ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev_epoll.c
(Generate patch)

Comparing libev/ev_epoll.c (file contents):
Revision 1.5 by root, Wed Oct 31 14:44:15 2007 UTC vs.
Revision 1.28 by root, Wed Dec 5 13:54:36 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 (backend_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 (backend_fd, EPOLL_CTL_ADD, fd, &ev)))
48 fd_kill (EV_A_ fd);
46} 49}
47 50
48void epoll_postfork_child (void) 51static void
52epoll_poll (EV_P_ ev_tstamp timeout)
49{ 53{
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.));
67 int i; 54 int i;
55 int eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, (int)ceil (timeout * 1000.));
68 56
69 if (eventcnt < 0) 57 if (eventcnt < 0)
58 {
59 if (errno != EINTR)
60 syserr ("(libev) epoll_wait");
61
70 return; 62 return;
63 }
71 64
72 for (i = 0; i < eventcnt; ++i) 65 for (i = 0; i < eventcnt; ++i)
73 fd_event ( 66 fd_event (
67 EV_A_
74 events [i].data.fd, 68 epoll_events [i].data.u64,
75 (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) 69 (epoll_events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
76 | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) 70 | (epoll_events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
77 ); 71 );
78 72
79 /* if the receive array was full, increase its size */ 73 /* if the receive array was full, increase its size */
80 if (eventcnt == eventmax) 74 if (expect_false (eventcnt == epoll_eventmax))
81 { 75 {
82 free (events); 76 ev_free (epoll_events);
83 eventmax += eventmax >> 1; 77 epoll_eventmax = array_nextsize (sizeof (struct epoll_event), epoll_eventmax, epoll_eventmax + 1);
84 events = malloc (sizeof (struct epoll_event) * eventmax); 78 epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
85 } 79 }
86} 80}
87 81
82int inline_size
88void epoll_init (int flags) 83epoll_init (EV_P_ int flags)
89{ 84{
90 epoll_fd = epoll_create (256); 85 backend_fd = epoll_create (256);
91 86
92 if (epoll_fd < 0) 87 if (backend_fd < 0)
93 return; 88 return 0;
94 89
95 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); 90 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
96 91
97 ev_method = EVMETHOD_EPOLL;
98 method_fudge = 1e-3; /* needed to compensate for epoll returning early */ 92 backend_fudge = 1e-3; /* needed to compensate for epoll returning early */
99 method_modify = epoll_modify; 93 backend_modify = epoll_modify;
100 method_poll = epoll_poll; 94 backend_poll = epoll_poll;
101 95
102 eventmax = 64; /* intiial number of events receivable per poll */ 96 epoll_eventmax = 64; /* intiial number of events receivable per poll */
103 events = malloc (sizeof (struct epoll_event) * eventmax); 97 epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
98
99 return EVBACKEND_EPOLL;
104} 100}
101
102void inline_size
103epoll_destroy (EV_P)
104{
105 ev_free (epoll_events);
106}
107
108void inline_size
109epoll_fork (EV_P)
110{
111 close (backend_fd);
112
113 while ((backend_fd = epoll_create (256)) < 0)
114 syserr ("(libev) epoll_create");
115
116 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
117
118 fd_rearm_all (EV_A);
119}
120

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines