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Comparing libev/ev_select.c (file contents):
Revision 1.31 by root, Fri May 23 16:37:38 2008 UTC vs.
Revision 1.49 by root, Sat Oct 16 06:46:55 2010 UTC

1/* 1/*
2 * libev select fd activity backend 2 * libev select fd activity backend
3 * 3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010 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 *
… …
52#endif 52#endif
53 53
54#if EV_SELECT_IS_WINSOCKET 54#if EV_SELECT_IS_WINSOCKET
55# undef EV_SELECT_USE_FD_SET 55# undef EV_SELECT_USE_FD_SET
56# define EV_SELECT_USE_FD_SET 1 56# define EV_SELECT_USE_FD_SET 1
57# undef NFDBITS
58# define NFDBITS 0
57#endif 59#endif
58 60
59#if !EV_SELECT_USE_FD_SET 61#if !EV_SELECT_USE_FD_SET
60# define NFDBYTES (NFDBITS / 8) 62# define NFDBYTES (NFDBITS / 8)
61#endif 63#endif
… …
75 SOCKET handle = anfds [fd].handle; 77 SOCKET handle = anfds [fd].handle;
76 #else 78 #else
77 int handle = fd; 79 int handle = fd;
78 #endif 80 #endif
79 81
82 assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE));
83
84 /* FD_SET is broken on windows (it adds the fd to a set twice or more,
85 * which eventually leads to overflows). Need to call it only on changes.
86 */
87 #if EV_SELECT_IS_WINSOCKET
88 if ((oev ^ nev) & EV_READ)
89 #endif
80 if (nev & EV_READ) 90 if (nev & EV_READ)
81 FD_SET (handle, (fd_set *)vec_ri); 91 FD_SET (handle, (fd_set *)vec_ri);
82 else 92 else
83 FD_CLR (handle, (fd_set *)vec_ri); 93 FD_CLR (handle, (fd_set *)vec_ri);
84 94
95 #if EV_SELECT_IS_WINSOCKET
96 if ((oev ^ nev) & EV_WRITE)
97 #endif
85 if (nev & EV_WRITE) 98 if (nev & EV_WRITE)
86 FD_SET (handle, (fd_set *)vec_wi); 99 FD_SET (handle, (fd_set *)vec_wi);
87 else 100 else
88 FD_CLR (handle, (fd_set *)vec_wi); 101 FD_CLR (handle, (fd_set *)vec_wi);
89 102
90#else 103#else
91 104
92 int word = fd / NFDBITS; 105 int word = fd / NFDBITS;
93 fd_mask mask = 1UL << (fd % NFDBITS); 106 fd_mask mask = 1UL << (fd % NFDBITS);
… …
98 111
99 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); 112 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
100 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ 113 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
101 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); 114 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
102 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ 115 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
116 #ifdef _WIN32
117 vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */
118 #endif
103 119
104 for (; vec_max < new_max; ++vec_max) 120 for (; vec_max < new_max; ++vec_max)
105 ((fd_mask *)vec_ri) [vec_max] = 121 ((fd_mask *)vec_ri) [vec_max] =
106 ((fd_mask *)vec_wi) [vec_max] = 0; 122 ((fd_mask *)vec_wi) [vec_max] = 0;
107 } 123 }
… …
120static void 136static void
121select_poll (EV_P_ ev_tstamp timeout) 137select_poll (EV_P_ ev_tstamp timeout)
122{ 138{
123 struct timeval tv; 139 struct timeval tv;
124 int res; 140 int res;
141 int fd_setsize;
142
143 EV_RELEASE_CB;
144 EV_TV_SET (tv, timeout);
125 145
126#if EV_SELECT_USE_FD_SET 146#if EV_SELECT_USE_FD_SET
147 fd_setsize = sizeof (fd_set);
148#else
149 fd_setsize = vec_max * NFDBYTES;
150#endif
151
127 memcpy (vec_ro, vec_ri, sizeof (fd_set)); 152 memcpy (vec_ro, vec_ri, fd_setsize);
128 memcpy (vec_wo, vec_wi, sizeof (fd_set)); 153 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
133 154
134 tv.tv_sec = (long)timeout; 155#ifdef _WIN32
135 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 156 /* pass in the write set as except set.
136 157 * the idea behind this is to work around a windows bug that causes
158 * errors to be reported as an exception and not by setting
159 * the writable bit. this is so uncontrollably lame.
160 */
161 memcpy (vec_eo, vec_wi, fd_setsize);
162 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
163#elif EV_SELECT_USE_FD_SET
164 fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
165 res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
166#else
137 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 167 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
168#endif
169 EV_ACQUIRE_CB;
138 170
139 if (expect_false (res < 0)) 171 if (expect_false (res < 0))
140 { 172 {
141 #if EV_SELECT_IS_WINSOCKET 173 #if EV_SELECT_IS_WINSOCKET
142 errno = WSAGetLastError (); 174 errno = WSAGetLastError ();
… …
149 else 181 else
150 errno -= WSABASEERR; 182 errno -= WSABASEERR;
151 #endif 183 #endif
152 184
153 #ifdef _WIN32 185 #ifdef _WIN32
154 /* select on windows errornously returns EINVAL when no fd sets have been 186 /* 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 187 * 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 188 * exists even when the fd sets _are_ provided, so we have to check for this bug
157 * here and emulate by sleeping manually. 189 * here and emulate by sleeping manually.
158 * we also get EINVAL when the timeout is invalid, but we ignore this case here 190 * 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. 191 * and assume that EINVAL always means: you have to wait manually.
160 */ 192 */
161 if (errno == EINVAL) 193 if (errno == EINVAL)
… …
168 if (errno == EBADF) 200 if (errno == EBADF)
169 fd_ebadf (EV_A); 201 fd_ebadf (EV_A);
170 else if (errno == ENOMEM && !syserr_cb) 202 else if (errno == ENOMEM && !syserr_cb)
171 fd_enomem (EV_A); 203 fd_enomem (EV_A);
172 else if (errno != EINTR) 204 else if (errno != EINTR)
173 syserr ("(libev) select"); 205 ev_syserr ("(libev) select");
174 206
175 return; 207 return;
176 } 208 }
177 209
178#if EV_SELECT_USE_FD_SET 210#if EV_SELECT_USE_FD_SET
… …
190 int handle = fd; 222 int handle = fd;
191 #endif 223 #endif
192 224
193 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; 225 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
194 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; 226 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
227 #ifdef _WIN32
228 if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE;
229 #endif
195 230
196 if (expect_true (events)) 231 if (expect_true (events))
197 fd_event (EV_A_ fd, events); 232 fd_event (EV_A_ fd, events);
198 } 233 }
199 } 234 }
… …
204 int word, bit; 239 int word, bit;
205 for (word = vec_max; word--; ) 240 for (word = vec_max; word--; )
206 { 241 {
207 fd_mask word_r = ((fd_mask *)vec_ro) [word]; 242 fd_mask word_r = ((fd_mask *)vec_ro) [word];
208 fd_mask word_w = ((fd_mask *)vec_wo) [word]; 243 fd_mask word_w = ((fd_mask *)vec_wo) [word];
244 #ifdef _WIN32
245 word_w |= ((fd_mask *)vec_eo) [word];
246 #endif
209 247
210 if (word_r || word_w) 248 if (word_r || word_w)
211 for (bit = NFDBITS; bit--; ) 249 for (bit = NFDBITS; bit--; )
212 { 250 {
213 fd_mask mask = 1UL << bit; 251 fd_mask mask = 1UL << bit;
… …
231 backend_fudge = 0.; /* posix says this is zero */ 269 backend_fudge = 0.; /* posix says this is zero */
232 backend_modify = select_modify; 270 backend_modify = select_modify;
233 backend_poll = select_poll; 271 backend_poll = select_poll;
234 272
235#if EV_SELECT_USE_FD_SET 273#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); 274 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
238 vec_ro = ev_malloc (sizeof (fd_set)); 275 vec_ro = ev_malloc (sizeof (fd_set));
239 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); 276 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
240 vec_wo = ev_malloc (sizeof (fd_set)); 277 vec_wo = ev_malloc (sizeof (fd_set));
278 #ifdef _WIN32
279 vec_eo = ev_malloc (sizeof (fd_set));
280 #endif
241#else 281#else
242 vec_max = 0; 282 vec_max = 0;
243 vec_ri = 0; 283 vec_ri = 0;
244 vec_ri = 0; 284 vec_ro = 0;
285 vec_wi = 0;
245 vec_wo = 0; 286 vec_wo = 0;
287 #ifdef _WIN32
246 vec_wo = 0; 288 vec_eo = 0;
289 #endif
247#endif 290#endif
248 291
249 return EVBACKEND_SELECT; 292 return EVBACKEND_SELECT;
250} 293}
251 294
… …
254{ 297{
255 ev_free (vec_ri); 298 ev_free (vec_ri);
256 ev_free (vec_ro); 299 ev_free (vec_ro);
257 ev_free (vec_wi); 300 ev_free (vec_wi);
258 ev_free (vec_wo); 301 ev_free (vec_wo);
302 #ifdef _WIN32
303 ev_free (vec_eo);
304 #endif
259} 305}
260 306
261 307

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