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 | * |
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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 |
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57 | # undef NFDBITS |
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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 |
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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 | |
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82 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
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83 | |
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84 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
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85 | * which eventually leads to overflows). Need to call it only on changes. |
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86 | */ |
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87 | #if EV_SELECT_IS_WINSOCKET |
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88 | if ((oev ^ nev) & EV_READ) |
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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 | |
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95 | #if EV_SELECT_IS_WINSOCKET |
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96 | if ((oev ^ nev) & EV_WRITE) |
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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); |
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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 | |
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143 | EV_RELEASE_CB; |
130 | tv.tv_sec = (long)timeout; |
144 | tv.tv_sec = (long)timeout; |
131 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
145 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
132 | |
146 | |
133 | #if EV_SELECT_USE_FD_SET |
147 | #if EV_SELECT_USE_FD_SET |
134 | fd_setsize = sizeof (fd_set); |
148 | fd_setsize = sizeof (fd_set); |
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145 | * errors to be reported as an exception and not by setting |
159 | * errors to be reported as an exception and not by setting |
146 | * the writable bit. this is so uncontrollably lame. |
160 | * the writable bit. this is so uncontrollably lame. |
147 | */ |
161 | */ |
148 | memcpy (vec_eo, vec_wi, fd_setsize); |
162 | 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); |
163 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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164 | #elif EV_SELECT_USE_FD_SET |
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165 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
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166 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
150 | #else |
167 | #else |
151 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
168 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
152 | #endif |
169 | #endif |
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170 | EV_ACQUIRE_CB; |
153 | |
171 | |
154 | if (expect_false (res < 0)) |
172 | if (expect_false (res < 0)) |
155 | { |
173 | { |
156 | #if EV_SELECT_IS_WINSOCKET |
174 | #if EV_SELECT_IS_WINSOCKET |
157 | errno = WSAGetLastError (); |
175 | errno = WSAGetLastError (); |
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166 | #endif |
184 | #endif |
167 | |
185 | |
168 | #ifdef _WIN32 |
186 | #ifdef _WIN32 |
169 | /* select on windows errornously returns EINVAL when no fd sets have been |
187 | /* select on windows errornously returns EINVAL when no fd sets have been |
170 | * provided (this is documented). what microsoft doesn't tell you that this bug |
188 | * 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 |
189 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
172 | * here and emulate by sleeping manually. |
190 | * here and emulate by sleeping manually. |
173 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
191 | * 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. |
192 | * and assume that EINVAL always means: you have to wait manually. |
175 | */ |
193 | */ |
176 | if (errno == EINVAL) |
194 | if (errno == EINVAL) |
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183 | if (errno == EBADF) |
201 | if (errno == EBADF) |
184 | fd_ebadf (EV_A); |
202 | fd_ebadf (EV_A); |
185 | else if (errno == ENOMEM && !syserr_cb) |
203 | else if (errno == ENOMEM && !syserr_cb) |
186 | fd_enomem (EV_A); |
204 | fd_enomem (EV_A); |
187 | else if (errno != EINTR) |
205 | else if (errno != EINTR) |
188 | syserr ("(libev) select"); |
206 | ev_syserr ("(libev) select"); |
189 | |
207 | |
190 | return; |
208 | return; |
191 | } |
209 | } |
192 | |
210 | |
193 | #if EV_SELECT_USE_FD_SET |
211 | #if EV_SELECT_USE_FD_SET |
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223 | for (word = vec_max; word--; ) |
241 | for (word = vec_max; word--; ) |
224 | { |
242 | { |
225 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
243 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
226 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
244 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
227 | #ifdef _WIN32 |
245 | #ifdef _WIN32 |
228 | word_r |= ((fd_mask *)vec_eo) [word]; |
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229 | word_w |= ((fd_mask *)vec_eo) [word]; |
246 | word_w |= ((fd_mask *)vec_eo) [word]; |
230 | #endif |
247 | #endif |
231 | |
248 | |
232 | if (word_r || word_w) |
249 | if (word_r || word_w) |
233 | for (bit = NFDBITS; bit--; ) |
250 | for (bit = NFDBITS; bit--; ) |
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253 | backend_fudge = 0.; /* posix says this is zero */ |
270 | backend_fudge = 0.; /* posix says this is zero */ |
254 | backend_modify = select_modify; |
271 | backend_modify = select_modify; |
255 | backend_poll = select_poll; |
272 | backend_poll = select_poll; |
256 | |
273 | |
257 | #if EV_SELECT_USE_FD_SET |
274 | #if EV_SELECT_USE_FD_SET |
258 | vec_max = FD_SETSIZE / 32; |
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259 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
275 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
260 | vec_ro = ev_malloc (sizeof (fd_set)); |
276 | vec_ro = ev_malloc (sizeof (fd_set)); |
261 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
277 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
262 | vec_wo = ev_malloc (sizeof (fd_set)); |
278 | vec_wo = ev_malloc (sizeof (fd_set)); |
263 | #ifdef _WIN32 |
279 | #ifdef _WIN32 |