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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 1.32 by root, Wed Jan 11 21:24:41 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>
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 ~init ()
141 {
142 iom_valid = false;
143 }
144
145 static void required ();
146} init;
147
148void
149init::required ()
150{
151 if (!iom_valid)
152 {
153 write (2, "io_manager: early registration attempt, aborting.\n",
154 sizeof ("io_manager: early registration attempt, aborting.\n") - 1);
155 abort ();
156 }
157}
32 158
33template<class watcher> 159template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 160void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
35{ 161{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 162 init::required ();
163
164 if (!w.active)
165 {
37 queue.push_back (w); 166 queue.push_back (&w);
167 w.active = queue.size ();
168 }
38} 169}
39 170
40template<class watcher> 171template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 172void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
42{ 173{
43 queue.erase (find (queue.begin (), queue.end (), w)); 174 if (!iom_valid)
175 return;
176
177 if (w.active)
178 {
179 queue [w.active - 1] = 0;
180 w.active = 0;
181 }
44} 182}
183
184#if IOM_TIME
185void time_watcher::trigger ()
186{
187 call (*this);
188 io_manager::reg (*this);
189}
190
191void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
192void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
193#endif
45 194
46#if IOM_IO 195#if IOM_IO
47io_watcher::~io_watcher () 196void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
48{ 197void 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 198#endif
91 199
92#if IOM_CHECK 200#if IOM_CHECK
93check_watcher::~check_watcher () 201void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
94{ 202void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
95 if (iom_valid) 203#endif
96 iom.unreg (this);
97}
98 204
205#if IOM_IDLE
206void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
207void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
208#endif
209
210#if IOM_SIG
211static void
212sighandler (int signum)
213{
214 sw [signum - 1]->pending = true;
215
216 // we use a pipe for signal notifications, as most current
217 // OSes (Linux...) do not implement pselect correctly. ugh.
218 char ch = signum; // actual content not used
219 write (sigpipe[1], &ch, 1);
220}
221
99void io_manager::reg (check_watcher *w) 222void io_manager::reg (sig_watcher &w)
100{ 223{
101 reg (w, cw); 224 init::required ();
102}
103 225
226 assert (0 < w.signum);
227
228 sw.reserve (w.signum);
229
230 while (sw.size () < w.signum) // pathetic
231 sw.push_back (0);
232
233 sig_vec *&sv = sw[w.signum - 1];
234
235 if (!sv)
236 {
237 sv = new sig_vec;
238
239 sigaddset (&sigs, w.signum);
240 sigprocmask (SIG_BLOCK, &sigs, NULL);
241
242 struct sigaction sa;
243 sa.sa_handler = sighandler;
244 sigfillset (&sa.sa_mask);
245 sa.sa_flags = SA_RESTART;
246
247 if (sigaction (w.signum, &sa, 0))
248 {
249 perror ("io_manager: error while installing signal handler, ignoring.");
250 abort ();
251 }
252
253 }
254
255 io_manager::reg (w, *sv);
256}
257
104void io_manager::unreg (check_watcher *w) 258void io_manager::unreg (sig_watcher &w)
105{ 259{
106 unreg (w, cw); 260 if (!w.active || !iom_valid)
107} 261 return;
108#endif
109 262
110#if IOM_TIME 263 assert (0 < w.signum && w.signum <= sw.size ());
111inline void set_now (void) 264
112{ 265 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} 266}
267
268void sig_watcher::start (int signum)
269{
270 stop ();
271 this->signum = signum;
272 io_manager::reg (*this);
273}
274#endif
120 275
121void io_manager::loop () 276void io_manager::loop ()
122{ 277{
278 init::required ();
279
123#if IOM_TIME 280#if IOM_TIME
124 set_now (); 281 set_now ();
125#endif 282#endif
126 283
127 for (;;) 284 for (;;)
128 { 285 {
286
287#if IOM_TIME
288 // call pending time watchers
289 {
290 bool activity;
291
292 do
293 {
294 activity = false;
295
296 for (int i = tw.size (); i--; )
297 if (!tw[i])
298 tw.erase_unordered (i);
299 else if (tw[i]->at <= NOW)
300 {
301 time_watcher &w = *tw[i];
302
303 unreg (w);
304 w.call (w);
305
306 activity = true;
307 }
308 }
309 while (activity);
310 }
311#endif
312
129#if IOM_CHECK 313#if IOM_CHECK
314 // call all check watchers
130 for (int i = 0; i < cw.size (); ++i) 315 for (int i = cw.size (); i--; )
316 if (!cw[i])
317 cw.erase_unordered (i);
318 else
131 cw[i]->call (*cw[i]); 319 cw[i]->call (*cw[i]);
132#endif 320#endif
133 321
322 struct TIMEVAL *to = 0;
323 struct TIMEVAL tval;
324
134#if IOM_TIME 325#if IOM_IDLE
135 time_watcher *w; 326 if (iw.size ())
136
137 for (;;)
138 { 327 {
139 w = tw[0]; 328 tval.tv_sec = 0;
140 329 tval.TV_FRAC = 0;
141 for (time_watcher **i = tw.begin (); i < tw.end (); ++i) 330 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 } 331 }
332 else
333#endif
334 {
335#if IOM_TIME
336 // find earliest active watcher
337 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
154 338
339 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
340 if (*i && (*i)->at < next->at)
341 next = *i;
342
343 if (next->at > NOW && next != tw[0])
344 {
155 double diff = w->at - NOW; 345 double diff = next->at - NOW;
156 struct timeval to;
157 to.tv_sec = (int)diff; 346 tval.tv_sec = (int)diff;
158 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 347 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
348 to = &tval;
349 }
350 }
159#endif 351#endif
160 352
161#if IOM_IO 353#if IOM_IO || IOM_SIG
162 fd_set rfd, wfd; 354 fd_set rfd, wfd;
163 355
164 FD_ZERO (&rfd); 356 FD_ZERO (&rfd);
165 FD_ZERO (&wfd); 357 FD_ZERO (&wfd);
166 358
167 int fds = 0; 359 int fds = 0;
168 360
169 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 361# if IOM_IO
362 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
363 if (*i)
364 {
365 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
366 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
367
368 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
369 }
370# endif
371
372 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
373 break; // no events
374
375# if IOM_SIG
376 FD_SET (sigpipe[0], &rfd);
377 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
378# endif
379
380# if IOM_SIG
381 // there is no race, as we use a pipe for signals, so select
382 // will return if a signal is caught.
383 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
384# endif
385 fds = select (fds, &rfd, &wfd, NULL, to);
386# if IOM_SIG
387 sigprocmask (SIG_BLOCK, &sigs, NULL);
388# endif
389
390# if IOM_TIME
391 {
392 // update time, try to compensate for gross non-monotonic time changes
393 tstamp diff = NOW;
394 set_now ();
395 diff = NOW - diff;
396
397 if (diff < 0)
398 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
399 if (*i)
400 (*i)->at += diff;
401 }
402# endif
403
404 if (fds > 0)
170 { 405 {
171 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 406# if IOM_SIG
172 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 407 if (FD_ISSET (sigpipe[0], &rfd))
408 {
409 char ch;
173 410
174 if ((*w)->fd > fds) fds = (*w)->fd; 411 while (read (sigpipe[0], &ch, 1) > 0)
412 ;
413
414 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
415 if (*svp && (*svp)->pending)
416 {
417 sig_vec &sv = **svp;
418 for (int i = sv.size (); i--; )
419 if (!sv[i])
420 sv.erase_unordered (i);
421 else
422 sv[i]->call (*sv[i]);
423
424 sv.pending = false;
425 }
426 }
427# endif
428
429# if IOM_IO
430 for (int i = iow.size (); i--; )
431 if (!iow[i])
432 iow.erase_unordered (i);
433 else
434 {
435 io_watcher &w = *iow[i];
436 short revents = w.events;
437
438 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ;
439 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE;
440
441 if (revents)
442 w.call (w, revents);
443 }
444#endif
175 } 445 }
176 446 else if (fds < 0 && errno != EINTR)
447 {
448 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
449 abort ();
450 }
177# if IOM_TIME 451#if IOM_IDLE
178 fds = select (fds + 1, &rfd, &wfd, 0, &to); 452 else
179 set_now (); 453 for (int i = iw.size (); i--; )
180# else 454 if (!iw[i])
181 fds = select (fds + 1, &rfd, &wfd, 0, 0); 455 iw.erase_unordered (i);
456 else
457 iw[i]->call (*iw[i]);
182# endif 458#endif
183 459
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 460#elif IOM_TIME
461 if (!to)
462 break;
463
199 select (0, 0, 0, 0, &to); 464 select (0, 0, 0, 0, &to);
200 set_now (); 465 set_now ();
466#else
467 break;
201#endif 468#endif
469 }
202} 470}
203 471
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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