libev/ev_poll.c

/*
 * libev epoll fd activity 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 <poll.h>

static void
pollidx_init (int *base, int count)
{
  while (count--)
    *base++ = -1;
}

static void
poll_modify (EV_P_ int fd, int oev, int nev)
{
  int idx;

  if (oev == nev)
    return;

  array_needsize (pollidxs, pollidxmax, fd + 1, pollidx_init);

  idx = pollidxs [fd];

  if (idx < 0) /* need to allocate a new pollfd */
    {
      idx = pollcnt++;
      array_needsize (polls, pollmax, pollcnt, );
      polls [idx].fd = fd;
    }

  if (nev)
    polls [idx].events =
        (nev & EV_READ ? POLLIN : 0)
        | (nev & EV_WRITE ? POLLOUT : 0);
  else /* remove pollfd */
    {
      if (idx < pollcnt--)
        {
          pollidxs [fd] = -1;
          polls [idx] = polls [pollcnt];
          pollidxs [polls [idx].fd] = idx;
        }
    }
}

static void
poll_poll (EV_P_ ev_tstamp timeout)
{
  int i;
  int res = poll (polls, pollcnt, ceil (timeout * 1000.));

  if (res < 0)
    {
      if (errno == EBADF)
        fd_ebadf (EV_A);
      else if (errno == ENOMEM && !syserr_cb)
        fd_enomem (EV_A);
      else if (errno != EINTR)
        syserr ("(libev) poll");

      return;
    }

  for (i = 0; i < pollcnt; ++i)
    fd_event (
      EV_A_
      polls [i].fd,
      (polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
      | (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
    );
}

static int
poll_init (EV_P_ int flags)
{
  method_fudge  = 1e-3; /* needed to compensate for select returning early, very conservative */
  method_modify = poll_modify;
  method_poll   = poll_poll;

  pollidxs = 0; pollidxmax = 0;
  polls    = 0; pollmax    = 0; pollcnt = 0;

  return EVMETHOD_POLL;
}

static void
poll_destroy (EV_P)
{
  ev_free (pollidxs);
  ev_free (polls);
}
Revision:	1.8
Committed:	Tue Nov 6 00:52:33 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-0_5
Changes since 1.7:	+1 -1 lines
Log Message:	better fork
#	Content
1	/*
2	* libev epoll fd activity 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 <poll.h>
33
34	static void
35	pollidx_init (int *base, int count)
36	{
37	while (count--)
38	*base++ = -1;
39	}
40
41	static void
42	poll_modify (EV_P_ int fd, int oev, int nev)
43	{
44	int idx;
45
46	if (oev == nev)
47	return;
48
49	array_needsize (pollidxs, pollidxmax, fd + 1, pollidx_init);
50
51	idx = pollidxs [fd];
52
53	if (idx < 0) /* need to allocate a new pollfd */
54	{
55	idx = pollcnt++;
56	array_needsize (polls, pollmax, pollcnt, );
57	polls [idx].fd = fd;
58	}
59
60	if (nev)
61	polls [idx].events =
62	(nev & EV_READ ? POLLIN : 0)
63	\| (nev & EV_WRITE ? POLLOUT : 0);
64	else /* remove pollfd */
65	{
66	if (idx < pollcnt--)
67	{
68	pollidxs [fd] = -1;
69	polls [idx] = polls [pollcnt];
70	pollidxs [polls [idx].fd] = idx;
71	}
72	}
73	}
74
75	static void
76	poll_poll (EV_P_ ev_tstamp timeout)
77	{
78	int i;
79	int res = poll (polls, pollcnt, ceil (timeout * 1000.));
80
81	if (res < 0)
82	{
83	if (errno == EBADF)
84	fd_ebadf (EV_A);
85	else if (errno == ENOMEM && !syserr_cb)
86	fd_enomem (EV_A);
87	else if (errno != EINTR)
88	syserr ("(libev) poll");
89
90	return;
91	}
92
93	for (i = 0; i < pollcnt; ++i)
94	fd_event (
95	EV_A_
96	polls [i].fd,
97	(polls [i].revents & (POLLOUT \| POLLERR \| POLLHUP) ? EV_WRITE : 0)
98	\| (polls [i].revents & (POLLIN \| POLLERR \| POLLHUP) ? EV_READ : 0)
99	);
100	}
101
102	static int
103	poll_init (EV_P_ int flags)
104	{
105	method_fudge = 1e-3; /* needed to compensate for select returning early, very conservative */
106	method_modify = poll_modify;
107	method_poll = poll_poll;
108
109	pollidxs = 0; pollidxmax = 0;
110	polls = 0; pollmax = 0; pollcnt = 0;
111
112	return EVMETHOD_POLL;
113	}
114
115	static void
116	poll_destroy (EV_P)
117	{
118	ev_free (pollidxs);
119	ev_free (polls);
120	}