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Comparing libev/ev_select.c (file contents):
Revision 1.28 by root, Sun Mar 16 16:38:23 2008 UTC vs.
Revision 1.54 by root, Fri Jun 3 00:04:52 2011 UTC

1/* 1/*
2 * libev select fd activity backend 2 * libev select fd activity 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 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,
… …
37 * either the BSD or the GPL. 37 * either the BSD or the GPL.
38 */ 38 */
39 39
40#ifndef _WIN32 40#ifndef _WIN32
41/* for unix systems */ 41/* for unix systems */
42# include <sys/select.h>
43# include <inttypes.h> 42# include <inttypes.h>
43# ifndef __hpux
44/* for REAL unix systems */
45# include <sys/select.h>
46# endif
44#endif 47#endif
45 48
46#ifndef EV_SELECT_USE_FD_SET 49#ifndef EV_SELECT_USE_FD_SET
47# ifdef NFDBITS 50# ifdef NFDBITS
48# define EV_SELECT_USE_FD_SET 0 51# define EV_SELECT_USE_FD_SET 0
… …
52#endif 55#endif
53 56
54#if EV_SELECT_IS_WINSOCKET 57#if EV_SELECT_IS_WINSOCKET
55# undef EV_SELECT_USE_FD_SET 58# undef EV_SELECT_USE_FD_SET
56# define EV_SELECT_USE_FD_SET 1 59# define EV_SELECT_USE_FD_SET 1
57# undef EINTR 60# undef NFDBITS
58# define EINTR WSAEINTR 61# define NFDBITS 0
59# undef EBADF
60# define EBADF WSAENOTSOCK
61# undef ENOMEM
62# define ENOMEM (errno + 1)
63#endif 62#endif
64 63
65#if !EV_SELECT_USE_FD_SET 64#if !EV_SELECT_USE_FD_SET
66# define NFDBYTES (NFDBITS / 8) 65# define NFDBYTES (NFDBITS / 8)
67#endif 66#endif
… …
81 SOCKET handle = anfds [fd].handle; 80 SOCKET handle = anfds [fd].handle;
82 #else 81 #else
83 int handle = fd; 82 int handle = fd;
84 #endif 83 #endif
85 84
85 assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE));
86
87 /* FD_SET is broken on windows (it adds the fd to a set twice or more,
88 * which eventually leads to overflows). Need to call it only on changes.
89 */
90 #if EV_SELECT_IS_WINSOCKET
91 if ((oev ^ nev) & EV_READ)
92 #endif
86 if (nev & EV_READ) 93 if (nev & EV_READ)
87 FD_SET (handle, (fd_set *)vec_ri); 94 FD_SET (handle, (fd_set *)vec_ri);
88 else 95 else
89 FD_CLR (handle, (fd_set *)vec_ri); 96 FD_CLR (handle, (fd_set *)vec_ri);
90 97
98 #if EV_SELECT_IS_WINSOCKET
99 if ((oev ^ nev) & EV_WRITE)
100 #endif
91 if (nev & EV_WRITE) 101 if (nev & EV_WRITE)
92 FD_SET (handle, (fd_set *)vec_wi); 102 FD_SET (handle, (fd_set *)vec_wi);
93 else 103 else
94 FD_CLR (handle, (fd_set *)vec_wi); 104 FD_CLR (handle, (fd_set *)vec_wi);
95 105
96#else 106#else
97 107
98 int word = fd / NFDBITS; 108 int word = fd / NFDBITS;
99 fd_mask mask = 1UL << (fd % NFDBITS); 109 fd_mask mask = 1UL << (fd % NFDBITS);
100 110
101 if (expect_false (vec_max < word + 1)) 111 if (expect_false (vec_max <= word))
102 { 112 {
103 int new_max = word + 1; 113 int new_max = word + 1;
104 114
105 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); 115 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
106 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ 116 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
107 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); 117 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
108 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ 118 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
119 #ifdef _WIN32
120 vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */
121 #endif
109 122
110 for (; vec_max < new_max; ++vec_max) 123 for (; vec_max < new_max; ++vec_max)
111 ((fd_mask *)vec_ri) [vec_max] = 124 ((fd_mask *)vec_ri) [vec_max] =
112 ((fd_mask *)vec_wi) [vec_max] = 0; 125 ((fd_mask *)vec_wi) [vec_max] = 0;
113 } 126 }
… …
126static void 139static void
127select_poll (EV_P_ ev_tstamp timeout) 140select_poll (EV_P_ ev_tstamp timeout)
128{ 141{
129 struct timeval tv; 142 struct timeval tv;
130 int res; 143 int res;
144 int fd_setsize;
145
146 EV_RELEASE_CB;
147 EV_TV_SET (tv, timeout);
131 148
132#if EV_SELECT_USE_FD_SET 149#if EV_SELECT_USE_FD_SET
150 fd_setsize = sizeof (fd_set);
151#else
152 fd_setsize = vec_max * NFDBYTES;
153#endif
154
133 memcpy (vec_ro, vec_ri, sizeof (fd_set)); 155 memcpy (vec_ro, vec_ri, fd_setsize);
134 memcpy (vec_wo, vec_wi, sizeof (fd_set)); 156 memcpy (vec_wo, vec_wi, fd_setsize);
135#else
136 memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
137 memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
138#endif
139 157
140 tv.tv_sec = (long)timeout; 158#ifdef _WIN32
141 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 159 /* pass in the write set as except set.
142 160 * the idea behind this is to work around a windows bug that causes
161 * errors to be reported as an exception and not by setting
162 * the writable bit. this is so uncontrollably lame.
163 */
164 memcpy (vec_eo, vec_wi, fd_setsize);
165 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
166#elif EV_SELECT_USE_FD_SET
167 fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
168 res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
169#else
143 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 170 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
171#endif
172 EV_ACQUIRE_CB;
144 173
145 if (expect_false (res < 0)) 174 if (expect_false (res < 0))
146 { 175 {
147 #if EV_SELECT_IS_WINSOCKET 176 #if EV_SELECT_IS_WINSOCKET
148 errno = WSAGetLastError (); 177 errno = WSAGetLastError ();
149 #endif 178 #endif
179 #ifdef WSABASEERR
180 /* on windows, select returns incompatible error codes, fix this */
181 if (errno >= WSABASEERR && errno < WSABASEERR + 1000)
182 if (errno == WSAENOTSOCK)
183 errno = EBADF;
184 else
185 errno -= WSABASEERR;
186 #endif
187
188 #ifdef _WIN32
189 /* select on windows erroneously returns EINVAL when no fd sets have been
190 * provided (this is documented). what microsoft doesn't tell you that this bug
191 * exists even when the fd sets _are_ provided, so we have to check for this bug
192 * here and emulate by sleeping manually.
193 * we also get EINVAL when the timeout is invalid, but we ignore this case here
194 * and assume that EINVAL always means: you have to wait manually.
195 */
196 if (errno == EINVAL)
197 {
198 if (timeout)
199 {
200 unsigned long ms = timeout * 1e3;
201 Sleep (ms ? ms : 1);
202 }
203
204 return;
205 }
206 #endif
150 207
151 if (errno == EBADF) 208 if (errno == EBADF)
152 fd_ebadf (EV_A); 209 fd_ebadf (EV_A);
153 else if (errno == ENOMEM && !syserr_cb) 210 else if (errno == ENOMEM && !syserr_cb)
154 fd_enomem (EV_A); 211 fd_enomem (EV_A);
155 else if (errno != EINTR) 212 else if (errno != EINTR)
156 syserr ("(libev) select"); 213 ev_syserr ("(libev) select");
157 214
158 return; 215 return;
159 } 216 }
160 217
161#if EV_SELECT_USE_FD_SET 218#if EV_SELECT_USE_FD_SET
… …
173 int handle = fd; 230 int handle = fd;
174 #endif 231 #endif
175 232
176 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; 233 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
177 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; 234 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
235 #ifdef _WIN32
236 if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE;
237 #endif
178 238
179 if (expect_true (events)) 239 if (expect_true (events))
180 fd_event (EV_A_ fd, events); 240 fd_event (EV_A_ fd, events);
181 } 241 }
182 } 242 }
… …
187 int word, bit; 247 int word, bit;
188 for (word = vec_max; word--; ) 248 for (word = vec_max; word--; )
189 { 249 {
190 fd_mask word_r = ((fd_mask *)vec_ro) [word]; 250 fd_mask word_r = ((fd_mask *)vec_ro) [word];
191 fd_mask word_w = ((fd_mask *)vec_wo) [word]; 251 fd_mask word_w = ((fd_mask *)vec_wo) [word];
252 #ifdef _WIN32
253 word_w |= ((fd_mask *)vec_eo) [word];
254 #endif
192 255
193 if (word_r || word_w) 256 if (word_r || word_w)
194 for (bit = NFDBITS; bit--; ) 257 for (bit = NFDBITS; bit--; )
195 { 258 {
196 fd_mask mask = 1UL << bit; 259 fd_mask mask = 1UL << bit;
… …
209} 272}
210 273
211int inline_size 274int inline_size
212select_init (EV_P_ int flags) 275select_init (EV_P_ int flags)
213{ 276{
214 backend_fudge = 0.; /* posix says this is zero */ 277 backend_fudge = 1e-6;
215 backend_modify = select_modify; 278 backend_modify = select_modify;
216 backend_poll = select_poll; 279 backend_poll = select_poll;
217 280
218#if EV_SELECT_USE_FD_SET 281#if EV_SELECT_USE_FD_SET
219 vec_max = FD_SETSIZE / 32;
220 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); 282 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
221 vec_ro = ev_malloc (sizeof (fd_set)); 283 vec_ro = ev_malloc (sizeof (fd_set));
222 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); 284 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
223 vec_wo = ev_malloc (sizeof (fd_set)); 285 vec_wo = ev_malloc (sizeof (fd_set));
286 #ifdef _WIN32
287 vec_eo = ev_malloc (sizeof (fd_set));
288 #endif
224#else 289#else
225 vec_max = 0; 290 vec_max = 0;
226 vec_ri = 0; 291 vec_ri = 0;
227 vec_ri = 0; 292 vec_ro = 0;
293 vec_wi = 0;
228 vec_wo = 0; 294 vec_wo = 0;
295 #ifdef _WIN32
229 vec_wo = 0; 296 vec_eo = 0;
297 #endif
230#endif 298#endif
231 299
232 return EVBACKEND_SELECT; 300 return EVBACKEND_SELECT;
233} 301}
234 302
… …
237{ 305{
238 ev_free (vec_ri); 306 ev_free (vec_ri);
239 ev_free (vec_ro); 307 ev_free (vec_ro);
240 ev_free (vec_wi); 308 ev_free (vec_wi);
241 ev_free (vec_wo); 309 ev_free (vec_wo);
310 #ifdef _WIN32
311 ev_free (vec_eo);
312 #endif
242} 313}
243 314
244

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