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Comparing libev/ev_select.c (file contents):
Revision 1.37 by root, Mon Jun 9 14:11:30 2008 UTC vs.
Revision 1.50 by root, Sun Jan 30 19:05:41 2011 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 *
… …
37 * either the BSD or the GPL. 37 * either the BSD or the GPL.
38 */ 38 */
39 39
40#ifndef _WIN32 40#ifndef _WIN32
41/* for unix systems */ 41/* for unix systems */
42# include <inttypes.h>
43# ifndef __hpux
44/* for REAL unix systems */
42# include <sys/select.h> 45# include <sys/select.h>
43# include <inttypes.h> 46# endif
44#endif 47#endif
45 48
46#ifndef EV_SELECT_USE_FD_SET 49#ifndef EV_SELECT_USE_FD_SET
47# ifdef NFDBITS 50# ifdef NFDBITS
48# define EV_SELECT_USE_FD_SET 0 51# define EV_SELECT_USE_FD_SET 0
… …
76 #if EV_SELECT_IS_WINSOCKET 79 #if EV_SELECT_IS_WINSOCKET
77 SOCKET handle = anfds [fd].handle; 80 SOCKET handle = anfds [fd].handle;
78 #else 81 #else
79 int handle = fd; 82 int handle = fd;
80 #endif 83 #endif
84
85 assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE));
81 86
82 /* FD_SET is broken on windows (it adds the fd to a set twice or more, 87 /* 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. 88 * which eventually leads to overflows). Need to call it only on changes.
84 */ 89 */
85 #if EV_SELECT_IS_WINSOCKET 90 #if EV_SELECT_IS_WINSOCKET
… …
136{ 141{
137 struct timeval tv; 142 struct timeval tv;
138 int res; 143 int res;
139 int fd_setsize; 144 int fd_setsize;
140 145
141 tv.tv_sec = (long)timeout; 146 EV_RELEASE_CB;
142 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 147 EV_TV_SET (tv, timeout);
143 148
144#if EV_SELECT_USE_FD_SET 149#if EV_SELECT_USE_FD_SET
145 fd_setsize = sizeof (fd_set); 150 fd_setsize = sizeof (fd_set);
146#else 151#else
147 fd_setsize = vec_max * NFDBYTES; 152 fd_setsize = vec_max * NFDBYTES;
… …
156 * errors to be reported as an exception and not by setting 161 * errors to be reported as an exception and not by setting
157 * the writable bit. this is so uncontrollably lame. 162 * the writable bit. this is so uncontrollably lame.
158 */ 163 */
159 memcpy (vec_eo, vec_wi, fd_setsize); 164 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); 165 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv);
166#elif EV_SELECT_USE_FD_SET
167 fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE;
168 res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
161#else 169#else
162 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 170 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
163#endif 171#endif
172 EV_ACQUIRE_CB;
164 173
165 if (expect_false (res < 0)) 174 if (expect_false (res < 0))
166 { 175 {
167 #if EV_SELECT_IS_WINSOCKET 176 #if EV_SELECT_IS_WINSOCKET
168 errno = WSAGetLastError (); 177 errno = WSAGetLastError ();
… …
175 else 184 else
176 errno -= WSABASEERR; 185 errno -= WSABASEERR;
177 #endif 186 #endif
178 187
179 #ifdef _WIN32 188 #ifdef _WIN32
180 /* select on windows errornously returns EINVAL when no fd sets have been 189 /* 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 190 * 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 191 * exists even when the fd sets _are_ provided, so we have to check for this bug
183 * here and emulate by sleeping manually. 192 * here and emulate by sleeping manually.
184 * we also get EINVAL when the timeout is invalid, but we ignore this case here 193 * 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. 194 * and assume that EINVAL always means: you have to wait manually.
186 */ 195 */
187 if (errno == EINVAL) 196 if (errno == EINVAL)
… …
194 if (errno == EBADF) 203 if (errno == EBADF)
195 fd_ebadf (EV_A); 204 fd_ebadf (EV_A);
196 else if (errno == ENOMEM && !syserr_cb) 205 else if (errno == ENOMEM && !syserr_cb)
197 fd_enomem (EV_A); 206 fd_enomem (EV_A);
198 else if (errno != EINTR) 207 else if (errno != EINTR)
199 syserr ("(libev) select"); 208 ev_syserr ("(libev) select");
200 209
201 return; 210 return;
202 } 211 }
203 212
204#if EV_SELECT_USE_FD_SET 213#if EV_SELECT_USE_FD_SET
… …
263 backend_fudge = 0.; /* posix says this is zero */ 272 backend_fudge = 0.; /* posix says this is zero */
264 backend_modify = select_modify; 273 backend_modify = select_modify;
265 backend_poll = select_poll; 274 backend_poll = select_poll;
266 275
267#if EV_SELECT_USE_FD_SET 276#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); 277 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
270 vec_ro = ev_malloc (sizeof (fd_set)); 278 vec_ro = ev_malloc (sizeof (fd_set));
271 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); 279 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
272 vec_wo = ev_malloc (sizeof (fd_set)); 280 vec_wo = ev_malloc (sizeof (fd_set));
273 #ifdef _WIN32 281 #ifdef _WIN32
274 vec_eo = ev_malloc (sizeof (fd_set)); 282 vec_eo = ev_malloc (sizeof (fd_set));
275 #endif 283 #endif
276#else 284#else
277 vec_max = 0; 285 vec_max = 0;
278 vec_ri = 0; 286 vec_ri = 0;
279 vec_ri = 0; 287 vec_ro = 0;
288 vec_wi = 0;
280 vec_wo = 0; 289 vec_wo = 0;
290 #ifdef _WIN32
281 vec_wo = 0; 291 vec_eo = 0;
292 #endif
282#endif 293#endif
283 294
284 return EVBACKEND_SELECT; 295 return EVBACKEND_SELECT;
285} 296}
286 297
… …
289{ 300{
290 ev_free (vec_ri); 301 ev_free (vec_ri);
291 ev_free (vec_ro); 302 ev_free (vec_ro);
292 ev_free (vec_wi); 303 ev_free (vec_wi);
293 ev_free (vec_wo); 304 ev_free (vec_wo);
305 #ifdef _WIN32
306 ev_free (vec_eo);
307 #endif
294} 308}
295 309
296 310

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