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 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 |
… | |
… | |
52 | #endif |
55 | #endif |
53 | |
56 | |
54 | #if EV_SELECT_IS_WINSOCKET |
57 | #if EV_SELECT_IS_WINSOCKET |
55 | # undef EV_SELECT_USE_FD_SET |
58 | # undef EV_SELECT_USE_FD_SET |
56 | # define EV_SELECT_USE_FD_SET 1 |
59 | # define EV_SELECT_USE_FD_SET 1 |
|
|
60 | # undef NFDBITS |
|
|
61 | # define NFDBITS 0 |
57 | #endif |
62 | #endif |
58 | |
63 | |
59 | #if !EV_SELECT_USE_FD_SET |
64 | #if !EV_SELECT_USE_FD_SET |
60 | # define NFDBYTES (NFDBITS / 8) |
65 | # define NFDBYTES (NFDBITS / 8) |
61 | #endif |
66 | #endif |
… | |
… | |
75 | SOCKET handle = anfds [fd].handle; |
80 | SOCKET handle = anfds [fd].handle; |
76 | #else |
81 | #else |
77 | int handle = fd; |
82 | int handle = fd; |
78 | #endif |
83 | #endif |
79 | |
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 |
80 | if (nev & EV_READ) |
93 | if (nev & EV_READ) |
81 | FD_SET (handle, (fd_set *)vec_ri); |
94 | FD_SET (handle, (fd_set *)vec_ri); |
82 | else |
95 | else |
83 | FD_CLR (handle, (fd_set *)vec_ri); |
96 | FD_CLR (handle, (fd_set *)vec_ri); |
84 | |
97 | |
|
|
98 | #if EV_SELECT_IS_WINSOCKET |
|
|
99 | if ((oev ^ nev) & EV_WRITE) |
|
|
100 | #endif |
85 | if (nev & EV_WRITE) |
101 | if (nev & EV_WRITE) |
86 | FD_SET (handle, (fd_set *)vec_wi); |
102 | FD_SET (handle, (fd_set *)vec_wi); |
87 | else |
103 | else |
88 | FD_CLR (handle, (fd_set *)vec_wi); |
104 | FD_CLR (handle, (fd_set *)vec_wi); |
89 | |
105 | |
90 | #else |
106 | #else |
91 | |
107 | |
92 | int word = fd / NFDBITS; |
108 | int word = fd / NFDBITS; |
93 | fd_mask mask = 1UL << (fd % NFDBITS); |
109 | fd_mask mask = 1UL << (fd % NFDBITS); |
… | |
… | |
125 | { |
141 | { |
126 | struct timeval tv; |
142 | struct timeval tv; |
127 | int res; |
143 | int res; |
128 | int fd_setsize; |
144 | int fd_setsize; |
129 | |
145 | |
130 | tv.tv_sec = (long)timeout; |
146 | EV_RELEASE_CB; |
131 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
147 | EV_TV_SET (tv, timeout); |
132 | |
148 | |
133 | #if EV_SELECT_USE_FD_SET |
149 | #if EV_SELECT_USE_FD_SET |
134 | fd_setsize = sizeof (fd_set); |
150 | fd_setsize = sizeof (fd_set); |
135 | #else |
151 | #else |
136 | fd_setsize = vec_max * NFDBYTES; |
152 | fd_setsize = vec_max * NFDBYTES; |
… | |
… | |
145 | * errors to be reported as an exception and not by setting |
161 | * errors to be reported as an exception and not by setting |
146 | * the writable bit. this is so uncontrollably lame. |
162 | * the writable bit. this is so uncontrollably lame. |
147 | */ |
163 | */ |
148 | memcpy (vec_eo, vec_wi, fd_setsize); |
164 | 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); |
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); |
150 | #else |
169 | #else |
151 | 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); |
152 | #endif |
171 | #endif |
|
|
172 | EV_ACQUIRE_CB; |
153 | |
173 | |
154 | if (expect_false (res < 0)) |
174 | if (expect_false (res < 0)) |
155 | { |
175 | { |
156 | #if EV_SELECT_IS_WINSOCKET |
176 | #if EV_SELECT_IS_WINSOCKET |
157 | errno = WSAGetLastError (); |
177 | errno = WSAGetLastError (); |
… | |
… | |
164 | else |
184 | else |
165 | errno -= WSABASEERR; |
185 | errno -= WSABASEERR; |
166 | #endif |
186 | #endif |
167 | |
187 | |
168 | #ifdef _WIN32 |
188 | #ifdef _WIN32 |
169 | /* 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 |
170 | * 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 |
171 | * 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 |
172 | * here and emulate by sleeping manually. |
192 | * here and emulate by sleeping manually. |
173 | * 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 |
174 | * and assume that EINVAL always means: you have to wait manually. |
194 | * and assume that EINVAL always means: you have to wait manually. |
175 | */ |
195 | */ |
176 | if (errno == EINVAL) |
196 | if (errno == EINVAL) |
177 | { |
197 | { |
178 | ev_sleep (timeout); |
198 | if (timeout) |
|
|
199 | { |
|
|
200 | unsigned long ms = timeout * 1e3; |
|
|
201 | Sleep (ms ? ms : 1); |
|
|
202 | } |
|
|
203 | |
179 | return; |
204 | return; |
180 | } |
205 | } |
181 | #endif |
206 | #endif |
182 | |
207 | |
183 | if (errno == EBADF) |
208 | if (errno == EBADF) |
184 | fd_ebadf (EV_A); |
209 | fd_ebadf (EV_A); |
185 | else if (errno == ENOMEM && !syserr_cb) |
210 | else if (errno == ENOMEM && !syserr_cb) |
186 | fd_enomem (EV_A); |
211 | fd_enomem (EV_A); |
187 | else if (errno != EINTR) |
212 | else if (errno != EINTR) |
188 | syserr ("(libev) select"); |
213 | ev_syserr ("(libev) select"); |
189 | |
214 | |
190 | return; |
215 | return; |
191 | } |
216 | } |
192 | |
217 | |
193 | #if EV_SELECT_USE_FD_SET |
218 | #if EV_SELECT_USE_FD_SET |
… | |
… | |
223 | for (word = vec_max; word--; ) |
248 | for (word = vec_max; word--; ) |
224 | { |
249 | { |
225 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
250 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
226 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
251 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
227 | #ifdef _WIN32 |
252 | #ifdef _WIN32 |
228 | word_r |= ((fd_mask *)vec_eo) [word]; |
|
|
229 | word_w |= ((fd_mask *)vec_eo) [word]; |
253 | word_w |= ((fd_mask *)vec_eo) [word]; |
230 | #endif |
254 | #endif |
231 | |
255 | |
232 | if (word_r || word_w) |
256 | if (word_r || word_w) |
233 | for (bit = NFDBITS; bit--; ) |
257 | for (bit = NFDBITS; bit--; ) |
… | |
… | |
248 | } |
272 | } |
249 | |
273 | |
250 | int inline_size |
274 | int inline_size |
251 | select_init (EV_P_ int flags) |
275 | select_init (EV_P_ int flags) |
252 | { |
276 | { |
253 | backend_fudge = 0.; /* posix says this is zero */ |
277 | backend_fudge = 1e-6; |
254 | backend_modify = select_modify; |
278 | backend_modify = select_modify; |
255 | backend_poll = select_poll; |
279 | backend_poll = select_poll; |
256 | |
280 | |
257 | #if EV_SELECT_USE_FD_SET |
281 | #if EV_SELECT_USE_FD_SET |
258 | vec_max = FD_SETSIZE / 32; |
|
|
259 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
282 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
260 | vec_ro = ev_malloc (sizeof (fd_set)); |
283 | vec_ro = ev_malloc (sizeof (fd_set)); |
261 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
284 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
262 | vec_wo = ev_malloc (sizeof (fd_set)); |
285 | vec_wo = ev_malloc (sizeof (fd_set)); |
263 | #ifdef _WIN32 |
286 | #ifdef _WIN32 |
264 | vec_eo = ev_malloc (sizeof (fd_set)); |
287 | vec_eo = ev_malloc (sizeof (fd_set)); |
265 | #endif |
288 | #endif |
266 | #else |
289 | #else |
267 | vec_max = 0; |
290 | vec_max = 0; |
268 | vec_ri = 0; |
291 | vec_ri = 0; |
269 | vec_ri = 0; |
292 | vec_ro = 0; |
|
|
293 | vec_wi = 0; |
270 | vec_wo = 0; |
294 | vec_wo = 0; |
|
|
295 | #ifdef _WIN32 |
271 | vec_wo = 0; |
296 | vec_eo = 0; |
|
|
297 | #endif |
272 | #endif |
298 | #endif |
273 | |
299 | |
274 | return EVBACKEND_SELECT; |
300 | return EVBACKEND_SELECT; |
275 | } |
301 | } |
276 | |
302 | |
… | |
… | |
279 | { |
305 | { |
280 | ev_free (vec_ri); |
306 | ev_free (vec_ri); |
281 | ev_free (vec_ro); |
307 | ev_free (vec_ro); |
282 | ev_free (vec_wi); |
308 | ev_free (vec_wi); |
283 | ev_free (vec_wo); |
309 | ev_free (vec_wo); |
|
|
310 | #ifdef _WIN32 |
|
|
311 | ev_free (vec_eo); |
|
|
312 | #endif |
284 | } |
313 | } |
285 | |
314 | |
286 | |
|
|