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/cvs/libev/ev_kqueue.c
Revision: 1.40
Committed: Sun Jul 19 04:11:27 2009 UTC (14 years, 9 months ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: rel-3_9, rel-3_8
Changes since 1.39: +1 -1 lines
Log Message:
*** empty log message ***

File Contents

# User Rev Content
1 root 1.1 /*
2 root 1.26 * libev kqueue backend
3     *
4 root 1.40 * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de>
5 root 1.1 * All rights reserved.
6     *
7 root 1.33 * Redistribution and use in source and binary forms, with or without modifica-
8     * tion, are permitted provided that the following conditions are met:
9     *
10     * 1. Redistributions of source code must retain the above copyright notice,
11     * this list of conditions and the following disclaimer.
12     *
13     * 2. Redistributions in binary form must reproduce the above copyright
14     * notice, this list of conditions and the following disclaimer in the
15     * documentation and/or other materials provided with the distribution.
16     *
17     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19     * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20     * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21     * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25     * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26     * OF THE POSSIBILITY OF SUCH DAMAGE.
27 root 1.26 *
28 root 1.33 * 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.
38 root 1.1 */
39    
40     #include <sys/types.h>
41     #include <sys/time.h>
42     #include <sys/queue.h>
43     #include <sys/event.h>
44     #include <string.h>
45     #include <errno.h>
46    
47 root 1.27 void inline_speed
48 root 1.6 kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
49 root 1.1 {
50 ayin 1.16 ++kqueue_changecnt;
51 root 1.17 array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
52 root 1.1
53 root 1.23 EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);
54 root 1.1 }
55    
56 root 1.4 #ifndef NOTE_EOF
57     # define NOTE_EOF 0
58     #endif
59    
60 root 1.1 static void
61 root 1.6 kqueue_modify (EV_P_ int fd, int oev, int nev)
62 root 1.1 {
63 root 1.22 if (oev != nev)
64     {
65     if (oev & EV_READ)
66     kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0);
67 root 1.14
68 root 1.22 if (oev & EV_WRITE)
69     kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
70     }
71 root 1.14
72 root 1.22 /* to detect close/reopen reliably, we have to re-add */
73     /* event requests even when oev == nev */
74 root 1.14
75     if (nev & EV_READ)
76 root 1.22 kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD, NOTE_EOF);
77 root 1.1
78 root 1.14 if (nev & EV_WRITE)
79     kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
80 root 1.1 }
81    
82     static void
83 root 1.6 kqueue_poll (EV_P_ ev_tstamp timeout)
84 root 1.1 {
85     int res, i;
86     struct timespec ts;
87    
88 root 1.14 /* need to resize so there is enough space for errors */
89     if (kqueue_changecnt > kqueue_eventmax)
90     {
91     ev_free (kqueue_events);
92 root 1.28 kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt);
93 root 1.15 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
94 root 1.14 }
95    
96 root 1.39 EV_RELEASE_CB;
97 root 1.1 ts.tv_sec = (time_t)timeout;
98 root 1.18 ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9);
99 root 1.25 res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
100 root 1.39 EV_ACQUIRE_CB;
101 root 1.6 kqueue_changecnt = 0;
102 root 1.1
103 root 1.29 if (expect_false (res < 0))
104 root 1.9 {
105     if (errno != EINTR)
106 root 1.35 ev_syserr ("(libev) kevent");
107 root 1.9
108     return;
109     }
110 root 1.1
111     for (i = 0; i < res; ++i)
112     {
113 root 1.14 int fd = kqueue_events [i].ident;
114    
115 root 1.24 if (expect_false (kqueue_events [i].flags & EV_ERROR))
116 root 1.1 {
117 root 1.14 int err = kqueue_events [i].data;
118    
119     /* we are only interested in errors for fds that we are interested in :) */
120     if (anfds [fd].events)
121     {
122     if (err == ENOENT) /* resubmit changes on ENOENT */
123     kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
124     else if (err == EBADF) /* on EBADF, we re-check the fd */
125     {
126     if (fd_valid (fd))
127     kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
128     else
129     fd_kill (EV_A_ fd);
130     }
131     else /* on all other errors, we error out on the fd */
132     fd_kill (EV_A_ fd);
133     }
134 root 1.1 }
135     else
136 root 1.3 fd_event (
137 root 1.6 EV_A_
138 root 1.14 fd,
139 root 1.6 kqueue_events [i].filter == EVFILT_READ ? EV_READ
140     : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE
141 root 1.1 : 0
142     );
143     }
144    
145 root 1.6 if (expect_false (res == kqueue_eventmax))
146 root 1.1 {
147 root 1.9 ev_free (kqueue_events);
148 root 1.28 kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1);
149 root 1.15 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
150 root 1.1 }
151     }
152    
153 root 1.27 int inline_size
154 root 1.6 kqueue_init (EV_P_ int flags)
155 root 1.1 {
156     /* Initalize the kernel queue */
157 root 1.25 if ((backend_fd = kqueue ()) < 0)
158 root 1.6 return 0;
159 root 1.1
160 root 1.25 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
161 root 1.7
162 root 1.31 backend_fudge = 0.;
163 root 1.21 backend_modify = kqueue_modify;
164     backend_poll = kqueue_poll;
165 root 1.1
166 root 1.26 kqueue_eventmax = 64; /* initial number of events receivable per poll */
167 root 1.15 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
168 root 1.6
169 root 1.7 kqueue_changes = 0;
170     kqueue_changemax = 0;
171     kqueue_changecnt = 0;
172    
173 root 1.20 return EVBACKEND_KQUEUE;
174 root 1.1 }
175    
176 root 1.27 void inline_size
177 root 1.7 kqueue_destroy (EV_P)
178     {
179 root 1.9 ev_free (kqueue_events);
180     ev_free (kqueue_changes);
181 root 1.7 }
182    
183 root 1.27 void inline_size
184 root 1.7 kqueue_fork (EV_P)
185     {
186 root 1.25 close (backend_fd);
187 root 1.10
188 root 1.25 while ((backend_fd = kqueue ()) < 0)
189 root 1.35 ev_syserr ("(libev) kqueue");
190 root 1.10
191 root 1.25 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
192 root 1.7
193     /* re-register interest in fds */
194 root 1.8 fd_rearm_all (EV_A);
195 root 1.7 }
196