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

Comparing libev/ev_port.c (file contents):
Revision 1.7 by root, Wed Nov 28 11:15:55 2007 UTC vs.
Revision 1.29 by root, Thu Feb 18 04:48:05 2016 UTC

1/* 1/*
2 * libev solaris event port backend 2 * libev solaris event port backend
3 * 3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * modification, are permitted provided that the following conditions are 8 * tion, are permitted provided that the following conditions are met:
9 * met:
10 * 9 *
11 * * Redistributions of source code must retain the above copyright 10 * 1. Redistributions of source code must retain the above copyright notice,
12 * notice, this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
13 * 12 *
14 * * Redistributions in binary form must reproduce the above 13 * 2. Redistributions in binary form must reproduce the above copyright
15 * copyright notice, this list of conditions and the following 14 * notice, this list of conditions and the following disclaimer in the
16 * disclaimer in the documentation and/or other materials provided 15 * documentation and/or other materials provided with the distribution.
17 * with the distribution.
18 * 16 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
29 * OF 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.
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)
30 */ 49 */
31 50
32#include <sys/types.h> 51#include <sys/types.h>
33#include <sys/time.h> 52#include <sys/time.h>
34#include <poll.h> 53#include <poll.h>
35#include <port.h> 54#include <port.h>
36#include <string.h> 55#include <string.h>
37#include <errno.h> 56#include <errno.h>
57
58inline_speed
59void
60port_associate_and_check (EV_P_ int fd, int ev)
61{
62 if (0 >
63 port_associate (
64 backend_fd, PORT_SOURCE_FD, fd,
65 (ev & EV_READ ? POLLIN : 0)
66 | (ev & EV_WRITE ? POLLOUT : 0),
67 0
68 )
69 )
70 {
71 if (errno == EBADFD)
72 fd_kill (EV_A_ fd);
73 else
74 ev_syserr ("(libev) port_associate");
75 }
76}
38 77
39static void 78static void
40port_modify (EV_P_ int fd, int oev, int nev) 79port_modify (EV_P_ int fd, int oev, int nev)
41{ 80{
42 /* we need to reassociate no matter what, as closes are 81 /* we need to reassociate no matter what, as closes are
… …
45 if (!nev) 84 if (!nev)
46 { 85 {
47 if (oev) 86 if (oev)
48 port_dissociate (backend_fd, PORT_SOURCE_FD, fd); 87 port_dissociate (backend_fd, PORT_SOURCE_FD, fd);
49 } 88 }
50 else if (0 >
51 port_associate (
52 backend_fd, PORT_SOURCE_FD, fd,
53 (nev & EV_READ ? POLLIN : 0)
54 | (nev & EV_WRITE ? POLLOUT : 0),
55 0
56 )
57 )
58 {
59 if (errno == EBADFD)
60 fd_kill (EV_A_ fd);
61 else 89 else
62 syserr ("(libev) port_associate"); 90 port_associate_and_check (EV_A_ fd, nev);
63 }
64} 91}
65 92
66static void 93static void
67port_poll (EV_P_ ev_tstamp timeout) 94port_poll (EV_P_ ev_tstamp timeout)
68{ 95{
69 int res, i; 96 int res, i;
70 struct timespec ts; 97 struct timespec ts;
71 uint_t nget = 1; 98 uint_t nget = 1;
72 99
73 ts.tv_sec = (time_t)timeout; 100 /* we initialise this to something we will skip in the loop, as */
74 ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; 101 /* port_getn can return with nget unchanged, but no indication */
102 /* whether it was the original value or has been updated :/ */
103 port_events [0].portev_source = 0;
104
105 EV_RELEASE_CB;
106 EV_TS_SET (ts, timeout);
75 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); 107 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
108 EV_ACQUIRE_CB;
76 109
77 if (res < 0) 110 /* port_getn may or may not set nget on error */
78 { 111 /* so we rely on port_events [0].portev_source not being updated */
79 if (errno != EINTR && errno != ETIME) 112 if (res == -1 && errno != ETIME && errno != EINTR)
80 syserr ("(libev) port_getn"); 113 ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
81
82 return;
83 }
84 114
85 for (i = 0; i < nget; ++i) 115 for (i = 0; i < nget; ++i)
86 { 116 {
87 if (port_events [i].portev_source == PORT_SOURCE_FD) 117 if (port_events [i].portev_source == PORT_SOURCE_FD)
88 { 118 {
… …
93 fd, 123 fd,
94 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) 124 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
95 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) 125 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
96 ); 126 );
97 127
98 anfds [fd].events = 0; /* event received == disassociated */ 128 fd_change (EV_A_ fd, EV__IOFDSET);
99 fd_change (EV_A_ fd); /* need to reify later */
100 } 129 }
101 } 130 }
102 131
103 if (expect_false (nget == port_eventmax)) 132 if (expect_false (nget == port_eventmax))
104 { 133 {
105 ev_free (port_events); 134 ev_free (port_events);
106 port_eventmax = array_roundsize (port_event_t, port_eventmax << 1); 135 port_eventmax = array_nextsize (sizeof (port_event_t), port_eventmax, port_eventmax + 1);
107 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 136 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
108 } 137 }
109} 138}
110 139
111int inline_size 140inline_size
141int
112port_init (EV_P_ int flags) 142port_init (EV_P_ int flags)
113{ 143{
114 /* Initalize the kernel queue */ 144 /* Initialize the kernel queue */
115 if ((backend_fd = port_create ()) < 0) 145 if ((backend_fd = port_create ()) < 0)
116 return 0; 146 return 0;
117 147
148 assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
149
118 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ 150 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
119 151
152 /* if my reading of the opensolaris kernel sources are correct, then
153 * opensolaris does something very stupid: it checks if the time has already
154 * elapsed and doesn't round up if that is the case,m otherwise it DOES round
155 * up. Since we can't know what the case is, we need to guess by using a
156 * "large enough" timeout. Normally, 1e-9 would be correct.
157 */
120 backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */ 158 backend_mintime = 1e-3; /* needed to compensate for port_getn returning early */
121 backend_modify = port_modify; 159 backend_modify = port_modify;
122 backend_poll = port_poll; 160 backend_poll = port_poll;
123 161
124 port_eventmax = 64; /* intiial number of events receivable per poll */ 162 port_eventmax = 64; /* initial number of events receivable per poll */
125 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 163 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
126 164
127 return EVBACKEND_PORT; 165 return EVBACKEND_PORT;
128} 166}
129 167
130void inline_size 168inline_size
169void
131port_destroy (EV_P) 170port_destroy (EV_P)
132{ 171{
133 ev_free (port_events); 172 ev_free (port_events);
134} 173}
135 174
136void inline_size 175inline_size
176void
137port_fork (EV_P) 177port_fork (EV_P)
138{ 178{
139 close (backend_fd); 179 close (backend_fd);
140 180
141 while ((backend_fd = port_create ()) < 0) 181 while ((backend_fd = port_create ()) < 0)
142 syserr ("(libev) port"); 182 ev_syserr ("(libev) port");
143 183
144 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); 184 fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
145 185
146 /* re-register interest in fds */ 186 /* re-register interest in fds */
147 fd_rearm_all (EV_A); 187 fd_rearm_all (EV_A);

Diff Legend

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