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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.4 by pcg, Wed Nov 26 10:42:34 2003 UTC vs.
Revision 1.33 by root, Thu Jan 19 09:47:15 2006 UTC

1/* 1/*
2 iom.C -- generic I/O multiplexor 2 iom.C -- generic I/O multiplexer
3 Copyright (C) 2003 Marc Lehmann <pcg@goof.com> 3 Copyright (C) 2003, 2004 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. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18*/ 20*/
19 21
20#include "../config.h" 22#include "iom.h"
21 23
22#include <cstdio> 24#include <cstdio>
25#include <cstdlib>
26#include <cerrno>
27#include <cassert>
23 28
29#include <sys/types.h>
30#include <sys/time.h>
31
32#if 1 // older unices need these includes for select (2)
33# include <unistd.h>
34# include <time.h>
35#endif
36
37#if IOM_CHILD
38# include <sys/wait.h>
39#endif
40
41#if IOM_SIG
42# include <csignal>
43# include <fcntl.h>
44#endif
45
46// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
47// until that happens, sys/select.h must come last
24#include <sys/select.h> 48#include <sys/select.h>
25#include <sys/time.h>
26 49
27#include "iom.h" 50#define TIMEVAL timeval
51#define TV_FRAC tv_usec
52#define TV_MULT 1000000L
53
54#if IOM_IO
55static io_manager_vec<io_watcher> iow;
56#endif
57#if IOM_CHECK
58static io_manager_vec<check_watcher> cw;
59#endif
60#if IOM_TIME
61static io_manager_vec<time_watcher> tw;
62#endif
63#if IOM_IDLE
64static io_manager_vec<idle_watcher> iw;
65#endif
66#if IOM_SIG
67static int sigpipe[2]; // signal signalling pipe
68static sigset_t sigs;
69struct sig_vec : io_manager_vec<sig_watcher> {
70 int pending;
71 sig_vec ()
72 : pending (false)
73 { }
74};
75static vector<sig_vec *> sw;
76#endif
77#if IOM_CHILD
78static io_manager_vec<child_watcher> pw;
79#endif
80
81// this is a dummy time watcher to ensure that the first
82// time watcher is _always_ valid, this gets rid of a lot
83// of null-pointer-checks
84// (must come _before_ iom is being defined)
85static struct tw0 : time_watcher
86{
87 void cb (time_watcher &w)
88 {
89 // should never get called
90 // reached end-of-time, or tstamp has a bogus definition,
91 // or compiler initialisation order broken, or something else :)
92 abort ();
93 }
94
95 tw0 ()
96 : time_watcher (this, &tw0::cb)
97 { }
98} tw0;
28 99
29tstamp NOW; 100tstamp NOW;
101
102#if IOM_CHILD
103// sig_watcher for child signal(s)
104static struct sw0 : sig_watcher
105{
106 void cb (sig_watcher &w)
107 {
108 // SIGCHLD, call corresponding watchera
109 pid_t pid;
110 int status;
111
112 while ((pid = waitpid (-1, &status, WNOHANG)) > 0)
113 for (int i = pw.size (); i--; )
114 {
115 child_watcher *w = pw[i];
116
117 if (!w)
118 pw.erase_unordered (i);
119 else if (w->pid == pid)
120 {
121 w->stop ();
122 w->call (*w, status);
123 }
124 }
125
126 }
127
128 sw0 ()
129 : sig_watcher (this, &sw0::cb)
130 { }
131} sw0;
132#endif
133
134#if IOM_TIME
135tstamp io_manager::now ()
136{
137 struct timeval tv;
138
139 gettimeofday (&tv, 0);
140 return (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.;
141}
142
143void io_manager::set_now ()
144{
145 NOW = now ();
146}
147#endif
148
30bool iom_valid; 149static bool iom_valid;
31io_manager iom; 150
151// used for initialisation only
152static struct init {
153 init ()
154 {
155 iom_valid = true;
156
157#if IOM_SIG
158 sigemptyset (&sigs);
159
160 if (pipe (sigpipe))
161 {
162 perror ("io_manager: unable to create signal pipe, aborting.");
163 abort ();
164 }
165
166 fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC);
167 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC);
168#endif
169
170#if IOM_CHILD
171 sw0.start (SIGCHLD);
172#endif
173
174#if IOM_TIME
175 io_manager::set_now ();
176
177 tw0.start (TSTAMP_MAX);
178#endif
179 }
180
181 ~init ()
182 {
183 iom_valid = false;
184 }
185
186 static void required ();
187} init;
188
189void
190init::required ()
191{
192 if (!iom_valid)
193 {
194 write (2, "io_manager: early registration attempt, aborting.\n",
195 sizeof ("io_manager: early registration attempt, aborting.\n") - 1);
196 abort ();
197 }
198}
32 199
33template<class watcher> 200template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 201void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
35{ 202{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 203 init::required ();
204
205 if (!w.active)
206 {
37 queue.push_back (w); 207 queue.push_back (&w);
208 w.active = queue.size ();
209 }
38} 210}
39 211
40template<class watcher> 212template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 213void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
42{ 214{
43 queue.erase (find (queue.begin (), queue.end (), w)); 215 if (!iom_valid)
216 return;
217
218 if (w.active)
219 {
220 queue [w.active - 1] = 0;
221 w.active = 0;
222 }
44} 223}
224
225#if IOM_TIME
226void time_watcher::trigger ()
227{
228 call (*this);
229 io_manager::reg (*this);
230}
231
232void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
233void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
234#endif
45 235
46#if IOM_IO 236#if IOM_IO
47io_watcher::~io_watcher () 237void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
48{ 238void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
49 if (iom_valid)
50 iom.unreg (this);
51}
52
53void io_manager::reg (io_watcher *w)
54{
55 reg (w, iow);
56}
57
58void io_manager::unreg (io_watcher *w)
59{
60 unreg (w, iow);
61}
62
63#endif
64
65#if IOM_TIME
66void time_watcher::trigger ()
67{
68 call (*this);
69
70 iom.reg (this);
71}
72
73time_watcher::~time_watcher ()
74{
75 if (iom_valid)
76 iom.unreg (this);
77
78 at = TSTAMP_CANCEL;
79}
80
81void io_manager::reg (time_watcher *w)
82{
83 reg (w, tw);
84}
85
86void io_manager::unreg (time_watcher *w)
87{
88 unreg (w, tw);
89}
90#endif 239#endif
91 240
92#if IOM_CHECK 241#if IOM_CHECK
93check_watcher::~check_watcher () 242void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
94{ 243void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
95 if (iom_valid) 244#endif
96 iom.unreg (this);
97}
98 245
246#if IOM_IDLE
247void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
248void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
249#endif
250
251#if IOM_SIG
252static void
253sighandler (int signum)
254{
255 sw [signum - 1]->pending = true;
256
257 // we use a pipe for signal notifications, as most current
258 // OSes (Linux...) do not implement pselect correctly. ugh.
259 char ch = signum; // actual content not used
260 write (sigpipe[1], &ch, 1);
261}
262
99void io_manager::reg (check_watcher *w) 263void io_manager::reg (sig_watcher &w)
100{ 264{
101 reg (w, cw); 265 init::required ();
102}
103 266
267 assert (0 < w.signum);
268
269 sw.reserve (w.signum);
270
271 while (sw.size () < w.signum) // pathetic
272 sw.push_back (0);
273
274 sig_vec *&sv = sw[w.signum - 1];
275
276 if (!sv)
277 {
278 sv = new sig_vec;
279
280 sigaddset (&sigs, w.signum);
281 sigprocmask (SIG_BLOCK, &sigs, NULL);
282
283 struct sigaction sa;
284 sa.sa_handler = sighandler;
285 sigfillset (&sa.sa_mask);
286 sa.sa_flags = SA_RESTART;
287
288 if (sigaction (w.signum, &sa, 0))
289 {
290 perror ("io_manager: error while installing signal handler, ignoring.");
291 abort ();
292 }
293
294 }
295
296 io_manager::reg (w, *sv);
297}
298
104void io_manager::unreg (check_watcher *w) 299void io_manager::unreg (sig_watcher &w)
105{ 300{
106 unreg (w, cw); 301 if (!w.active || !iom_valid)
107} 302 return;
108#endif
109 303
110#if IOM_TIME 304 assert (0 < w.signum && w.signum <= sw.size ());
111inline void set_now (void) 305
112{ 306 io_manager::unreg (w, *sw[w.signum - 1]);
113 struct timeval tv;
114
115 gettimeofday (&tv, 0);
116
117 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
118#endif
119} 307}
308
309void sig_watcher::start (int signum)
310{
311 stop ();
312 this->signum = signum;
313 io_manager::reg (*this);
314}
315#endif
316
317#if IOM_CHILD
318void io_manager::reg (child_watcher &w) { io_manager::reg (w, pw); }
319void io_manager::unreg (child_watcher &w) { io_manager::unreg (w, pw); }
320#endif
120 321
121void io_manager::loop () 322void io_manager::loop ()
122{ 323{
324 init::required ();
325
123#if IOM_TIME 326#if IOM_TIME
124 set_now (); 327 set_now ();
125#endif 328#endif
126 329
127 for (;;) 330 for (;;)
128 { 331 {
332
333#if IOM_TIME
334 // call pending time watchers
335 {
336 bool activity;
337
338 do
339 {
340 activity = false;
341
342 for (int i = tw.size (); i--; )
343 if (!tw[i])
344 tw.erase_unordered (i);
345 else if (tw[i]->at <= NOW)
346 {
347 time_watcher &w = *tw[i];
348
349 unreg (w);
350 w.call (w);
351
352 activity = true;
353 }
354 }
355 while (activity);
356 }
357#endif
358
129#if IOM_CHECK 359#if IOM_CHECK
360 // call all check watchers
130 for (int i = 0; i < cw.size (); ++i) 361 for (int i = cw.size (); i--; )
362 if (!cw[i])
363 cw.erase_unordered (i);
364 else
131 cw[i]->call (*cw[i]); 365 cw[i]->call (*cw[i]);
132#endif 366#endif
133 367
368 struct TIMEVAL *to = 0;
369 struct TIMEVAL tval;
370
134#if IOM_TIME 371#if IOM_IDLE
135 time_watcher *w; 372 if (iw.size ())
136
137 for (;;)
138 { 373 {
139 w = tw[0]; 374 tval.tv_sec = 0;
140 375 tval.TV_FRAC = 0;
141 for (time_watcher **i = tw.begin (); i < tw.end (); ++i) 376 to = &tval;
142 if ((*i)->at < w->at)
143 w = *i;
144
145 if (w->at > NOW)
146 break;
147
148 // call it
149 w->call (*w);
150
151 if (w->at < 0)
152 unreg (w);
153 } 377 }
378 else
379#endif
380 {
381#if IOM_TIME
382 // find earliest active watcher
383 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
154 384
385 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
386 if (*i && (*i)->at < next->at)
387 next = *i;
388
389 if (next->at > NOW && next != tw[0])
390 {
155 double diff = w->at - NOW; 391 double diff = next->at - NOW;
156 struct timeval to;
157 to.tv_sec = (int)diff; 392 tval.tv_sec = (int)diff;
158 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 393 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
394 to = &tval;
395 }
396 }
159#endif 397#endif
160 398
161#if IOM_IO 399#if IOM_IO || IOM_SIG
162 fd_set rfd, wfd; 400 fd_set rfd, wfd;
163 401
164 FD_ZERO (&rfd); 402 FD_ZERO (&rfd);
165 FD_ZERO (&wfd); 403 FD_ZERO (&wfd);
166 404
167 int fds = 0; 405 int fds = 0;
168 406
169 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 407# if IOM_IO
408 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
409 if (*i)
410 {
411 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
412 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
413
414 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
415 }
416# endif
417
418 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
419 break; // no events
420
421# if IOM_SIG
422 FD_SET (sigpipe[0], &rfd);
423 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
424# endif
425
426# if IOM_SIG
427 // there is no race, as we use a pipe for signals, so select
428 // will return if a signal is caught.
429 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
430# endif
431 fds = select (fds, &rfd, &wfd, NULL, to);
432# if IOM_SIG
433 sigprocmask (SIG_BLOCK, &sigs, NULL);
434# endif
435
436# if IOM_TIME
437 {
438 // update time, try to compensate for gross non-monotonic time changes
439 tstamp diff = NOW;
440 set_now ();
441 diff = NOW - diff;
442
443 if (diff < 0)
444 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
445 if (*i)
446 (*i)->at += diff;
447 }
448# endif
449
450 if (fds > 0)
170 { 451 {
171 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 452# if IOM_SIG
172 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 453 if (FD_ISSET (sigpipe[0], &rfd))
454 {
455 char ch;
173 456
174 if ((*w)->fd > fds) fds = (*w)->fd; 457 while (read (sigpipe[0], &ch, 1) > 0)
458 ;
459
460 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
461 if (*svp && (*svp)->pending)
462 {
463 sig_vec &sv = **svp;
464 for (int i = sv.size (); i--; )
465 if (!sv[i])
466 sv.erase_unordered (i);
467 else
468 sv[i]->call (*sv[i]);
469
470 sv.pending = false;
471 }
472 }
473# endif
474
475# if IOM_IO
476 for (int i = iow.size (); i--; )
477 if (!iow[i])
478 iow.erase_unordered (i);
479 else
480 {
481 io_watcher &w = *iow[i];
482 short revents = w.events;
483
484 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ;
485 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE;
486
487 if (revents)
488 w.call (w, revents);
489 }
490#endif
175 } 491 }
176 492 else if (fds < 0 && errno != EINTR)
493 {
494 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
495 abort ();
496 }
177# if IOM_TIME 497#if IOM_IDLE
178 fds = select (fds + 1, &rfd, &wfd, 0, &to); 498 else
179 set_now (); 499 for (int i = iw.size (); i--; )
180# else 500 if (!iw[i])
181 fds = select (fds + 1, &rfd, &wfd, 0, 0); 501 iw.erase_unordered (i);
502 else
503 iw[i]->call (*iw[i]);
182# endif 504#endif
183 505
184 if (fds > 0)
185 for (int i = 0; i < iow.size (); ++i)
186 {
187 io_watcher *w = iow[i];
188
189 short revents = w->events;
190
191 if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ;
192 if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE;
193
194 if (revents)
195 w->call (*w, revents);
196 }
197 }
198#elif IOM_TIME 506#elif IOM_TIME
507 if (!to)
508 break;
509
199 select (0, 0, 0, 0, &to); 510 select (0, 0, 0, 0, &to);
200 set_now (); 511 set_now ();
512#else
513 break;
201#endif 514#endif
515 }
202} 516}
203 517
204void io_manager::idle_cb (time_watcher &w)
205{
206 w.at = NOW + 1000000000;
207}
208
209io_manager::io_manager ()
210{
211 set_now ();
212
213 iom_valid = true;
214
215#if IOM_TIME
216 idle = new time_watcher (this, &io_manager::idle_cb);
217 idle->start (0);
218#endif
219}
220
221io_manager::~io_manager ()
222{
223 iom_valid = false;
224}
225

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