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"

#define dLOOPev
#define dLOOPbase

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 (!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)
{
  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 (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 (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)
{
  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 | EVLOOP_ONESHOT);

  return 0;
}

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

static void
x_loopexit_cb (EV_P_ int revents, void *arg)
{
  ev_unloop (EV_A_ 2);
}

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:	1.7
Committed:	Sat Nov 3 21:58:51 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+37 -58 lines
Log Message:	prepare for multiple bases
#	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	1.7	#define dLOOPev
39			#define dLOOPbase
40
41	root	1.1	struct event_base
42			{
43			int dummy;
44			};
45
46			static struct event_base x_base, *x_cur;
47
48			static void
49			tv_set (struct timeval *tv, ev_tstamp at)
50			{
51			tv->tv_sec = (long)at;
52			tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
53			}
54
55			static ev_tstamp
56			tv_get (struct timeval *tv)
57			{
58			if (tv)
59			return tv->tv_sec + tv->tv_usec * 1e-6;
60			else
61			return -1.;
62			}
63
64			#define EVENT_VERSION(a,b) # a "." # b
65
66			const char *event_get_version (void)
67			{
68			return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
69			}
70
71			const char *event_get_method (void)
72			{
73			return "libev";
74			}
75
76			void *event_init (void)
77			{
78	root	1.6	if (!x_cur && ev_init (0))
79	root	1.1	return x_cur = &x_base;
80
81			return 0;
82			}
83
84			void event_base_free (struct event_base *base)
85			{
86			/* nop */
87			}
88
89			int event_dispatch (void)
90			{
91			return event_base_dispatch (x_cur);
92			}
93
94	root	1.5	#ifdef EV_STANDALONE
95	root	1.1	void event_set_log_callback (event_log_cb cb)
96			{
97			/* nop */
98			}
99	root	1.5	#endif
100	root	1.1
101			int event_loop (int flags)
102			{
103			return event_base_loop (x_cur, flags);
104			}
105
106			int event_loopexit (struct timeval *tv)
107			{
108	root	1.5	return event_base_loopexit (x_cur, tv);
109	root	1.1	}
110
111			static void
112			x_cb (struct event *ev, int revents)
113			{
114			revents &= EV_READ \| EV_WRITE \| EV_TIMEOUT \| EV_SIGNAL;
115
116			ev->ev_res = revents;
117			ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
118			}
119
120			static void
121	root	1.7	x_cb_sig (EV_P_ struct ev_signal *w, int revents)
122	root	1.1	{
123	root	1.7	x_cb ((struct event )(((char )w) - offsetof (struct event, iosig.sig)), revents);
124	root	1.1	}
125
126			static void
127	root	1.7	x_cb_io (EV_P_ struct ev_io *w, int revents)
128	root	1.1	{
129	root	1.7	struct event ev = (struct event )(((char *)w) - offsetof (struct event, iosig.io));
130
131			if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
132			ev_io_stop (w);
133
134			x_cb (ev, revents);
135	root	1.1	}
136
137			static void
138	root	1.7	x_cb_to (EV_P_ struct ev_timer *w, int revents)
139	root	1.1	{
140	root	1.7	x_cb ((struct event )(((char )w) - offsetof (struct event, to)), revents);
141	root	1.1	}
142
143			void event_set (struct event ev, int fd, short events, void (cb)(int, short, void ), void arg)
144			{
145	root	1.4	if (events & EV_SIGNAL)
146			ev_watcher_init (&ev->iosig.sig, x_cb_sig);
147			else
148			ev_watcher_init (&ev->iosig.io, x_cb_io);
149
150	root	1.1	ev_watcher_init (&ev->to, x_cb_to);
151
152			ev->ev_base = x_cur;
153			ev->ev_fd = fd;
154			ev->ev_events = events;
155			ev->ev_pri = 0;
156			ev->ev_callback = cb;
157			ev->ev_arg = arg;
158			ev->ev_res = 0;
159			}
160
161			int event_once (int fd, short events, void (cb)(int, short, void ), void arg, struct timeval tv)
162			{
163	root	1.5	return event_base_once (x_cur, fd, events, cb, arg, tv);
164	root	1.1	}
165
166			int event_add (struct event ev, struct timeval tv)
167			{
168	root	1.7	dLOOPev;
169
170	root	1.4	/* disable all watchers */
171			event_del (ev);
172
173			if (ev->ev_events & EV_SIGNAL)
174	root	1.1	{
175	root	1.4	ev_signal_set (&ev->iosig.sig, ev->ev_fd);
176	root	1.7	ev_signal_start (EV_A_ &ev->iosig.sig);
177	root	1.1	}
178	root	1.4	else if (ev->ev_events & (EV_READ \| EV_WRITE))
179	root	1.1	{
180	root	1.4	ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ \| EV_WRITE));
181	root	1.7	ev_io_start (EV_A_ &ev->iosig.io);
182	root	1.1	}
183
184	root	1.4	if (tv)
185	root	1.1	{
186	root	1.4	ev_timer_set (&ev->to, tv_get (tv), 0.);
187	root	1.7	ev_timer_start (EV_A_ &ev->to);
188	root	1.1	}
189
190			return 0;
191			}
192
193			int event_del (struct event *ev)
194			{
195	root	1.7	dLOOPev;
196
197	root	1.4	if (ev->ev_events & EV_SIGNAL)
198			{
199			/* sig */
200			if (ev_is_active (&ev->iosig.sig))
201	root	1.7	ev_signal_stop (EV_A_ &ev->iosig.sig);
202	root	1.4	}
203			else
204	root	1.1	{
205	root	1.4	/* io */
206			if (ev_is_active (&ev->iosig.io))
207	root	1.7	ev_io_stop (EV_A_ &ev->iosig.io);
208	root	1.1	}
209
210			if (ev_is_active (&ev->to))
211	root	1.7	ev_timer_stop (EV_A_ &ev->to);
212	root	1.1
213			return 0;
214			}
215
216			int event_pending (struct event ev, short events, struct timeval tv)
217			{
218	root	1.7	dLOOPev;
219
220	root	1.5	short revents = 0;
221	root	1.1
222	root	1.4	if (ev->ev_events & EV_SIGNAL)
223			{
224			/* sig */
225			if (ev->iosig.sig.pending)
226			revents \|= EV_SIGNAL;
227			}
228			else
229			{
230			/* io */
231			if (ev->iosig.io.pending)
232			revents \|= ev->ev_events & (EV_READ \| EV_WRITE);
233			}
234	root	1.1
235			if (ev->to.pending)
236			{
237			revents \|= EV_TIMEOUT;
238
239			if (tv)
240	root	1.7	tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
241	root	1.1	}
242
243			return events & revents;
244			}
245
246			int event_priority_init (int npri)
247			{
248			return event_base_priority_init (x_cur, npri);
249			}
250
251			int event_priority_set (struct event *ev, int pri)
252			{
253			ev->ev_pri = pri;
254
255			return 0;
256			}
257
258			int event_base_set (struct event_base base, struct event ev)
259			{
260			ev->ev_base = base;
261
262			return 0;
263			}
264
265			int event_base_loop (struct event_base *base, int flags)
266			{
267	root	1.7	dLOOPbase;
268			ev_loop (EV_A_ flags \| EVLOOP_ONESHOT);
269	root	1.1
270			return 0;
271			}
272
273			int event_base_dispatch (struct event_base *base)
274			{
275			return event_base_loop (base, 0);
276			}
277
278			static void
279	root	1.7	x_loopexit_cb (EV_P_ int revents, void *arg)
280	root	1.1	{
281	root	1.7	ev_unloop (EV_A_ 2);
282	root	1.1	}
283
284			int event_base_loopexit (struct event_base base, struct timeval tv)
285			{
286	root	1.7	dLOOPbase;
287	root	1.1	ev_tstamp after = tv_get (tv);
288
289	root	1.7	ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
290	root	1.5
291			return -1;
292	root	1.1	}
293
294			struct x_once
295			{
296			int fd;
297			void (cb)(int, short, void );
298			void *arg;
299			};
300
301			static void
302			x_once_cb (int revents, void *arg)
303			{
304			struct x_once *once = arg;
305
306			once->cb (once->fd, revents, once->arg);
307			free (once);
308			}
309
310			int event_base_once (struct event_base base, int fd, short events, void (cb)(int, short, void ), void arg, struct timeval *tv)
311			{
312	root	1.7	dLOOPbase;
313	root	1.1	struct x_once *once = malloc (sizeof (struct x_once));
314
315			if (!once)
316			return -1;
317
318			once->fd = fd;
319			once->cb = cb;
320			once->arg = arg;
321
322	root	1.7	ev_once (EV_A_ fd, events & (EV_READ \| EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
323	root	1.1
324			return 0;
325			}
326
327			int event_base_priority_init (struct event_base *base, int npri)
328			{
329	root	1.7	dLOOPbase;
330
331	root	1.1	return 0;
332			}
333