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"

#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_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
  x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
#else
  x_cur = &x_base;
#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:	1.9
Committed:	Sun Nov 4 00:24:17 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+29 -19 lines
Log Message:	wow the event api is broken
#	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	1.9	#if EV_MULTIPLICITY
39			# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
40			# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
41	root	1.8	#else
42			# define dLOOPev
43			# define dLOOPbase
44			#endif
45	root	1.7
46	root	1.9	/* never accessed, will always be cast from/to ev_loop */
47	root	1.1	struct event_base
48			{
49			int dummy;
50			};
51
52			static struct event_base x_base, *x_cur;
53
54			static void
55			tv_set (struct timeval *tv, ev_tstamp at)
56			{
57			tv->tv_sec = (long)at;
58			tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
59			}
60
61			static ev_tstamp
62			tv_get (struct timeval *tv)
63			{
64			if (tv)
65			return tv->tv_sec + tv->tv_usec * 1e-6;
66			else
67			return -1.;
68			}
69
70			#define EVENT_VERSION(a,b) # a "." # b
71
72			const char *event_get_version (void)
73			{
74			return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
75			}
76
77			const char *event_get_method (void)
78			{
79			return "libev";
80			}
81
82			void *event_init (void)
83			{
84	root	1.9	#if EV_MULTIPLICITY
85			x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
86			#else
87			x_cur = &x_base;
88			#endif
89	root	1.1
90	root	1.9	return x_cur;
91	root	1.1	}
92
93			void event_base_free (struct event_base *base)
94			{
95	root	1.8	dLOOPbase;
96
97	root	1.9	#if EV_MULTIPLICITY
98			ev_loop_delete (loop);
99			#endif
100	root	1.1	}
101
102			int event_dispatch (void)
103			{
104			return event_base_dispatch (x_cur);
105			}
106
107	root	1.5	#ifdef EV_STANDALONE
108	root	1.1	void event_set_log_callback (event_log_cb cb)
109			{
110			/* nop */
111			}
112	root	1.5	#endif
113	root	1.1
114			int event_loop (int flags)
115			{
116			return event_base_loop (x_cur, flags);
117			}
118
119			int event_loopexit (struct timeval *tv)
120			{
121	root	1.5	return event_base_loopexit (x_cur, tv);
122	root	1.1	}
123
124			static void
125			x_cb (struct event *ev, int revents)
126			{
127			revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
128
129			ev->ev_res = revents;
130			ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
131			}
132
133			static void
134	root	1.7	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
135	root	1.1	{
136	root	1.7	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
137	root	1.1	}
138
139			static void
140	root	1.7	x_cb_io (EV_P_ struct ev_io *w, int revents)
141	root	1.1	{
142	root	1.7	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
143
144			if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
145	root	1.9	ev_io_stop (EV_A_ w);
146	root	1.7
147			x_cb (ev, revents);
148	root	1.1	}
149
150			static void
151	root	1.7	x_cb_to (EV_P_ struct ev_timer *w, int revents)
152	root	1.1	{
153	root	1.7	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
154	root	1.1	}
155
156			void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
157			{
158	root	1.9	if (!ev->initialised)
159			{
160			ev->initialised = 1;
161
162			if (events & EV_SIGNAL)
163			ev_watcher_init (&ev->iosig.sig, x_cb_sig);
164			else
165			ev_watcher_init (&ev->iosig.io, x_cb_io);
166	root	1.4
167	root	1.9	ev_watcher_init (&ev->to, x_cb_to);
168			}
169	root	1.1
170	root	1.9	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
171	root	1.1	ev->ev_fd = fd;
172			ev->ev_events = events;
173			ev->ev_pri = 0;
174			ev->ev_callback = cb;
175			ev->ev_arg = arg;
176			ev->ev_res = 0;
177			}
178
179			int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
180			{
181	root	1.5	return event_base_once (x_cur, fd, events, cb, arg, tv);
182	root	1.1	}
183
184			int event_add (struct event ev, struct timeval tv)
185			{
186	root	1.7	dLOOPev;
187
188	root	1.4	/* disable all watchers */
189			event_del (ev);
190
191			if (ev->ev_events & EV_SIGNAL)
192	root	1.1	{
193	root	1.4	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
194	root	1.7	ev_signal_start (EV_A_ &ev->iosig.sig);
195	root	1.1	}
196	root	1.4	else if (ev->ev_events & (EV_READ \| EV_WRITE))
197	root	1.1	{
198	root	1.4	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
199	root	1.7	ev_io_start (EV_A_ &ev->iosig.io);
200	root	1.1	}
201
202	root	1.4	if (tv)
203	root	1.1	{
204	root	1.4	ev_timer_set (&ev->to, tv_get (tv), 0.);
205	root	1.7	ev_timer_start (EV_A_ &ev->to);
206	root	1.1	}
207
208			return 0;
209			}
210
211			int event_del (struct event *ev)
212			{
213	root	1.7	dLOOPev;
214
215	root	1.4	if (ev->ev_events & EV_SIGNAL)
216			{
217			/* sig */
218			if (ev_is_active (&ev->iosig.sig))
219	root	1.7	ev_signal_stop (EV_A_ &ev->iosig.sig);
220	root	1.4	}
221			else
222	root	1.1	{
223	root	1.4	/* io */
224			if (ev_is_active (&ev->iosig.io))
225	root	1.7	ev_io_stop (EV_A_ &ev->iosig.io);
226	root	1.1	}
227
228			if (ev_is_active (&ev->to))
229	root	1.7	ev_timer_stop (EV_A_ &ev->to);
230	root	1.1
231			return 0;
232			}
233
234			int event_pending (struct event ev, short events, struct timeval tv)
235			{
236	root	1.7	dLOOPev;
237
238	root	1.5	short revents = 0;
239	root	1.1
240	root	1.4	if (ev->ev_events & EV_SIGNAL)
241			{
242			/* sig */
243			if (ev->iosig.sig.pending)
244			revents \|= EV_SIGNAL;
245			}
246			else
247			{
248			/* io */
249			if (ev->iosig.io.pending)
250			revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
251			}
252	root	1.1
253			if (ev->to.pending)
254			{
255			revents \|= EV_TIMEOUT;
256
257			if (tv)
258	root	1.7	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
259	root	1.1	}
260
261			return events & revents;
262			}
263
264			int event_priority_init (int npri)
265			{
266			return event_base_priority_init (x_cur, npri);
267			}
268
269			int event_priority_set (struct event *ev, int pri)
270			{
271			ev->ev_pri = pri;
272
273			return 0;
274			}
275
276			int event_base_set (struct event_base base, struct event ev)
277			{
278			ev->ev_base = base;
279
280			return 0;
281			}
282
283			int event_base_loop (struct event_base *base, int flags)
284			{
285	root	1.7	dLOOPbase;
286	root	1.8
287			ev_loop (EV_A_ flags);
288	root	1.1
289			return 0;
290			}
291
292			int event_base_dispatch (struct event_base *base)
293			{
294			return event_base_loop (base, 0);
295			}
296
297			static void
298	root	1.9	x_loopexit_cb (int revents, void *base)
299	root	1.1	{
300	root	1.9	dLOOPbase;
301
302			ev_unloop (EV_A_ EVUNLOOP_ONCE);
303	root	1.1	}
304
305			int event_base_loopexit (struct event_base base, struct timeval tv)
306			{
307	root	1.7	dLOOPbase;
308	root	1.1	ev_tstamp after = tv_get (tv);
309
310	root	1.7	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
311	root	1.5
312			return -1;
313	root	1.1	}
314
315			struct x_once
316			{
317			int fd;
318			void (cb)(int, short, void );
319			void *arg;
320			};
321
322			static void
323			x_once_cb (int revents, void *arg)
324			{
325			struct x_once *once = arg;
326
327			once->cb (once->fd, revents, once->arg);
328			free (once);
329			}
330
331			int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
332			{
333	root	1.7	dLOOPbase;
334	root	1.1	struct x_once *once = malloc (sizeof (struct x_once));
335
336			if (!once)
337			return -1;
338
339			once->fd = fd;
340			once->cb = cb;
341			once->arg = arg;
342
343	root	1.7	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
344	root	1.1
345			return 0;
346			}
347
348			int event_base_priority_init (struct event_base *base, int npri)
349			{
350	root	1.7	dLOOPbase;
351
352	root	1.1	return 0;
353			}
354