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 <assert.h>

#include "ev.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_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
  if (x_cur)
    x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
  else
    x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
#else
  assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));

  x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
#endif

  return x_cur;
}

void event_base_free (struct event_base *base)
{
  dLOOPbase;

#if EV_MULTIPLICITY
  if (ev_default_loop (EVMETHOD_AUTO) != loop)
    ev_loop_destroy (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)
{
  struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, to));

  event_del (ev);

  x_cb (ev, revents);
}

void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg)
{
  printf ("event set %p\n", ev);//D
  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)
{
  printf ("event add %p %p\n", ev, &ev->to);//D
  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)
{
  printf ("event del %p\n", ev);//D
  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);
    }

  printf ("to %p %d\n", &ev->to, ev->to.active);//D
  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_is_active (&ev->iosig.sig) || ev_is_pending (&ev->iosig.sig))
        revents |= EV_SIGNAL;
    }
  else
    {
      /* io */
      if (ev_is_active (&ev->iosig.io) || ev_is_pending (&ev->iosig.io))
        revents |= ev->ev_events & (EV_READ | EV_WRITE);
    }

  if (ev->ev_events & EV_TIMEOUT || ev_is_active (&ev->to) || ev_is_pending (&ev->to))
    {
      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:	1.15
Committed:	Sun Nov 4 20:38:07 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.14:	+4 -0 lines
Log Message:	need to rethinkg design, maybe use 'proper' struct subclassing due to aliasing restrictions in C
#	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	root	1.10	#include <assert.h>
36	root	1.1
37	root	1.12	#include "ev.h"
38			#include "event.h"
39	root	1.1
40	root	1.9	#if EV_MULTIPLICITY
41			# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
42			# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
43	root	1.8	#else
44			# define dLOOPev
45			# define dLOOPbase
46			#endif
47	root	1.7
48	root	1.9	/* never accessed, will always be cast from/to ev_loop */
49	root	1.1	struct event_base
50			{
51			int dummy;
52			};
53
54	root	1.10	static struct event_base *x_cur;
55	root	1.1
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	1.9	#if EV_MULTIPLICITY
87	root	1.10	if (x_cur)
88			x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
89			else
90	root	1.13	x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
91	root	1.9	#else
92	root	1.10	assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));
93
94			x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
95	root	1.9	#endif
96	root	1.1
97	root	1.9	return x_cur;
98	root	1.1	}
99
100			void event_base_free (struct event_base *base)
101			{
102	root	1.8	dLOOPbase;
103
104	root	1.9	#if EV_MULTIPLICITY
105	root	1.13	if (ev_default_loop (EVMETHOD_AUTO) != loop)
106			ev_loop_destroy (loop);
107	root	1.9	#endif
108	root	1.1	}
109
110			int event_dispatch (void)
111			{
112			return event_base_dispatch (x_cur);
113			}
114
115	root	1.12	#ifdef EV_STANDALONE
116	root	1.1	void event_set_log_callback (event_log_cb cb)
117			{
118			/* nop */
119			}
120	root	1.5	#endif
121	root	1.1
122			int event_loop (int flags)
123			{
124			return event_base_loop (x_cur, flags);
125			}
126
127			int event_loopexit (struct timeval *tv)
128			{
129	root	1.5	return event_base_loopexit (x_cur, tv);
130	root	1.1	}
131
132			static void
133			x_cb (struct event *ev, int revents)
134			{
135			revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
136
137			ev->ev_res = revents;
138			ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
139			}
140
141			static void
142	root	1.7	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
143	root	1.1	{
144	root	1.7	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
145	root	1.1	}
146
147			static void
148	root	1.7	x_cb_io (EV_P_ struct ev_io *w, int revents)
149	root	1.1	{
150	root	1.7	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
151
152			if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
153	root	1.9	ev_io_stop (EV_A_ w);
154	root	1.7
155			x_cb (ev, revents);
156	root	1.1	}
157
158			static void
159	root	1.7	x_cb_to (EV_P_ struct ev_timer *w, int revents)
160	root	1.1	{
161	root	1.14	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
162
163			event_del (ev);
164
165			x_cb (ev, revents);
166	root	1.1	}
167
168			void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
169			{
170	root	1.15	printf ("event set %p\n", ev);//D
171	root	1.14	if (events & EV_SIGNAL)
172			ev_watcher_init (&ev->iosig.sig, x_cb_sig);
173			else
174			ev_watcher_init (&ev->iosig.io, x_cb_io);
175	root	1.4
176	root	1.14	ev_watcher_init (&ev->to, x_cb_to);
177	root	1.1
178	root	1.9	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
179	root	1.1	ev->ev_fd = fd;
180			ev->ev_events = events;
181			ev->ev_pri = 0;
182			ev->ev_callback = cb;
183			ev->ev_arg = arg;
184			ev->ev_res = 0;
185			}
186
187			int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
188			{
189	root	1.5	return event_base_once (x_cur, fd, events, cb, arg, tv);
190	root	1.1	}
191
192			int event_add (struct event ev, struct timeval tv)
193			{
194	root	1.15	printf ("event add %p %p\n", ev, &ev->to);//D
195	root	1.7	dLOOPev;
196
197	root	1.4	/* disable all watchers */
198			event_del (ev);
199
200			if (ev->ev_events & EV_SIGNAL)
201	root	1.1	{
202	root	1.4	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
203	root	1.7	ev_signal_start (EV_A_ &ev->iosig.sig);
204	root	1.1	}
205	root	1.4	else if (ev->ev_events & (EV_READ \| EV_WRITE))
206	root	1.1	{
207	root	1.4	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
208	root	1.7	ev_io_start (EV_A_ &ev->iosig.io);
209	root	1.1	}
210
211	root	1.4	if (tv)
212	root	1.1	{
213	root	1.4	ev_timer_set (&ev->to, tv_get (tv), 0.);
214	root	1.7	ev_timer_start (EV_A_ &ev->to);
215	root	1.1	}
216
217			return 0;
218			}
219
220			int event_del (struct event *ev)
221			{
222	root	1.15	printf ("event del %p\n", ev);//D
223	root	1.7	dLOOPev;
224
225	root	1.4	if (ev->ev_events & EV_SIGNAL)
226			{
227			/* sig */
228			if (ev_is_active (&ev->iosig.sig))
229	root	1.7	ev_signal_stop (EV_A_ &ev->iosig.sig);
230	root	1.4	}
231			else
232	root	1.1	{
233	root	1.4	/* io */
234			if (ev_is_active (&ev->iosig.io))
235	root	1.7	ev_io_stop (EV_A_ &ev->iosig.io);
236	root	1.1	}
237
238	root	1.15	printf ("to %p %d\n", &ev->to, ev->to.active);//D
239	root	1.1	if (ev_is_active (&ev->to))
240	root	1.7	ev_timer_stop (EV_A_ &ev->to);
241	root	1.1
242			return 0;
243			}
244
245			int event_pending (struct event ev, short events, struct timeval tv)
246			{
247	root	1.7	dLOOPev;
248
249	root	1.5	short revents = 0;
250	root	1.1
251	root	1.4	if (ev->ev_events & EV_SIGNAL)
252			{
253			/* sig */
254	root	1.14	if (ev_is_active (&ev->iosig.sig) \|\| ev_is_pending (&ev->iosig.sig))
255	root	1.4	revents \|= EV_SIGNAL;
256			}
257			else
258			{
259			/* io */
260	root	1.14	if (ev_is_active (&ev->iosig.io) \|\| ev_is_pending (&ev->iosig.io))
261	root	1.4	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
262			}
263	root	1.1
264	root	1.14	if (ev->ev_events & EV_TIMEOUT \|\| ev_is_active (&ev->to) \|\| ev_is_pending (&ev->to))
265	root	1.1	{
266			revents \|= EV_TIMEOUT;
267
268			if (tv)
269	root	1.7	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
270	root	1.1	}
271
272			return events & revents;
273			}
274
275			int event_priority_init (int npri)
276			{
277			return event_base_priority_init (x_cur, npri);
278			}
279
280			int event_priority_set (struct event *ev, int pri)
281			{
282			ev->ev_pri = pri;
283
284			return 0;
285			}
286
287			int event_base_set (struct event_base base, struct event ev)
288			{
289			ev->ev_base = base;
290
291			return 0;
292			}
293
294			int event_base_loop (struct event_base *base, int flags)
295			{
296	root	1.7	dLOOPbase;
297	root	1.8
298			ev_loop (EV_A_ flags);
299	root	1.1
300			return 0;
301			}
302
303			int event_base_dispatch (struct event_base *base)
304			{
305			return event_base_loop (base, 0);
306			}
307
308			static void
309	root	1.9	x_loopexit_cb (int revents, void *base)
310	root	1.1	{
311	root	1.9	dLOOPbase;
312
313			ev_unloop (EV_A_ EVUNLOOP_ONCE);
314	root	1.1	}
315
316			int event_base_loopexit (struct event_base base, struct timeval tv)
317			{
318	root	1.7	dLOOPbase;
319	root	1.1	ev_tstamp after = tv_get (tv);
320
321	root	1.7	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
322	root	1.5
323			return -1;
324	root	1.1	}
325
326			struct x_once
327			{
328			int fd;
329			void (cb)(int, short, void );
330			void *arg;
331			};
332
333			static void
334			x_once_cb (int revents, void *arg)
335			{
336			struct x_once *once = arg;
337
338			once->cb (once->fd, revents, once->arg);
339			free (once);
340			}
341
342			int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
343			{
344	root	1.7	dLOOPbase;
345	root	1.1	struct x_once *once = malloc (sizeof (struct x_once));
346
347			if (!once)
348			return -1;
349
350			once->fd = fd;
351			once->cb = cb;
352			once->arg = arg;
353
354	root	1.7	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
355	root	1.1
356			return 0;
357			}
358
359			int event_base_priority_init (struct event_base *base, int npri)
360			{
361	root	1.13	/dLOOPbase;/
362	root	1.7
363	root	1.1	return 0;
364			}
365