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 <assert.h>

#ifndef WIN32
# include <sys/time.h>
#endif

#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 *)(long)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)
{
  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 if (ev->ev_events & (EV_READ | EV_WRITE))
    {
      /* 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)
{
  short revents = 0;
  dLOOPev;


  if (ev->ev_events & EV_SIGNAL)
    {
      /* sig */
      if (ev_is_active (&ev->iosig.sig) || ev_is_pending (&ev->iosig.sig))
        revents |= EV_SIGNAL;
    }
  else if (ev->ev_events & (EV_READ | EV_WRITE))
    {
      /* 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)
{
  ev_tstamp after = tv_get (tv);
  dLOOPbase;

  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)
{
  struct x_once *once = malloc (sizeof (struct x_once));
  dLOOPbase;

  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:	1.18
Committed:	Tue Nov 6 13:17:55 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-0_5
Changes since 1.17:	+7 -4 lines
Log Message:	now port to microsofts goddamn broken pseudo-c-we-do-it-different-to-spite-you so-called c compiler
#	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	root	1.10	#include <assert.h>
35	root	1.1
36	root	1.18	#ifndef WIN32
37			# include <sys/time.h>
38			#endif
39
40	root	1.12	#include "ev.h"
41			#include "event.h"
42	root	1.1
43	root	1.9	#if EV_MULTIPLICITY
44			# define dLOOPev struct ev_loop loop = (struct ev_loop )ev->ev_base
45			# define dLOOPbase struct ev_loop loop = (struct ev_loop )base
46	root	1.8	#else
47			# define dLOOPev
48			# define dLOOPbase
49			#endif
50	root	1.7
51	root	1.9	/* never accessed, will always be cast from/to ev_loop */
52	root	1.1	struct event_base
53			{
54			int dummy;
55			};
56
57	root	1.10	static struct event_base *x_cur;
58	root	1.1
59			static void
60			tv_set (struct timeval *tv, ev_tstamp at)
61			{
62			tv->tv_sec = (long)at;
63			tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
64			}
65
66			static ev_tstamp
67			tv_get (struct timeval *tv)
68			{
69			if (tv)
70			return tv->tv_sec + tv->tv_usec * 1e-6;
71			else
72			return -1.;
73			}
74
75			#define EVENT_VERSION(a,b) # a "." # b
76
77			const char *event_get_version (void)
78			{
79			return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
80			}
81
82			const char *event_get_method (void)
83			{
84			return "libev";
85			}
86
87			void *event_init (void)
88			{
89	root	1.9	#if EV_MULTIPLICITY
90	root	1.10	if (x_cur)
91			x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
92			else
93	root	1.13	x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
94	root	1.9	#else
95	root	1.10	assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));
96
97	root	1.17	x_cur = (struct event_base *)(long)ev_default_loop (EVMETHOD_AUTO);
98	root	1.9	#endif
99	root	1.1
100	root	1.9	return x_cur;
101	root	1.1	}
102
103			void event_base_free (struct event_base *base)
104			{
105	root	1.8	dLOOPbase;
106
107	root	1.9	#if EV_MULTIPLICITY
108	root	1.13	if (ev_default_loop (EVMETHOD_AUTO) != loop)
109			ev_loop_destroy (loop);
110	root	1.9	#endif
111	root	1.1	}
112
113			int event_dispatch (void)
114			{
115			return event_base_dispatch (x_cur);
116			}
117
118	root	1.12	#ifdef EV_STANDALONE
119	root	1.1	void event_set_log_callback (event_log_cb cb)
120			{
121			/* nop */
122			}
123	root	1.5	#endif
124	root	1.1
125			int event_loop (int flags)
126			{
127			return event_base_loop (x_cur, flags);
128			}
129
130			int event_loopexit (struct timeval *tv)
131			{
132	root	1.5	return event_base_loopexit (x_cur, tv);
133	root	1.1	}
134
135			static void
136			x_cb (struct event *ev, int revents)
137			{
138			revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
139
140			ev->ev_res = revents;
141			ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
142			}
143
144			static void
145	root	1.7	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
146	root	1.1	{
147	root	1.7	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
148	root	1.1	}
149
150			static void
151	root	1.7	x_cb_io (EV_P_ struct ev_io *w, int revents)
152	root	1.1	{
153	root	1.7	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
154
155			if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
156	root	1.9	ev_io_stop (EV_A_ w);
157	root	1.7
158			x_cb (ev, revents);
159	root	1.1	}
160
161			static void
162	root	1.7	x_cb_to (EV_P_ struct ev_timer *w, int revents)
163	root	1.1	{
164	root	1.14	struct event ev = (struct event )(((char *)w) - offsetof (struct event, to));
165
166			event_del (ev);
167
168			x_cb (ev, revents);
169	root	1.1	}
170
171			void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
172			{
173	root	1.14	if (events & EV_SIGNAL)
174			ev_watcher_init (&ev->iosig.sig, x_cb_sig);
175			else
176			ev_watcher_init (&ev->iosig.io, x_cb_io);
177	root	1.4
178	root	1.14	ev_watcher_init (&ev->to, x_cb_to);
179	root	1.1
180	root	1.9	ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
181	root	1.1	ev->ev_fd = fd;
182			ev->ev_events = events;
183			ev->ev_pri = 0;
184			ev->ev_callback = cb;
185			ev->ev_arg = arg;
186			ev->ev_res = 0;
187			}
188
189			int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
190			{
191	root	1.5	return event_base_once (x_cur, fd, events, cb, arg, tv);
192	root	1.1	}
193
194			int event_add (struct event ev, struct timeval tv)
195			{
196	root	1.7	dLOOPev;
197
198	root	1.4	/* disable all watchers */
199			event_del (ev);
200
201			if (ev->ev_events & EV_SIGNAL)
202	root	1.1	{
203	root	1.4	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
204	root	1.7	ev_signal_start (EV_A_ &ev->iosig.sig);
205	root	1.1	}
206	root	1.4	else if (ev->ev_events & (EV_READ \| EV_WRITE))
207	root	1.1	{
208	root	1.4	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
209	root	1.7	ev_io_start (EV_A_ &ev->iosig.io);
210	root	1.1	}
211
212	root	1.4	if (tv)
213	root	1.1	{
214	root	1.4	ev_timer_set (&ev->to, tv_get (tv), 0.);
215	root	1.7	ev_timer_start (EV_A_ &ev->to);
216	root	1.1	}
217
218			return 0;
219			}
220
221			int event_del (struct event *ev)
222			{
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	root	1.16	else if (ev->ev_events & (EV_READ \| EV_WRITE))
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			if (ev_is_active (&ev->to))
239	root	1.7	ev_timer_stop (EV_A_ &ev->to);
240	root	1.1
241			return 0;
242			}
243
244			int event_pending (struct event ev, short events, struct timeval tv)
245			{
246	root	1.18	short revents = 0;
247	root	1.7	dLOOPev;
248
249	root	1.1
250	root	1.4	if (ev->ev_events & EV_SIGNAL)
251			{
252			/* sig */
253	root	1.14	if (ev_is_active (&ev->iosig.sig) \|\| ev_is_pending (&ev->iosig.sig))
254	root	1.4	revents \|= EV_SIGNAL;
255			}
256	root	1.16	else if (ev->ev_events & (EV_READ \| EV_WRITE))
257	root	1.4	{
258			/* io */
259	root	1.14	if (ev_is_active (&ev->iosig.io) \|\| ev_is_pending (&ev->iosig.io))
260	root	1.4	revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
261			}
262	root	1.1
263	root	1.14	if (ev->ev_events & EV_TIMEOUT \|\| ev_is_active (&ev->to) \|\| ev_is_pending (&ev->to))
264	root	1.1	{
265			revents \|= EV_TIMEOUT;
266
267			if (tv)
268	root	1.7	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
269	root	1.1	}
270
271			return events & revents;
272			}
273
274			int event_priority_init (int npri)
275			{
276			return event_base_priority_init (x_cur, npri);
277			}
278
279			int event_priority_set (struct event *ev, int pri)
280			{
281			ev->ev_pri = pri;
282
283			return 0;
284			}
285
286			int event_base_set (struct event_base base, struct event ev)
287			{
288			ev->ev_base = base;
289
290			return 0;
291			}
292
293			int event_base_loop (struct event_base *base, int flags)
294			{
295	root	1.7	dLOOPbase;
296	root	1.8
297			ev_loop (EV_A_ flags);
298	root	1.1
299			return 0;
300			}
301
302			int event_base_dispatch (struct event_base *base)
303			{
304			return event_base_loop (base, 0);
305			}
306
307			static void
308	root	1.9	x_loopexit_cb (int revents, void *base)
309	root	1.1	{
310	root	1.9	dLOOPbase;
311
312			ev_unloop (EV_A_ EVUNLOOP_ONCE);
313	root	1.1	}
314
315			int event_base_loopexit (struct event_base base, struct timeval tv)
316			{
317	root	1.18	ev_tstamp after = tv_get (tv);
318	root	1.7	dLOOPbase;
319	root	1.1
320	root	1.7	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
321	root	1.5
322			return -1;
323	root	1.1	}
324
325			struct x_once
326			{
327			int fd;
328			void (cb)(int, short, void );
329			void *arg;
330			};
331
332			static void
333			x_once_cb (int revents, void *arg)
334			{
335			struct x_once *once = arg;
336
337			once->cb (once->fd, revents, once->arg);
338			free (once);
339			}
340
341			int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
342			{
343	root	1.18	struct x_once *once = malloc (sizeof (struct x_once));
344	root	1.7	dLOOPbase;
345	root	1.1
346			if (!once)
347			return -1;
348
349			once->fd = fd;
350			once->cb = cb;
351			once->arg = arg;
352
353	root	1.7	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
354	root	1.1
355			return 0;
356			}
357
358			int event_base_priority_init (struct event_base *base, int npri)
359			{
360	root	1.13	/dLOOPbase;/
361	root	1.7
362	root	1.1	return 0;
363			}
364