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Comparing libev/ev_select.c (file contents):
Revision 1.22 by root, Fri Nov 23 05:13:49 2007 UTC vs.
Revision 1.39 by root, Mon Jan 5 14:41:35 2009 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 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: 9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
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.
10 * 27 *
11 * * Redistributions of source code must retain the above copyright 28 * Alternatively, the contents of this file may be used under the terms of
12 * notice, this list of conditions and the following disclaimer. 29 * the GNU General Public License ("GPL") version 2 or any later version,
13 * 30 * in which case the provisions of the GPL are applicable instead of
14 * * Redistributions in binary form must reproduce the above 31 * the above. If you wish to allow the use of your version of this file
15 * copyright notice, this list of conditions and the following 32 * only under the terms of the GPL and not to allow others to use your
16 * disclaimer in the documentation and/or other materials provided 33 * version of this file under the BSD license, indicate your decision
17 * with the distribution. 34 * by deleting the provisions above and replace them with the notice
18 * 35 * and other provisions required by the GPL. If you do not delete the
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 * provisions above, a recipient may use your version of this file under
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 * either the BSD or the GPL.
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */ 38 */
31 39
32#ifndef _WIN32 40#ifndef _WIN32
33/* for unix systems */ 41/* for unix systems */
34# include <sys/select.h> 42# include <sys/select.h>
… …
44#endif 52#endif
45 53
46#if EV_SELECT_IS_WINSOCKET 54#if EV_SELECT_IS_WINSOCKET
47# undef EV_SELECT_USE_FD_SET 55# undef EV_SELECT_USE_FD_SET
48# define EV_SELECT_USE_FD_SET 1 56# define EV_SELECT_USE_FD_SET 1
49# undef EINTR 57# undef NFDBITS
50# define EINTR WSAEINTR 58# define NFDBITS 0
51# undef EBADF
52# define EBADF WSAENOTSOCK
53# undef ENOMEM
54# define ENOMEM (errno + 1)
55#endif 59#endif
56 60
57#if !EV_SELECT_USE_FD_SET 61#if !EV_SELECT_USE_FD_SET
58# define NFDBYTES (NFDBITS / 8) 62# define NFDBYTES (NFDBITS / 8)
59#endif 63#endif
… …
73 SOCKET handle = anfds [fd].handle; 77 SOCKET handle = anfds [fd].handle;
74 #else 78 #else
75 int handle = fd; 79 int handle = fd;
76 #endif 80 #endif
77 81
82 /* FD_SET is broken on windows (it adds the fd to a set twice or more,
83 * which eventually leads to overflows). Need to call it only on changes.
84 */
85 #if EV_SELECT_IS_WINSOCKET
86 if ((oev ^ nev) & EV_READ)
87 #endif
78 if (nev & EV_READ) 88 if (nev & EV_READ)
79 FD_SET (handle, (fd_set *)vec_ri); 89 FD_SET (handle, (fd_set *)vec_ri);
80 else 90 else
81 FD_CLR (handle, (fd_set *)vec_ri); 91 FD_CLR (handle, (fd_set *)vec_ri);
82 92
93 #if EV_SELECT_IS_WINSOCKET
94 if ((oev ^ nev) & EV_WRITE)
95 #endif
83 if (nev & EV_WRITE) 96 if (nev & EV_WRITE)
84 FD_SET (handle, (fd_set *)vec_wi); 97 FD_SET (handle, (fd_set *)vec_wi);
85 else 98 else
86 FD_CLR (handle, (fd_set *)vec_wi); 99 FD_CLR (handle, (fd_set *)vec_wi);
87 100
88#else 101#else
89 102
90 int word = fd / NFDBITS; 103 int word = fd / NFDBITS;
91 int mask = 1UL << (fd % NFDBITS); 104 fd_mask mask = 1UL << (fd % NFDBITS);
92 105
93 if (vec_max < word + 1) 106 if (expect_false (vec_max <= word))
94 { 107 {
95 int new_max = word + 1; 108 int new_max = word + 1;
96 109
97 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); 110 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
98 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ 111 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
99 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); 112 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
100 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ 113 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
114 #ifdef _WIN32
115 vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */
116 #endif
101 117
102 for (; vec_max < new_max; ++vec_max) 118 for (; vec_max < new_max; ++vec_max)
103 ((fd_mask *)vec_ri)[vec_max] = 119 ((fd_mask *)vec_ri) [vec_max] =
104 ((fd_mask *)vec_wi)[vec_max] = 0; 120 ((fd_mask *)vec_wi) [vec_max] = 0;
105 } 121 }
106 122
107 ((fd_mask *)vec_ri) [word] |= mask; 123 ((fd_mask *)vec_ri) [word] |= mask;
108 if (!(nev & EV_READ)) 124 if (!(nev & EV_READ))
109 ((fd_mask *)vec_ri) [word] &= ~mask; 125 ((fd_mask *)vec_ri) [word] &= ~mask;
… …
118static void 134static void
119select_poll (EV_P_ ev_tstamp timeout) 135select_poll (EV_P_ ev_tstamp timeout)
120{ 136{
121 struct timeval tv; 137 struct timeval tv;
122 int res; 138 int res;
123 139 int fd_setsize;
124#if EV_SELECT_USE_FD_SET
125 memcpy (vec_ro, vec_ri, sizeof (fd_set));
126 memcpy (vec_wo, vec_wi, sizeof (fd_set));
127#else
128 memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
129 memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
130#endif
131 140
132 tv.tv_sec = (long)timeout; 141 tv.tv_sec = (long)timeout;
133 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 142 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
134 143
144#if EV_SELECT_USE_FD_SET
145 fd_setsize = sizeof (fd_set);
146#else
147 fd_setsize = vec_max * NFDBYTES;
148#endif
149
150 memcpy (vec_ro, vec_ri, fd_setsize);
151 memcpy (vec_wo, vec_wi, fd_setsize);
152
153#ifdef _WIN32
154 /* pass in the write set as except set.
155 * the idea behind this is to work around a windows bug that causes
156 * errors to be reported as an exception and not by setting
157 * the writable bit. this is so uncontrollably lame.
158 */
159 memcpy (vec_eo, vec_wi, fd_setsize);
160 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
161#else
135 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 162 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
163#endif
136 164
137 if (res < 0) 165 if (expect_false (res < 0))
138 { 166 {
139 #if EV_SELECT_IS_WINSOCKET 167 #if EV_SELECT_IS_WINSOCKET
140 errno = WSAGetLastError (); 168 errno = WSAGetLastError ();
169 #endif
170 #ifdef WSABASEERR
171 /* on windows, select returns incompatible error codes, fix this */
172 if (errno >= WSABASEERR && errno < WSABASEERR + 1000)
173 if (errno == WSAENOTSOCK)
174 errno = EBADF;
175 else
176 errno -= WSABASEERR;
177 #endif
178
179 #ifdef _WIN32
180 /* select on windows errornously returns EINVAL when no fd sets have been
181 * provided (this is documented). what microsoft doesn't tell you that this bug
182 * exists even when the fd sets _are_ provided, so we have to check for this bug
183 * here and emulate by sleeping manually.
184 * we also get EINVAL when the timeout is invalid, but we ignore this case here
185 * and assume that EINVAL always means: you have to wait manually.
186 */
187 if (errno == EINVAL)
188 {
189 ev_sleep (timeout);
190 return;
191 }
141 #endif 192 #endif
142 193
143 if (errno == EBADF) 194 if (errno == EBADF)
144 fd_ebadf (EV_A); 195 fd_ebadf (EV_A);
145 else if (errno == ENOMEM && !syserr_cb) 196 else if (errno == ENOMEM && !syserr_cb)
146 fd_enomem (EV_A); 197 fd_enomem (EV_A);
147 else if (errno != EINTR) 198 else if (errno != EINTR)
148 syserr ("(libev) select"); 199 ev_syserr ("(libev) select");
149 200
150 return; 201 return;
151 } 202 }
152 203
153#if EV_SELECT_USE_FD_SET 204#if EV_SELECT_USE_FD_SET
… …
165 int handle = fd; 216 int handle = fd;
166 #endif 217 #endif
167 218
168 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; 219 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
169 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; 220 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
221 #ifdef _WIN32
222 if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE;
223 #endif
170 224
171 if (events) 225 if (expect_true (events))
172 fd_event (EV_A_ fd, events); 226 fd_event (EV_A_ fd, events);
173 } 227 }
174 } 228 }
175 229
176#else 230#else
… …
179 int word, bit; 233 int word, bit;
180 for (word = vec_max; word--; ) 234 for (word = vec_max; word--; )
181 { 235 {
182 fd_mask word_r = ((fd_mask *)vec_ro) [word]; 236 fd_mask word_r = ((fd_mask *)vec_ro) [word];
183 fd_mask word_w = ((fd_mask *)vec_wo) [word]; 237 fd_mask word_w = ((fd_mask *)vec_wo) [word];
238 #ifdef _WIN32
239 word_w |= ((fd_mask *)vec_eo) [word];
240 #endif
184 241
185 if (word_r || word_w) 242 if (word_r || word_w)
186 for (bit = NFDBITS; bit--; ) 243 for (bit = NFDBITS; bit--; )
187 { 244 {
188 fd_mask mask = 1UL << bit; 245 fd_mask mask = 1UL << bit;
189 int events = 0; 246 int events = 0;
190 247
191 events |= word_r & mask ? EV_READ : 0; 248 events |= word_r & mask ? EV_READ : 0;
192 events |= word_w & mask ? EV_WRITE : 0; 249 events |= word_w & mask ? EV_WRITE : 0;
193 250
194 if (events) 251 if (expect_true (events))
195 fd_event (EV_A_ word * NFDBITS + bit, events); 252 fd_event (EV_A_ word * NFDBITS + bit, events);
196 } 253 }
197 } 254 }
198 } 255 }
199 256
200#endif 257#endif
201} 258}
202 259
203static int 260int inline_size
204select_init (EV_P_ int flags) 261select_init (EV_P_ int flags)
205{ 262{
206 backend_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 263 backend_fudge = 0.; /* posix says this is zero */
207 backend_modify = select_modify; 264 backend_modify = select_modify;
208 backend_poll = select_poll; 265 backend_poll = select_poll;
209 266
210#if EV_SELECT_USE_FD_SET 267#if EV_SELECT_USE_FD_SET
211 vec_max = FD_SETSIZE / 32; 268 vec_max = FD_SETSIZE / 32;
212 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); 269 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
213 vec_ro = ev_malloc (sizeof (fd_set)); 270 vec_ro = ev_malloc (sizeof (fd_set));
214 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); 271 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
215 vec_wo = ev_malloc (sizeof (fd_set)); 272 vec_wo = ev_malloc (sizeof (fd_set));
273 #ifdef _WIN32
274 vec_eo = ev_malloc (sizeof (fd_set));
275 #endif
216#else 276#else
217 vec_max = 0; 277 vec_max = 0;
218 vec_ri = 0; 278 vec_ri = 0;
219 vec_ri = 0; 279 vec_ri = 0;
220 vec_wo = 0; 280 vec_wo = 0;
… …
222#endif 282#endif
223 283
224 return EVBACKEND_SELECT; 284 return EVBACKEND_SELECT;
225} 285}
226 286
227static void 287void inline_size
228select_destroy (EV_P) 288select_destroy (EV_P)
229{ 289{
230 ev_free (vec_ri); 290 ev_free (vec_ri);
231 ev_free (vec_ro); 291 ev_free (vec_ro);
232 ev_free (vec_wi); 292 ev_free (vec_wi);

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