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> |
|
|
43 | # include <inttypes.h> |
42 | # include <inttypes.h> |
|
|
43 | # ifndef __hpux |
|
|
44 | /* for REAL unix systems */ |
|
|
45 | # include <sys/select.h> |
|
|
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 |
… | |
… | |
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 |
81 | |
84 | |
|
|
85 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
|
|
86 | |
|
|
87 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
|
|
88 | * which eventually leads to overflows). Need to call it only on changes. |
|
|
89 | */ |
|
|
90 | #if EV_SELECT_IS_WINSOCKET |
|
|
91 | if ((oev ^ nev) & EV_READ) |
|
|
92 | #endif |
82 | if (nev & EV_READ) |
93 | if (nev & EV_READ) |
83 | FD_SET (handle, (fd_set *)vec_ri); |
94 | FD_SET (handle, (fd_set *)vec_ri); |
84 | else |
95 | else |
85 | FD_CLR (handle, (fd_set *)vec_ri); |
96 | FD_CLR (handle, (fd_set *)vec_ri); |
86 | |
97 | |
|
|
98 | #if EV_SELECT_IS_WINSOCKET |
|
|
99 | if ((oev ^ nev) & EV_WRITE) |
|
|
100 | #endif |
87 | if (nev & EV_WRITE) |
101 | if (nev & EV_WRITE) |
88 | FD_SET (handle, (fd_set *)vec_wi); |
102 | FD_SET (handle, (fd_set *)vec_wi); |
89 | else |
103 | else |
90 | FD_CLR (handle, (fd_set *)vec_wi); |
104 | FD_CLR (handle, (fd_set *)vec_wi); |
91 | |
105 | |
92 | #else |
106 | #else |
93 | |
107 | |
94 | int word = fd / NFDBITS; |
108 | int word = fd / NFDBITS; |
95 | fd_mask mask = 1UL << (fd % NFDBITS); |
109 | fd_mask mask = 1UL << (fd % NFDBITS); |
96 | |
110 | |
97 | if (expect_false (vec_max <= word)) |
111 | if (ecb_expect_false (vec_max <= word)) |
98 | { |
112 | { |
99 | int new_max = word + 1; |
113 | int new_max = word + 1; |
100 | |
114 | |
101 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
115 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
102 | 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 */ |
… | |
… | |
127 | { |
141 | { |
128 | struct timeval tv; |
142 | struct timeval tv; |
129 | int res; |
143 | int res; |
130 | int fd_setsize; |
144 | int fd_setsize; |
131 | |
145 | |
132 | tv.tv_sec = (long)timeout; |
146 | EV_RELEASE_CB; |
133 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
147 | EV_TV_SET (tv, timeout); |
134 | |
148 | |
135 | #if EV_SELECT_USE_FD_SET |
149 | #if EV_SELECT_USE_FD_SET |
136 | fd_setsize = sizeof (fd_set); |
150 | fd_setsize = sizeof (fd_set); |
137 | #else |
151 | #else |
138 | fd_setsize = vec_max * NFDBYTES; |
152 | fd_setsize = vec_max * NFDBYTES; |
… | |
… | |
147 | * errors to be reported as an exception and not by setting |
161 | * errors to be reported as an exception and not by setting |
148 | * the writable bit. this is so uncontrollably lame. |
162 | * the writable bit. this is so uncontrollably lame. |
149 | */ |
163 | */ |
150 | memcpy (vec_eo, vec_wi, fd_setsize); |
164 | memcpy (vec_eo, vec_wi, fd_setsize); |
151 | 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); |
|
|
166 | #elif EV_SELECT_USE_FD_SET |
|
|
167 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
|
|
168 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
152 | #else |
169 | #else |
153 | 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); |
154 | #endif |
171 | #endif |
|
|
172 | EV_ACQUIRE_CB; |
155 | |
173 | |
156 | if (expect_false (res < 0)) |
174 | if (ecb_expect_false (res < 0)) |
157 | { |
175 | { |
158 | #if EV_SELECT_IS_WINSOCKET |
176 | #if EV_SELECT_IS_WINSOCKET |
159 | errno = WSAGetLastError (); |
177 | errno = WSAGetLastError (); |
160 | #endif |
178 | #endif |
161 | #ifdef WSABASEERR |
179 | #ifdef WSABASEERR |
… | |
… | |
166 | else |
184 | else |
167 | errno -= WSABASEERR; |
185 | errno -= WSABASEERR; |
168 | #endif |
186 | #endif |
169 | |
187 | |
170 | #ifdef _WIN32 |
188 | #ifdef _WIN32 |
171 | /* 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 |
172 | * 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 |
173 | * 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 |
174 | * here and emulate by sleeping manually. |
192 | * here and emulate by sleeping manually. |
175 | * 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 |
176 | * and assume that EINVAL always means: you have to wait manually. |
194 | * and assume that EINVAL always means: you have to wait manually. |
177 | */ |
195 | */ |
178 | if (errno == EINVAL) |
196 | if (errno == EINVAL) |
179 | { |
197 | { |
180 | ev_sleep (timeout); |
198 | if (timeout) |
|
|
199 | { |
|
|
200 | unsigned long ms = EV_TS_TO_MSEC (timeout); |
|
|
201 | Sleep (ms ? ms : 1); |
|
|
202 | } |
|
|
203 | |
181 | return; |
204 | return; |
182 | } |
205 | } |
183 | #endif |
206 | #endif |
184 | |
207 | |
185 | if (errno == EBADF) |
208 | if (errno == EBADF) |
186 | fd_ebadf (EV_A); |
209 | fd_ebadf (EV_A); |
187 | else if (errno == ENOMEM && !syserr_cb) |
210 | else if (errno == ENOMEM && !syserr_cb) |
188 | fd_enomem (EV_A); |
211 | fd_enomem (EV_A); |
189 | else if (errno != EINTR) |
212 | else if (errno != EINTR) |
190 | syserr ("(libev) select"); |
213 | ev_syserr ("(libev) select"); |
191 | |
214 | |
192 | return; |
215 | return; |
193 | } |
216 | } |
194 | |
217 | |
195 | #if EV_SELECT_USE_FD_SET |
218 | #if EV_SELECT_USE_FD_SET |
… | |
… | |
211 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
234 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
212 | #ifdef _WIN32 |
235 | #ifdef _WIN32 |
213 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
236 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
214 | #endif |
237 | #endif |
215 | |
238 | |
216 | if (expect_true (events)) |
239 | if (ecb_expect_true (events)) |
217 | fd_event (EV_A_ fd, events); |
240 | fd_event (EV_A_ fd, events); |
218 | } |
241 | } |
219 | } |
242 | } |
220 | |
243 | |
221 | #else |
244 | #else |
… | |
… | |
237 | int events = 0; |
260 | int events = 0; |
238 | |
261 | |
239 | events |= word_r & mask ? EV_READ : 0; |
262 | events |= word_r & mask ? EV_READ : 0; |
240 | events |= word_w & mask ? EV_WRITE : 0; |
263 | events |= word_w & mask ? EV_WRITE : 0; |
241 | |
264 | |
242 | if (expect_true (events)) |
265 | if (ecb_expect_true (events)) |
243 | fd_event (EV_A_ word * NFDBITS + bit, events); |
266 | fd_event (EV_A_ word * NFDBITS + bit, events); |
244 | } |
267 | } |
245 | } |
268 | } |
246 | } |
269 | } |
247 | |
270 | |
248 | #endif |
271 | #endif |
249 | } |
272 | } |
250 | |
273 | |
251 | int inline_size |
274 | inline_size |
|
|
275 | int |
252 | select_init (EV_P_ int flags) |
276 | select_init (EV_P_ int flags) |
253 | { |
277 | { |
254 | backend_fudge = 0.; /* posix says this is zero */ |
278 | backend_mintime = EV_TS_CONST (1e-6); |
255 | backend_modify = select_modify; |
279 | backend_modify = select_modify; |
256 | backend_poll = select_poll; |
280 | backend_poll = select_poll; |
257 | |
281 | |
258 | #if EV_SELECT_USE_FD_SET |
282 | #if EV_SELECT_USE_FD_SET |
259 | vec_max = FD_SETSIZE / 32; |
|
|
260 | 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); |
261 | vec_ro = ev_malloc (sizeof (fd_set)); |
284 | vec_ro = ev_malloc (sizeof (fd_set)); |
262 | 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); |
263 | vec_wo = ev_malloc (sizeof (fd_set)); |
286 | vec_wo = ev_malloc (sizeof (fd_set)); |
264 | #ifdef _WIN32 |
287 | #ifdef _WIN32 |
265 | vec_eo = ev_malloc (sizeof (fd_set)); |
288 | vec_eo = ev_malloc (sizeof (fd_set)); |
266 | #endif |
289 | #endif |
267 | #else |
290 | #else |
268 | vec_max = 0; |
291 | vec_max = 0; |
269 | vec_ri = 0; |
292 | vec_ri = 0; |
270 | vec_ri = 0; |
293 | vec_ro = 0; |
|
|
294 | vec_wi = 0; |
271 | vec_wo = 0; |
295 | vec_wo = 0; |
|
|
296 | #ifdef _WIN32 |
272 | vec_wo = 0; |
297 | vec_eo = 0; |
|
|
298 | #endif |
273 | #endif |
299 | #endif |
274 | |
300 | |
275 | return EVBACKEND_SELECT; |
301 | return EVBACKEND_SELECT; |
276 | } |
302 | } |
277 | |
303 | |
278 | void inline_size |
304 | inline_size |
|
|
305 | void |
279 | select_destroy (EV_P) |
306 | select_destroy (EV_P) |
280 | { |
307 | { |
281 | ev_free (vec_ri); |
308 | ev_free (vec_ri); |
282 | ev_free (vec_ro); |
309 | ev_free (vec_ro); |
283 | ev_free (vec_wi); |
310 | ev_free (vec_wi); |
284 | ev_free (vec_wo); |
311 | ev_free (vec_wo); |
|
|
312 | #ifdef _WIN32 |
|
|
313 | ev_free (vec_eo); |
|
|
314 | #endif |
285 | } |
315 | } |
286 | |
316 | |
287 | |
|
|