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Comparing libev/ev_select.c (file contents):
Revision 1.36 by root, Wed Jun 4 07:42:58 2008 UTC vs.
Revision 1.46 by root, Sun Jul 19 04:06:13 2009 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 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 *
… …
77 SOCKET handle = anfds [fd].handle; 77 SOCKET handle = anfds [fd].handle;
78 #else 78 #else
79 int handle = fd; 79 int handle = fd;
80 #endif 80 #endif
81 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
82 if (nev & EV_READ) 90 if (nev & EV_READ)
83 FD_SET (handle, (fd_set *)vec_ri); 91 FD_SET (handle, (fd_set *)vec_ri);
84 else 92 else
85 FD_CLR (handle, (fd_set *)vec_ri); 93 FD_CLR (handle, (fd_set *)vec_ri);
86 94
95 #if EV_SELECT_IS_WINSOCKET
96 if ((oev ^ nev) & EV_WRITE)
97 #endif
87 if (nev & EV_WRITE) 98 if (nev & EV_WRITE)
88 FD_SET (handle, (fd_set *)vec_wi); 99 FD_SET (handle, (fd_set *)vec_wi);
89 else 100 else
90 FD_CLR (handle, (fd_set *)vec_wi); 101 FD_CLR (handle, (fd_set *)vec_wi);
91 102
92#else 103#else
93 104
94 int word = fd / NFDBITS; 105 int word = fd / NFDBITS;
95 fd_mask mask = 1UL << (fd % NFDBITS); 106 fd_mask mask = 1UL << (fd % NFDBITS);
… …
127{ 138{
128 struct timeval tv; 139 struct timeval tv;
129 int res; 140 int res;
130 int fd_setsize; 141 int fd_setsize;
131 142
143 EV_RELEASE_CB;
132 tv.tv_sec = (long)timeout; 144 tv.tv_sec = (long)timeout;
133 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 145 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
134 146
135#if EV_SELECT_USE_FD_SET 147#if EV_SELECT_USE_FD_SET
136 fd_setsize = sizeof (fd_set); 148 fd_setsize = sizeof (fd_set);
… …
147 * errors to be reported as an exception and not by setting 159 * errors to be reported as an exception and not by setting
148 * the writable bit. this is so uncontrollably lame. 160 * the writable bit. this is so uncontrollably lame.
149 */ 161 */
150 memcpy (vec_eo, vec_wi, fd_setsize); 162 memcpy (vec_eo, vec_wi, fd_setsize);
151 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); 163 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
164#elif EV_SELECT_USE_FD_SET
165 fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
166 res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
152#else 167#else
153 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 168 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
154#endif 169#endif
170 EV_ACQUIRE_CB;
155 171
156 if (expect_false (res < 0)) 172 if (expect_false (res < 0))
157 { 173 {
158 #if EV_SELECT_IS_WINSOCKET 174 #if EV_SELECT_IS_WINSOCKET
159 errno = WSAGetLastError (); 175 errno = WSAGetLastError ();
… …
168 #endif 184 #endif
169 185
170 #ifdef _WIN32 186 #ifdef _WIN32
171 /* select on windows errornously returns EINVAL when no fd sets have been 187 /* select on windows errornously returns EINVAL when no fd sets have been
172 * provided (this is documented). what microsoft doesn't tell you that this bug 188 * provided (this is documented). what microsoft doesn't tell you that this bug
173 * exists even when the fd sets are provided, so we have to check for this bug 189 * exists even when the fd sets _are_ provided, so we have to check for this bug
174 * here and emulate by sleeping manually. 190 * here and emulate by sleeping manually.
175 * we also get EINVAL when the timeout is invalid, but we ignore this case here 191 * we also get EINVAL when the timeout is invalid, but we ignore this case here
176 * and assume that EINVAL always means: you have to wait manually. 192 * and assume that EINVAL always means: you have to wait manually.
177 */ 193 */
178 if (errno == EINVAL) 194 if (errno == EINVAL)
… …
185 if (errno == EBADF) 201 if (errno == EBADF)
186 fd_ebadf (EV_A); 202 fd_ebadf (EV_A);
187 else if (errno == ENOMEM && !syserr_cb) 203 else if (errno == ENOMEM && !syserr_cb)
188 fd_enomem (EV_A); 204 fd_enomem (EV_A);
189 else if (errno != EINTR) 205 else if (errno != EINTR)
190 syserr ("(libev) select"); 206 ev_syserr ("(libev) select");
191 207
192 return; 208 return;
193 } 209 }
194 210
195#if EV_SELECT_USE_FD_SET 211#if EV_SELECT_USE_FD_SET
… …
254 backend_fudge = 0.; /* posix says this is zero */ 270 backend_fudge = 0.; /* posix says this is zero */
255 backend_modify = select_modify; 271 backend_modify = select_modify;
256 backend_poll = select_poll; 272 backend_poll = select_poll;
257 273
258#if EV_SELECT_USE_FD_SET 274#if EV_SELECT_USE_FD_SET
259 vec_max = FD_SETSIZE / 32;
260 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); 275 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
261 vec_ro = ev_malloc (sizeof (fd_set)); 276 vec_ro = ev_malloc (sizeof (fd_set));
262 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); 277 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
263 vec_wo = ev_malloc (sizeof (fd_set)); 278 vec_wo = ev_malloc (sizeof (fd_set));
264 #ifdef _WIN32 279 #ifdef _WIN32
265 vec_eo = ev_malloc (sizeof (fd_set)); 280 vec_eo = ev_malloc (sizeof (fd_set));
266 #endif 281 #endif
267#else 282#else
268 vec_max = 0; 283 vec_max = 0;
269 vec_ri = 0; 284 vec_ri = 0;
270 vec_ri = 0; 285 vec_ro = 0;
286 vec_wi = 0;
271 vec_wo = 0; 287 vec_wo = 0;
288 #ifdef _WIN32
272 vec_wo = 0; 289 vec_eo = 0;
290 #endif
273#endif 291#endif
274 292
275 return EVBACKEND_SELECT; 293 return EVBACKEND_SELECT;
276} 294}
277 295
… …
280{ 298{
281 ev_free (vec_ri); 299 ev_free (vec_ri);
282 ev_free (vec_ro); 300 ev_free (vec_ro);
283 ev_free (vec_wi); 301 ev_free (vec_wi);
284 ev_free (vec_wo); 302 ev_free (vec_wo);
303 #ifdef _WIN32
304 ev_free (vec_eo);
305 #endif
285} 306}
286 307
287 308

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