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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 1.36 by root, Thu Dec 14 03:18:34 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) 2003-2006 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 iom_valid = true;
155
156#if IOM_SIG
157 sigemptyset (&sigs);
158
159 if (pipe (sigpipe))
160 {
161 perror ("io_manager: unable to create signal pipe, aborting.");
162 abort ();
163 }
164
165 fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC);
166 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC);
167#endif
168
169#if IOM_CHILD
170 sw0.start (SIGCHLD);
171#endif
172
173#if IOM_TIME
174 io_manager::set_now ();
175
176 tw0.start (TSTAMP_MAX);
177#endif
178 }
179
180 ~init ()
181 {
182 iom_valid = false;
183 }
184
185 static void required ();
186} init;
187
188void
189init::required ()
190{
191 if (!iom_valid)
192 {
193 write (2, "io_manager: early registration attempt, aborting.\n",
194 sizeof ("io_manager: early registration attempt, aborting.\n") - 1);
195 abort ();
196 }
197}
32 198
33template<class watcher> 199template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 200void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
35{ 201{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 202 init::required ();
203
204 if (!w.active)
205 {
37 queue.push_back (w); 206 queue.push_back (&w);
207 w.active = queue.size ();
208 }
38} 209}
39 210
40template<class watcher> 211template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 212void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
42{ 213{
43 queue.erase (find (queue.begin (), queue.end (), w)); 214 if (!iom_valid)
215 return;
216
217 if (w.active)
218 {
219 queue [w.active - 1] = 0;
220 w.active = 0;
221 }
44} 222}
223
224#if IOM_TIME
225void time_watcher::trigger ()
226{
227 call (*this);
228 io_manager::reg (*this);
229}
230
231void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
232void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
233#endif
45 234
46#if IOM_IO 235#if IOM_IO
47io_watcher::~io_watcher () 236void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
48{ 237void 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 238#endif
91 239
92#if IOM_CHECK 240#if IOM_CHECK
93check_watcher::~check_watcher () 241void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
94{ 242void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
95 if (iom_valid) 243#endif
96 iom.unreg (this);
97}
98 244
245#if IOM_IDLE
246void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
247void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
248#endif
249
250#if IOM_SIG
251static void
252sighandler (int signum)
253{
254 sw [signum - 1]->pending = true;
255
256 // we use a pipe for signal notifications, as most current
257 // OSes (Linux...) do not implement pselect correctly. ugh.
258 char ch = signum; // actual content not used
259 write (sigpipe[1], &ch, 1);
260}
261
99void io_manager::reg (check_watcher *w) 262void io_manager::reg (sig_watcher &w)
100{ 263{
101 reg (w, cw); 264 init::required ();
102}
103 265
266 assert (0 < w.signum);
267
268 sw.reserve (w.signum);
269
270 while (sw.size () < w.signum) // pathetic
271 sw.push_back (0);
272
273 sig_vec *&sv = sw[w.signum - 1];
274
275 if (!sv)
276 {
277 sv = new sig_vec;
278
279 sigaddset (&sigs, w.signum);
280 sigprocmask (SIG_BLOCK, &sigs, NULL);
281
282 struct sigaction sa;
283 sa.sa_handler = sighandler;
284 sigfillset (&sa.sa_mask);
285 sa.sa_flags = SA_RESTART;
286
287 if (sigaction (w.signum, &sa, 0))
288 {
289 perror ("io_manager: error while installing signal handler, ignoring.");
290 abort ();
291 }
292
293 }
294
295 io_manager::reg (w, *sv);
296}
297
104void io_manager::unreg (check_watcher *w) 298void io_manager::unreg (sig_watcher &w)
105{ 299{
106 unreg (w, cw); 300 if (!w.active || !iom_valid)
107} 301 return;
108#endif
109 302
110#if IOM_TIME 303 assert (0 < w.signum && w.signum <= sw.size ());
111inline void set_now (void) 304
112{ 305 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} 306}
307
308void sig_watcher::start (int signum)
309{
310 stop ();
311 this->signum = signum;
312 io_manager::reg (*this);
313}
314#endif
315
316#if IOM_CHILD
317void io_manager::reg (child_watcher &w) { io_manager::reg (w, pw); }
318void io_manager::unreg (child_watcher &w) { io_manager::unreg (w, pw); }
319#endif
120 320
121void io_manager::loop () 321void io_manager::loop ()
122{ 322{
323 init::required ();
324
123#if IOM_TIME 325#if IOM_TIME
124 set_now (); 326 set_now ();
125#endif 327#endif
126 328
127 for (;;) 329 for (;;)
128 { 330 {
331
332#if IOM_TIME
333 // call pending time watchers
334 {
335 bool activity;
336
337 do
338 {
339 activity = false;
340
341 for (int i = tw.size (); i--; )
342 if (!tw[i])
343 tw.erase_unordered (i);
344 else if (tw[i]->at <= NOW)
345 {
346 time_watcher &w = *tw[i];
347
348 unreg (w);
349 w.call (w);
350
351 activity = true;
352 }
353 }
354 while (activity);
355 }
356#endif
357
129#if IOM_CHECK 358#if IOM_CHECK
359 // call all check watchers
130 for (int i = 0; i < cw.size (); ++i) 360 for (int i = cw.size (); i--; )
361 if (!cw[i])
362 cw.erase_unordered (i);
363 else
131 cw[i]->call (*cw[i]); 364 cw[i]->call (*cw[i]);
132#endif 365#endif
133 366
134 struct timeval *to = 0; 367 struct TIMEVAL *to = 0;
368 struct TIMEVAL tval;
135 369
136#if IOM_TIME 370#if IOM_IDLE
137 struct timeval tval;
138 time_watcher *w;
139
140 for (;tw.size ();) 371 if (iw.size ())
141 { 372 {
142 w = tw[0]; 373 tval.tv_sec = 0;
374 tval.TV_FRAC = 0;
375 to = &tval;
376 }
377 else
378#endif
379 {
380#if IOM_TIME
381 // find earliest active watcher
382 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
143 383
144 for (time_watcher **i = tw.begin (); i < tw.end (); ++i) 384 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
145 if ((*i)->at < w->at) 385 if (*i && (*i)->at < next->at)
146 w = *i; 386 next = *i;
147 387
148 if (w->at > NOW) 388 if (next->at > NOW && next != tw[0])
149 { 389 {
150 double diff = w->at - NOW; 390 double diff = next->at - NOW;
151 tval.tv_sec = (int)diff; 391 tval.tv_sec = (int)diff;
152 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 392 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
153 to = &tval; 393 to = &tval;
154 break;
155 } 394 }
156 else if (w->at >= 0)
157 w->call (*w);
158 else
159 unreg (w);
160 } 395 }
161#endif 396#endif
162 397
163#if IOM_IO 398#if IOM_IO || IOM_SIG
164 fd_set rfd, wfd; 399 fd_set rfd, wfd;
165 400
166 FD_ZERO (&rfd); 401 FD_ZERO (&rfd);
167 FD_ZERO (&wfd); 402 FD_ZERO (&wfd);
168 403
169 int fds = 0; 404 int fds = 0;
170 405
171 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 406# if IOM_IO
407 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
408 if (*i)
409 {
410 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
411 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
412
413 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
414 }
415# endif
416
417 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
418 break; // no events
419
420# if IOM_SIG
421 FD_SET (sigpipe[0], &rfd);
422 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
423# endif
424
425# if IOM_SIG
426 // there is no race, as we use a pipe for signals, so select
427 // will return if a signal is caught.
428 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
429# endif
430 fds = select (fds, &rfd, &wfd, NULL, to);
431# if IOM_SIG
432 sigprocmask (SIG_BLOCK, &sigs, NULL);
433# endif
434
435# if IOM_TIME
436 {
437 // update time, try to compensate for gross non-monotonic time changes
438 tstamp diff = NOW;
439 set_now ();
440 diff = NOW - diff;
441
442 if (diff < 0)
443 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
444 if (*i)
445 (*i)->at += diff;
446 }
447# endif
448
449 if (fds > 0)
172 { 450 {
173 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 451# if IOM_SIG
174 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 452 if (FD_ISSET (sigpipe[0], &rfd))
453 {
454 char ch;
175 455
176 if ((*w)->fd >= fds) fds = (*w)->fd + 1; 456 while (read (sigpipe[0], &ch, 1) > 0)
457 ;
458
459 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
460 if (*svp && (*svp)->pending)
461 {
462 sig_vec &sv = **svp;
463 for (int i = sv.size (); i--; )
464 if (!sv[i])
465 sv.erase_unordered (i);
466 else
467 sv[i]->call (*sv[i]);
468
469 sv.pending = false;
470 }
471 }
472# endif
473
474# if IOM_IO
475 for (int i = iow.size (); i--; )
476 if (!iow[i])
477 iow.erase_unordered (i);
478 else
479 {
480 io_watcher &w = *iow[i];
481 short revents = w.events;
482
483 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ;
484 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE;
485
486 if (revents)
487 w.call (w, revents);
488 }
489#endif
177 } 490 }
178 491 else if (fds < 0 && errno != EINTR)
179 if (!to && !fds) 492 {
180 break; // no events 493 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
181 494 abort ();
182 fds = select (fds, &rfd, &wfd, 0, to); 495 }
183# if IOM_TIME 496#if IOM_IDLE
184 set_now (); 497 else
498 for (int i = iw.size (); i--; )
499 if (!iw[i])
500 iw.erase_unordered (i);
501 else
502 iw[i]->call (*iw[i]);
185# endif 503#endif
186 504
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 505#elif IOM_TIME
201 if (!to) 506 if (!to)
202 break; 507 break;
203 508
204 select (0, 0, 0, 0, &to); 509 select (0, 0, 0, 0, &to);
… …
207 break; 512 break;
208#endif 513#endif
209 } 514 }
210} 515}
211 516
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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