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/cvs/libev/ev_select.c
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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 1.40 by root, Tue Jan 6 19:46:56 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 *
… …
70 if (oev == nev) 70 if (oev == nev)
71 return; 71 return;
72 72
73 { 73 {
74#if EV_SELECT_USE_FD_SET 74#if EV_SELECT_USE_FD_SET
75 assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE));
75 76
76 #if EV_SELECT_IS_WINSOCKET 77 #if EV_SELECT_IS_WINSOCKET
77 SOCKET handle = anfds [fd].handle; 78 SOCKET handle = anfds [fd].handle;
78 #else 79 #else
79 int handle = fd; 80 int handle = fd;
80 #endif 81 #endif
81 82
83 /* FD_SET is broken on windows (it adds the fd to a set twice or more,
84 * which eventually leads to overflows). Need to call it only on changes.
85 */
86 #if EV_SELECT_IS_WINSOCKET
87 if ((oev ^ nev) & EV_READ)
88 #endif
82 if (nev & EV_READ) 89 if (nev & EV_READ)
83 FD_SET (handle, (fd_set *)vec_ri); 90 FD_SET (handle, (fd_set *)vec_ri);
84 else 91 else
85 FD_CLR (handle, (fd_set *)vec_ri); 92 FD_CLR (handle, (fd_set *)vec_ri);
86 93
94 #if EV_SELECT_IS_WINSOCKET
95 if ((oev ^ nev) & EV_WRITE)
96 #endif
87 if (nev & EV_WRITE) 97 if (nev & EV_WRITE)
88 FD_SET (handle, (fd_set *)vec_wi); 98 FD_SET (handle, (fd_set *)vec_wi);
89 else 99 else
90 FD_CLR (handle, (fd_set *)vec_wi); 100 FD_CLR (handle, (fd_set *)vec_wi);
91 101
92#else 102#else
93 103
94 int word = fd / NFDBITS; 104 int word = fd / NFDBITS;
95 fd_mask mask = 1UL << (fd % NFDBITS); 105 fd_mask mask = 1UL << (fd % NFDBITS);
… …
147 * errors to be reported as an exception and not by setting 157 * errors to be reported as an exception and not by setting
148 * the writable bit. this is so uncontrollably lame. 158 * the writable bit. this is so uncontrollably lame.
149 */ 159 */
150 memcpy (vec_eo, vec_wi, fd_setsize); 160 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); 161 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
162#elif EV_SELECT_USE_FD_SET
163 fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
164 res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
152#else 165#else
153 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 166 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
154#endif 167#endif
155 168
156 if (expect_false (res < 0)) 169 if (expect_false (res < 0))
… …
168 #endif 181 #endif
169 182
170 #ifdef _WIN32 183 #ifdef _WIN32
171 /* select on windows errornously returns EINVAL when no fd sets have been 184 /* 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 185 * 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 186 * exists even when the fd sets _are_ provided, so we have to check for this bug
174 * here and emulate by sleeping manually. 187 * here and emulate by sleeping manually.
175 * we also get EINVAL when the timeout is invalid, but we ignore this case here 188 * 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. 189 * and assume that EINVAL always means: you have to wait manually.
177 */ 190 */
178 if (errno == EINVAL) 191 if (errno == EINVAL)
… …
185 if (errno == EBADF) 198 if (errno == EBADF)
186 fd_ebadf (EV_A); 199 fd_ebadf (EV_A);
187 else if (errno == ENOMEM && !syserr_cb) 200 else if (errno == ENOMEM && !syserr_cb)
188 fd_enomem (EV_A); 201 fd_enomem (EV_A);
189 else if (errno != EINTR) 202 else if (errno != EINTR)
190 syserr ("(libev) select"); 203 ev_syserr ("(libev) select");
191 204
192 return; 205 return;
193 } 206 }
194 207
195#if EV_SELECT_USE_FD_SET 208#if EV_SELECT_USE_FD_SET
… …
254 backend_fudge = 0.; /* posix says this is zero */ 267 backend_fudge = 0.; /* posix says this is zero */
255 backend_modify = select_modify; 268 backend_modify = select_modify;
256 backend_poll = select_poll; 269 backend_poll = select_poll;
257 270
258#if EV_SELECT_USE_FD_SET 271#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); 272 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
261 vec_ro = ev_malloc (sizeof (fd_set)); 273 vec_ro = ev_malloc (sizeof (fd_set));
262 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); 274 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
263 vec_wo = ev_malloc (sizeof (fd_set)); 275 vec_wo = ev_malloc (sizeof (fd_set));
264 #ifdef _WIN32 276 #ifdef _WIN32

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