libev/ev_kqueue.c

/*
 * libev kqueue backend
 *
 * 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 <sys/types.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <sys/event.h>
#include <string.h>
#include <errno.h>

void inline_speed
kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
{
  struct kevent *ke;

  ++kqueue_changecnt;
  array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);

  EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);
}

#ifndef NOTE_EOF
# define NOTE_EOF 0
#endif

static void
kqueue_modify (EV_P_ int fd, int oev, int nev)
{
  if (oev != nev)
    {
      if (oev & EV_READ)
        kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0);

      if (oev & EV_WRITE)
        kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
    }

  /* to detect close/reopen reliably, we have to re-add */
  /* event requests even when oev == nev */

  if (nev & EV_READ)
    kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD, NOTE_EOF);

  if (nev & EV_WRITE)
    kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
}

static void
kqueue_poll (EV_P_ ev_tstamp timeout)
{
  int res, i;
  struct timespec ts;

  /* need to resize so there is enough space for errors */
  if (kqueue_changecnt > kqueue_eventmax)
    {
      ev_free (kqueue_events);
      kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt);
      kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
    }

  ts.tv_sec  = (time_t)timeout;
  ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9);
  res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
  kqueue_changecnt = 0;

  if (expect_false (res < 0))
    { 
      if (errno != EINTR)
        syserr ("(libev) kevent");

      return;
    } 

  for (i = 0; i < res; ++i)
    {
      int fd = kqueue_events [i].ident;

      if (expect_false (kqueue_events [i].flags & EV_ERROR))
        {
          int err = kqueue_events [i].data;

          /* we are only interested in errors for fds that we are interested in :) */
          if (anfds [fd].events)
            {
              if (err == ENOENT) /* resubmit changes on ENOENT */
                kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
              else if (err == EBADF) /* on EBADF, we re-check the fd */
                {
                  if (fd_valid (fd))
                    kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
                  else
                    fd_kill (EV_A_ fd);
                }
              else /* on all other errors, we error out on the fd */
                fd_kill (EV_A_ fd);
            }
        }
      else
        fd_event (
          EV_A_
          fd,
          kqueue_events [i].filter == EVFILT_READ ? EV_READ
          : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE
          : 0
        );
    }

  if (expect_false (res == kqueue_eventmax))
    {
      ev_free (kqueue_events);
      kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1);
      kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
    }
}

int inline_size
kqueue_init (EV_P_ int flags)
{
  struct kevent ch, ev;

  /* Initalize the kernel queue */
  if ((backend_fd = kqueue ()) < 0)
    return 0;

  fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */

  backend_fudge  = 1e-3; /* needed to compensate for kevent returning early */
  backend_modify = kqueue_modify;
  backend_poll   = kqueue_poll;

  kqueue_eventmax = 64; /* initial number of events receivable per poll */
  kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);

  kqueue_changes   = 0;
  kqueue_changemax = 0;
  kqueue_changecnt = 0;

  return EVBACKEND_KQUEUE;
}

void inline_size
kqueue_destroy (EV_P)
{
  ev_free (kqueue_events);
  ev_free (kqueue_changes);
}

void inline_size
kqueue_fork (EV_P)
{
  close (backend_fd);

  while ((backend_fd = kqueue ()) < 0)
    syserr ("(libev) kqueue");

  fcntl (backend_fd, F_SETFD, FD_CLOEXEC);

  /* re-register interest in fds */
  fd_rearm_all (EV_A);
}

Revision:	1.30
Committed:	Sun Dec 9 03:51:19 2007 UTC (16 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.29:	+0 -1 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* libev kqueue backend
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 <sys/types.h>
33	#include <sys/time.h>
34	#include <sys/queue.h>
35	#include <sys/event.h>
36	#include <string.h>
37	#include <errno.h>
38
39	void inline_speed
40	kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
41	{
42	struct kevent *ke;
43
44	++kqueue_changecnt;
45	array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
46
47	EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);
48	}
49
50	#ifndef NOTE_EOF
51	# define NOTE_EOF 0
52	#endif
53
54	static void
55	kqueue_modify (EV_P_ int fd, int oev, int nev)
56	{
57	if (oev != nev)
58	{
59	if (oev & EV_READ)
60	kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0);
61
62	if (oev & EV_WRITE)
63	kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
64	}
65
66	/* to detect close/reopen reliably, we have to re-add */
67	/* event requests even when oev == nev */
68
69	if (nev & EV_READ)
70	kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD, NOTE_EOF);
71
72	if (nev & EV_WRITE)
73	kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
74	}
75
76	static void
77	kqueue_poll (EV_P_ ev_tstamp timeout)
78	{
79	int res, i;
80	struct timespec ts;
81
82	/* need to resize so there is enough space for errors */
83	if (kqueue_changecnt > kqueue_eventmax)
84	{
85	ev_free (kqueue_events);
86	kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt);
87	kqueue_events = (struct kevent )ev_malloc (sizeof (struct kevent) kqueue_eventmax);
88	}
89
90	ts.tv_sec = (time_t)timeout;
91	ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9);
92	res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
93	kqueue_changecnt = 0;
94
95	if (expect_false (res < 0))
96	{
97	if (errno != EINTR)
98	syserr ("(libev) kevent");
99
100	return;
101	}
102
103	for (i = 0; i < res; ++i)
104	{
105	int fd = kqueue_events [i].ident;
106
107	if (expect_false (kqueue_events [i].flags & EV_ERROR))
108	{
109	int err = kqueue_events [i].data;
110
111	/* we are only interested in errors for fds that we are interested in :) */
112	if (anfds [fd].events)
113	{
114	if (err == ENOENT) /* resubmit changes on ENOENT */
115	kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
116	else if (err == EBADF) /* on EBADF, we re-check the fd */
117	{
118	if (fd_valid (fd))
119	kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
120	else
121	fd_kill (EV_A_ fd);
122	}
123	else /* on all other errors, we error out on the fd */
124	fd_kill (EV_A_ fd);
125	}
126	}
127	else
128	fd_event (
129	EV_A_
130	fd,
131	kqueue_events [i].filter == EVFILT_READ ? EV_READ
132	: kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE
133	: 0
134	);
135	}
136
137	if (expect_false (res == kqueue_eventmax))
138	{
139	ev_free (kqueue_events);
140	kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1);
141	kqueue_events = (struct kevent )ev_malloc (sizeof (struct kevent) kqueue_eventmax);
142	}
143	}
144
145	int inline_size
146	kqueue_init (EV_P_ int flags)
147	{
148	struct kevent ch, ev;
149
150	/* Initalize the kernel queue */
151	if ((backend_fd = kqueue ()) < 0)
152	return 0;
153
154	fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
155
156	backend_fudge = 1e-3; /* needed to compensate for kevent returning early */
157	backend_modify = kqueue_modify;
158	backend_poll = kqueue_poll;
159
160	kqueue_eventmax = 64; /* initial number of events receivable per poll */
161	kqueue_events = (struct kevent )ev_malloc (sizeof (struct kevent) kqueue_eventmax);
162
163	kqueue_changes = 0;
164	kqueue_changemax = 0;
165	kqueue_changecnt = 0;
166
167	return EVBACKEND_KQUEUE;
168	}
169
170	void inline_size
171	kqueue_destroy (EV_P)
172	{
173	ev_free (kqueue_events);
174	ev_free (kqueue_changes);
175	}
176
177	void inline_size
178	kqueue_fork (EV_P)
179	{
180	close (backend_fd);
181
182	while ((backend_fd = kqueue ()) < 0)
183	syserr ("(libev) kqueue");
184
185	fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
186
187	/* re-register interest in fds */
188	fd_rearm_all (EV_A);
189	}
190