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"

struct event_base
{
  int dummy;
};

static int x_actives;

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)
{
  if (ev->ev_events & EV_SIGNAL)
    {
      /* sig */
      if (ev_is_active (&ev->iosig.sig))
        {
          ev_signal_stop (&ev->iosig.sig);
          --x_actives;
        }
    }
  else
    {
       /* io */
      if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->iosig.io))
        {
          ev_io_stop (&ev->iosig.io);
          --x_actives;
        }
    }

  revents &= EV_READ | EV_WRITE | EV_TIMEOUT | EV_SIGNAL;

  if (revents & EV_TIMEOUT)
    --x_actives;

  ev->ev_res = revents;
  ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
}

static void
x_cb_io (struct ev_io *w, int revents)
{
  x_cb ((struct event *)(((char *)w) - offsetof (struct event, iosig.io)), revents);
}

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

static void
x_cb_sig (struct ev_signal *w, int revents)
{
  x_cb ((struct event *)(((char *)w) - offsetof (struct event, iosig.sig)), 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)
{
  /* 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->iosig.sig);
      ++x_actives;
    }
  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->iosig.io);
      ++x_actives;
    }

  if (tv)
    {
      ev_timer_set (&ev->to, tv_get (tv), 0.);
      ev_timer_start (&ev->to);
      ++x_actives;
    }

  return 0;
}

int event_del (struct event *ev)
{
  if (ev->ev_events & EV_SIGNAL)
    {
      /* sig */
      if (ev_is_active (&ev->iosig.sig))
        {
          ev_signal_stop (&ev->iosig.sig);
          --x_actives;
        }
    }
  else
    {
      /* io */
      if (ev_is_active (&ev->iosig.io))
        {
          ev_io_stop (&ev->iosig.io);
          --x_actives;
        }
    }

  if (ev_is_active (&ev->to))
    {
      ev_timer_stop (&ev->to);
      --x_actives;
    }

  return 0;
}

int event_pending (struct event *ev, short events, struct timeval *tv)
{
  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); /* 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)
{
  do
    {
      ev_loop (flags | EVLOOP_ONESHOT);
    }
  while (!(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done);

  return 0;
}

int event_base_dispatch (struct event_base *base)
{
  return event_base_loop (base, 0);
}

static void
x_loopexit_cb (int revents, void *arg)
{
  ev_loop_done = 2;
}

int event_base_loopexit (struct event_base *base, struct timeval *tv)
{
  ev_tstamp after = tv_get (tv);

  ev_once (-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)
{
  struct x_once *once = malloc (sizeof (struct x_once));

  if (!once)
    return -1;

  once->fd  = fd;
  once->cb  = cb;
  once->arg = arg;

  ev_once (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)
{
  return 0;
}

Revision:	1.6
Committed:	Sat Nov 3 20:24:42 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+1 -1 lines
Log Message:	do not support multiple event bases. period.
#	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			struct event_base
39			{
40			int dummy;
41			};
42
43			static int x_actives;
44
45			static struct event_base x_base, *x_cur;
46
47			static void
48			tv_set (struct timeval *tv, ev_tstamp at)
49			{
50			tv->tv_sec = (long)at;
51			tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
52			}
53
54			static ev_tstamp
55			tv_get (struct timeval *tv)
56			{
57			if (tv)
58			return tv->tv_sec + tv->tv_usec * 1e-6;
59			else
60			return -1.;
61			}
62
63			#define EVENT_VERSION(a,b) # a "." # b
64
65			const char *event_get_version (void)
66			{
67			return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
68			}
69
70			const char *event_get_method (void)
71			{
72			return "libev";
73			}
74
75			void *event_init (void)
76			{
77	root	1.6	if (!x_cur && ev_init (0))
78	root	1.1	return x_cur = &x_base;
79
80			return 0;
81			}
82
83			void event_base_free (struct event_base *base)
84			{
85			/* nop */
86			}
87
88			int event_dispatch (void)
89			{
90			return event_base_dispatch (x_cur);
91			}
92
93	root	1.5	#ifdef EV_STANDALONE
94	root	1.1	void event_set_log_callback (event_log_cb cb)
95			{
96			/* nop */
97			}
98	root	1.5	#endif
99	root	1.1
100			int event_loop (int flags)
101			{
102			return event_base_loop (x_cur, flags);
103			}
104
105			int event_loopexit (struct timeval *tv)
106			{
107	root	1.5	return event_base_loopexit (x_cur, tv);
108	root	1.1	}
109
110			static void
111			x_cb (struct event *ev, int revents)
112			{
113	root	1.4	if (ev->ev_events & EV_SIGNAL)
114	root	1.1	{
115	root	1.4	/* sig */
116			if (ev_is_active (&ev->iosig.sig))
117			{
118			ev_signal_stop (&ev->iosig.sig);
119			--x_actives;
120			}
121	root	1.1	}
122	root	1.4	else
123	root	1.1	{
124	root	1.4	/* io */
125			if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->iosig.io))
126			{
127			ev_io_stop (&ev->iosig.io);
128			--x_actives;
129			}
130	root	1.1	}
131
132			revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
133
134			if (revents & EV_TIMEOUT)
135			--x_actives;
136
137			ev->ev_res = revents;
138			ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
139			}
140
141			static void
142			x_cb_io (struct ev_io *w, int revents)
143			{
144	root	1.4	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.io)), revents);
145	root	1.1	}
146
147			static void
148			x_cb_to (struct ev_timer *w, int revents)
149			{
150			x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
151			}
152
153			static void
154			x_cb_sig (struct ev_signal *w, int revents)
155			{
156	root	1.4	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
157	root	1.1	}
158
159			void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
160			{
161	root	1.4	if (events & EV_SIGNAL)
162			ev_watcher_init (&ev->iosig.sig, x_cb_sig);
163			else
164			ev_watcher_init (&ev->iosig.io, x_cb_io);
165
166	root	1.1	ev_watcher_init (&ev->to, x_cb_to);
167
168			ev->ev_base = x_cur;
169			ev->ev_fd = fd;
170			ev->ev_events = events;
171			ev->ev_pri = 0;
172			ev->ev_callback = cb;
173			ev->ev_arg = arg;
174			ev->ev_res = 0;
175			}
176
177			int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
178			{
179	root	1.5	return event_base_once (x_cur, fd, events, cb, arg, tv);
180	root	1.1	}
181
182			int event_add (struct event ev, struct timeval tv)
183			{
184	root	1.4	/* disable all watchers */
185			event_del (ev);
186
187			if (ev->ev_events & EV_SIGNAL)
188	root	1.1	{
189	root	1.4	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
190			ev_signal_start (&ev->iosig.sig);
191	root	1.1	++x_actives;
192			}
193	root	1.4	else if (ev->ev_events & (EV_READ \| EV_WRITE))
194	root	1.1	{
195	root	1.4	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
196			ev_io_start (&ev->iosig.io);
197	root	1.1	++x_actives;
198			}
199
200	root	1.4	if (tv)
201	root	1.1	{
202	root	1.4	ev_timer_set (&ev->to, tv_get (tv), 0.);
203			ev_timer_start (&ev->to);
204	root	1.1	++x_actives;
205			}
206
207			return 0;
208			}
209
210			int event_del (struct event *ev)
211			{
212	root	1.4	if (ev->ev_events & EV_SIGNAL)
213			{
214			/* sig */
215			if (ev_is_active (&ev->iosig.sig))
216			{
217			ev_signal_stop (&ev->iosig.sig);
218			--x_actives;
219			}
220			}
221			else
222	root	1.1	{
223	root	1.4	/* io */
224			if (ev_is_active (&ev->iosig.io))
225			{
226			ev_io_stop (&ev->iosig.io);
227			--x_actives;
228			}
229	root	1.1	}
230
231			if (ev_is_active (&ev->to))
232			{
233			ev_timer_stop (&ev->to);
234			--x_actives;
235			}
236
237			return 0;
238			}
239
240			int event_pending (struct event ev, short events, struct timeval tv)
241			{
242	root	1.5	short revents = 0;
243	root	1.1
244	root	1.4	if (ev->ev_events & EV_SIGNAL)
245			{
246			/* sig */
247			if (ev->iosig.sig.pending)
248			revents \|= EV_SIGNAL;
249			}
250			else
251			{
252			/* io */
253			if (ev->iosig.io.pending)
254			revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
255			}
256	root	1.1
257			if (ev->to.pending)
258			{
259			revents \|= EV_TIMEOUT;
260
261			if (tv)
262			tv_set (tv, ev_now); /* not sure if this is right :) */
263			}
264
265			return events & revents;
266			}
267
268			int event_priority_init (int npri)
269			{
270			return event_base_priority_init (x_cur, npri);
271			}
272
273			int event_priority_set (struct event *ev, int pri)
274			{
275			ev->ev_pri = pri;
276
277			return 0;
278			}
279
280			int event_base_set (struct event_base base, struct event ev)
281			{
282			ev->ev_base = base;
283
284			return 0;
285			}
286
287			int event_base_loop (struct event_base *base, int flags)
288			{
289			do
290			{
291			ev_loop (flags \| EVLOOP_ONESHOT);
292			}
293			while (!(flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done);
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 *arg)
305			{
306			ev_loop_done = 2;
307			}
308
309			int event_base_loopexit (struct event_base base, struct timeval tv)
310			{
311			ev_tstamp after = tv_get (tv);
312
313			ev_once (-1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
314	root	1.5
315			return -1;
316	root	1.1	}
317
318			struct x_once
319			{
320			int fd;
321			void (cb)(int, short, void );
322			void *arg;
323			};
324
325			static void
326			x_once_cb (int revents, void *arg)
327			{
328			struct x_once *once = arg;
329
330			once->cb (once->fd, revents, once->arg);
331			free (once);
332			}
333
334			int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
335			{
336			struct x_once *once = malloc (sizeof (struct x_once));
337
338			if (!once)
339			return -1;
340
341			once->fd = fd;
342			once->cb = cb;
343			once->arg = arg;
344
345	root	1.2	ev_once (fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
346	root	1.1
347			return 0;
348			}
349
350			int event_base_priority_init (struct event_base *base, int npri)
351			{
352			return 0;
353			}
354