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 | * |
… | |
… | |
52 | #endif |
52 | #endif |
53 | |
53 | |
54 | #if EV_SELECT_IS_WINSOCKET |
54 | #if EV_SELECT_IS_WINSOCKET |
55 | # undef EV_SELECT_USE_FD_SET |
55 | # undef EV_SELECT_USE_FD_SET |
56 | # define EV_SELECT_USE_FD_SET 1 |
56 | # define EV_SELECT_USE_FD_SET 1 |
|
|
57 | # undef NFDBITS |
|
|
58 | # define NFDBITS 0 |
57 | #endif |
59 | #endif |
58 | |
60 | |
59 | #if !EV_SELECT_USE_FD_SET |
61 | #if !EV_SELECT_USE_FD_SET |
60 | # define NFDBYTES (NFDBITS / 8) |
62 | # define NFDBYTES (NFDBITS / 8) |
61 | #endif |
63 | #endif |
… | |
… | |
75 | SOCKET handle = anfds [fd].handle; |
77 | SOCKET handle = anfds [fd].handle; |
76 | #else |
78 | #else |
77 | int handle = fd; |
79 | int handle = fd; |
78 | #endif |
80 | #endif |
79 | |
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 |
80 | if (nev & EV_READ) |
90 | if (nev & EV_READ) |
81 | FD_SET (handle, (fd_set *)vec_ri); |
91 | FD_SET (handle, (fd_set *)vec_ri); |
82 | else |
92 | else |
83 | FD_CLR (handle, (fd_set *)vec_ri); |
93 | FD_CLR (handle, (fd_set *)vec_ri); |
84 | |
94 | |
|
|
95 | #if EV_SELECT_IS_WINSOCKET |
|
|
96 | if ((oev ^ nev) & EV_WRITE) |
|
|
97 | #endif |
85 | if (nev & EV_WRITE) |
98 | if (nev & EV_WRITE) |
86 | FD_SET (handle, (fd_set *)vec_wi); |
99 | FD_SET (handle, (fd_set *)vec_wi); |
87 | else |
100 | else |
88 | FD_CLR (handle, (fd_set *)vec_wi); |
101 | FD_CLR (handle, (fd_set *)vec_wi); |
89 | |
102 | |
90 | #else |
103 | #else |
91 | |
104 | |
92 | int word = fd / NFDBITS; |
105 | int word = fd / NFDBITS; |
93 | fd_mask mask = 1UL << (fd % NFDBITS); |
106 | fd_mask mask = 1UL << (fd % NFDBITS); |
… | |
… | |
125 | { |
138 | { |
126 | struct timeval tv; |
139 | struct timeval tv; |
127 | int res; |
140 | int res; |
128 | int fd_setsize; |
141 | int fd_setsize; |
129 | |
142 | |
130 | tv.tv_sec = (long)timeout; |
143 | EV_RELEASE_CB; |
131 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
144 | EV_TV_SET (tv, timeout); |
132 | |
145 | |
133 | #if EV_SELECT_USE_FD_SET |
146 | #if EV_SELECT_USE_FD_SET |
134 | fd_setsize = sizeof (fd_set); |
147 | fd_setsize = sizeof (fd_set); |
135 | #else |
148 | #else |
136 | fd_setsize = vec_max * NFDBYTES; |
149 | fd_setsize = vec_max * NFDBYTES; |
… | |
… | |
145 | * errors to be reported as an exception and not by setting |
158 | * errors to be reported as an exception and not by setting |
146 | * the writable bit. this is so uncontrollably lame. |
159 | * the writable bit. this is so uncontrollably lame. |
147 | */ |
160 | */ |
148 | memcpy (vec_eo, vec_wi, fd_setsize); |
161 | memcpy (vec_eo, vec_wi, fd_setsize); |
149 | 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); |
150 | #else |
166 | #else |
151 | 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); |
152 | #endif |
168 | #endif |
|
|
169 | EV_ACQUIRE_CB; |
153 | |
170 | |
154 | if (expect_false (res < 0)) |
171 | if (expect_false (res < 0)) |
155 | { |
172 | { |
156 | #if EV_SELECT_IS_WINSOCKET |
173 | #if EV_SELECT_IS_WINSOCKET |
157 | errno = WSAGetLastError (); |
174 | errno = WSAGetLastError (); |
… | |
… | |
164 | else |
181 | else |
165 | errno -= WSABASEERR; |
182 | errno -= WSABASEERR; |
166 | #endif |
183 | #endif |
167 | |
184 | |
168 | #ifdef _WIN32 |
185 | #ifdef _WIN32 |
169 | /* 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 |
170 | * 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 |
171 | * 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 |
172 | * here and emulate by sleeping manually. |
189 | * here and emulate by sleeping manually. |
173 | * 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 |
174 | * and assume that EINVAL always means: you have to wait manually. |
191 | * and assume that EINVAL always means: you have to wait manually. |
175 | */ |
192 | */ |
176 | if (errno == EINVAL) |
193 | if (errno == EINVAL) |
… | |
… | |
183 | if (errno == EBADF) |
200 | if (errno == EBADF) |
184 | fd_ebadf (EV_A); |
201 | fd_ebadf (EV_A); |
185 | else if (errno == ENOMEM && !syserr_cb) |
202 | else if (errno == ENOMEM && !syserr_cb) |
186 | fd_enomem (EV_A); |
203 | fd_enomem (EV_A); |
187 | else if (errno != EINTR) |
204 | else if (errno != EINTR) |
188 | syserr ("(libev) select"); |
205 | ev_syserr ("(libev) select"); |
189 | |
206 | |
190 | return; |
207 | return; |
191 | } |
208 | } |
192 | |
209 | |
193 | #if EV_SELECT_USE_FD_SET |
210 | #if EV_SELECT_USE_FD_SET |
… | |
… | |
252 | backend_fudge = 0.; /* posix says this is zero */ |
269 | backend_fudge = 0.; /* posix says this is zero */ |
253 | backend_modify = select_modify; |
270 | backend_modify = select_modify; |
254 | backend_poll = select_poll; |
271 | backend_poll = select_poll; |
255 | |
272 | |
256 | #if EV_SELECT_USE_FD_SET |
273 | #if EV_SELECT_USE_FD_SET |
257 | vec_max = FD_SETSIZE / 32; |
|
|
258 | 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); |
259 | vec_ro = ev_malloc (sizeof (fd_set)); |
275 | vec_ro = ev_malloc (sizeof (fd_set)); |
260 | 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); |
261 | vec_wo = ev_malloc (sizeof (fd_set)); |
277 | vec_wo = ev_malloc (sizeof (fd_set)); |
262 | #ifdef _WIN32 |
278 | #ifdef _WIN32 |
263 | vec_eo = ev_malloc (sizeof (fd_set)); |
279 | vec_eo = ev_malloc (sizeof (fd_set)); |
264 | #endif |
280 | #endif |
265 | #else |
281 | #else |
266 | vec_max = 0; |
282 | vec_max = 0; |
267 | vec_ri = 0; |
283 | vec_ri = 0; |
268 | vec_ri = 0; |
284 | vec_ro = 0; |
|
|
285 | vec_wi = 0; |
269 | vec_wo = 0; |
286 | vec_wo = 0; |
|
|
287 | #ifdef _WIN32 |
270 | vec_wo = 0; |
288 | vec_eo = 0; |
|
|
289 | #endif |
271 | #endif |
290 | #endif |
272 | |
291 | |
273 | return EVBACKEND_SELECT; |
292 | return EVBACKEND_SELECT; |
274 | } |
293 | } |
275 | |
294 | |
… | |
… | |
278 | { |
297 | { |
279 | ev_free (vec_ri); |
298 | ev_free (vec_ri); |
280 | ev_free (vec_ro); |
299 | ev_free (vec_ro); |
281 | ev_free (vec_wi); |
300 | ev_free (vec_wi); |
282 | ev_free (vec_wo); |
301 | ev_free (vec_wo); |
|
|
302 | #ifdef _WIN32 |
|
|
303 | ev_free (vec_eo); |
|
|
304 | #endif |
283 | } |
305 | } |
284 | |
306 | |
285 | |
307 | |