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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.29 by root, Tue Apr 26 00:35:00 2005 UTC vs.
Revision 1.38 by root, Thu Oct 25 10:44:14 2007 UTC

1/* 1/*
2 iom.C -- generic I/O multiplexer 2 iom.C -- generic I/O multiplexer
3 Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com> 3 Copyright (C) 2003-2006 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE.
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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18*/ 20*/
19 21
20#include "iom.h" 22#include "iom.h"
21 23
22#include <cstdio> 24#include <cstdio>
23#include <cstdlib> 25#include <cstdlib>
24#include <cerrno> 26#include <cerrno>
27#include <cassert>
25 28
29#include <sys/types.h>
26#include <sys/time.h> 30#include <sys/time.h>
27
28#include <assert.h>
29 31
30#if 1 // older unices need these includes for select (2) 32#if 1 // older unices need these includes for select (2)
31# include <unistd.h> 33# include <unistd.h>
32# include <sys/types.h>
33# include <time.h> 34# include <time.h>
34#endif 35#endif
35 36
36// for IOM_SIG 37#if IOM_CHILD
38# include <sys/wait.h>
39#endif
40
37#if IOM_SIG 41#if IOM_SIG
38# include <csignal> 42# include <csignal>
39# include <fcntl.h> 43# include <fcntl.h>
40#endif 44#endif
41 45
42// if the BSDs would at least be marginally POSIX-compatible.. *sigh* 46// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
43// until that happens, sys/select.h must come last 47// until that happens, sys/select.h must come last
44#include <sys/select.h> 48#include <sys/select.h>
45 49
46// TSTAMP_MAX must still fit into a positive struct timeval
47#define TSTAMP_MAX (double)(1UL<<31)
48
49#define TIMEVAL timeval 50#define TIMEVAL timeval
50#define TV_FRAC tv_usec 51#define TV_FRAC tv_usec
51#define TV_MULT 1000000L 52#define TV_MULT 1000000L
52 53
54#ifndef IOM_LIBEVENT
53#if IOM_IO 55#if IOM_IO
54static io_manager_vec<io_watcher> iow; 56static io_manager_vec<io_watcher> iow;
55#endif 57#endif
58#if IOM_TIME
59static io_manager_vec<time_watcher> tw;
60#endif
61#endif
62
56#if IOM_CHECK 63#if IOM_CHECK
57static io_manager_vec<check_watcher> cw; 64static io_manager_vec<check_watcher> cw;
58#endif 65#endif
59#if IOM_TIME
60static io_manager_vec<time_watcher> tw;
61#endif
62#if IOM_IDLE 66#if IOM_IDLE
63static io_manager_vec<idle_watcher> iw; 67static io_manager_vec<idle_watcher> iw;
64#endif 68#endif
69
65#if IOM_SIG 70#if IOM_SIG
66static int sigpipe[2]; // signal signalling pipe 71static int sigpipe[2]; // signal signalling pipe
67static sigset_t sigs; 72static sigset_t sigs;
68struct sig_vec : io_manager_vec<sig_watcher> { 73struct sig_vec : io_manager_vec<sig_watcher> {
69 int pending; 74 int pending;
… …
72 { } 77 { }
73}; 78};
74static vector<sig_vec *> sw; 79static vector<sig_vec *> sw;
75#endif 80#endif
76 81
82#if IOM_CHILD
83static io_manager_vec<child_watcher> pw;
84#endif
85
77// this is a dummy time watcher to ensure that the first 86// this is a dummy time watcher to ensure that the first
78// time watcher is _always_ valid, this gets rid of a lot 87// time watcher is _always_ valid, this gets rid of a lot
79// of null-pointer-checks 88// of null-pointer-checks
80// (must come _before_ iom is being defined) 89// (must come _before_ iom is being defined)
81static struct tw0 : time_watcher 90static struct tw0 : time_watcher
91{
92 void cb (time_watcher &w)
82 { 93 {
83 void cb (time_watcher &w)
84 {
85 // should never get called 94 // should never get called
86 // reached end-of-time, or tstamp has a bogus definition, 95 // reached end-of-time, or tstamp has a bogus definition,
87 // or compiler initialisation order broken, or something else :) 96 // or compiler initialisation order broken, or something else :)
88 abort (); 97 abort ();
89 } 98 }
90 99
91 tw0 () 100 tw0 ()
92 : time_watcher (this, &tw0::cb) 101 : time_watcher (this, &tw0::cb)
93 { } 102 { }
94 } tw0; 103} tw0;
95 104
96tstamp NOW; 105tstamp NOW;
106
107#if IOM_CHILD
108// sig_watcher for child signal(s)
109static struct sw0 : sig_watcher
110{
111 void cb (sig_watcher &w)
112 {
113 // SIGCHLD, call corresponding watchera
114 pid_t pid;
115 int status;
116
117 while ((pid = waitpid (-1, &status, WNOHANG)) > 0)
118 for (int i = pw.size (); i--; )
119 {
120 child_watcher *w = pw[i];
121
122 if (!w)
123 pw.erase_unordered (i);
124 else if (w->pid == pid)
125 {
126 io_manager::unreg (*w);
127 w->call (*w, status);
128 }
129 }
130 }
131
132 sw0 ()
133 : sig_watcher (this, &sw0::cb)
134 { }
135} sw0;
136#endif
97 137
98#if IOM_TIME 138#if IOM_TIME
99tstamp io_manager::now () 139tstamp io_manager::now ()
100{ 140{
101 struct timeval tv; 141 struct timeval tv;
… …
114 154
115// used for initialisation only 155// used for initialisation only
116static struct init { 156static struct init {
117 init () 157 init ()
118 { 158 {
159#ifdef IOM_PREINIT
160 { IOM_PREINIT }
161#endif
162#ifdef IOM_LIBEVENT
163 event_init ();
164#endif
165 iom_valid = true;
166
119#if IOM_SIG 167#if IOM_SIG
120 sigemptyset (&sigs); 168 sigemptyset (&sigs);
121 169
122 if (pipe (sigpipe)) 170 if (pipe (sigpipe))
123 { 171 {
… …
127 175
128 fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC); 176 fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC);
129 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC); 177 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC);
130#endif 178#endif
131 179
132 iom_valid = true; 180#if IOM_CHILD
181 sw0.start (SIGCHLD);
182#endif
133 183
134#if IOM_TIME 184#if IOM_TIME
135 io_manager::set_now (); 185 io_manager::set_now ();
136 186
137 tw0.start (TSTAMP_MAX); 187 tw0.start (TSTAMP_MAX);
138#endif 188#endif
189
190#ifdef IOM_POSTINIT
191 { IOM_POSTINIT }
192#endif
193 }
194
195 ~init ()
196 {
197 iom_valid = false;
139 } 198 }
140 199
141 static void required (); 200 static void required ();
142} init; 201} init;
143 202
… …
176 w.active = 0; 235 w.active = 0;
177 } 236 }
178} 237}
179 238
180#if IOM_TIME 239#if IOM_TIME
240# ifdef IOM_LIBEVENT
241 void iom_time_c_callback (int fd, short events, void *data)
242 {
243 time_watcher *w = static_cast<time_watcher *>(data);
244 w->call (*w);
245 }
246# else
247 void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
248 void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
249# endif
250
181void time_watcher::trigger () 251void time_watcher::trigger ()
182{ 252{
183 call (*this); 253 call (*this);
184 io_manager::reg (*this); 254 start ();
185} 255}
186
187void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
188void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
189#endif 256#endif
190 257
191#if IOM_IO 258#if IOM_IO
259# ifdef IOM_LIBEVENT
260 void iom_io_c_callback (int fd, short events, void *data)
261 {
262 io_watcher *w = static_cast<io_watcher *>(data);
263 w->call (*w, events);
264 }
265# else
192void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); } 266 void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
193void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); } 267 void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
268# endif
194#endif 269#endif
195 270
196#if IOM_CHECK 271#if IOM_CHECK
197void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); } 272void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
198void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); } 273void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
… …
215 write (sigpipe[1], &ch, 1); 290 write (sigpipe[1], &ch, 1);
216} 291}
217 292
218void io_manager::reg (sig_watcher &w) 293void io_manager::reg (sig_watcher &w)
219{ 294{
295 init::required ();
296
220 assert (0 < w.signum); 297 assert (0 < w.signum);
221 298
222 sw.reserve (w.signum); 299 sw.reserve (w.signum);
223 300
224 while (sw.size () < w.signum) // pathetic 301 while (sw.size () < w.signum) // pathetic
… …
249 io_manager::reg (w, *sv); 326 io_manager::reg (w, *sv);
250} 327}
251 328
252void io_manager::unreg (sig_watcher &w) 329void io_manager::unreg (sig_watcher &w)
253{ 330{
254 if (!w.active) 331 if (!w.active || !iom_valid)
255 return; 332 return;
256 333
257 assert (0 < w.signum && w.signum <= sw.size ()); 334 assert (0 < w.signum && w.signum <= sw.size ());
258 335
259 io_manager::unreg (w, *sw[w.signum - 1]); 336 io_manager::unreg (w, *sw[w.signum - 1]);
… …
265 this->signum = signum; 342 this->signum = signum;
266 io_manager::reg (*this); 343 io_manager::reg (*this);
267} 344}
268#endif 345#endif
269 346
347#if IOM_CHILD
348void io_manager::reg (child_watcher &w) { io_manager::reg (w, pw); }
349void io_manager::unreg (child_watcher &w) { io_manager::unreg (w, pw); }
350#endif
351
270void io_manager::loop () 352void io_manager::loop ()
271{ 353{
272 init::required (); 354 init::required ();
273 355
274#if IOM_TIME 356 #if IOM_TIME
275 set_now (); 357 set_now ();
276#endif 358 #endif
277 359
278 for (;;) 360 for (;;)
279 { 361 {
280 362 #ifndef IOM_LIBEVENT
281#if IOM_TIME 363 #if IOM_TIME
282 // call pending time watchers 364 // call pending time watchers
283 { 365 {
284 bool activity; 366 bool activity;
285 367
286 do 368 do
287 { 369 {
288 activity = false; 370 activity = false;
289 371
290 for (int i = tw.size (); i--; ) 372 for (int i = tw.size (); i--; )
291 if (!tw[i]) 373 if (!tw[i])
292 tw.erase_unordered (i); 374 tw.erase_unordered (i);
293 else if (tw[i]->at <= NOW) 375 else if (tw[i]->at <= NOW)
294 { 376 {
295 time_watcher &w = *tw[i]; 377 time_watcher &w = *tw[i];
378
379 unreg (w);
380 w.call (w);
381
382 activity = true;
296 383 }
297 unreg (w);
298 w.call (w);
299
300 activity = true;
301 }
302 } 384 }
303 while (activity); 385 while (activity);
304 } 386 }
305#endif 387 #endif
388 #endif
306 389
307#if IOM_CHECK 390 #if IOM_CHECK
308 // call all check watchers 391 // call all check watchers
309 for (int i = cw.size (); i--; ) 392 for (int i = cw.size (); i--; )
310 if (!cw[i]) 393 if (!cw[i])
311 cw.erase_unordered (i); 394 cw.erase_unordered (i);
312 else 395 else
313 cw[i]->call (*cw[i]); 396 cw[i]->call (*cw[i]);
314#endif 397 #endif
315 398
316 struct TIMEVAL *to = 0; 399 struct TIMEVAL *to = 0;
317 struct TIMEVAL tval; 400 struct TIMEVAL tval;
318 401
319#if IOM_IDLE 402#if IOM_IDLE
… …
323 tval.TV_FRAC = 0; 406 tval.TV_FRAC = 0;
324 to = &tval; 407 to = &tval;
325 } 408 }
326 else 409 else
327#endif 410#endif
411#ifndef IOM_LIBEVENT
328 { 412 {
329#if IOM_TIME 413 #if IOM_TIME
330 // find earliest active watcher 414 // find earliest active watcher
331 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times 415 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
332 416
333 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); ) 417 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
334 if (*i && (*i)->at < next->at) 418 if (*i && (*i)->at < next->at)
335 next = *i; 419 next = *i;
336 420
337 if (next->at > NOW && next != tw[0]) 421 if (next->at > NOW && next != tw[0])
338 { 422 {
339 double diff = next->at - NOW; 423 double diff = next->at - NOW;
340 tval.tv_sec = (int)diff; 424 tval.tv_sec = (int)diff;
341 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT); 425 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
342 to = &tval; 426 to = &tval;
343 } 427 }
428 #endif
344 } 429 }
345#endif
346 430
347#if IOM_IO || IOM_SIG 431#if IOM_IO || IOM_SIG
348 fd_set rfd, wfd; 432 fd_set rfd, wfd;
349 433
350 FD_ZERO (&rfd); 434 FD_ZERO (&rfd);
351 FD_ZERO (&wfd); 435 FD_ZERO (&wfd);
352 436
353 int fds = 0; 437 int fds = 0;
354 438
355# if IOM_IO 439 #if IOM_IO
356 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); ) 440 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
357 if (*i) 441 if (*i)
358 { 442 {
359 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 443 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
360 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 444 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
361 445
362 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 446 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
363 } 447 }
364# endif 448 #endif
365 449
366 if (!to && !fds) //TODO: also check idle_watchers and check_watchers? 450 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
367 break; // no events 451 break; // no events
368 452
369# if IOM_SIG 453 #if IOM_SIG
370 FD_SET (sigpipe[0], &rfd); 454 FD_SET (sigpipe[0], &rfd);
371 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1; 455 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
372# endif 456 #endif
373 457
374# if IOM_SIG 458 #if IOM_SIG
375 // there is no race, as we use a pipe for signals, so select 459 // there is no race, as we use a pipe for signals, so select
376 // will return if a signal is caught. 460 // will return if a signal is caught.
377 sigprocmask (SIG_UNBLOCK, &sigs, NULL); 461 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
378# endif 462 #endif
379 fds = select (fds, &rfd, &wfd, NULL, to); 463 fds = select (fds, &rfd, &wfd, NULL, to);
380# if IOM_SIG 464 #if IOM_SIG
381 sigprocmask (SIG_BLOCK, &sigs, NULL); 465 sigprocmask (SIG_BLOCK, &sigs, NULL);
466 #endif
467
468#else
469 if (to)
470 event_loop (EVLOOP_NONBLOCK);
471 else
472 event_loop (EVLOOP_ONCE);
382# endif 473#endif
383 474
384# if IOM_TIME 475 #if IOM_TIME
385 { 476 {
386 // update time, try to compensate for gross non-monotonic time changes 477 // update time, try to compensate for gross non-monotonic time changes
387 tstamp diff = NOW; 478 tstamp diff = NOW;
388 set_now (); 479 set_now ();
389 diff = NOW - diff; 480 diff = NOW - diff;
390 481
391 if (diff < 0) 482 if (diff < 0)
392 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); ) 483 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
393 if (*i) 484 if (*i)
394 (*i)->at += diff; 485 (*i)->at += diff;
395 } 486 }
396# endif 487 #endif
397 488
489#ifndef IOM_LIBEVENT
398 if (fds > 0) 490 if (fds > 0)
399 { 491 {
400# if IOM_SIG 492 #if IOM_SIG
401 if (FD_ISSET (sigpipe[0], &rfd)) 493 if (FD_ISSET (sigpipe[0], &rfd))
402 {
403 char ch;
404
405 while (read (sigpipe[0], &ch, 1) > 0)
406 ;
407
408 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
409 if (*svp && (*svp)->pending)
410 {
411 sig_vec &sv = **svp;
412 for (int i = sv.size (); i--; )
413 if (!sv[i])
414 sv.erase_unordered (i);
415 else
416 sv[i]->call (*sv[i]);
417
418 sv.pending = false;
419 }
420 }
421# endif
422
423# if IOM_IO
424 for (int i = iow.size (); i--; )
425 if (!iow[i])
426 iow.erase_unordered (i);
427 else
428 { 494 {
429 io_watcher &w = *iow[i]; 495 char ch;
430 short revents = w.events;
431 496
432 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ; 497 while (read (sigpipe[0], &ch, 1) > 0)
433 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE; 498 ;
434 499
435 if (revents) 500 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
436 w.call (w, revents); 501 if (*svp && (*svp)->pending)
502 {
503 sig_vec &sv = **svp;
504 for (int i = sv.size (); i--; )
505 if (!sv[i])
506 sv.erase_unordered (i);
507 else
508 sv[i]->call (*sv[i]);
509
510 sv.pending = false;
511 }
437 } 512 }
438#endif 513 #endif
514
515 #if IOM_IO
516 for (int i = iow.size (); i--; )
517 if (!iow[i])
518 iow.erase_unordered (i);
519 else
520 {
521 io_watcher &w = *iow[i];
522 short revents = w.events;
523
524 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ;
525 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE;
526
527 if (revents)
528 w.call (w, revents);
529 }
530 #endif
439 } 531 }
440 else if (fds < 0 && errno != EINTR) 532 else if (fds < 0 && errno != EINTR)
441 { 533 {
442 perror ("io_manager: fatal error while waiting for I/O or time event, aborting."); 534 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
443 abort (); 535 abort ();
444 } 536 }
537#else
538 if (0)
539 ;
540#endif
445#if IOM_IDLE 541#if IOM_IDLE
446 else 542 else
447 for (int i = iw.size (); i--; ) 543 for (int i = iw.size (); i--; )
448 if (!iw[i]) 544 if (!iw[i])
449 iw.erase_unordered (i); 545 iw.erase_unordered (i);
… …
453 549
454#elif IOM_TIME 550#elif IOM_TIME
455 if (!to) 551 if (!to)
456 break; 552 break;
457 553
458 select (0, 0, 0, 0, &to); 554 select (0, 0, 0, 0, to);
459 set_now (); 555 set_now ();
460#else
461 break; 556 break;
462#endif 557#endif
463 } 558 }
464} 559}
465 560

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