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Comparing libev/ev_epoll.c (file contents):
Revision 1.7 by root, Wed Oct 31 22:16:37 2007 UTC vs.
Revision 1.22 by root, Tue Nov 6 01:17:16 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 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);
46} 49}
47 50
48static void 51static void
49epoll_postfork_child (void) 52epoll_poll (EV_P_ ev_tstamp timeout)
50{ 53{
51 int fd;
52
53 epoll_fd = epoll_create (256);
54 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
55
56 /* re-register interest in fds */
57 for (fd = 0; fd < anfdmax; ++fd)
58 if (anfds [fd].events && !(anfds [fd].events & EV_REIFY))//D
59 epoll_modify (fd, EV_NONE, anfds [fd].events);
60}
61
62static struct epoll_event *events;
63static int eventmax;
64
65static void
66epoll_poll (ev_tstamp timeout)
67{
68 int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
69 int i; 54 int i;
55 int eventcnt = epoll_wait (epoll_fd, epoll_events, epoll_eventmax, ceil (timeout * 1000.));
70 56
71 if (eventcnt < 0) 57 if (eventcnt < 0)
58 {
59 if (errno != EINTR)
60 syserr ("(libev) epoll_wait");
61
72 return; 62 return;
63 }
73 64
74 for (i = 0; i < eventcnt; ++i) 65 for (i = 0; i < eventcnt; ++i)
75 fd_event ( 66 fd_event (
67 EV_A_
76 events [i].data.fd, 68 epoll_events [i].data.u64,
77 (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) 69 (epoll_events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
78 | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) 70 | (epoll_events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
79 ); 71 );
80 72
81 /* if the receive array was full, increase its size */ 73 /* if the receive array was full, increase its size */
82 if (eventcnt == eventmax) 74 if (expect_false (eventcnt == epoll_eventmax))
83 { 75 {
84 free (events); 76 ev_free (epoll_events);
85 eventmax += eventmax >> 1; 77 epoll_eventmax = array_roundsize (epoll_events, epoll_eventmax << 1);
86 events = malloc (sizeof (struct epoll_event) * eventmax); 78 epoll_events = ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
87 } 79 }
88} 80}
89 81
90static void 82static int
91epoll_init (int flags) 83epoll_init (EV_P_ int flags)
92{ 84{
93 epoll_fd = epoll_create (256); 85 epoll_fd = epoll_create (256);
94 86
95 if (epoll_fd < 0) 87 if (epoll_fd < 0)
96 return; 88 return 0;
97 89
98 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); 90 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
99 91
100 ev_method = EVMETHOD_EPOLL;
101 method_fudge = 1e-3; /* needed to compensate for epoll returning early */ 92 method_fudge = 1e-3; /* needed to compensate for epoll returning early */
102 method_modify = epoll_modify; 93 method_modify = epoll_modify;
103 method_poll = epoll_poll; 94 method_poll = epoll_poll;
104 95
105 eventmax = 64; /* intiial number of events receivable per poll */ 96 epoll_eventmax = 64; /* intiial number of events receivable per poll */
106 events = malloc (sizeof (struct epoll_event) * eventmax); 97 epoll_events = ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
98
99 return EVMETHOD_EPOLL;
107} 100}
108 101
102static void
103epoll_destroy (EV_P)
104{
105 close (epoll_fd);
106
107 ev_free (epoll_events);
108}
109
110static void
111epoll_fork (EV_P)
112{
113 close (epoll_fd);
114
115 while ((epoll_fd = epoll_create (256)) < 0)
116 syserr ("(libev) epoll_create");
117
118 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
119
120 fd_rearm_all (EV_A);
121}
122

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