1 | /* |
1 | /* |
2 | * libev select fd activity backend |
2 | * libev select fd activity backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007,2008,2009 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 | * |
… | |
… | |
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)); |
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76 | |
75 | |
77 | #if EV_SELECT_IS_WINSOCKET |
76 | #if EV_SELECT_IS_WINSOCKET |
78 | SOCKET handle = anfds [fd].handle; |
77 | SOCKET handle = anfds [fd].handle; |
79 | #else |
78 | #else |
80 | int handle = fd; |
79 | int handle = fd; |
81 | #endif |
80 | #endif |
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81 | |
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82 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
82 | |
83 | |
83 | /* 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, |
84 | * 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. |
85 | */ |
86 | */ |
86 | #if EV_SELECT_IS_WINSOCKET |
87 | #if EV_SELECT_IS_WINSOCKET |
… | |
… | |
137 | { |
138 | { |
138 | struct timeval tv; |
139 | struct timeval tv; |
139 | int res; |
140 | int res; |
140 | int fd_setsize; |
141 | int fd_setsize; |
141 | |
142 | |
142 | tv.tv_sec = (long)timeout; |
143 | EV_RELEASE_CB; |
143 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
144 | EV_TV_SET (tv, timeout); |
144 | |
145 | |
145 | #if EV_SELECT_USE_FD_SET |
146 | #if EV_SELECT_USE_FD_SET |
146 | fd_setsize = sizeof (fd_set); |
147 | fd_setsize = sizeof (fd_set); |
147 | #else |
148 | #else |
148 | fd_setsize = vec_max * NFDBYTES; |
149 | fd_setsize = vec_max * NFDBYTES; |
… | |
… | |
163 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
164 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
164 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
165 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
165 | #else |
166 | #else |
166 | 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); |
167 | #endif |
168 | #endif |
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169 | EV_ACQUIRE_CB; |
168 | |
170 | |
169 | if (expect_false (res < 0)) |
171 | if (expect_false (res < 0)) |
170 | { |
172 | { |
171 | #if EV_SELECT_IS_WINSOCKET |
173 | #if EV_SELECT_IS_WINSOCKET |
172 | errno = WSAGetLastError (); |
174 | errno = WSAGetLastError (); |
… | |
… | |
179 | else |
181 | else |
180 | errno -= WSABASEERR; |
182 | errno -= WSABASEERR; |
181 | #endif |
183 | #endif |
182 | |
184 | |
183 | #ifdef _WIN32 |
185 | #ifdef _WIN32 |
184 | /* 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 |
185 | * 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 |
186 | * 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 |
187 | * here and emulate by sleeping manually. |
189 | * here and emulate by sleeping manually. |
188 | * 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 |
189 | * and assume that EINVAL always means: you have to wait manually. |
191 | * and assume that EINVAL always means: you have to wait manually. |
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277 | vec_eo = ev_malloc (sizeof (fd_set)); |
279 | vec_eo = ev_malloc (sizeof (fd_set)); |
278 | #endif |
280 | #endif |
279 | #else |
281 | #else |
280 | vec_max = 0; |
282 | vec_max = 0; |
281 | vec_ri = 0; |
283 | vec_ri = 0; |
282 | vec_ri = 0; |
284 | vec_ro = 0; |
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285 | vec_wi = 0; |
283 | vec_wo = 0; |
286 | vec_wo = 0; |
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287 | #ifdef _WIN32 |
284 | vec_wo = 0; |
288 | vec_eo = 0; |
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289 | #endif |
285 | #endif |
290 | #endif |
286 | |
291 | |
287 | return EVBACKEND_SELECT; |
292 | return EVBACKEND_SELECT; |
288 | } |
293 | } |
289 | |
294 | |
… | |
… | |
292 | { |
297 | { |
293 | ev_free (vec_ri); |
298 | ev_free (vec_ri); |
294 | ev_free (vec_ro); |
299 | ev_free (vec_ro); |
295 | ev_free (vec_wi); |
300 | ev_free (vec_wi); |
296 | ev_free (vec_wo); |
301 | ev_free (vec_wo); |
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302 | #ifdef _WIN32 |
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303 | ev_free (vec_eo); |
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304 | #endif |
297 | } |
305 | } |
298 | |
306 | |
299 | |
307 | |