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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.5 by pcg, Sat Nov 29 18:42:07 2003 UTC vs.
Revision 1.37 by root, Mon Feb 12 17:34:58 2007 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) 2003-2006 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. 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 io_manager::unreg (*w);
122 w->call (*w, status);
123 }
124 }
125 }
126
127 sw0 ()
128 : sig_watcher (this, &sw0::cb)
129 { }
130} sw0;
131#endif
132
133#if IOM_TIME
134tstamp io_manager::now ()
135{
136 struct timeval tv;
137
138 gettimeofday (&tv, 0);
139 return (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.;
140}
141
142void io_manager::set_now ()
143{
144 NOW = now ();
145}
146#endif
147
30bool iom_valid; 148static bool iom_valid;
31io_manager iom; 149
150// used for initialisation only
151static struct init {
152 init ()
153 {
154#ifdef IOM_PREINIT
155 { IOM_PREINIT }
156#endif
157 iom_valid = true;
158
159#if IOM_SIG
160 sigemptyset (&sigs);
161
162 if (pipe (sigpipe))
163 {
164 perror ("io_manager: unable to create signal pipe, aborting.");
165 abort ();
166 }
167
168 fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC);
169 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC);
170#endif
171
172#if IOM_CHILD
173 sw0.start (SIGCHLD);
174#endif
175
176#if IOM_TIME
177 io_manager::set_now ();
178
179 tw0.start (TSTAMP_MAX);
180#endif
181
182#ifdef IOM_POSTINIT
183 { IOM_POSTINIT }
184#endif
185 }
186
187 ~init ()
188 {
189 iom_valid = false;
190 }
191
192 static void required ();
193} init;
194
195void
196init::required ()
197{
198 if (!iom_valid)
199 {
200 write (2, "io_manager: early registration attempt, aborting.\n",
201 sizeof ("io_manager: early registration attempt, aborting.\n") - 1);
202 abort ();
203 }
204}
32 205
33template<class watcher> 206template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 207void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
35{ 208{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 209 init::required ();
210
211 if (!w.active)
212 {
37 queue.push_back (w); 213 queue.push_back (&w);
214 w.active = queue.size ();
215 }
38} 216}
39 217
40template<class watcher> 218template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 219void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
42{ 220{
43 queue.erase (find (queue.begin (), queue.end (), w)); 221 if (!iom_valid)
222 return;
223
224 if (w.active)
225 {
226 queue [w.active - 1] = 0;
227 w.active = 0;
228 }
44} 229}
230
231#if IOM_TIME
232void time_watcher::trigger ()
233{
234 call (*this);
235 io_manager::reg (*this);
236}
237
238void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
239void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
240#endif
45 241
46#if IOM_IO 242#if IOM_IO
47io_watcher::~io_watcher () 243void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
48{ 244void 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 245#endif
91 246
92#if IOM_CHECK 247#if IOM_CHECK
93check_watcher::~check_watcher () 248void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
94{ 249void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
95 if (iom_valid) 250#endif
96 iom.unreg (this);
97}
98 251
252#if IOM_IDLE
253void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
254void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
255#endif
256
257#if IOM_SIG
258static void
259sighandler (int signum)
260{
261 sw [signum - 1]->pending = true;
262
263 // we use a pipe for signal notifications, as most current
264 // OSes (Linux...) do not implement pselect correctly. ugh.
265 char ch = signum; // actual content not used
266 write (sigpipe[1], &ch, 1);
267}
268
99void io_manager::reg (check_watcher *w) 269void io_manager::reg (sig_watcher &w)
100{ 270{
101 reg (w, cw); 271 init::required ();
102}
103 272
273 assert (0 < w.signum);
274
275 sw.reserve (w.signum);
276
277 while (sw.size () < w.signum) // pathetic
278 sw.push_back (0);
279
280 sig_vec *&sv = sw[w.signum - 1];
281
282 if (!sv)
283 {
284 sv = new sig_vec;
285
286 sigaddset (&sigs, w.signum);
287 sigprocmask (SIG_BLOCK, &sigs, NULL);
288
289 struct sigaction sa;
290 sa.sa_handler = sighandler;
291 sigfillset (&sa.sa_mask);
292 sa.sa_flags = SA_RESTART;
293
294 if (sigaction (w.signum, &sa, 0))
295 {
296 perror ("io_manager: error while installing signal handler, ignoring.");
297 abort ();
298 }
299
300 }
301
302 io_manager::reg (w, *sv);
303}
304
104void io_manager::unreg (check_watcher *w) 305void io_manager::unreg (sig_watcher &w)
105{ 306{
106 unreg (w, cw); 307 if (!w.active || !iom_valid)
107} 308 return;
108#endif
109 309
110#if IOM_TIME 310 assert (0 < w.signum && w.signum <= sw.size ());
111inline void set_now (void) 311
112{ 312 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} 313}
314
315void sig_watcher::start (int signum)
316{
317 stop ();
318 this->signum = signum;
319 io_manager::reg (*this);
320}
321#endif
322
323#if IOM_CHILD
324void io_manager::reg (child_watcher &w) { io_manager::reg (w, pw); }
325void io_manager::unreg (child_watcher &w) { io_manager::unreg (w, pw); }
326#endif
120 327
121void io_manager::loop () 328void io_manager::loop ()
122{ 329{
330 init::required ();
331
123#if IOM_TIME 332#if IOM_TIME
124 set_now (); 333 set_now ();
125#endif 334#endif
126 335
127 for (;;) 336 for (;;)
128 { 337 {
338
339#if IOM_TIME
340 // call pending time watchers
341 {
342 bool activity;
343
344 do
345 {
346 activity = false;
347
348 for (int i = tw.size (); i--; )
349 if (!tw[i])
350 tw.erase_unordered (i);
351 else if (tw[i]->at <= NOW)
352 {
353 time_watcher &w = *tw[i];
354
355 unreg (w);
356 w.call (w);
357
358 activity = true;
359 }
360 }
361 while (activity);
362 }
363#endif
364
129#if IOM_CHECK 365#if IOM_CHECK
366 // call all check watchers
130 for (int i = 0; i < cw.size (); ++i) 367 for (int i = cw.size (); i--; )
368 if (!cw[i])
369 cw.erase_unordered (i);
370 else
131 cw[i]->call (*cw[i]); 371 cw[i]->call (*cw[i]);
132#endif 372#endif
133 373
134 struct timeval *to = 0; 374 struct TIMEVAL *to = 0;
375 struct TIMEVAL tval;
135 376
136#if IOM_TIME 377#if IOM_IDLE
137 struct timeval tval;
138 time_watcher *w;
139
140 for (;tw.size ();) 378 if (iw.size ())
141 { 379 {
142 w = tw[0]; 380 tval.tv_sec = 0;
381 tval.TV_FRAC = 0;
382 to = &tval;
383 }
384 else
385#endif
386 {
387#if IOM_TIME
388 // find earliest active watcher
389 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
143 390
144 for (time_watcher **i = tw.begin (); i < tw.end (); ++i) 391 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
145 if ((*i)->at < w->at) 392 if (*i && (*i)->at < next->at)
146 w = *i; 393 next = *i;
147 394
148 if (w->at > NOW) 395 if (next->at > NOW && next != tw[0])
149 { 396 {
150 double diff = w->at - NOW; 397 double diff = next->at - NOW;
151 tval.tv_sec = (int)diff; 398 tval.tv_sec = (int)diff;
152 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 399 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
153 to = &tval; 400 to = &tval;
154 break;
155 } 401 }
156 else if (w->at >= 0)
157 w->call (*w);
158 else
159 unreg (w);
160 } 402 }
161#endif 403#endif
162 404
163#if IOM_IO 405#if IOM_IO || IOM_SIG
164 fd_set rfd, wfd; 406 fd_set rfd, wfd;
165 407
166 FD_ZERO (&rfd); 408 FD_ZERO (&rfd);
167 FD_ZERO (&wfd); 409 FD_ZERO (&wfd);
168 410
169 int fds = 0; 411 int fds = 0;
170 412
171 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 413# if IOM_IO
414 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
415 if (*i)
416 {
417 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
418 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
419
420 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
421 }
422# endif
423
424 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
425 break; // no events
426
427# if IOM_SIG
428 FD_SET (sigpipe[0], &rfd);
429 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
430# endif
431
432# if IOM_SIG
433 // there is no race, as we use a pipe for signals, so select
434 // will return if a signal is caught.
435 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
436# endif
437 fds = select (fds, &rfd, &wfd, NULL, to);
438# if IOM_SIG
439 sigprocmask (SIG_BLOCK, &sigs, NULL);
440# endif
441
442# if IOM_TIME
443 {
444 // update time, try to compensate for gross non-monotonic time changes
445 tstamp diff = NOW;
446 set_now ();
447 diff = NOW - diff;
448
449 if (diff < 0)
450 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
451 if (*i)
452 (*i)->at += diff;
453 }
454# endif
455
456 if (fds > 0)
172 { 457 {
173 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 458# if IOM_SIG
174 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 459 if (FD_ISSET (sigpipe[0], &rfd))
460 {
461 char ch;
175 462
176 if ((*w)->fd >= fds) fds = (*w)->fd + 1; 463 while (read (sigpipe[0], &ch, 1) > 0)
464 ;
465
466 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
467 if (*svp && (*svp)->pending)
468 {
469 sig_vec &sv = **svp;
470 for (int i = sv.size (); i--; )
471 if (!sv[i])
472 sv.erase_unordered (i);
473 else
474 sv[i]->call (*sv[i]);
475
476 sv.pending = false;
477 }
478 }
479# endif
480
481# if IOM_IO
482 for (int i = iow.size (); i--; )
483 if (!iow[i])
484 iow.erase_unordered (i);
485 else
486 {
487 io_watcher &w = *iow[i];
488 short revents = w.events;
489
490 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ;
491 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE;
492
493 if (revents)
494 w.call (w, revents);
495 }
496#endif
177 } 497 }
178 498 else if (fds < 0 && errno != EINTR)
179 if (!to && !fds) 499 {
180 break; // no events 500 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
181 501 abort ();
182 fds = select (fds, &rfd, &wfd, 0, to); 502 }
183# if IOM_TIME 503#if IOM_IDLE
184 set_now (); 504 else
505 for (int i = iw.size (); i--; )
506 if (!iw[i])
507 iw.erase_unordered (i);
508 else
509 iw[i]->call (*iw[i]);
185# endif 510#endif
186 511
187 if (fds > 0)
188 for (int i = 0; i < iow.size (); ++i)
189 {
190 io_watcher *w = iow[i];
191
192 short revents = w->events;
193
194 if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ;
195 if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE;
196
197 if (revents)
198 w->call (*w, revents);
199 }
200#elif IOM_TIME 512#elif IOM_TIME
201 if (!to) 513 if (!to)
202 break; 514 break;
203 515
204 select (0, 0, 0, 0, &to); 516 select (0, 0, 0, 0, &to);
… …
207 break; 519 break;
208#endif 520#endif
209 } 521 }
210} 522}
211 523
212io_manager::io_manager ()
213{
214#if IOM_TIME
215 set_now ();
216#endif
217
218 iom_valid = true;
219}
220
221io_manager::~io_manager ()
222{
223 iom_valid = false;
224}
225

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