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Comparing libev/ev_select.c (file contents):
Revision 1.38 by root, Wed Oct 29 06:32:48 2008 UTC vs.
Revision 1.48 by root, Fri Oct 15 22:44:42 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 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
82 /* FD_SET is broken on windows (it adds the fd to a set twice or more, 84 /* 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. 85 * which eventually leads to overflows). Need to call it only on changes.
84 */ 86 */
85 #if EV_SELECT_IS_WINSOCKET 87 #if EV_SELECT_IS_WINSOCKET
86 if ((oev ^ nev) & EV_READ) 88 if ((oev ^ nev) & EV_READ)
… …
136{ 138{
137 struct timeval tv; 139 struct timeval tv;
138 int res; 140 int res;
139 int fd_setsize; 141 int fd_setsize;
140 142
141 tv.tv_sec = (long)timeout; 143 EV_RELEASE_CB;
142 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 144 EV_TV_SET (tv, timeout);
143 145
144#if EV_SELECT_USE_FD_SET 146#if EV_SELECT_USE_FD_SET
145 fd_setsize = sizeof (fd_set); 147 fd_setsize = sizeof (fd_set);
146#else 148#else
147 fd_setsize = vec_max * NFDBYTES; 149 fd_setsize = vec_max * NFDBYTES;
… …
156 * errors to be reported as an exception and not by setting 158 * errors to be reported as an exception and not by setting
157 * the writable bit. this is so uncontrollably lame. 159 * the writable bit. this is so uncontrollably lame.
158 */ 160 */
159 memcpy (vec_eo, vec_wi, fd_setsize); 161 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); 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);
161#else 166#else
162 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);
163#endif 168#endif
169 EV_ACQUIRE_CB;
164 170
165 if (expect_false (res < 0)) 171 if (expect_false (res < 0))
166 { 172 {
167 #if EV_SELECT_IS_WINSOCKET 173 #if EV_SELECT_IS_WINSOCKET
168 errno = WSAGetLastError (); 174 errno = WSAGetLastError ();
… …
175 else 181 else
176 errno -= WSABASEERR; 182 errno -= WSABASEERR;
177 #endif 183 #endif
178 184
179 #ifdef _WIN32 185 #ifdef _WIN32
180 /* 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
181 * 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
182 * 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
183 * here and emulate by sleeping manually. 189 * here and emulate by sleeping manually.
184 * 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
185 * and assume that EINVAL always means: you have to wait manually. 191 * and assume that EINVAL always means: you have to wait manually.
186 */ 192 */
187 if (errno == EINVAL) 193 if (errno == EINVAL)
… …
263 backend_fudge = 0.; /* posix says this is zero */ 269 backend_fudge = 0.; /* posix says this is zero */
264 backend_modify = select_modify; 270 backend_modify = select_modify;
265 backend_poll = select_poll; 271 backend_poll = select_poll;
266 272
267#if EV_SELECT_USE_FD_SET 273#if EV_SELECT_USE_FD_SET
268 vec_max = FD_SETSIZE / 32;
269 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);
270 vec_ro = ev_malloc (sizeof (fd_set)); 275 vec_ro = ev_malloc (sizeof (fd_set));
271 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);
272 vec_wo = ev_malloc (sizeof (fd_set)); 277 vec_wo = ev_malloc (sizeof (fd_set));
273 #ifdef _WIN32 278 #ifdef _WIN32
274 vec_eo = ev_malloc (sizeof (fd_set)); 279 vec_eo = ev_malloc (sizeof (fd_set));
275 #endif 280 #endif
276#else 281#else
277 vec_max = 0; 282 vec_max = 0;
278 vec_ri = 0; 283 vec_ri = 0;
279 vec_ri = 0; 284 vec_ro = 0;
285 vec_wi = 0;
280 vec_wo = 0; 286 vec_wo = 0;
287 #ifdef _WIN32
281 vec_wo = 0; 288 vec_eo = 0;
289 #endif
282#endif 290#endif
283 291
284 return EVBACKEND_SELECT; 292 return EVBACKEND_SELECT;
285} 293}
286 294
… …
289{ 297{
290 ev_free (vec_ri); 298 ev_free (vec_ri);
291 ev_free (vec_ro); 299 ev_free (vec_ro);
292 ev_free (vec_wi); 300 ev_free (vec_wi);
293 ev_free (vec_wo); 301 ev_free (vec_wo);
302 #ifdef _WIN32
303 ev_free (vec_eo);
304 #endif
294} 305}
295 306
296 307

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