur);
102			}
103
104	root	1.5	#ifdef EV_STANDALONE
105	root	1.1	void event_set_log_callback (event_log_cb cb)
106			{
107			/* nop */
108			}
109	root	1.5	#endif
110	root	1.1
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	root	1.5	return event_base_loopexit (x_cur, tv);
119	root	1.1	}
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	root	1.7	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
132	root	1.1	{
133	root	1.7	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
134	root	1.1	}
135
136			static void
137	root	1.7	x_cb_io (EV_P_ struct ev_io *w, int revents)
138	root	1.1	{
139	root	1.7	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	root	1.1	}
146
147			static void
148	root	1.7	x_cb_to (EV_P_ struct ev_timer *w, int revents)
149	root	1.1	{
150	root	1.7	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
151	root	1.1	}
152
153			void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
154			{
155	root	1.4	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	root	1.1	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	root	1.5	return event_base_once (x_cur, fd, events, cb, arg, tv);
174	root	1.1	}
175
176			int event_add (struct event ev, struct timeval tv)
177			{
178	root	1.7	dLOOPev;
179
180	root	1.4	/* disable all watchers */
181			event_del (ev);
182
183			if (ev->ev_events & EV_SIGNAL)
184	root	1.1	{
185	root	1.4	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
186	root	1.7	ev_signal_start (EV_A_ &ev->iosig.sig);
187	root	1.1	}
188	root	1.4	else if (ev->ev_events & (EV_READ \| EV_WRITE))
189	root	1.1	{
190	root	1.4	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
191	root	1.7	ev_io_start (EV_A_ &ev->iosig.io);
192	root	1.1	}
193
194	root	1.4	if (tv)
195	root	1.1	{
196	root	1.4	ev_timer_set (&ev->to, tv_get (tv), 0.);
197	root	1.7	ev_timer_start (EV_A_ &ev->to);
198	root	1.1	}
199
200			return 0;
201			}
202
203			int event_del (struct event *ev)
204			{
205	root	1.7	dLOOPev;
206
207	root	1.4	if (ev->ev_events & EV_SIGNAL)
208			{
209			/* sig */
210			if (ev_is_active (&ev->iosig.sig))
211	root	1.7	ev_signal_stop (EV_A_ &ev->iosig.sig);
212	root	1.4	}
213			else
214	root	1.1	{
215	root	1.4	/* io */
216			if (ev_is_active (&ev->iosig.io))
217	root	1.7	ev_io_stop (EV_A_ &ev->iosig.io);
218	root	1.1	}
219
220			if (ev_is_active (&ev->to))
221	root	1.7	ev_timer_stop (EV_A_ &ev->to);
222	root	1.1
223			return 0;
224			}
225
226			int event_pending (struct event ev, short events, struct timeval tv)
227			{
228	root	1.7	dLOOPev;
229
230	root	1.5	short revents = 0;
231	root	1.1
232	root	1.4	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	root	1.1
245			if (ev->to.pending)
246			{
247			revents \|= EV_TIMEOUT;
248
249			if (tv)
250	root	1.7	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
251	root	1.1	}
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	root	1.7	dLOOPbase;
278	root	1.8
279			ev_loop (EV_A_ flags);
280	root	1.1
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	root	1.7	x_loopexit_cb (EV_P_ int revents, void *arg)
291	root	1.1	{
292	root	1.7	ev_unloop (EV_A_ 2);
293	root	1.1	}
294
295			int event_base_loopexit (struct event_base base, struct timeval tv)
296			{
297	root	1.7	dLOOPbase;
298	root	1.1	ev_tstamp after = tv_get (tv);
299
300	root	1.7	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
301	root	1.5
302			return -1;
303	root	1.1	}
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	root	1.7	dLOOPbase;
324	root	1.1	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	root	1.7	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
334	root	1.1
335			return 0;
336			}
337
338			int event_base_priority_init (struct event_base *base, int npri)
339			{
340	root	1.7	dLOOPbase;
341
342	root	1.1	return 0;
343			}
344