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 |
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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 |
… | |
… | |
68 | if (oev == nev) |
70 | if (oev == nev) |
69 | return; |
71 | return; |
70 | |
72 | |
71 | { |
73 | { |
72 | #if EV_SELECT_USE_FD_SET |
74 | #if EV_SELECT_USE_FD_SET |
73 | |
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74 | #if EV_SELECT_IS_WINSOCKET |
75 | #if EV_SELECT_IS_WINSOCKET |
75 | SOCKET handle = anfds [fd].handle; |
76 | SOCKET handle = anfds [fd].handle; |
76 | #else |
77 | #else |
77 | int handle = fd; |
78 | int handle = fd; |
78 | #endif |
79 | #endif |
79 | |
80 | |
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81 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
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82 | |
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83 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
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84 | * which eventually leads to overflows). Need to call it only on changes. |
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85 | */ |
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86 | #if EV_SELECT_IS_WINSOCKET |
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87 | if ((oev ^ nev) & EV_READ) |
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88 | #endif |
80 | if (nev & EV_READ) |
89 | if (nev & EV_READ) |
81 | FD_SET (handle, (fd_set *)vec_ri); |
90 | FD_SET (handle, (fd_set *)vec_ri); |
82 | else |
91 | else |
83 | FD_CLR (handle, (fd_set *)vec_ri); |
92 | FD_CLR (handle, (fd_set *)vec_ri); |
84 | |
93 | |
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94 | #if EV_SELECT_IS_WINSOCKET |
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95 | if ((oev ^ nev) & EV_WRITE) |
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96 | #endif |
85 | if (nev & EV_WRITE) |
97 | if (nev & EV_WRITE) |
86 | FD_SET (handle, (fd_set *)vec_wi); |
98 | FD_SET (handle, (fd_set *)vec_wi); |
87 | else |
99 | else |
88 | FD_CLR (handle, (fd_set *)vec_wi); |
100 | FD_CLR (handle, (fd_set *)vec_wi); |
89 | |
101 | |
90 | #else |
102 | #else |
91 | |
103 | |
92 | int word = fd / NFDBITS; |
104 | int word = fd / NFDBITS; |
93 | fd_mask mask = 1UL << (fd % NFDBITS); |
105 | fd_mask mask = 1UL << (fd % NFDBITS); |
… | |
… | |
145 | * errors to be reported as an exception and not by setting |
157 | * errors to be reported as an exception and not by setting |
146 | * the writable bit. this is so uncontrollably lame. |
158 | * the writable bit. this is so uncontrollably lame. |
147 | */ |
159 | */ |
148 | memcpy (vec_eo, vec_wi, fd_setsize); |
160 | 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); |
161 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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162 | #elif EV_SELECT_USE_FD_SET |
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163 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
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164 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
150 | #else |
165 | #else |
151 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
166 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
152 | #endif |
167 | #endif |
153 | |
168 | |
154 | if (expect_false (res < 0)) |
169 | if (expect_false (res < 0)) |
… | |
… | |
166 | #endif |
181 | #endif |
167 | |
182 | |
168 | #ifdef _WIN32 |
183 | #ifdef _WIN32 |
169 | /* select on windows errornously returns EINVAL when no fd sets have been |
184 | /* 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 |
185 | * 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 |
186 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
172 | * here and emulate by sleeping manually. |
187 | * here and emulate by sleeping manually. |
173 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
188 | * 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. |
189 | * and assume that EINVAL always means: you have to wait manually. |
175 | */ |
190 | */ |
176 | if (errno == EINVAL) |
191 | if (errno == EINVAL) |
… | |
… | |
183 | if (errno == EBADF) |
198 | if (errno == EBADF) |
184 | fd_ebadf (EV_A); |
199 | fd_ebadf (EV_A); |
185 | else if (errno == ENOMEM && !syserr_cb) |
200 | else if (errno == ENOMEM && !syserr_cb) |
186 | fd_enomem (EV_A); |
201 | fd_enomem (EV_A); |
187 | else if (errno != EINTR) |
202 | else if (errno != EINTR) |
188 | syserr ("(libev) select"); |
203 | ev_syserr ("(libev) select"); |
189 | |
204 | |
190 | return; |
205 | return; |
191 | } |
206 | } |
192 | |
207 | |
193 | #if EV_SELECT_USE_FD_SET |
208 | #if EV_SELECT_USE_FD_SET |
… | |
… | |
252 | backend_fudge = 0.; /* posix says this is zero */ |
267 | backend_fudge = 0.; /* posix says this is zero */ |
253 | backend_modify = select_modify; |
268 | backend_modify = select_modify; |
254 | backend_poll = select_poll; |
269 | backend_poll = select_poll; |
255 | |
270 | |
256 | #if EV_SELECT_USE_FD_SET |
271 | #if EV_SELECT_USE_FD_SET |
257 | vec_max = FD_SETSIZE / 32; |
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258 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
272 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
259 | vec_ro = ev_malloc (sizeof (fd_set)); |
273 | vec_ro = ev_malloc (sizeof (fd_set)); |
260 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
274 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
261 | vec_wo = ev_malloc (sizeof (fd_set)); |
275 | vec_wo = ev_malloc (sizeof (fd_set)); |
262 | #ifdef _WIN32 |
276 | #ifdef _WIN32 |