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/cvs/libev/ev_poll.c
Revision: 1.3
Committed: Sat Nov 3 21:58:51 2007 UTC (17 years, 1 month ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.2: +9 -12 lines
Log Message:
prepare for multiple bases

File Contents

# 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 array_needsize (pollidxs, pollidxmax, fd + 1, pollidx_init);
46
47 idx = pollidxs [fd];
48
49 if (idx < 0) /* need to allocate a new pollfd */
50 {
51 idx = pollcnt++;
52 array_needsize (polls, pollmax, pollcnt, );
53 polls [idx].fd = fd;
54 }
55
56 if (nev)
57 polls [idx].events =
58 (nev & EV_READ ? POLLIN : 0)
59 | (nev & EV_WRITE ? POLLOUT : 0);
60 else /* remove pollfd */
61 {
62 if (idx < pollcnt--)
63 {
64 pollidxs [fd] = -1;
65 polls [idx] = polls [pollcnt];
66 pollidxs [polls [idx].fd] = idx;
67 }
68 }
69 }
70
71 static void
72 poll_poll (EV_P_ ev_tstamp timeout)
73 {
74 int res = poll (polls, pollcnt, ceil (timeout * 1000.));
75
76 if (res > 0)
77 {
78 int i;
79
80 for (i = 0; i < pollcnt; ++i)
81 fd_event (
82 EV_A_
83 polls [i].fd,
84 (polls [i].revents & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
85 | (polls [i].revents & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
86 );
87 }
88 else if (res < 0)
89 {
90 if (errno == EBADF)
91 fd_ebadf (EV_A);
92 else if (errno == ENOMEM)
93 fd_enomem (EV_A);
94 }
95 }
96
97 static int
98 poll_init (EV_P_ int flags)
99 {
100 method_fudge = 1e-3; /* needed to compensate for select returning early, very conservative */
101 method_modify = poll_modify;
102 method_poll = poll_poll;
103
104 return EVMETHOD_POLL;
105 }