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 | * |
… | |
… | |
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. |
… | |
… | |
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 | |