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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.6 by pcg, Tue Dec 2 21:49:46 2003 UTC vs.
Revision 1.30 by root, Tue Nov 29 19:22:48 2005 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>
23 27
28#include <sys/time.h>
29
30#include <assert.h>
31
32#if 1 // older unices need these includes for select (2)
33# include <unistd.h>
34# include <sys/types.h>
35# include <time.h>
36#endif
37
38// for IOM_SIG
39#if IOM_SIG
40# include <csignal>
41# include <fcntl.h>
42#endif
43
44// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
45// until that happens, sys/select.h must come last
24#include <sys/select.h> 46#include <sys/select.h>
25#include <sys/time.h>
26 47
27#include "iom.h" 48#define TIMEVAL timeval
49#define TV_FRAC tv_usec
50#define TV_MULT 1000000L
51
52#if IOM_IO
53static io_manager_vec<io_watcher> iow;
54#endif
55#if IOM_CHECK
56static io_manager_vec<check_watcher> cw;
57#endif
58#if IOM_TIME
59static io_manager_vec<time_watcher> tw;
60#endif
61#if IOM_IDLE
62static io_manager_vec<idle_watcher> iw;
63#endif
64#if IOM_SIG
65static int sigpipe[2]; // signal signalling pipe
66static sigset_t sigs;
67struct sig_vec : io_manager_vec<sig_watcher> {
68 int pending;
69 sig_vec ()
70 : pending (false)
71 { }
72};
73static vector<sig_vec *> sw;
74#endif
75
76// this is a dummy time watcher to ensure that the first
77// time watcher is _always_ valid, this gets rid of a lot
78// of null-pointer-checks
79// (must come _before_ iom is being defined)
80static struct tw0 : time_watcher
81 {
82 void cb (time_watcher &w)
83 {
84 // should never get called
85 // reached end-of-time, or tstamp has a bogus definition,
86 // or compiler initialisation order broken, or something else :)
87 abort ();
88 }
89
90 tw0 ()
91 : time_watcher (this, &tw0::cb)
92 { }
93 } tw0;
28 94
29tstamp NOW; 95tstamp NOW;
96
97#if IOM_TIME
98tstamp io_manager::now ()
99{
100 struct timeval tv;
101
102 gettimeofday (&tv, 0);
103 return (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.;
104}
105
106void io_manager::set_now ()
107{
108 NOW = now ();
109}
110#endif
111
30bool iom_valid; 112static bool iom_valid;
31io_manager iom; 113
114// used for initialisation only
115static struct init {
116 init ()
117 {
118#if IOM_SIG
119 sigemptyset (&sigs);
120
121 if (pipe (sigpipe))
122 {
123 perror ("io_manager: unable to create signal pipe, aborting.");
124 abort ();
125 }
126
127 fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC);
128 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC);
129#endif
130
131 iom_valid = true;
132
133#if IOM_TIME
134 io_manager::set_now ();
135
136 tw0.start (TSTAMP_MAX);
137#endif
138 }
139
140 static void required ();
141} init;
142
143void
144init::required ()
145{
146 if (!iom_valid)
147 {
148 write (2, "io_manager: early registration attempt, aborting.\n",
149 sizeof ("io_manager: early registration attempt, aborting.\n") - 1);
150 abort ();
151 }
152}
32 153
33template<class watcher> 154template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 155void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
35{ 156{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 157 init::required ();
158
159 if (!w.active)
160 {
37 queue.push_back (w); 161 queue.push_back (&w);
162 w.active = queue.size ();
163 }
38} 164}
39 165
40template<class watcher> 166template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 167void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
42{ 168{
43 queue.erase (find (queue.begin (), queue.end (), w)); 169 if (!iom_valid)
170 return;
171
172 if (w.active)
173 {
174 queue [w.active - 1] = 0;
175 w.active = 0;
176 }
44} 177}
178
179#if IOM_TIME
180void time_watcher::trigger ()
181{
182 call (*this);
183 io_manager::reg (*this);
184}
185
186void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
187void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
188#endif
45 189
46#if IOM_IO 190#if IOM_IO
47io_watcher::~io_watcher () 191void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
48{ 192void 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 193#endif
91 194
92#if IOM_CHECK 195#if IOM_CHECK
93check_watcher::~check_watcher () 196void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
94{ 197void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
95 if (iom_valid) 198#endif
96 iom.unreg (this);
97}
98 199
200#if IOM_IDLE
201void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
202void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
203#endif
204
205#if IOM_SIG
206static void
207sighandler (int signum)
208{
209 sw [signum - 1]->pending = true;
210
211 // we use a pipe for signal notifications, as most current
212 // OSes (Linux...) do not implement pselect correctly. ugh.
213 char ch = signum; // actual content not used
214 write (sigpipe[1], &ch, 1);
215}
216
99void io_manager::reg (check_watcher *w) 217void io_manager::reg (sig_watcher &w)
100{ 218{
101 reg (w, cw); 219 assert (0 < w.signum);
102}
103 220
221 sw.reserve (w.signum);
222
223 while (sw.size () < w.signum) // pathetic
224 sw.push_back (0);
225
226 sig_vec *&sv = sw[w.signum - 1];
227
228 if (!sv)
229 {
230 sv = new sig_vec;
231
232 sigaddset (&sigs, w.signum);
233 sigprocmask (SIG_BLOCK, &sigs, NULL);
234
235 struct sigaction sa;
236 sa.sa_handler = sighandler;
237 sigfillset (&sa.sa_mask);
238 sa.sa_flags = SA_RESTART;
239
240 if (sigaction (w.signum, &sa, 0))
241 {
242 perror ("io_manager: error while installing signal handler, ignoring.");
243 abort ();
244 }
245
246 }
247
248 io_manager::reg (w, *sv);
249}
250
104void io_manager::unreg (check_watcher *w) 251void io_manager::unreg (sig_watcher &w)
105{ 252{
106 unreg (w, cw); 253 if (!w.active)
107} 254 return;
108#endif
109 255
110#if IOM_TIME 256 assert (0 < w.signum && w.signum <= sw.size ());
111inline void set_now (void) 257
112{ 258 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} 259}
260
261void sig_watcher::start (int signum)
262{
263 stop ();
264 this->signum = signum;
265 io_manager::reg (*this);
266}
267#endif
120 268
121void io_manager::loop () 269void io_manager::loop ()
122{ 270{
271 init::required ();
272
123#if IOM_TIME 273#if IOM_TIME
124 set_now (); 274 set_now ();
125#endif 275#endif
126 276
127 for (;;) 277 for (;;)
128 { 278 {
279
280#if IOM_TIME
281 // call pending time watchers
282 {
283 bool activity;
284
285 do
286 {
287 activity = false;
288
289 for (int i = tw.size (); i--; )
290 if (!tw[i])
291 tw.erase_unordered (i);
292 else if (tw[i]->at <= NOW)
293 {
294 time_watcher &w = *tw[i];
295
296 unreg (w);
297 w.call (w);
298
299 activity = true;
300 }
301 }
302 while (activity);
303 }
304#endif
305
306#if IOM_CHECK
307 // call all check watchers
308 for (int i = cw.size (); i--; )
309 if (!cw[i])
310 cw.erase_unordered (i);
311 else
312 cw[i]->call (*cw[i]);
313#endif
314
129 struct timeval *to = 0; 315 struct TIMEVAL *to = 0;
316 struct TIMEVAL tval;
130 317
131#if IOM_TIME 318#if IOM_IDLE
132 struct timeval tval;
133 time_watcher *w;
134
135 for (;tw.size ();) 319 if (iw.size ())
136 { 320 {
137 w = tw[0]; 321 tval.tv_sec = 0;
322 tval.TV_FRAC = 0;
323 to = &tval;
324 }
325 else
326#endif
327 {
328#if IOM_TIME
329 // find earliest active watcher
330 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
138 331
139 for (time_watcher **i = tw.begin (); i < tw.end (); ++i) 332 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
140 if ((*i)->at < w->at) 333 if (*i && (*i)->at < next->at)
141 w = *i; 334 next = *i;
142 335
143 if (w->at > NOW) 336 if (next->at > NOW && next != tw[0])
144 { 337 {
145 double diff = w->at - NOW; 338 double diff = next->at - NOW;
146 tval.tv_sec = (int)diff; 339 tval.tv_sec = (int)diff;
147 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 340 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
148 to = &tval; 341 to = &tval;
149 break;
150 } 342 }
151 else if (w->at >= 0)
152 w->call (*w);
153 else
154 unreg (w);
155 } 343 }
156#endif 344#endif
157 345
158#if IOM_CHECK 346#if IOM_IO || IOM_SIG
159 for (int i = 0; i < cw.size (); ++i)
160 cw[i]->call (*cw[i]);
161#endif
162
163#if IOM_IO
164 fd_set rfd, wfd; 347 fd_set rfd, wfd;
165 348
166 FD_ZERO (&rfd); 349 FD_ZERO (&rfd);
167 FD_ZERO (&wfd); 350 FD_ZERO (&wfd);
168 351
169 int fds = 0; 352 int fds = 0;
170 353
171 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 354# if IOM_IO
355 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
356 if (*i)
357 {
358 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
359 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
360
361 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
362 }
363# endif
364
365 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
366 break; // no events
367
368# if IOM_SIG
369 FD_SET (sigpipe[0], &rfd);
370 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
371# endif
372
373# if IOM_SIG
374 // there is no race, as we use a pipe for signals, so select
375 // will return if a signal is caught.
376 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
377# endif
378 fds = select (fds, &rfd, &wfd, NULL, to);
379# if IOM_SIG
380 sigprocmask (SIG_BLOCK, &sigs, NULL);
381# endif
382
383# if IOM_TIME
384 {
385 // update time, try to compensate for gross non-monotonic time changes
386 tstamp diff = NOW;
387 set_now ();
388 diff = NOW - diff;
389
390 if (diff < 0)
391 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
392 if (*i)
393 (*i)->at += diff;
394 }
395# endif
396
397 if (fds > 0)
172 { 398 {
173 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 399# if IOM_SIG
174 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 400 if (FD_ISSET (sigpipe[0], &rfd))
401 {
402 char ch;
175 403
176 if ((*w)->fd >= fds) fds = (*w)->fd + 1; 404 while (read (sigpipe[0], &ch, 1) > 0)
405 ;
406
407 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
408 if (*svp && (*svp)->pending)
409 {
410 sig_vec &sv = **svp;
411 for (int i = sv.size (); i--; )
412 if (!sv[i])
413 sv.erase_unordered (i);
414 else
415 sv[i]->call (*sv[i]);
416
417 sv.pending = false;
418 }
419 }
420# endif
421
422# if IOM_IO
423 for (int i = iow.size (); i--; )
424 if (!iow[i])
425 iow.erase_unordered (i);
426 else
427 {
428 io_watcher &w = *iow[i];
429 short revents = w.events;
430
431 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ;
432 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE;
433
434 if (revents)
435 w.call (w, revents);
436 }
437#endif
177 } 438 }
178 439 else if (fds < 0 && errno != EINTR)
179 if (!to && !fds) 440 {
180 break; // no events 441 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
181 442 abort ();
182 fds = select (fds, &rfd, &wfd, 0, to); 443 }
183# if IOM_TIME 444#if IOM_IDLE
184 set_now (); 445 else
446 for (int i = iw.size (); i--; )
447 if (!iw[i])
448 iw.erase_unordered (i);
449 else
450 iw[i]->call (*iw[i]);
185# endif 451#endif
186 452
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 453#elif IOM_TIME
201 if (!to) 454 if (!to)
202 break; 455 break;
203 456
204 select (0, 0, 0, 0, &to); 457 select (0, 0, 0, 0, &to);
… …
207 break; 460 break;
208#endif 461#endif
209 } 462 }
210} 463}
211 464
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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