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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.10 by pcg, Sat Jan 17 14:10:40 2004 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, 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. 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*/
21
22#include "iom.h"
19 23
20#include <cstdio> 24#include <cstdio>
21#include <cstdlib> 25#include <cstdlib>
22#include <cerrno> 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
28 53
29// TSTAMP_MAX must still fit into a positive struct timeval 54#if IOM_IO
30#define TSTAMP_MAX (double)(1UL<<31) 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
31 80
32// this is a dummy time watcher to ensure that the first 81// this is a dummy time watcher to ensure that the first
33// time watcher is _always_ valid, this gets rid of a lot 82// time watcher is _always_ valid, this gets rid of a lot
34// of null-pointer-checks 83// of null-pointer-checks
35// (must come _before_ iom is being defined) 84// (must come _before_ iom is being defined)
36static struct tw0 : time_watcher { 85static struct tw0 : time_watcher
86{
37 void cb (time_watcher &w) 87 void cb (time_watcher &w)
38 { 88 {
39 // should never get called 89 // should never get called
40 // reached end-of-time, or tstamp has a bogus definition, 90 // reached end-of-time, or tstamp has a bogus definition,
41 // or compiler initilization order broken, or somethine else :) 91 // or compiler initialisation order broken, or something else :)
42 abort (); 92 abort ();
43 } 93 }
44 94
45 tw0() 95 tw0 ()
46 : time_watcher (this, &tw0::cb) 96 : time_watcher (this, &tw0::cb)
47 { } 97 { }
48} tw0; 98} tw0;
49 99
50tstamp 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
51static bool iom_valid; 148static bool iom_valid;
52io_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}
53 205
54template<class watcher> 206template<class watcher>
55void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 207void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
56{ 208{
57 if (!iom_valid) 209 init::required ();
58 abort ();
59 210
60 if (!w->active) 211 if (!w.active)
61 { 212 {
62 queue.push_back (w); 213 queue.push_back (&w);
63 w->active = queue.size (); 214 w.active = queue.size ();
64 } 215 }
65} 216}
66 217
67template<class watcher> 218template<class watcher>
68void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 219void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
69{ 220{
70 if (!iom_valid) 221 if (!iom_valid)
71 return; 222 return;
72 223
73 if (w->active) 224 if (w.active)
74 { 225 {
75 queue [w->active - 1] = 0; 226 queue [w.active - 1] = 0;
76 w->active = 0; 227 w.active = 0;
77 } 228 }
78} 229}
79 230
80#if IOM_TIME 231#if IOM_TIME
81void time_watcher::trigger () 232void time_watcher::trigger ()
82{ 233{
83 call (*this); 234 call (*this);
84 235 io_manager::reg (*this);
85 iom.reg (this);
86} 236}
87 237
88void io_manager::reg (time_watcher *w) { reg (w, tw); } 238void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
89void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 239void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
90#endif 240#endif
91 241
92#if IOM_IO 242#if IOM_IO
93void io_manager::reg (io_watcher *w) { reg (w, iow); } 243void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
94void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 244void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
95#endif 245#endif
96 246
97#if IOM_CHECK 247#if IOM_CHECK
98void io_manager::reg (check_watcher *w) { reg (w, cw); } 248void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
99void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 249void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
100#endif 250#endif
101 251
102#if IOM_IDLE 252#if IOM_IDLE
103void io_manager::reg (idle_watcher *w) { reg (w, iw); } 253void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
104void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 254void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
105#endif 255#endif
106 256
107#if IOM_TIME 257#if IOM_SIG
108inline void set_now (void) 258static void
259sighandler (int signum)
109{ 260{
110 struct timeval tv; 261 sw [signum - 1]->pending = true;
111 262
112 gettimeofday (&tv, 0); 263 // we use a pipe for signal notifications, as most current
113 264 // OSes (Linux...) do not implement pselect correctly. ugh.
114 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 265 char ch = signum; // actual content not used
115#endif 266 write (sigpipe[1], &ch, 1);
116} 267}
268
269void io_manager::reg (sig_watcher &w)
270{
271 init::required ();
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
305void io_manager::unreg (sig_watcher &w)
306{
307 if (!w.active || !iom_valid)
308 return;
309
310 assert (0 < w.signum && w.signum <= sw.size ());
311
312 io_manager::unreg (w, *sw[w.signum - 1]);
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
117 327
118void io_manager::loop () 328void io_manager::loop ()
119{ 329{
330 init::required ();
331
120#if IOM_TIME 332#if IOM_TIME
121 set_now (); 333 set_now ();
122#endif 334#endif
123 335
124 for (;;) 336 for (;;)
125 { 337 {
126 struct timeval *to = 0;
127 struct timeval tval;
128 338
129#if IOM_IDLE 339#if IOM_TIME
130 if (iw.size ()) 340 // call pending time watchers
131 { 341 {
132 tval.tv_sec = 0; 342 bool activity;
133 tval.tv_usec = 0; 343
134 to = &tval;
135 } 344 do
136 else
137#endif
138 {
139#if IOM_TIME
140 time_watcher *next;
141
142 for (;;)
143 { 345 {
144 next = tw[0]; // the first time-watcher must exist at ALL times 346 activity = false;
145 347
146 for (int i = tw.size (); i--; ) 348 for (int i = tw.size (); i--; )
147 if (!tw[i]) 349 if (!tw[i])
148 tw.erase_unordered (i); 350 tw.erase_unordered (i);
149 else if (tw[i]->at < next->at) 351 else if (tw[i]->at <= NOW)
150 next = tw[i];
151
152 if (next->at > NOW)
153 { 352 {
154 if (next != tw[0]) 353 time_watcher &w = *tw[i];
155 { 354
156 double diff = next->at - NOW;
157 tval.tv_sec = (int)diff;
158 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000);
159 to = &tval;
160 }
161 break; 355 unreg (w);
356 w.call (w);
357
358 activity = true;
162 } 359 }
163 else
164 {
165 unreg (next);
166 next->call (*next);
167 }
168 } 360 }
169#endif 361 while (activity);
170 } 362 }
363#endif
171 364
172#if IOM_CHECK 365#if IOM_CHECK
366 // call all check watchers
173 for (int i = cw.size (); i--; ) 367 for (int i = cw.size (); i--; )
174 if (!cw[i]) 368 if (!cw[i])
175 cw.erase_unordered (i); 369 cw.erase_unordered (i);
176 else 370 else
177 cw[i]->call (*cw[i]); 371 cw[i]->call (*cw[i]);
178#endif 372#endif
179 373
374 struct TIMEVAL *to = 0;
375 struct TIMEVAL tval;
376
180#if IOM_IO 377#if IOM_IDLE
378 if (iw.size ())
379 {
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
390
391 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
392 if (*i && (*i)->at < next->at)
393 next = *i;
394
395 if (next->at > NOW && next != tw[0])
396 {
397 double diff = next->at - NOW;
398 tval.tv_sec = (int)diff;
399 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
400 to = &tval;
401 }
402 }
403#endif
404
405#if IOM_IO || IOM_SIG
181 fd_set rfd, wfd, efd; 406 fd_set rfd, wfd;
182 407
183 FD_ZERO (&rfd); 408 FD_ZERO (&rfd);
184 FD_ZERO (&wfd); 409 FD_ZERO (&wfd);
185 410
186 int fds = 0; 411 int fds = 0;
187 412
413# if IOM_IO
188 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); ) 414 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
189 if (*i) 415 if (*i)
190 { 416 {
191 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 417 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
192 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 418 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
193 419
194 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 420 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
195 } 421 }
422# endif
196 423
197 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 424 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
198 break; // no events 425 break; // no events
199 426
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
200 fds = select (fds, &rfd, &wfd, &efd, to); 437 fds = select (fds, &rfd, &wfd, NULL, to);
438# if IOM_SIG
439 sigprocmask (SIG_BLOCK, &sigs, NULL);
440# endif
441
201# if IOM_TIME 442# if IOM_TIME
443 {
444 // update time, try to compensate for gross non-monotonic time changes
445 tstamp diff = NOW;
202 set_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 }
203# endif 454# endif
204 455
205 if (fds > 0) 456 if (fds > 0)
206 for (int i = iow.size (); i--; ) 457 {
207 if (!iow[i]) 458# if IOM_SIG
208 iow.erase_unordered (i); 459 if (FD_ISSET (sigpipe[0], &rfd))
209 else
210 { 460 {
211 short revents = iow[i]->events; 461 char ch;
212 462
213 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 463 while (read (sigpipe[0], &ch, 1) > 0)
214 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 464 ;
215 465
216 if (revents) 466 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
217 iow[i]->call (*iow[i], revents); 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 }
218 } 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
497 }
219 else if (fds < 0 && errno != EINTR) 498 else if (fds < 0 && errno != EINTR)
220 { 499 {
221 perror ("Error while waiting for I/O or time event"); 500 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
222 abort (); 501 abort ();
223 } 502 }
224#if IOM_IDLE 503#if IOM_IDLE
225 else 504 else
226 for (int i = iw.size (); i--; ) 505 for (int i = iw.size (); i--; )
… …
240 break; 519 break;
241#endif 520#endif
242 } 521 }
243} 522}
244 523
245io_manager::io_manager ()
246{
247 iom_valid = true;
248
249#if IOM_TIME
250 set_now ();
251
252 tw0.start (TSTAMP_MAX);
253 printf ("abort, %f but inly on %f\n", NOW, tw0.at);
254#endif
255}
256
257io_manager::~io_manager ()
258{
259 iom_valid = false;
260}
261

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