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Comparing libev/ev_epoll.c (file contents):
Revision 1.4 by root, Wed Oct 31 11:56:34 2007 UTC vs.
Revision 1.19 by root, Sun Nov 4 23:14:11 2007 UTC

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
1#include <sys/epoll.h> 32#include <sys/epoll.h>
2 33
3static int epoll_fd = -1;
4
5static void 34static void
6epoll_modify (int fd, int oev, int nev) 35epoll_modify (EV_P_ int fd, int oev, int nev)
7{ 36{
8 int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL; 37 int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
9 38
10 struct epoll_event ev; 39 struct epoll_event ev;
11 ev.data.fd = fd; 40 ev.data.u64 = fd; /* use u64 to fully initialise the struct, for nicer strace etc. */
12 ev.events = 41 ev.events =
13 (nev & EV_READ ? EPOLLIN : 0) 42 (nev & EV_READ ? EPOLLIN : 0)
14 | (nev & EV_WRITE ? EPOLLOUT : 0); 43 | (nev & EV_WRITE ? EPOLLOUT : 0);
15 44
16 epoll_ctl (epoll_fd, mode, fd, &ev); 45 if (epoll_ctl (epoll_fd, mode, fd, &ev))
46 if (errno != ENOENT /* on ENOENT the fd went away, so try to do the right thing */
47 || (nev && epoll_ctl (epoll_fd, EPOLL_CTL_ADD, fd, &ev)))
48 fd_kill (EV_A_ fd);
17} 49}
18 50
19void epoll_postfork_child (void) 51static void
52epoll_poll (EV_P_ ev_tstamp timeout)
20{ 53{
21 int fd;
22
23 epoll_fd = epoll_create (256);
24 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
25
26 /* re-register interest in fds */
27 for (fd = 0; fd < anfdmax; ++fd)
28 if (anfds [fd].wev)
29 epoll_modify (fd, EV_NONE, anfds [fd].wev);
30}
31
32static struct epoll_event *events;
33static int eventmax;
34
35static void epoll_poll (ev_tstamp timeout)
36{
37 int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.)); 54 int eventcnt = epoll_wait (epoll_fd, epoll_events, epoll_eventmax, ceil (timeout * 1000.));
38 int i; 55 int i;
39 56
40 if (eventcnt < 0) 57 if (eventcnt < 0)
41 return; 58 return;
42 59
43 for (i = 0; i < eventcnt; ++i) 60 for (i = 0; i < eventcnt; ++i)
44 fd_event ( 61 fd_event (
62 EV_A_
45 events [i].data.fd, 63 epoll_events [i].data.u64,
46 (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) 64 (epoll_events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
47 | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) 65 | (epoll_events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
48 ); 66 );
49 67
50 /* if the receive array was full, increase its size */ 68 /* if the receive array was full, increase its size */
51 if (eventcnt == eventmax) 69 if (expect_false (eventcnt == epoll_eventmax))
52 { 70 {
53 free (events); 71 free (epoll_events);
54 eventmax += eventmax >> 1; 72 epoll_eventmax = array_roundsize (epoll_events, epoll_eventmax << 1);
55 events = malloc (sizeof (struct epoll_event) * eventmax); 73 epoll_events = malloc (sizeof (struct epoll_event) * epoll_eventmax);
56 } 74 }
57} 75}
58 76
77static int
59void epoll_init (int flags) 78epoll_init (EV_P_ int flags)
60{ 79{
61 epoll_fd = epoll_create (256); 80 epoll_fd = epoll_create (256);
62 81
63 if (epoll_fd < 0) 82 if (epoll_fd < 0)
64 return; 83 return 0;
65 84
66 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); 85 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
67 86
68 ev_method = EVMETHOD_EPOLL;
69 method_fudge = 1e-3; /* needed to compensate for epoll returning early */ 87 method_fudge = 1e-3; /* needed to compensate for epoll returning early */
70 method_modify = epoll_modify; 88 method_modify = epoll_modify;
71 method_poll = epoll_poll; 89 method_poll = epoll_poll;
72 90
73 eventmax = 64; /* intiial number of events receivable per poll */ 91 epoll_eventmax = 64; /* intiial number of events receivable per poll */
74 events = malloc (sizeof (struct epoll_event) * eventmax); 92 epoll_events = malloc (sizeof (struct epoll_event) * epoll_eventmax);
93
94 return EVMETHOD_EPOLL;
75} 95}
96
97static void
98epoll_destroy (EV_P)
99{
100 close (epoll_fd);
101
102 free (epoll_events);
103}
104
105static void
106epoll_fork (EV_P)
107{
108 epoll_fd = epoll_create (256);
109 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
110
111 fd_rearm_all (EV_A);
112}
113

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