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 (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);
}

void event_set_log_callback (event_log_cb cb)
{
  /* nop */
}

int event_loop (int flags)
{
  return event_base_loop (x_cur, flags);
}

int event_loopexit (struct timeval *tv)
{
  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)
{
  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;

  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);
}

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:	1.4
Committed:	Fri Nov 2 13:08:51 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+61 -53 lines
Log Message:	improve event compatibility, make watchers much smaller by union'ising io and sig watchers
#	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			if (ev_init (0))
78			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			void event_set_log_callback (event_log_cb cb)
94			{
95			/* nop */
96			}
97
98			int event_loop (int flags)
99			{
100			return event_base_loop (x_cur, flags);
101			}
102
103			int event_loopexit (struct timeval *tv)
104			{
105			event_base_loopexit (x_cur, tv);
106			}
107
108			static void
109			x_cb (struct event *ev, int revents)
110			{
111	root	1.4	if (ev->ev_events & EV_SIGNAL)
112	root	1.1	{
113	root	1.4	/* sig */
114			if (ev_is_active (&ev->iosig.sig))
115			{
116			ev_signal_stop (&ev->iosig.sig);
117			--x_actives;
118			}
119	root	1.1	}
120	root	1.4	else
121	root	1.1	{
122	root	1.4	/* io */
123			if (!(ev->ev_events & EV_PERSIST) && ev_is_active (&ev->iosig.io))
124			{
125			ev_io_stop (&ev->iosig.io);
126			--x_actives;
127			}
128	root	1.1	}
129
130			revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
131
132			if (revents & EV_TIMEOUT)
133			--x_actives;
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_io (struct ev_io *w, int revents)
141			{
142	root	1.4	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.io)), revents);
143	root	1.1	}
144
145			static void
146			x_cb_to (struct ev_timer *w, int revents)
147			{
148			x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
149			}
150
151			static void
152			x_cb_sig (struct ev_signal *w, int revents)
153			{
154	root	1.4	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
155	root	1.1	}
156
157			void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
158			{
159	root	1.4	if (events & EV_SIGNAL)
160			ev_watcher_init (&ev->iosig.sig, x_cb_sig);
161			else
162			ev_watcher_init (&ev->iosig.io, x_cb_io);
163
164	root	1.1	ev_watcher_init (&ev->to, x_cb_to);
165
166			ev->ev_base = x_cur;
167			ev->ev_fd = fd;
168			ev->ev_events = events;
169			ev->ev_pri = 0;
170			ev->ev_callback = cb;
171			ev->ev_arg = arg;
172			ev->ev_res = 0;
173			}
174
175			int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
176			{
177			event_base_once (x_cur, fd, events, cb, arg, tv);
178			}
179
180			int event_add (struct event ev, struct timeval tv)
181			{
182	root	1.4	/* disable all watchers */
183			event_del (ev);
184
185			if (ev->ev_events & EV_SIGNAL)
186	root	1.1	{
187	root	1.4	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
188			ev_signal_start (&ev->iosig.sig);
189	root	1.1	++x_actives;
190			}
191	root	1.4	else if (ev->ev_events & (EV_READ \| EV_WRITE))
192	root	1.1	{
193	root	1.4	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
194			ev_io_start (&ev->iosig.io);
195	root	1.1	++x_actives;
196			}
197
198	root	1.4	if (tv)
199	root	1.1	{
200	root	1.4	ev_timer_set (&ev->to, tv_get (tv), 0.);
201			ev_timer_start (&ev->to);
202	root	1.1	++x_actives;
203			}
204
205			return 0;
206			}
207
208			int event_del (struct event *ev)
209			{
210	root	1.4	if (ev->ev_events & EV_SIGNAL)
211			{
212			/* sig */
213			if (ev_is_active (&ev->iosig.sig))
214			{
215			ev_signal_stop (&ev->iosig.sig);
216			--x_actives;
217			}
218			}
219			else
220	root	1.1	{
221	root	1.4	/* io */
222			if (ev_is_active (&ev->iosig.io))
223			{
224			ev_io_stop (&ev->iosig.io);
225			--x_actives;
226			}
227	root	1.1	}
228
229			if (ev_is_active (&ev->to))
230			{
231			ev_timer_stop (&ev->to);
232			--x_actives;
233			}
234
235			return 0;
236			}
237
238			int event_pending (struct event ev, short events, struct timeval tv)
239			{
240			short revents;
241
242	root	1.4	if (ev->ev_events & EV_SIGNAL)
243			{
244			/* sig */
245			if (ev->iosig.sig.pending)
246			revents \|= EV_SIGNAL;
247			}
248			else
249			{
250			/* io */
251			if (ev->iosig.io.pending)
252			revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
253			}
254	root	1.1
255			if (ev->to.pending)
256			{
257			revents \|= EV_TIMEOUT;
258
259			if (tv)
260			tv_set (tv, ev_now); /* not sure if this is right :) */
261			}
262
263			return events & revents;
264			}
265
266			int event_priority_init (int npri)
267			{
268			return event_base_priority_init (x_cur, npri);
269			}
270
271			int event_priority_set (struct event *ev, int pri)
272			{
273			ev->ev_pri = pri;
274
275			return 0;
276			}
277
278			int event_base_set (struct event_base base, struct event ev)
279			{
280			ev->ev_base = base;
281
282			return 0;
283			}
284
285			int event_base_loop (struct event_base *base, int flags)
286			{
287			do
288			{
289			ev_loop (flags \| EVLOOP_ONESHOT);
290			}
291			while (!(flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK)) && x_actives && !ev_loop_done);
292
293			return 0;
294			}
295
296			int event_base_dispatch (struct event_base *base)
297			{
298			return event_base_loop (base, 0);
299			}
300
301			static void
302			x_loopexit_cb (int revents, void *arg)
303			{
304			ev_loop_done = 2;
305			}
306
307			int event_base_loopexit (struct event_base base, struct timeval tv)
308			{
309			ev_tstamp after = tv_get (tv);
310
311			ev_once (-1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
312			}
313
314			struct x_once
315			{
316			int fd;
317			void (cb)(int, short, void );
318			void *arg;
319			};
320
321			static void
322			x_once_cb (int revents, void *arg)
323			{
324			struct x_once *once = arg;
325
326			once->cb (once->fd, revents, once->arg);
327			free (once);
328			}
329
330			int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
331			{
332			struct x_once *once = malloc (sizeof (struct x_once));
333
334			if (!once)
335			return -1;
336
337			once->fd = fd;
338			once->cb = cb;
339			once->arg = arg;
340
341	root	1.2	ev_once (fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
342	root	1.1
343			return 0;
344			}
345
346			int event_base_priority_init (struct event_base *base, int npri)
347			{
348			return 0;
349			}
350