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Comparing libev/ev_port.c (file contents):
Revision 1.12 by root, Wed Oct 29 06:32:48 2008 UTC vs.
Revision 1.27 by root, Fri Jun 3 00:04:52 2011 UTC

1/* 1/*
2 * libev solaris event port backend 2 * libev solaris event port backend
3 * 3 *
4 * Copyright (c) 2007,2008 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 modifica- 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 8 * tion, are permitted provided that the following conditions are met:
9 * 9 *
10 * 1. Redistributions of source code must retain the above copyright notice, 10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
12 * 12 *
13 * 2. Redistributions in binary form must reproduce the above copyright 13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the 14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution. 15 * documentation and/or other materials provided with the distribution.
16 * 16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 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- 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 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- 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
… …
33 * version of this file under the BSD license, indicate your decision 33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice 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 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 36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL. 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)
38 */ 49 */
39 50
40#include <sys/types.h> 51#include <sys/types.h>
41#include <sys/time.h> 52#include <sys/time.h>
42#include <poll.h> 53#include <poll.h>
… …
83{ 94{
84 int res, i; 95 int res, i;
85 struct timespec ts; 96 struct timespec ts;
86 uint_t nget = 1; 97 uint_t nget = 1;
87 98
88 ts.tv_sec = (time_t)timeout; 99 /* we initialise this to something we will skip in the loop, as */
89 ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; 100 /* port_getn can return with nget unchanged, but no indication */
101 /* whether it was the original value or has been updated :/ */
102 port_events [0].portev_source = 0;
103
104 EV_RELEASE_CB;
105 EV_TS_SET (ts, timeout);
90 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts); 106 res = port_getn (backend_fd, port_events, port_eventmax, &nget, &ts);
107 EV_ACQUIRE_CB;
91 108
92 if (res < 0) 109 /* port_getn may or may not set nget on error */
93 { 110 /* so we rely on port_events [0].portev_source not being updated */
94 if (errno != EINTR && errno != ETIME) 111 if (res == -1 && errno != ETIME && errno != EINTR)
95 ev_syserr ("(libev) port_getn"); 112 ev_syserr ("(libev) port_getn (see http://bugs.opensolaris.org/view_bug.do?bug_id=6268715, try LIBEV_FLAGS=3 env variable)");
96
97 return;
98 }
99 113
100 for (i = 0; i < nget; ++i) 114 for (i = 0; i < nget; ++i)
101 { 115 {
102 if (port_events [i].portev_source == PORT_SOURCE_FD) 116 if (port_events [i].portev_source == PORT_SOURCE_FD)
103 { 117 {
… …
108 fd, 122 fd,
109 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) 123 (port_events [i].portev_events & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
110 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) 124 | (port_events [i].portev_events & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
111 ); 125 );
112 126
113 port_associate_and_check (EV_A_ fd, anfds [fd].events); 127 fd_change (EV_A_ fd, EV__IOFDSET);
114 } 128 }
115 } 129 }
116 130
117 if (expect_false (nget == port_eventmax)) 131 if (expect_false (nget == port_eventmax))
118 { 132 {
… …
123} 137}
124 138
125int inline_size 139int inline_size
126port_init (EV_P_ int flags) 140port_init (EV_P_ int flags)
127{ 141{
128 /* Initalize the kernel queue */ 142 /* Initialize the kernel queue */
129 if ((backend_fd = port_create ()) < 0) 143 if ((backend_fd = port_create ()) < 0)
130 return 0; 144 return 0;
131 145
146 assert (("libev: PORT_SOURCE_FD must not be zero", PORT_SOURCE_FD));
147
132 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ 148 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
133 149
150 /* if my reading of the opensolaris kernel sources are correct, then
151 * opensolaris does something very stupid: it checks if the time has already
152 * elapsed and doesn't round up if that is the case,m otherwise it DOES round
153 * up. Since we can't know what the case is, we need to guess by using a
154 * "large enough" timeout. Normally, 1e-9 would be correct.
155 */
134 backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */ 156 backend_fudge = 1e-3; /* needed to compensate for port_getn returning early */
135 backend_modify = port_modify; 157 backend_modify = port_modify;
136 backend_poll = port_poll; 158 backend_poll = port_poll;
137 159
138 port_eventmax = 64; /* intiial number of events receivable per poll */ 160 port_eventmax = 64; /* initial number of events receivable per poll */
139 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax); 161 port_events = (port_event_t *)ev_malloc (sizeof (port_event_t) * port_eventmax);
140 162
141 return EVBACKEND_PORT; 163 return EVBACKEND_PORT;
142} 164}
143 165

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