1 | /* |
1 | /* |
2 | * libev select fd activity backend |
2 | * libev select fd activity backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007 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 |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * modification, are permitted provided that the following conditions are |
8 | * tion, are permitted provided that the following conditions are met: |
9 | * met: |
9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright notice, |
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11 | * this list of conditions and the following disclaimer. |
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12 | * |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
10 | * |
27 | * |
11 | * * Redistributions of source code must retain the above copyright |
28 | * Alternatively, the contents of this file may be used under the terms of |
12 | * notice, this list of conditions and the following disclaimer. |
29 | * the GNU General Public License ("GPL") version 2 or any later version, |
13 | * |
30 | * in which case the provisions of the GPL are applicable instead of |
14 | * * Redistributions in binary form must reproduce the above |
31 | * the above. If you wish to allow the use of your version of this file |
15 | * copyright notice, this list of conditions and the following |
32 | * only under the terms of the GPL and not to allow others to use your |
16 | * disclaimer in the documentation and/or other materials provided |
33 | * version of this file under the BSD license, indicate your decision |
17 | * with the distribution. |
34 | * by deleting the provisions above and replace them with the notice |
18 | * |
35 | * and other provisions required by the GPL. If you do not delete the |
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
36 | * provisions above, a recipient may use your version of this file under |
20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
37 | * either the BSD or the GPL. |
21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 | */ |
38 | */ |
31 | |
39 | |
32 | #ifndef _WIN32 |
40 | #ifndef _WIN32 |
33 | /* for unix systems */ |
41 | /* for unix systems */ |
34 | # include <sys/select.h> |
42 | # include <sys/select.h> |
… | |
… | |
44 | #endif |
52 | #endif |
45 | |
53 | |
46 | #if EV_SELECT_IS_WINSOCKET |
54 | #if EV_SELECT_IS_WINSOCKET |
47 | # undef EV_SELECT_USE_FD_SET |
55 | # undef EV_SELECT_USE_FD_SET |
48 | # define EV_SELECT_USE_FD_SET 1 |
56 | # define EV_SELECT_USE_FD_SET 1 |
49 | # undef EINTR |
57 | # undef NFDBITS |
50 | # define EINTR WSAEINTR |
58 | # define NFDBITS 0 |
51 | # undef EBADF |
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52 | # define EBADF WSAENOTSOCK |
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53 | # undef ENOMEM |
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54 | # define ENOMEM (errno + 1) |
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55 | #endif |
59 | #endif |
56 | |
60 | |
57 | #if !EV_SELECT_USE_FD_SET |
61 | #if !EV_SELECT_USE_FD_SET |
58 | # define NFDBYTES (NFDBITS / 8) |
62 | # define NFDBYTES (NFDBITS / 8) |
59 | #endif |
63 | #endif |
… | |
… | |
73 | SOCKET handle = anfds [fd].handle; |
77 | SOCKET handle = anfds [fd].handle; |
74 | #else |
78 | #else |
75 | int handle = fd; |
79 | int handle = fd; |
76 | #endif |
80 | #endif |
77 | |
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 |
78 | if (nev & EV_READ) |
90 | if (nev & EV_READ) |
79 | FD_SET (handle, (fd_set *)vec_ri); |
91 | FD_SET (handle, (fd_set *)vec_ri); |
80 | else |
92 | else |
81 | FD_CLR (handle, (fd_set *)vec_ri); |
93 | FD_CLR (handle, (fd_set *)vec_ri); |
82 | |
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 |
83 | if (nev & EV_WRITE) |
98 | if (nev & EV_WRITE) |
84 | FD_SET (handle, (fd_set *)vec_wi); |
99 | FD_SET (handle, (fd_set *)vec_wi); |
85 | else |
100 | else |
86 | FD_CLR (handle, (fd_set *)vec_wi); |
101 | FD_CLR (handle, (fd_set *)vec_wi); |
87 | |
102 | |
88 | #else |
103 | #else |
89 | |
104 | |
90 | int word = fd / NFDBITS; |
105 | int word = fd / NFDBITS; |
91 | int mask = 1UL << (fd % NFDBITS); |
106 | fd_mask mask = 1UL << (fd % NFDBITS); |
92 | |
107 | |
93 | if (vec_max < word + 1) |
108 | if (expect_false (vec_max <= word)) |
94 | { |
109 | { |
95 | int new_max = word + 1; |
110 | int new_max = word + 1; |
96 | |
111 | |
97 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
112 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
98 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
113 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
99 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
114 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
100 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
115 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
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116 | #ifdef _WIN32 |
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117 | vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */ |
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118 | #endif |
101 | |
119 | |
102 | for (; vec_max < new_max; ++vec_max) |
120 | for (; vec_max < new_max; ++vec_max) |
103 | ((fd_mask *)vec_ri)[vec_max] = |
121 | ((fd_mask *)vec_ri) [vec_max] = |
104 | ((fd_mask *)vec_wi)[vec_max] = 0; |
122 | ((fd_mask *)vec_wi) [vec_max] = 0; |
105 | } |
123 | } |
106 | |
124 | |
107 | ((fd_mask *)vec_ri) [word] |= mask; |
125 | ((fd_mask *)vec_ri) [word] |= mask; |
108 | if (!(nev & EV_READ)) |
126 | if (!(nev & EV_READ)) |
109 | ((fd_mask *)vec_ri) [word] &= ~mask; |
127 | ((fd_mask *)vec_ri) [word] &= ~mask; |
… | |
… | |
118 | static void |
136 | static void |
119 | select_poll (EV_P_ ev_tstamp timeout) |
137 | select_poll (EV_P_ ev_tstamp timeout) |
120 | { |
138 | { |
121 | struct timeval tv; |
139 | struct timeval tv; |
122 | int res; |
140 | int res; |
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141 | int fd_setsize; |
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142 | |
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143 | EV_RELEASE_CB; |
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144 | EV_TV_SET (tv, timeout); |
123 | |
145 | |
124 | #if EV_SELECT_USE_FD_SET |
146 | #if EV_SELECT_USE_FD_SET |
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147 | fd_setsize = sizeof (fd_set); |
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148 | #else |
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149 | fd_setsize = vec_max * NFDBYTES; |
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150 | #endif |
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151 | |
125 | memcpy (vec_ro, vec_ri, sizeof (fd_set)); |
152 | memcpy (vec_ro, vec_ri, fd_setsize); |
126 | memcpy (vec_wo, vec_wi, sizeof (fd_set)); |
153 | memcpy (vec_wo, vec_wi, fd_setsize); |
127 | #else |
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128 | memcpy (vec_ro, vec_ri, vec_max * NFDBYTES); |
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129 | memcpy (vec_wo, vec_wi, vec_max * NFDBYTES); |
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130 | #endif |
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131 | |
154 | |
132 | tv.tv_sec = (long)timeout; |
155 | #ifdef _WIN32 |
133 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
156 | /* pass in the write set as except set. |
134 | |
157 | * the idea behind this is to work around a windows bug that causes |
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158 | * errors to be reported as an exception and not by setting |
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159 | * the writable bit. this is so uncontrollably lame. |
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160 | */ |
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161 | memcpy (vec_eo, vec_wi, fd_setsize); |
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162 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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163 | #elif EV_SELECT_USE_FD_SET |
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164 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
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165 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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166 | #else |
135 | 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); |
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168 | #endif |
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169 | EV_ACQUIRE_CB; |
136 | |
170 | |
137 | if (res < 0) |
171 | if (expect_false (res < 0)) |
138 | { |
172 | { |
139 | #if EV_SELECT_IS_WINSOCKET |
173 | #if EV_SELECT_IS_WINSOCKET |
140 | errno = WSAGetLastError (); |
174 | errno = WSAGetLastError (); |
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175 | #endif |
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176 | #ifdef WSABASEERR |
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177 | /* on windows, select returns incompatible error codes, fix this */ |
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178 | if (errno >= WSABASEERR && errno < WSABASEERR + 1000) |
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179 | if (errno == WSAENOTSOCK) |
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180 | errno = EBADF; |
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181 | else |
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182 | errno -= WSABASEERR; |
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183 | #endif |
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184 | |
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185 | #ifdef _WIN32 |
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186 | /* select on windows erroneously returns EINVAL when no fd sets have been |
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187 | * provided (this is documented). what microsoft doesn't tell you that this bug |
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188 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
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189 | * here and emulate by sleeping manually. |
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190 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
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191 | * and assume that EINVAL always means: you have to wait manually. |
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192 | */ |
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193 | if (errno == EINVAL) |
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194 | { |
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195 | ev_sleep (timeout); |
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196 | return; |
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197 | } |
141 | #endif |
198 | #endif |
142 | |
199 | |
143 | if (errno == EBADF) |
200 | if (errno == EBADF) |
144 | fd_ebadf (EV_A); |
201 | fd_ebadf (EV_A); |
145 | else if (errno == ENOMEM && !syserr_cb) |
202 | else if (errno == ENOMEM && !syserr_cb) |
146 | fd_enomem (EV_A); |
203 | fd_enomem (EV_A); |
147 | else if (errno != EINTR) |
204 | else if (errno != EINTR) |
148 | syserr ("(libev) select"); |
205 | ev_syserr ("(libev) select"); |
149 | |
206 | |
150 | return; |
207 | return; |
151 | } |
208 | } |
152 | |
209 | |
153 | #if EV_SELECT_USE_FD_SET |
210 | #if EV_SELECT_USE_FD_SET |
… | |
… | |
165 | int handle = fd; |
222 | int handle = fd; |
166 | #endif |
223 | #endif |
167 | |
224 | |
168 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
225 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
169 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
226 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
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227 | #ifdef _WIN32 |
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228 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
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229 | #endif |
170 | |
230 | |
171 | if (events) |
231 | if (expect_true (events)) |
172 | fd_event (EV_A_ fd, events); |
232 | fd_event (EV_A_ fd, events); |
173 | } |
233 | } |
174 | } |
234 | } |
175 | |
235 | |
176 | #else |
236 | #else |
… | |
… | |
179 | int word, bit; |
239 | int word, bit; |
180 | for (word = vec_max; word--; ) |
240 | for (word = vec_max; word--; ) |
181 | { |
241 | { |
182 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
242 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
183 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
243 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
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244 | #ifdef _WIN32 |
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245 | word_w |= ((fd_mask *)vec_eo) [word]; |
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246 | #endif |
184 | |
247 | |
185 | if (word_r || word_w) |
248 | if (word_r || word_w) |
186 | for (bit = NFDBITS; bit--; ) |
249 | for (bit = NFDBITS; bit--; ) |
187 | { |
250 | { |
188 | fd_mask mask = 1UL << bit; |
251 | fd_mask mask = 1UL << bit; |
189 | int events = 0; |
252 | int events = 0; |
190 | |
253 | |
191 | events |= word_r & mask ? EV_READ : 0; |
254 | events |= word_r & mask ? EV_READ : 0; |
192 | events |= word_w & mask ? EV_WRITE : 0; |
255 | events |= word_w & mask ? EV_WRITE : 0; |
193 | |
256 | |
194 | if (events) |
257 | if (expect_true (events)) |
195 | fd_event (EV_A_ word * NFDBITS + bit, events); |
258 | fd_event (EV_A_ word * NFDBITS + bit, events); |
196 | } |
259 | } |
197 | } |
260 | } |
198 | } |
261 | } |
199 | |
262 | |
200 | #endif |
263 | #endif |
201 | } |
264 | } |
202 | |
265 | |
203 | static int |
266 | int inline_size |
204 | select_init (EV_P_ int flags) |
267 | select_init (EV_P_ int flags) |
205 | { |
268 | { |
206 | backend_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
269 | backend_fudge = 0.; /* posix says this is zero */ |
207 | backend_modify = select_modify; |
270 | backend_modify = select_modify; |
208 | backend_poll = select_poll; |
271 | backend_poll = select_poll; |
209 | |
272 | |
210 | #if EV_SELECT_USE_FD_SET |
273 | #if EV_SELECT_USE_FD_SET |
211 | vec_max = FD_SETSIZE / 32; |
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212 | 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); |
213 | vec_ro = ev_malloc (sizeof (fd_set)); |
275 | vec_ro = ev_malloc (sizeof (fd_set)); |
214 | 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); |
215 | vec_wo = ev_malloc (sizeof (fd_set)); |
277 | vec_wo = ev_malloc (sizeof (fd_set)); |
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278 | #ifdef _WIN32 |
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279 | vec_eo = ev_malloc (sizeof (fd_set)); |
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280 | #endif |
216 | #else |
281 | #else |
217 | vec_max = 0; |
282 | vec_max = 0; |
218 | vec_ri = 0; |
283 | vec_ri = 0; |
219 | vec_ri = 0; |
284 | vec_ro = 0; |
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285 | vec_wi = 0; |
220 | vec_wo = 0; |
286 | vec_wo = 0; |
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287 | #ifdef _WIN32 |
221 | vec_wo = 0; |
288 | vec_eo = 0; |
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289 | #endif |
222 | #endif |
290 | #endif |
223 | |
291 | |
224 | return EVBACKEND_SELECT; |
292 | return EVBACKEND_SELECT; |
225 | } |
293 | } |
226 | |
294 | |
227 | static void |
295 | void inline_size |
228 | select_destroy (EV_P) |
296 | select_destroy (EV_P) |
229 | { |
297 | { |
230 | ev_free (vec_ri); |
298 | ev_free (vec_ri); |
231 | ev_free (vec_ro); |
299 | ev_free (vec_ro); |
232 | ev_free (vec_wi); |
300 | ev_free (vec_wi); |
233 | 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 |
234 | } |
305 | } |
235 | |
306 | |
236 | |
307 | |