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Comparing libev/ev_kqueue.c (file contents):
Revision 1.4 by root, Sat Nov 3 16:23:11 2007 UTC vs.
Revision 1.21 by root, Fri Nov 23 05:13:49 2007 UTC

… …
32#include <sys/queue.h> 32#include <sys/queue.h>
33#include <sys/event.h> 33#include <sys/event.h>
34#include <string.h> 34#include <string.h>
35#include <errno.h> 35#include <errno.h>
36 36
37static int kq_fd;
38static struct kevent *kq_changes;
39static int kq_changemax, kq_changecnt;
40static struct kevent *kq_events;
41static int kq_eventmax;
42
43static void 37static void
44kqueue_change (int fd, int filter, int flags, int fflags) 38kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
45{ 39{
46 struct kevent *ke; 40 struct kevent *ke;
47 41
42 ++kqueue_changecnt;
48 array_needsize (kq_changes, kq_changemax, ++kq_changecnt, ); 43 array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
49 44
50 ke = &kq_changes [kq_changecnt - 1]; 45 ke = &kqueue_changes [kqueue_changecnt - 1];
51 memset (ke, 0, sizeof (struct kevent)); 46 memset (ke, 0, sizeof (struct kevent));
52 ke->ident = fd; 47 ke->ident = fd;
53 ke->filter = filter; 48 ke->filter = filter;
54 ke->flags = flags; 49 ke->flags = flags;
55 ke->fflags = fflags; 50 ke->fflags = fflags;
… …
58#ifndef NOTE_EOF 53#ifndef NOTE_EOF
59# define NOTE_EOF 0 54# define NOTE_EOF 0
60#endif 55#endif
61 56
62static void 57static void
63kqueue_modify (int fd, int oev, int nev) 58kqueue_modify (EV_P_ int fd, int oev, int nev)
64{ 59{
60 /* to detect close/reopen reliably, we have to remove and re-add */
61 /* event requests even when oev == nev */
62
65 if ((oev ^ nev) & EV_READ) 63 if (oev & EV_READ)
66 { 64 kqueue_change (EV_A_ fd, EVFILT_READ, EV_DELETE, 0);
65
66 if (oev & EV_WRITE)
67 kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
68
67 if (nev & EV_READ) 69 if (nev & EV_READ)
68 kqueue_change (fd, EVFILT_READ, EV_ADD, NOTE_EOF); 70 kqueue_change (EV_A_ fd, EVFILT_READ, EV_ADD, NOTE_EOF);
69 else
70 kqueue_change (fd, EVFILT_READ, EV_DELETE, 0);
71 }
72 71
73 if ((oev ^ nev) & EV_WRITE)
74 {
75 if (nev & EV_WRITE) 72 if (nev & EV_WRITE)
76 kqueue_change (fd, EVFILT_WRITE, EV_ADD, NOTE_EOF); 73 kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
77 else
78 kqueue_change (fd, EVFILT_WRITE, EV_DELETE, 0);
79 }
80} 74}
81 75
82static void 76static void
83kqueue_poll (ev_tstamp timeout) 77kqueue_poll (EV_P_ ev_tstamp timeout)
84{ 78{
85 int res, i; 79 int res, i;
86 struct timespec ts; 80 struct timespec ts;
87 81
82 /* need to resize so there is enough space for errors */
83 if (kqueue_changecnt > kqueue_eventmax)
84 {
85 ev_free (kqueue_events);
86 kqueue_eventmax = array_roundsize (struct kevent, kqueue_changecnt);
87 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
88 }
89
88 ts.tv_sec = (time_t)timeout; 90 ts.tv_sec = (time_t)timeout;
89 ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; 91 ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9);
90 res = kevent (kq_fd, kq_changes, kq_changecnt, kq_events, kq_eventmax, &ts); 92 res = kevent (kqueue_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
91 kq_changecnt = 0; 93 kqueue_changecnt = 0;
92 94
93 if (res < 0) 95 if (res < 0)
96 {
97 if (errno != EINTR)
98 syserr ("(libev) kevent");
99
94 return; 100 return;
101 }
95 102
96 for (i = 0; i < res; ++i) 103 for (i = 0; i < res; ++i)
97 { 104 {
105 int fd = kqueue_events [i].ident;
106
98 if (kq_events [i].flags & EV_ERROR) 107 if (kqueue_events [i].flags & EV_ERROR)
99 { 108 {
109 int err = kqueue_events [i].data;
110
100 /* 111 /*
101 * Error messages that can happen, when a delete fails. 112 * errors that may happen
102 * EBADF happens when the file discriptor has been 113 * EBADF happens when the file discriptor has been
103 * closed, 114 * closed,
104 * ENOENT when the file discriptor was closed and 115 * ENOENT when the file descriptor was closed and
105 * then reopened. 116 * then reopened.
106 * EINVAL for some reasons not understood; EINVAL 117 * EINVAL for some reasons not understood; EINVAL
107 * should not be returned ever; but FreeBSD does :-\ 118 * should not be returned ever; but FreeBSD does :-\
108 * An error is also indicated when a callback deletes
109 * an event we are still processing. In that case
110 * the data field is set to ENOENT.
111 */ 119 */
112 if (kq_events [i].data == EBADF) 120
113 fd_kill (kq_events [i].ident); 121 /* we are only interested in errors for fds that we are interested in :) */
122 if (anfds [fd].events)
123 {
124 if (err == ENOENT) /* resubmit changes on ENOENT */
125 kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
126 else if (err == EBADF) /* on EBADF, we re-check the fd */
127 {
128 if (fd_valid (fd))
129 kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
130 else
131 fd_kill (EV_A_ fd);
132 }
133 else /* on all other errors, we error out on the fd */
134 fd_kill (EV_A_ fd);
135 }
114 } 136 }
115 else 137 else
116 fd_event ( 138 fd_event (
117 kq_events [i].ident, 139 EV_A_
140 fd,
118 kq_events [i].filter == EVFILT_READ ? EV_READ 141 kqueue_events [i].filter == EVFILT_READ ? EV_READ
119 : kq_events [i].filter == EVFILT_WRITE ? EV_WRITE 142 : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE
120 : 0 143 : 0
121 ); 144 );
122 } 145 }
123 146
124 if (expect_false (res == kq_eventmax)) 147 if (expect_false (res == kqueue_eventmax))
125 { 148 {
126 free (kq_events); 149 ev_free (kqueue_events);
127 kq_eventmax = array_roundsize (kq_events, kq_eventmax << 1); 150 kqueue_eventmax = array_roundsize (struct kevent, kqueue_eventmax << 1);
128 kq_events = malloc (sizeof (struct kevent) * kq_eventmax); 151 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
129 } 152 }
130} 153}
131 154
132static void 155static int
133kqueue_init (int flags) 156kqueue_init (EV_P_ int flags)
134{ 157{
135 struct kevent ch, ev; 158 struct kevent ch, ev;
136 159
137 /* Initalize the kernel queue */ 160 /* Initalize the kernel queue */
138 if ((kq_fd = kqueue ()) < 0) 161 if ((kqueue_fd = kqueue ()) < 0)
139 return; 162 return 0;
163
164 fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
140 165
141 /* Check for Mac OS X kqueue bug. */ 166 /* Check for Mac OS X kqueue bug. */
142 ch.ident = -1; 167 ch.ident = -1;
143 ch.filter = EVFILT_READ; 168 ch.filter = EVFILT_READ;
144 ch.flags = EV_ADD; 169 ch.flags = EV_ADD;
… …
146 /* 171 /*
147 * If kqueue works, then kevent will succeed, and it will 172 * If kqueue works, then kevent will succeed, and it will
148 * stick an error in ev. If kqueue is broken, then 173 * stick an error in ev. If kqueue is broken, then
149 * kevent will fail. 174 * kevent will fail.
150 */ 175 */
151 if (kevent (kq_fd, &ch, 1, &ev, 1, 0) != 1 176 if (kevent (kqueue_fd, &ch, 1, &ev, 1, 0) != 1
152 || ev.ident != -1 177 || ev.ident != -1
153 || ev.flags != EV_ERROR) 178 || ev.flags != EV_ERROR)
154 { 179 {
155 /* detected broken kqueue */ 180 /* detected broken kqueue */
156 close (kq_fd); 181 close (kqueue_fd);
157 return; 182 return 0;
158 } 183 }
159 184
160 ev_method = EVMETHOD_KQUEUE;
161 method_fudge = 1e-3; /* needed to compensate for kevent returning early */ 185 backend_fudge = 1e-3; /* needed to compensate for kevent returning early */
162 method_modify = kq_modify; 186 backend_modify = kqueue_modify;
163 method_poll = kq_poll; 187 backend_poll = kqueue_poll;
164 188
165 kq_eventmax = 64; /* intiial number of events receivable per poll */ 189 kqueue_eventmax = 64; /* intiial number of events receivable per poll */
166 kq_events = malloc (sizeof (struct kevent) * kq_eventmax); 190 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
167}
168 191
192 kqueue_changes = 0;
193 kqueue_changemax = 0;
194 kqueue_changecnt = 0;
195
196 return EVBACKEND_KQUEUE;
197}
198
199static void
200kqueue_destroy (EV_P)
201{
202 close (kqueue_fd);
203
204 ev_free (kqueue_events);
205 ev_free (kqueue_changes);
206}
207
208static void
209kqueue_fork (EV_P)
210{
211 close (kqueue_fd);
212
213 while ((kqueue_fd = kqueue ()) < 0)
214 syserr ("(libev) kqueue");
215
216 fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC);
217
218 /* re-register interest in fds */
219 fd_rearm_all (EV_A);
220}
221

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