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) 2007,2008,2009,2010,2011 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 | * |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
11 | * this list of conditions and the following disclaimer. |
11 | * this list of conditions and the following disclaimer. |
12 | * |
12 | * |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in the |
14 | * notice, this list of conditions and the following disclaimer in the |
15 | * documentation and/or other materials provided with the distribution. |
15 | * documentation and/or other materials provided with the distribution. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
… | |
… | |
37 | * either the BSD or the GPL. |
37 | * either the BSD or the GPL. |
38 | */ |
38 | */ |
39 | |
39 | |
40 | #ifndef _WIN32 |
40 | #ifndef _WIN32 |
41 | /* for unix systems */ |
41 | /* for unix systems */ |
42 | # include <sys/select.h> |
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43 | # include <inttypes.h> |
42 | # include <inttypes.h> |
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43 | # ifndef __hpux |
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44 | /* for REAL unix systems */ |
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45 | # include <sys/select.h> |
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46 | # endif |
44 | #endif |
47 | #endif |
45 | |
48 | |
46 | #ifndef EV_SELECT_USE_FD_SET |
49 | #ifndef EV_SELECT_USE_FD_SET |
47 | # ifdef NFDBITS |
50 | # ifdef NFDBITS |
48 | # define EV_SELECT_USE_FD_SET 0 |
51 | # define EV_SELECT_USE_FD_SET 0 |
… | |
… | |
76 | #if EV_SELECT_IS_WINSOCKET |
79 | #if EV_SELECT_IS_WINSOCKET |
77 | SOCKET handle = anfds [fd].handle; |
80 | SOCKET handle = anfds [fd].handle; |
78 | #else |
81 | #else |
79 | int handle = fd; |
82 | int handle = fd; |
80 | #endif |
83 | #endif |
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84 | |
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85 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
81 | |
86 | |
82 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
87 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
83 | * which eventually leads to overflows). Need to call it only on changes. |
88 | * which eventually leads to overflows). Need to call it only on changes. |
84 | */ |
89 | */ |
85 | #if EV_SELECT_IS_WINSOCKET |
90 | #if EV_SELECT_IS_WINSOCKET |
… | |
… | |
101 | #else |
106 | #else |
102 | |
107 | |
103 | int word = fd / NFDBITS; |
108 | int word = fd / NFDBITS; |
104 | fd_mask mask = 1UL << (fd % NFDBITS); |
109 | fd_mask mask = 1UL << (fd % NFDBITS); |
105 | |
110 | |
106 | if (expect_false (vec_max <= word)) |
111 | if (ecb_expect_false (vec_max <= word)) |
107 | { |
112 | { |
108 | int new_max = word + 1; |
113 | int new_max = word + 1; |
109 | |
114 | |
110 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
115 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
111 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
116 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
… | |
… | |
136 | { |
141 | { |
137 | struct timeval tv; |
142 | struct timeval tv; |
138 | int res; |
143 | int res; |
139 | int fd_setsize; |
144 | int fd_setsize; |
140 | |
145 | |
141 | tv.tv_sec = (long)timeout; |
146 | EV_RELEASE_CB; |
142 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
147 | EV_TV_SET (tv, timeout); |
143 | |
148 | |
144 | #if EV_SELECT_USE_FD_SET |
149 | #if EV_SELECT_USE_FD_SET |
145 | fd_setsize = sizeof (fd_set); |
150 | fd_setsize = sizeof (fd_set); |
146 | #else |
151 | #else |
147 | fd_setsize = vec_max * NFDBYTES; |
152 | fd_setsize = vec_max * NFDBYTES; |
… | |
… | |
156 | * errors to be reported as an exception and not by setting |
161 | * errors to be reported as an exception and not by setting |
157 | * the writable bit. this is so uncontrollably lame. |
162 | * the writable bit. this is so uncontrollably lame. |
158 | */ |
163 | */ |
159 | memcpy (vec_eo, vec_wi, fd_setsize); |
164 | memcpy (vec_eo, vec_wi, fd_setsize); |
160 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
165 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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166 | #elif EV_SELECT_USE_FD_SET |
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167 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
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168 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
161 | #else |
169 | #else |
162 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
170 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
163 | #endif |
171 | #endif |
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172 | EV_ACQUIRE_CB; |
164 | |
173 | |
165 | if (expect_false (res < 0)) |
174 | if (ecb_expect_false (res < 0)) |
166 | { |
175 | { |
167 | #if EV_SELECT_IS_WINSOCKET |
176 | #if EV_SELECT_IS_WINSOCKET |
168 | errno = WSAGetLastError (); |
177 | errno = WSAGetLastError (); |
169 | #endif |
178 | #endif |
170 | #ifdef WSABASEERR |
179 | #ifdef WSABASEERR |
… | |
… | |
175 | else |
184 | else |
176 | errno -= WSABASEERR; |
185 | errno -= WSABASEERR; |
177 | #endif |
186 | #endif |
178 | |
187 | |
179 | #ifdef _WIN32 |
188 | #ifdef _WIN32 |
180 | /* select on windows errornously returns EINVAL when no fd sets have been |
189 | /* select on windows erroneously returns EINVAL when no fd sets have been |
181 | * provided (this is documented). what microsoft doesn't tell you that this bug |
190 | * provided (this is documented). what microsoft doesn't tell you that this bug |
182 | * exists even when the fd sets are provided, so we have to check for this bug |
191 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
183 | * here and emulate by sleeping manually. |
192 | * here and emulate by sleeping manually. |
184 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
193 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
185 | * and assume that EINVAL always means: you have to wait manually. |
194 | * and assume that EINVAL always means: you have to wait manually. |
186 | */ |
195 | */ |
187 | if (errno == EINVAL) |
196 | if (errno == EINVAL) |
188 | { |
197 | { |
189 | ev_sleep (timeout); |
198 | if (timeout) |
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199 | { |
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200 | unsigned long ms = EV_TS_TO_MSEC (timeout); |
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201 | Sleep (ms ? ms : 1); |
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202 | } |
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203 | |
190 | return; |
204 | return; |
191 | } |
205 | } |
192 | #endif |
206 | #endif |
193 | |
207 | |
194 | if (errno == EBADF) |
208 | if (errno == EBADF) |
195 | fd_ebadf (EV_A); |
209 | fd_ebadf (EV_A); |
196 | else if (errno == ENOMEM && !syserr_cb) |
210 | else if (errno == ENOMEM && !syserr_cb) |
197 | fd_enomem (EV_A); |
211 | fd_enomem (EV_A); |
198 | else if (errno != EINTR) |
212 | else if (errno != EINTR) |
199 | syserr ("(libev) select"); |
213 | ev_syserr ("(libev) select"); |
200 | |
214 | |
201 | return; |
215 | return; |
202 | } |
216 | } |
203 | |
217 | |
204 | #if EV_SELECT_USE_FD_SET |
218 | #if EV_SELECT_USE_FD_SET |
… | |
… | |
220 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
234 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
221 | #ifdef _WIN32 |
235 | #ifdef _WIN32 |
222 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
236 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
223 | #endif |
237 | #endif |
224 | |
238 | |
225 | if (expect_true (events)) |
239 | if (ecb_expect_true (events)) |
226 | fd_event (EV_A_ fd, events); |
240 | fd_event (EV_A_ fd, events); |
227 | } |
241 | } |
228 | } |
242 | } |
229 | |
243 | |
230 | #else |
244 | #else |
… | |
… | |
246 | int events = 0; |
260 | int events = 0; |
247 | |
261 | |
248 | events |= word_r & mask ? EV_READ : 0; |
262 | events |= word_r & mask ? EV_READ : 0; |
249 | events |= word_w & mask ? EV_WRITE : 0; |
263 | events |= word_w & mask ? EV_WRITE : 0; |
250 | |
264 | |
251 | if (expect_true (events)) |
265 | if (ecb_expect_true (events)) |
252 | fd_event (EV_A_ word * NFDBITS + bit, events); |
266 | fd_event (EV_A_ word * NFDBITS + bit, events); |
253 | } |
267 | } |
254 | } |
268 | } |
255 | } |
269 | } |
256 | |
270 | |
257 | #endif |
271 | #endif |
258 | } |
272 | } |
259 | |
273 | |
260 | int inline_size |
274 | inline_size |
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275 | int |
261 | select_init (EV_P_ int flags) |
276 | select_init (EV_P_ int flags) |
262 | { |
277 | { |
263 | backend_fudge = 0.; /* posix says this is zero */ |
278 | backend_mintime = EV_TS_CONST (1e-6); |
264 | backend_modify = select_modify; |
279 | backend_modify = select_modify; |
265 | backend_poll = select_poll; |
280 | backend_poll = select_poll; |
266 | |
281 | |
267 | #if EV_SELECT_USE_FD_SET |
282 | #if EV_SELECT_USE_FD_SET |
268 | vec_max = FD_SETSIZE / 32; |
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269 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
283 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
270 | vec_ro = ev_malloc (sizeof (fd_set)); |
284 | vec_ro = ev_malloc (sizeof (fd_set)); |
271 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
285 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
272 | vec_wo = ev_malloc (sizeof (fd_set)); |
286 | vec_wo = ev_malloc (sizeof (fd_set)); |
273 | #ifdef _WIN32 |
287 | #ifdef _WIN32 |
274 | vec_eo = ev_malloc (sizeof (fd_set)); |
288 | vec_eo = ev_malloc (sizeof (fd_set)); |
275 | #endif |
289 | #endif |
276 | #else |
290 | #else |
277 | vec_max = 0; |
291 | vec_max = 0; |
278 | vec_ri = 0; |
292 | vec_ri = 0; |
279 | vec_ri = 0; |
293 | vec_ro = 0; |
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294 | vec_wi = 0; |
280 | vec_wo = 0; |
295 | vec_wo = 0; |
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296 | #ifdef _WIN32 |
281 | vec_wo = 0; |
297 | vec_eo = 0; |
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298 | #endif |
282 | #endif |
299 | #endif |
283 | |
300 | |
284 | return EVBACKEND_SELECT; |
301 | return EVBACKEND_SELECT; |
285 | } |
302 | } |
286 | |
303 | |
287 | void inline_size |
304 | inline_size |
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305 | void |
288 | select_destroy (EV_P) |
306 | select_destroy (EV_P) |
289 | { |
307 | { |
290 | ev_free (vec_ri); |
308 | ev_free (vec_ri); |
291 | ev_free (vec_ro); |
309 | ev_free (vec_ro); |
292 | ev_free (vec_wi); |
310 | ev_free (vec_wi); |
293 | ev_free (vec_wo); |
311 | ev_free (vec_wo); |
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312 | #ifdef _WIN32 |
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313 | ev_free (vec_eo); |
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314 | #endif |
294 | } |
315 | } |
295 | |
316 | |
296 | |
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