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Comparing libev/ev_kqueue.c (file contents):
Revision 1.10 by root, Tue Nov 6 00:52:33 2007 UTC vs.
Revision 1.56 by root, Thu Feb 18 04:48:05 2016 UTC

1/* 1/*
2 * libev kqueue backend
3 *
2 * Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011,2012,2013 Marc Alexander Lehmann <libev@schmorp.de>
3 * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
4 * All rights reserved. 5 * All rights reserved.
5 * 6 *
6 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
7 * modification, are permitted provided that the following conditions 8 * tion, are permitted provided that the following conditions are met:
8 * are met:
9 * 9 *
10 * 1. Redistributions of source code must retain the above copyright 10 * 1. Redistributions of source code must retain the above copyright notice,
11 * notice, this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
12 *
12 * 2. Redistributions in binary form must reproduce the above copyright 13 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the 14 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution. 15 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 * 16 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
28 */ 38 */
29 39
30#include <sys/types.h> 40#include <sys/types.h>
31#include <sys/time.h> 41#include <sys/time.h>
32#include <sys/queue.h>
33#include <sys/event.h> 42#include <sys/event.h>
34#include <string.h> 43#include <string.h>
35#include <errno.h> 44#include <errno.h>
36 45
37static void 46inline_speed
47void
38kqueue_change (EV_P_ int fd, int filter, int flags, int fflags) 48kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
39{ 49{
40 struct kevent *ke; 50 ++kqueue_changecnt;
41
42 array_needsize (kqueue_changes, kqueue_changemax, ++kqueue_changecnt, ); 51 array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
43 52
44 ke = &kqueue_changes [kqueue_changecnt - 1]; 53 EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);
45 memset (ke, 0, sizeof (struct kevent));
46 ke->ident = fd;
47 ke->filter = filter;
48 ke->flags = flags;
49 ke->fflags = fflags;
50} 54}
51 55
56/* OS X at least needs this */
57#ifndef EV_ENABLE
58# define EV_ENABLE 0
59#endif
52#ifndef NOTE_EOF 60#ifndef NOTE_EOF
53# define NOTE_EOF 0 61# define NOTE_EOF 0
54#endif 62#endif
55 63
56static void 64static void
57kqueue_modify (EV_P_ int fd, int oev, int nev) 65kqueue_modify (EV_P_ int fd, int oev, int nev)
58{ 66{
59 if ((oev ^ nev) & EV_READ) 67 if (oev != nev)
60 { 68 {
61 if (nev & EV_READ) 69 if (oev & EV_READ)
62 kqueue_change (fd, EVFILT_READ, EV_ADD, NOTE_EOF);
63 else
64 kqueue_change (fd, EVFILT_READ, EV_DELETE, 0); 70 kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0);
65 }
66 71
67 if ((oev ^ nev) & EV_WRITE)
68 {
69 if (nev & EV_WRITE) 72 if (oev & EV_WRITE)
70 kqueue_change (fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
71 else
72 kqueue_change (fd, EVFILT_WRITE, EV_DELETE, 0); 73 kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
73 } 74 }
75
76 /* to detect close/reopen reliably, we have to re-add */
77 /* event requests even when oev == nev */
78
79 if (nev & EV_READ)
80 kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD | EV_ENABLE, NOTE_EOF);
81
82 if (nev & EV_WRITE)
83 kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD | EV_ENABLE, NOTE_EOF);
74} 84}
75 85
76static void 86static void
77kqueue_poll (EV_P_ ev_tstamp timeout) 87kqueue_poll (EV_P_ ev_tstamp timeout)
78{ 88{
79 int res, i; 89 int res, i;
80 struct timespec ts; 90 struct timespec ts;
81 91
82 ts.tv_sec = (time_t)timeout; 92 /* need to resize so there is enough space for errors */
83 ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; 93 if (kqueue_changecnt > kqueue_eventmax)
94 {
95 ev_free (kqueue_events);
96 kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt);
97 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
98 }
99
100 EV_RELEASE_CB;
101 EV_TS_SET (ts, timeout);
84 res = kevent (kqueue_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts); 102 res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
103 EV_ACQUIRE_CB;
85 kqueue_changecnt = 0; 104 kqueue_changecnt = 0;
86 105
87 if (res < 0) 106 if (expect_false (res < 0))
88 { 107 {
89 if (errno != EINTR) 108 if (errno != EINTR)
90 syserr ("(libev) kevent"); 109 ev_syserr ("(libev) kevent");
91 110
92 return; 111 return;
93 } 112 }
94 113
95 for (i = 0; i < res; ++i) 114 for (i = 0; i < res; ++i)
96 { 115 {
116 int fd = kqueue_events [i].ident;
117
97 if (kqueue_events [i].flags & EV_ERROR) 118 if (expect_false (kqueue_events [i].flags & EV_ERROR))
98 { 119 {
99 /* 120 int err = kqueue_events [i].data;
100 * Error messages that can happen, when a delete fails. 121
101 * EBADF happens when the file discriptor has been 122 /* we are only interested in errors for fds that we are interested in :) */
102 * closed, 123 if (anfds [fd].events)
103 * ENOENT when the file discriptor was closed and
104 * then reopened.
105 * EINVAL for some reasons not understood; EINVAL
106 * should not be returned ever; but FreeBSD does :-\
107 * An error is also indicated when a callback deletes
108 * an event we are still processing. In that case
109 * the data field is set to ENOENT.
110 */ 124 {
111 if (kqueue_events [i].data == EBADF) 125 if (err == ENOENT) /* resubmit changes on ENOENT */
112 fd_kill (EV_A_ kqueue_events [i].ident); 126 kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
127 else if (err == EBADF) /* on EBADF, we re-check the fd */
128 {
129 if (fd_valid (fd))
130 kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
131 else
132 fd_kill (EV_A_ fd);
133 }
134 else /* on all other errors, we error out on the fd */
135 fd_kill (EV_A_ fd);
136 }
113 } 137 }
114 else 138 else
115 fd_event ( 139 fd_event (
116 EV_A_ 140 EV_A_
117 kqueue_events [i].ident, 141 fd,
118 kqueue_events [i].filter == EVFILT_READ ? EV_READ 142 kqueue_events [i].filter == EVFILT_READ ? EV_READ
119 : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE 143 : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE
120 : 0 144 : 0
121 ); 145 );
122 } 146 }
123 147
124 if (expect_false (res == kqueue_eventmax)) 148 if (expect_false (res == kqueue_eventmax))
125 { 149 {
126 ev_free (kqueue_events); 150 ev_free (kqueue_events);
127 kqueue_eventmax = array_roundsize (kqueue_events, kqueue_eventmax << 1); 151 kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1);
128 kqueue_events = ev_malloc (sizeof (struct kevent) * kqueue_eventmax); 152 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
129 } 153 }
130} 154}
131 155
132static int 156inline_size
157int
133kqueue_init (EV_P_ int flags) 158kqueue_init (EV_P_ int flags)
134{ 159{
135 struct kevent ch, ev;
136
137 /* Initalize the kernel queue */ 160 /* initialize the kernel queue */
138 if ((kqueue_fd = kqueue ()) < 0) 161 kqueue_fd_pid = getpid ();
162 if ((backend_fd = kqueue ()) < 0)
139 return 0; 163 return 0;
140 164
141 fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ 165 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
142 166
143 /* Check for Mac OS X kqueue bug. */ 167 backend_mintime = 1e-9; /* apparently, they did the right thing in freebsd */
144 ch.ident = -1;
145 ch.filter = EVFILT_READ;
146 ch.flags = EV_ADD;
147
148 /*
149 * If kqueue works, then kevent will succeed, and it will
150 * stick an error in ev. If kqueue is broken, then
151 * kevent will fail.
152 */
153 if (kevent (kqueue_fd, &ch, 1, &ev, 1, 0) != 1
154 || ev.ident != -1
155 || ev.flags != EV_ERROR)
156 {
157 /* detected broken kqueue */
158 close (kqueue_fd);
159 return 0;
160 }
161
162 method_fudge = 1e-3; /* needed to compensate for kevent returning early */
163 method_modify = kqueue_modify; 168 backend_modify = kqueue_modify;
164 method_poll = kqueue_poll; 169 backend_poll = kqueue_poll;
165 170
166 kqueue_eventmax = 64; /* intiial number of events receivable per poll */ 171 kqueue_eventmax = 64; /* initial number of events receivable per poll */
167 kqueue_events = ev_malloc (sizeof (struct kevent) * kqueue_eventmax); 172 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
168 173
169 kqueue_changes = 0; 174 kqueue_changes = 0;
170 kqueue_changemax = 0; 175 kqueue_changemax = 0;
171 kqueue_changecnt = 0; 176 kqueue_changecnt = 0;
172 177
173 return EVMETHOD_KQUEUE; 178 return EVBACKEND_KQUEUE;
174} 179}
175 180
176static void 181inline_size
182void
177kqueue_destroy (EV_P) 183kqueue_destroy (EV_P)
178{ 184{
179 close (kqueue_fd);
180
181 ev_free (kqueue_events); 185 ev_free (kqueue_events);
182 ev_free (kqueue_changes); 186 ev_free (kqueue_changes);
183} 187}
184 188
185static void 189inline_size
190void
186kqueue_fork (EV_P) 191kqueue_fork (EV_P)
187{ 192{
188 for (;;) 193 /* some BSD kernels don't just destroy the kqueue itself,
189 { 194 * but also close the fd, which isn't documented, and
190 kqueue_fd = kqueue (); 195 * impossible to support properly.
196 * we remember the pid of the kqueue call and only close
197 * the fd if the pid is still the same.
198 * this leaks fds on sane kernels, but BSD interfaces are
199 * notoriously buggy and rarely get fixed.
200 */
201 pid_t newpid = getpid ();
191 202
192 if (kqueue_fd >= 0) 203 if (newpid == kqueue_fd_pid)
193 break; 204 close (backend_fd);
194 205
206 kqueue_fd_pid = newpid;
207 while ((backend_fd = kqueue ()) < 0)
195 syserr ("(libev) kqueue"); 208 ev_syserr ("(libev) kqueue");
196 }
197 209
198 fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); 210 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
199 211
200 /* re-register interest in fds */ 212 /* re-register interest in fds */
201 fd_rearm_all (EV_A); 213 fd_rearm_all (EV_A);
202} 214}
203 215
216/* sys/event.h defines EV_ERROR */
217#undef EV_ERROR
218

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