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Comparing libev/ev_select.c (file contents):
Revision 1.30 by root, Thu May 22 14:05:14 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
60# undef NFDBITS
61# define NFDBITS 0
57#endif 62#endif
58 63
59#if !EV_SELECT_USE_FD_SET 64#if !EV_SELECT_USE_FD_SET
60# define NFDBYTES (NFDBITS / 8) 65# define NFDBYTES (NFDBITS / 8)
61#endif 66#endif
… …
75 SOCKET handle = anfds [fd].handle; 80 SOCKET handle = anfds [fd].handle;
76 #else 81 #else
77 int handle = fd; 82 int handle = fd;
78 #endif 83 #endif
79 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
80 if (nev & EV_READ) 93 if (nev & EV_READ)
81 FD_SET (handle, (fd_set *)vec_ri); 94 FD_SET (handle, (fd_set *)vec_ri);
82 else 95 else
83 FD_CLR (handle, (fd_set *)vec_ri); 96 FD_CLR (handle, (fd_set *)vec_ri);
84 97
98 #if EV_SELECT_IS_WINSOCKET
99 if ((oev ^ nev) & EV_WRITE)
100 #endif
85 if (nev & EV_WRITE) 101 if (nev & EV_WRITE)
86 FD_SET (handle, (fd_set *)vec_wi); 102 FD_SET (handle, (fd_set *)vec_wi);
87 else 103 else
88 FD_CLR (handle, (fd_set *)vec_wi); 104 FD_CLR (handle, (fd_set *)vec_wi);
89 105
90#else 106#else
91 107
92 int word = fd / NFDBITS; 108 int word = fd / NFDBITS;
93 fd_mask mask = 1UL << (fd % NFDBITS); 109 fd_mask mask = 1UL << (fd % NFDBITS);
… …
98 114
99 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); 115 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
100 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 */
101 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); 117 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
102 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
103 122
104 for (; vec_max < new_max; ++vec_max) 123 for (; vec_max < new_max; ++vec_max)
105 ((fd_mask *)vec_ri) [vec_max] = 124 ((fd_mask *)vec_ri) [vec_max] =
106 ((fd_mask *)vec_wi) [vec_max] = 0; 125 ((fd_mask *)vec_wi) [vec_max] = 0;
107 } 126 }
… …
120static void 139static void
121select_poll (EV_P_ ev_tstamp timeout) 140select_poll (EV_P_ ev_tstamp timeout)
122{ 141{
123 struct timeval tv; 142 struct timeval tv;
124 int res; 143 int res;
144 int fd_setsize;
145
146 EV_RELEASE_CB;
147 EV_TV_SET (tv, timeout);
125 148
126#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
127 memcpy (vec_ro, vec_ri, sizeof (fd_set)); 155 memcpy (vec_ro, vec_ri, fd_setsize);
128 memcpy (vec_wo, vec_wi, sizeof (fd_set)); 156 memcpy (vec_wo, vec_wi, fd_setsize);
129#else
130 memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
131 memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
132#endif
133 157
134 tv.tv_sec = (long)timeout; 158#ifdef _WIN32
135 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 159 /* pass in the write set as except set.
136 160 * 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
137 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;
138 173
139 if (expect_false (res < 0)) 174 if (expect_false (res < 0))
140 { 175 {
141 #if EV_SELECT_IS_WINSOCKET 176 #if EV_SELECT_IS_WINSOCKET
142 errno = WSAGetLastError (); 177 errno = WSAGetLastError ();
… …
149 else 184 else
150 errno -= WSABASEERR; 185 errno -= WSABASEERR;
151 #endif 186 #endif
152 187
153 #ifdef _WIN32 188 #ifdef _WIN32
154 /* select on windows errornously returns EINVAL when no fd sets have been 189 /* select on windows erroneously returns EINVAL when no fd sets have been
155 * provided (this is documented). what microsoft doesn't tell you that this bug 190 * provided (this is documented). what microsoft doesn't tell you that this bug
156 * exists even when the fd sets are provided, so we have to check for this bug 191 * exists even when the fd sets _are_ provided, so we have to check for this bug
157 * here and emulate by sleeping manually. 192 * here and emulate by sleeping manually.
158 * we also get EINVAL when the timeout is invalid, but we ignore this case here 193 * we also get EINVAL when the timeout is invalid, but we ignore this case here
159 * and assume that EINVAL always means: you have to wait manually. 194 * and assume that EINVAL always means: you have to wait manually.
160 */ 195 */
161 if (errno == EINVAL) 196 if (errno == EINVAL)
162 { 197 {
163 ev_sleep (timeout); 198 if (timeout)
199 {
200 unsigned long ms = timeout * 1e3;
201 Sleep (ms ? ms : 1);
202 }
203
164 return; 204 return;
165 } 205 }
166 #endif 206 #endif
167 207
168 if (errno == EBADF) 208 if (errno == EBADF)
169 fd_ebadf (EV_A); 209 fd_ebadf (EV_A);
170 else if (errno == ENOMEM && !syserr_cb) 210 else if (errno == ENOMEM && !syserr_cb)
171 fd_enomem (EV_A); 211 fd_enomem (EV_A);
172 else if (errno != EINTR) 212 else if (errno != EINTR)
173 syserr ("(libev) select"); 213 ev_syserr ("(libev) select");
174 214
175 return; 215 return;
176 } 216 }
177 217
178#if EV_SELECT_USE_FD_SET 218#if EV_SELECT_USE_FD_SET
… …
190 int handle = fd; 230 int handle = fd;
191 #endif 231 #endif
192 232
193 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; 233 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
194 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
195 238
196 if (expect_true (events)) 239 if (expect_true (events))
197 fd_event (EV_A_ fd, events); 240 fd_event (EV_A_ fd, events);
198 } 241 }
199 } 242 }
… …
204 int word, bit; 247 int word, bit;
205 for (word = vec_max; word--; ) 248 for (word = vec_max; word--; )
206 { 249 {
207 fd_mask word_r = ((fd_mask *)vec_ro) [word]; 250 fd_mask word_r = ((fd_mask *)vec_ro) [word];
208 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
209 255
210 if (word_r || word_w) 256 if (word_r || word_w)
211 for (bit = NFDBITS; bit--; ) 257 for (bit = NFDBITS; bit--; )
212 { 258 {
213 fd_mask mask = 1UL << bit; 259 fd_mask mask = 1UL << bit;
… …
226} 272}
227 273
228int inline_size 274int inline_size
229select_init (EV_P_ int flags) 275select_init (EV_P_ int flags)
230{ 276{
231 backend_fudge = 0.; /* posix says this is zero */ 277 backend_fudge = 1e-6;
232 backend_modify = select_modify; 278 backend_modify = select_modify;
233 backend_poll = select_poll; 279 backend_poll = select_poll;
234 280
235#if EV_SELECT_USE_FD_SET 281#if EV_SELECT_USE_FD_SET
236 vec_max = FD_SETSIZE / 32;
237 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);
238 vec_ro = ev_malloc (sizeof (fd_set)); 283 vec_ro = ev_malloc (sizeof (fd_set));
239 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);
240 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
241#else 289#else
242 vec_max = 0; 290 vec_max = 0;
243 vec_ri = 0; 291 vec_ri = 0;
244 vec_ri = 0; 292 vec_ro = 0;
293 vec_wi = 0;
245 vec_wo = 0; 294 vec_wo = 0;
295 #ifdef _WIN32
246 vec_wo = 0; 296 vec_eo = 0;
297 #endif
247#endif 298#endif
248 299
249 return EVBACKEND_SELECT; 300 return EVBACKEND_SELECT;
250} 301}
251 302
… …
254{ 305{
255 ev_free (vec_ri); 306 ev_free (vec_ri);
256 ev_free (vec_ro); 307 ev_free (vec_ro);
257 ev_free (vec_wi); 308 ev_free (vec_wi);
258 ev_free (vec_wo); 309 ev_free (vec_wo);
310 #ifdef _WIN32
311 ev_free (vec_eo);
312 #endif
259} 313}
260 314
261

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