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Comparing libev/ev_port.c (file contents):
Revision 1.1 by root, Fri Nov 16 01:33:54 2007 UTC vs.
Revision 1.25 by root, Mon Jan 17 12:11:12 2011 UTC

1/* 1/*
2 * Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de> 2 * libev solaris event port backend
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * modification, are permitted provided that the following conditions 5 * All rights reserved.
6 * are met:
7 * 6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
8 * 1. Redistributions of source code must retain the above copyright 10 * 1. Redistributions of source code must retain the above copyright notice,
9 * notice, this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
12 *
10 * 2. Redistributions in binary form must reproduce the above copyright 13 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the 14 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution. 15 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products 16 *
14 * derived from this software without specific prior written permission. 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.
15 * 27 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 28 * Alternatively, the contents of this file may be used under the terms of
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 29 * the GNU General Public License ("GPL") version 2 or any later version,
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 30 * in which case the provisions of the GPL are applicable instead of
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 31 * the above. If you wish to allow the use of your version of this file
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 32 * only under the terms of the GPL and not to allow others to use your
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33 * version of this file under the BSD license, indicate your decision
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34 * by deleting the provisions above and replace them with the notice
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35 * and other provisions required by the GPL. If you do not delete the
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 36 * provisions above, a recipient may use your version of this file under
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 * either the BSD or the GPL.
38 */
39
40/* useful reading:
41 *
42 * http://bugs.opensolaris.org/view_bug.do?bug_id=6268715 (random results)
43 * http://bugs.opensolaris.org/view_bug.do?bug_id=6455223 (just totally broken)
44 * http://bugs.opensolaris.org/view_bug.do?bug_id=6873782 (manpage ETIME)
45 * http://bugs.opensolaris.org/view_bug.do?bug_id=6874410 (implementation ETIME)
46 * http://www.mail-archive.com/networking-discuss@opensolaris.org/msg11898.html ETIME vs. nget
47 * http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libc/port/gen/event_port.c (libc)
48 * http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/portfs/port.c#1325 (kernel)
26 */ 49 */
27 50
28#include <sys/types.h> 51#include <sys/types.h>
29#include <sys/time.h> 52#include <sys/time.h>
30#include <poll.h> 53#include <poll.h>
31#include <port.h> 54#include <port.h>
32#include <string.h> 55#include <string.h>
33#include <errno.h> 56#include <errno.h>
57
58void inline_speed
59port_associate_and_check (EV_P_ int fd, int ev)
60{
61 if (0 >
62 port_associate (
63 backend_fd, PORT_SOURCE_FD, fd,
64 (ev & EV_READ ? POLLIN : 0)
65 | (ev & EV_WRITE ? POLLOUT : 0),
66 0
67 )
68 )
69 {
70 if (errno == EBADFD)
71 fd_kill (EV_A_ fd);
72 else
73 ev_syserr ("(libev) port_associate");
74 }
75}
34 76
35static void 77static void
36port_modify (EV_P_ int fd, int oev, int nev) 78port_modify (EV_P_ int fd, int oev, int nev)
37{ 79{
38 /* we need to reassociate no matter what, as closes are 80 /* we need to reassociate no matter what, as closes are
39 * once more silently being discarded. 81 * once more silently being discarded.
40 */ 82 */
41 if (!nev) 83 if (!nev)
42 { 84 {
43 if (oev) 85 if (oev)
44 port_dissociate (port_fd, PORT_SOURCE_FD, fd); 86 port_dissociate (backend_fd, PORT_SOURCE_FD, fd);
45 } 87 }
46 else if (0 >
47 port_associate (
48 port_fd, PORT_SOURCE_FD, fd,
49 (nev & EV_READ ? POLLIN : 0)
50 | (nev & EV_WRITE ? POLLOUT : 0),
51 0
52 )
53 )
54 {
55 if (errno == EBADFD)
56 fd_kill (EV_A_ fd);
57 else 88 else
58 syserr ("(libev) port_associate"); 89 port_associate_and_check (EV_A_ fd, nev);
59 }
60} 90}
61 91
62static void 92static void
63port_poll (EV_P_ ev_tstamp timeout) 93port_poll (EV_P_ ev_tstamp timeout)
64{ 94{
65 int res, i; 95 int res, i;
66 struct timespec ts; 96 struct timespec ts;
67 uint_t nget = 1; 97 uint_t nget = 1;
68 98
69 ts.tv_sec = (time_t)timeout; 99 /* we initialise this to something we will skip in the loop, as */
70 ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; 100 /* port_getn can return with nget unchanged, but no indication */
71 res = port_getn (port_fd, port_events, port_eventmax, &nget, &ts); 101 /* whether it was the original value or has been updated :/ */
102 port_events [0].portev_source = 0;
72 103
73 if (res < 0) 104 EV_RELEASE_CB;
74 { 105 EV_TS_SET (ts, timeout);
75 if (errno != EINTR && errno != ETIME) 106 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
76 syserr ("(libev) port_getn"); 107 EV_ACQUIRE_CB;
77 108
78 return; 109 /* port_getn may or may not set nget on error */
79 } 110 /* so we rely on port_events [0].portev_source not being updated */
111 if (res == -1 && errno != ETIME && errno != EINTR)
112 ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
80 113
81 for (i = 0; i < nget; ++i) 114 for (i = 0; i < nget; ++i)
82 { 115 {
83 if (port_events [i].portev_source == PORT_SOURCE_FD) 116 if (port_events [i].portev_source == PORT_SOURCE_FD)
84 { 117 {
… …
89 fd, 122 fd,
90 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) 123 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
91 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) 124 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
92 ); 125 );
93 126
94 anfds [fd].events = 0; /* event received == disassociated */ 127 fd_change (EV_A_ fd, EV__IOFDSET);
95 fd_change (EV_A_ fd); /* need to reify later */
96 } 128 }
97 } 129 }
98 130
99 if (expect_false (nget == port_eventmax)) 131 if (expect_false (nget == port_eventmax))
100 { 132 {
101 ev_free (port_events); 133 ev_free (port_events);
102 port_eventmax = array_roundsize (port_event_t, port_eventmax << 1); 134 port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
103 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 135 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
104 } 136 }
105} 137}
106 138
107static int 139int inline_size
108port_init (EV_P_ int flags) 140port_init (EV_P_ int flags)
109{ 141{
110 /* Initalize the kernel queue */ 142 /* Initialize the kernel queue */
111 if ((port_fd = port_create ()) < 0) 143 if ((backend_fd = port_create ()) < 0)
112 return 0; 144 return 0;
113 145
114 fcntl (port_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ 146 assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
115 147
116 method_fudge = 1e-3; /* needed to compensate for port_getn returning early */ 148 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
117 method_modify = port_modify;
118 method_poll = port_poll;
119 149
150 backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */
151 backend_modify = port_modify;
152 backend_poll = port_poll;
153
120 port_eventmax = 64; /* intiial number of events receivable per poll */ 154 port_eventmax = 64; /* initial number of events receivable per poll */
121 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 155 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
122 156
123 return EVMETHOD_PORT; 157 return EVBACKEND_PORT;
124} 158}
125 159
126static void 160void inline_size
127port_destroy (EV_P) 161port_destroy (EV_P)
128{ 162{
129 close (port_fd);
130
131 ev_free (port_events); 163 ev_free (port_events);
132} 164}
133 165
134static void 166void inline_size
135port_fork (EV_P) 167port_fork (EV_P)
136{ 168{
137 close (port_fd); 169 close (backend_fd);
138 170
139 while ((port_fd = port_create ()) < 0) 171 while ((backend_fd = port_create ()) < 0)
140 syserr ("(libev) port"); 172 ev_syserr ("(libev) port");
141 173
142 fcntl (port_fd, F_SETFD, FD_CLOEXEC); 174 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
143 175
144 /* re-register interest in fds */ 176 /* re-register interest in fds */
145 fd_rearm_all (EV_A); 177 fd_rearm_all (EV_A);
146} 178}
147 179

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