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Comparing libev/ev_epoll.c (file contents):
Revision 1.5 by root, Wed Oct 31 14:44:15 2007 UTC vs.
Revision 1.18 by root, Sun Nov 4 22:03:17 2007 UTC

1/* 1/*
2 * libev epoll fd activity backend
3 *
2 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
3 * All rights reserved. 5 * All rights reserved.
4 * 6 *
5 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are 8 * modification, are permitted provided that the following conditions are
… …
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */ 30 */
29 31
30#include <sys/epoll.h> 32#include <sys/epoll.h>
31 33
32static int epoll_fd = -1;
33
34static void 34static void
35epoll_modify (int fd, int oev, int nev) 35epoll_modify (EV_P_ int fd, int oev, int nev)
36{ 36{
37 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;
38 38
39 struct epoll_event ev; 39 struct epoll_event ev;
40 ev.data.fd = fd; 40 ev.data.u64 = fd; /* use u64 to fully initialise the struct, for nicer strace etc. */
41 ev.events = 41 ev.events =
42 (nev & EV_READ ? EPOLLIN : 0) 42 (nev & EV_READ ? EPOLLIN : 0)
43 | (nev & EV_WRITE ? EPOLLOUT : 0); 43 | (nev & EV_WRITE ? EPOLLOUT : 0);
44 44
45 epoll_ctl (epoll_fd, mode, fd, &ev); 45 if (epoll_ctl (epoll_fd, mode, fd, &ev))
46 fd_kill (EV_A_ fd);
46} 47}
47 48
48void epoll_postfork_child (void) 49static void
50epoll_poll (EV_P_ ev_tstamp timeout)
49{ 51{
50 int fd;
51
52 epoll_fd = epoll_create (256);
53 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
54
55 /* re-register interest in fds */
56 for (fd = 0; fd < anfdmax; ++fd)
57 if (anfds [fd].wev)
58 epoll_modify (fd, EV_NONE, anfds [fd].wev);
59}
60
61static struct epoll_event *events;
62static int eventmax;
63
64static void epoll_poll (ev_tstamp timeout)
65{
66 int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.)); 52 int eventcnt = epoll_wait (epoll_fd, epoll_events, epoll_eventmax, ceil (timeout * 1000.));
67 int i; 53 int i;
68 54
69 if (eventcnt < 0) 55 if (eventcnt < 0)
70 return; 56 return;
71 57
72 for (i = 0; i < eventcnt; ++i) 58 for (i = 0; i < eventcnt; ++i)
73 fd_event ( 59 fd_event (
60 EV_A_
74 events [i].data.fd, 61 epoll_events [i].data.u64,
75 (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) 62 (epoll_events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
76 | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) 63 | (epoll_events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
77 ); 64 );
78 65
79 /* if the receive array was full, increase its size */ 66 /* if the receive array was full, increase its size */
80 if (eventcnt == eventmax) 67 if (expect_false (eventcnt == epoll_eventmax))
81 { 68 {
82 free (events); 69 free (epoll_events);
83 eventmax += eventmax >> 1; 70 epoll_eventmax = array_roundsize (epoll_events, epoll_eventmax << 1);
84 events = malloc (sizeof (struct epoll_event) * eventmax); 71 epoll_events = malloc (sizeof (struct epoll_event) * epoll_eventmax);
85 } 72 }
86} 73}
87 74
75static int
88void epoll_init (int flags) 76epoll_init (EV_P_ int flags)
89{ 77{
90 epoll_fd = epoll_create (256); 78 epoll_fd = epoll_create (256);
91 79
92 if (epoll_fd < 0) 80 if (epoll_fd < 0)
93 return; 81 return 0;
94 82
95 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); 83 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
96 84
97 ev_method = EVMETHOD_EPOLL;
98 method_fudge = 1e-3; /* needed to compensate for epoll returning early */ 85 method_fudge = 1e-3; /* needed to compensate for epoll returning early */
99 method_modify = epoll_modify; 86 method_modify = epoll_modify;
100 method_poll = epoll_poll; 87 method_poll = epoll_poll;
101 88
102 eventmax = 64; /* intiial number of events receivable per poll */ 89 epoll_eventmax = 64; /* intiial number of events receivable per poll */
103 events = malloc (sizeof (struct epoll_event) * eventmax); 90 epoll_events = malloc (sizeof (struct epoll_event) * epoll_eventmax);
91
92 return EVMETHOD_EPOLL;
104} 93}
94
95static void
96epoll_destroy (EV_P)
97{
98 close (epoll_fd);
99
100 free (epoll_events);
101}
102
103static void
104epoll_fork (EV_P)
105{
106 epoll_fd = epoll_create (256);
107 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
108
109 fd_rearm_all (EV_A);
110}
111

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