1 | /* |
1 | /* |
2 | iom.C -- generic I/O multiplexor |
2 | iom.C -- generic I/O multiplexer |
3 | Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003, 2004 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "iom.h" |
22 | #include "iom.h" |
21 | |
23 | |
… | |
… | |
33 | # include <time.h> |
35 | # include <time.h> |
34 | #endif |
36 | #endif |
35 | |
37 | |
36 | // for IOM_SIG |
38 | // for IOM_SIG |
37 | #if IOM_SIG |
39 | #if IOM_SIG |
38 | # include <signal.h> |
40 | # include <csignal> |
39 | # include <fcntl.h> |
41 | # include <fcntl.h> |
40 | #endif |
42 | #endif |
41 | |
43 | |
42 | // if the BSDs would at least be marginally POSIX-compatible.. *sigh* |
44 | // if the BSDs would at least be marginally POSIX-compatible.. *sigh* |
43 | // until that happens, sys/select.h must come last |
45 | // until that happens, sys/select.h must come last |
44 | #include <sys/select.h> |
46 | #include <sys/select.h> |
45 | |
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46 | // TSTAMP_MAX must still fit into a positive struct timeval |
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47 | #define TSTAMP_MAX (double)(1UL<<31) |
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48 | |
47 | |
49 | #define TIMEVAL timeval |
48 | #define TIMEVAL timeval |
50 | #define TV_FRAC tv_usec |
49 | #define TV_FRAC tv_usec |
51 | #define TV_MULT 1000000L |
50 | #define TV_MULT 1000000L |
52 | |
51 | |
… | |
… | |
94 | } tw0; |
93 | } tw0; |
95 | |
94 | |
96 | tstamp NOW; |
95 | tstamp NOW; |
97 | |
96 | |
98 | #if IOM_TIME |
97 | #if IOM_TIME |
99 | inline void set_now (void) |
98 | tstamp io_manager::now () |
100 | { |
99 | { |
101 | struct timeval tv; |
100 | struct timeval tv; |
102 | |
101 | |
103 | gettimeofday (&tv, 0); |
102 | gettimeofday (&tv, 0); |
104 | NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.; |
103 | return (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.; |
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104 | } |
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105 | |
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106 | void io_manager::set_now () |
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107 | { |
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108 | NOW = now (); |
105 | } |
109 | } |
106 | #endif |
110 | #endif |
107 | |
111 | |
108 | static bool iom_valid; |
112 | static bool iom_valid; |
109 | |
113 | |
… | |
… | |
118 | { |
122 | { |
119 | perror ("io_manager: unable to create signal pipe, aborting."); |
123 | perror ("io_manager: unable to create signal pipe, aborting."); |
120 | abort (); |
124 | abort (); |
121 | } |
125 | } |
122 | |
126 | |
123 | fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); |
127 | fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC); |
124 | fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); |
128 | fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC); |
125 | #endif |
129 | #endif |
126 | |
130 | |
127 | iom_valid = true; |
131 | iom_valid = true; |
128 | |
132 | |
129 | #if IOM_TIME |
133 | #if IOM_TIME |
130 | set_now (); |
134 | io_manager::set_now (); |
131 | |
135 | |
132 | tw0.start (TSTAMP_MAX); |
136 | tw0.start (TSTAMP_MAX); |
133 | #endif |
137 | #endif |
134 | } |
138 | } |
135 | |
139 | |
… | |
… | |
152 | { |
156 | { |
153 | init::required (); |
157 | init::required (); |
154 | |
158 | |
155 | if (!w.active) |
159 | if (!w.active) |
156 | { |
160 | { |
157 | #if IOM_CHECK |
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158 | queue.activity = true; |
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159 | #endif |
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160 | queue.push_back (&w); |
161 | queue.push_back (&w); |
161 | w.active = queue.size (); |
162 | w.active = queue.size (); |
162 | } |
163 | } |
163 | } |
164 | } |
164 | |
165 | |
… | |
… | |
273 | set_now (); |
274 | set_now (); |
274 | #endif |
275 | #endif |
275 | |
276 | |
276 | for (;;) |
277 | for (;;) |
277 | { |
278 | { |
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279 | |
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280 | #if IOM_TIME |
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281 | // call pending time watchers |
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282 | { |
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283 | bool activity; |
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284 | |
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285 | do |
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286 | { |
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287 | activity = false; |
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288 | |
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289 | for (int i = tw.size (); i--; ) |
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290 | if (!tw[i]) |
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291 | tw.erase_unordered (i); |
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292 | else if (tw[i]->at <= NOW) |
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293 | { |
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294 | time_watcher &w = *tw[i]; |
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295 | |
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296 | unreg (w); |
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297 | w.call (w); |
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298 | |
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299 | activity = true; |
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300 | } |
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301 | } |
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302 | while (activity); |
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303 | } |
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304 | #endif |
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305 | |
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306 | #if IOM_CHECK |
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307 | // call all check watchers |
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308 | for (int i = cw.size (); i--; ) |
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309 | if (!cw[i]) |
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310 | cw.erase_unordered (i); |
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311 | else |
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312 | cw[i]->call (*cw[i]); |
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313 | #endif |
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314 | |
278 | struct TIMEVAL *to = 0; |
315 | struct TIMEVAL *to = 0; |
279 | struct TIMEVAL tval; |
316 | struct TIMEVAL tval; |
280 | |
317 | |
281 | #if IOM_IDLE |
318 | #if IOM_IDLE |
282 | if (iw.size ()) |
319 | if (iw.size ()) |
… | |
… | |
287 | } |
324 | } |
288 | else |
325 | else |
289 | #endif |
326 | #endif |
290 | { |
327 | { |
291 | #if IOM_TIME |
328 | #if IOM_TIME |
292 | time_watcher *next; |
329 | // find earliest active watcher |
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330 | time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times |
293 | |
331 | |
294 | for (;;) |
332 | for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); ) |
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333 | if (*i && (*i)->at < next->at) |
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334 | next = *i; |
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335 | |
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336 | if (next->at > NOW && next != tw[0]) |
295 | { |
337 | { |
296 | next = tw[0]; // the first time-watcher must exist at ALL times |
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297 | |
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298 | for (int i = tw.size (); i--; ) |
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299 | if (!tw[i]) |
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300 | tw.erase_unordered (i); |
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301 | else if (tw[i]->at < next->at) |
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302 | next = tw[i]; |
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303 | |
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304 | if (next->at > NOW) |
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305 | { |
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306 | if (next != tw[0]) |
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307 | { |
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308 | double diff = next->at - NOW; |
338 | double diff = next->at - NOW; |
309 | tval.tv_sec = (int)diff; |
339 | tval.tv_sec = (int)diff; |
310 | tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT); |
340 | tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT); |
311 | to = &tval; |
341 | to = &tval; |
312 | } |
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313 | break; |
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314 | } |
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315 | else |
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316 | { |
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317 | unreg (*next); |
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318 | next->call (*next); |
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319 | } |
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320 | } |
342 | } |
321 | #endif |
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322 | } |
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323 | |
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324 | #if IOM_CHECK |
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325 | tw.activity = false; |
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326 | |
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327 | for (int i = cw.size (); i--; ) |
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328 | if (!cw[i]) |
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329 | cw.erase_unordered (i); |
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330 | else |
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331 | cw[i]->call (*cw[i]); |
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332 | |
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333 | if (tw.activity) |
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334 | { |
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335 | tval.tv_sec = 0; |
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336 | tval.TV_FRAC = 0; |
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337 | to = &tval; |
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338 | } |
343 | } |
339 | #endif |
344 | #endif |
340 | |
345 | |
341 | #if IOM_IO || IOM_SIG |
346 | #if IOM_IO || IOM_SIG |
342 | fd_set rfd, wfd; |
347 | fd_set rfd, wfd; |
… | |
… | |
345 | FD_ZERO (&wfd); |
350 | FD_ZERO (&wfd); |
346 | |
351 | |
347 | int fds = 0; |
352 | int fds = 0; |
348 | |
353 | |
349 | # if IOM_IO |
354 | # if IOM_IO |
350 | for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); ) |
355 | for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); ) |
351 | if (*i) |
356 | if (*i) |
352 | { |
357 | { |
353 | if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); |
358 | if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); |
354 | if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); |
359 | if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); |
355 | |
360 | |
356 | if ((*i)->fd >= fds) fds = (*i)->fd + 1; |
361 | if ((*i)->fd >= fds) fds = (*i)->fd + 1; |
357 | } |
362 | } |
358 | # endif |
363 | # endif |
359 | |
364 | |
360 | if (!to && !fds) //TODO: also check idle_watchers and check_watchers |
365 | if (!to && !fds) //TODO: also check idle_watchers and check_watchers? |
361 | break; // no events |
366 | break; // no events |
362 | |
367 | |
363 | # if IOM_SIG |
368 | # if IOM_SIG |
364 | FD_SET (sigpipe[0], &rfd); |
369 | FD_SET (sigpipe[0], &rfd); |
365 | if (sigpipe[0] >= fds) fds = sigpipe[0] + 1; |
370 | if (sigpipe[0] >= fds) fds = sigpipe[0] + 1; |
… | |
… | |
374 | # if IOM_SIG |
379 | # if IOM_SIG |
375 | sigprocmask (SIG_BLOCK, &sigs, NULL); |
380 | sigprocmask (SIG_BLOCK, &sigs, NULL); |
376 | # endif |
381 | # endif |
377 | |
382 | |
378 | # if IOM_TIME |
383 | # if IOM_TIME |
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384 | { |
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385 | // update time, try to compensate for gross non-monotonic time changes |
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386 | tstamp diff = NOW; |
379 | set_now (); |
387 | set_now (); |
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388 | diff = NOW - diff; |
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389 | |
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390 | if (diff < 0) |
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391 | for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); ) |
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392 | if (*i) |
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393 | (*i)->at += diff; |
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394 | } |
380 | # endif |
395 | # endif |
381 | |
396 | |
382 | if (fds > 0) |
397 | if (fds > 0) |
383 | { |
398 | { |
384 | # if IOM_SIG |
399 | # if IOM_SIG |
… | |
… | |
387 | char ch; |
402 | char ch; |
388 | |
403 | |
389 | while (read (sigpipe[0], &ch, 1) > 0) |
404 | while (read (sigpipe[0], &ch, 1) > 0) |
390 | ; |
405 | ; |
391 | |
406 | |
392 | for (sig_vec **svp = sw.end (); svp-- > sw.begin (); ) |
407 | for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); ) |
393 | if (*svp && (*svp)->pending) |
408 | if (*svp && (*svp)->pending) |
394 | { |
409 | { |
395 | sig_vec &sv = **svp; |
410 | sig_vec &sv = **svp; |
396 | for (int i = sv.size (); i--; ) |
411 | for (int i = sv.size (); i--; ) |
397 | if (!sv[i]) |
412 | if (!sv[i]) |
… | |
… | |
408 | for (int i = iow.size (); i--; ) |
423 | for (int i = iow.size (); i--; ) |
409 | if (!iow[i]) |
424 | if (!iow[i]) |
410 | iow.erase_unordered (i); |
425 | iow.erase_unordered (i); |
411 | else |
426 | else |
412 | { |
427 | { |
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428 | io_watcher &w = *iow[i]; |
413 | short revents = iow[i]->events; |
429 | short revents = w.events; |
414 | |
430 | |
415 | if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; |
431 | if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ; |
416 | if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; |
432 | if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE; |
417 | |
433 | |
418 | if (revents) |
434 | if (revents) |
419 | iow[i]->call (*iow[i], revents); |
435 | w.call (w, revents); |
420 | } |
436 | } |
421 | #endif |
437 | #endif |
422 | } |
438 | } |
423 | else if (fds < 0 && errno != EINTR) |
439 | else if (fds < 0 && errno != EINTR) |
424 | { |
440 | { |