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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.9 by pcg, Sat Jan 17 01:20:01 2004 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, 2004 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*/
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>
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
28 51
29// TSTAMP_MAX must still fit into a positive struct timeval 52#if IOM_IO
30#define TSTAMP_MAX (double)(1UL<<31) 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;
31 94
32tstamp 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
33static bool iom_valid; 112static bool iom_valid;
34io_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}
35 158
36template<class watcher> 159template<class watcher>
37void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 160void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
38{ 161{
39 if (!iom_valid) 162 init::required ();
40 abort ();
41 163
42 if (!w->active) 164 if (!w.active)
43 { 165 {
44 queue.push_back (w); 166 queue.push_back (&w);
45 w->active = queue.size (); 167 w.active = queue.size ();
46 } 168 }
47} 169}
48 170
49template<class watcher> 171template<class watcher>
50void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 172void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
51{ 173{
52 if (!iom_valid) 174 if (!iom_valid)
53 return; 175 return;
54 176
55 if (w->active) 177 if (w.active)
56 { 178 {
57 queue [w->active - 1] = 0; 179 queue [w.active - 1] = 0;
58 w->active = 0; 180 w.active = 0;
59 } 181 }
60} 182}
61 183
62#if IOM_TIME 184#if IOM_TIME
63void time_watcher::trigger () 185void time_watcher::trigger ()
64{ 186{
65 call (*this); 187 call (*this);
66 188 io_manager::reg (*this);
67 iom.reg (this);
68} 189}
69 190
70void io_manager::reg (time_watcher *w) { reg (w, tw); } 191void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
71void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 192void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
72#endif 193#endif
73 194
74#if IOM_IO 195#if IOM_IO
75void io_manager::reg (io_watcher *w) { reg (w, iow); } 196void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
76void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 197void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
77#endif 198#endif
78 199
79#if IOM_CHECK 200#if IOM_CHECK
80void io_manager::reg (check_watcher *w) { reg (w, cw); } 201void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
81void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 202void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
82#endif 203#endif
83 204
84#if IOM_IDLE 205#if IOM_IDLE
85void io_manager::reg (idle_watcher *w) { reg (w, iw); } 206void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
86void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 207void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
87#endif 208#endif
88 209
89#if IOM_TIME 210#if IOM_SIG
90inline void set_now (void) 211static void
212sighandler (int signum)
91{ 213{
92 struct timeval tv; 214 sw [signum - 1]->pending = true;
93 215
94 gettimeofday (&tv, 0); 216 // we use a pipe for signal notifications, as most current
95 217 // OSes (Linux...) do not implement pselect correctly. ugh.
96 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 218 char ch = signum; // actual content not used
97#endif 219 write (sigpipe[1], &ch, 1);
98} 220}
221
222void io_manager::reg (sig_watcher &w)
223{
224 init::required ();
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
258void io_manager::unreg (sig_watcher &w)
259{
260 if (!w.active || !iom_valid)
261 return;
262
263 assert (0 < w.signum && w.signum <= sw.size ());
264
265 io_manager::unreg (w, *sw[w.signum - 1]);
266}
267
268void sig_watcher::start (int signum)
269{
270 stop ();
271 this->signum = signum;
272 io_manager::reg (*this);
273}
274#endif
99 275
100void io_manager::loop () 276void io_manager::loop ()
101{ 277{
278 init::required ();
279
102#if IOM_TIME 280#if IOM_TIME
103 set_now (); 281 set_now ();
104#endif 282#endif
105 283
106 for (;;) 284 for (;;)
107 { 285 {
108 struct timeval *to = 0;
109 struct timeval tval;
110 286
111#if IOM_IDLE 287#if IOM_TIME
112 if (iw.size ()) 288 // call pending time watchers
113 { 289 {
114 tval.tv_sec = 0; 290 bool activity;
115 tval.tv_usec = 0; 291
116 to = &tval;
117 } 292 do
118 else
119#endif
120 {
121#if IOM_TIME
122 time_watcher *next;
123
124 for (;;)
125 { 293 {
126 next = tw[0]; // the first time-watcher must exist at ALL times 294 activity = false;
127 295
128 for (int i = tw.size (); i--; ) 296 for (int i = tw.size (); i--; )
129 if (!tw[i]) 297 if (!tw[i])
130 tw.erase_unordered (i); 298 tw.erase_unordered (i);
131 else if (tw[i]->at < next->at) 299 else if (tw[i]->at <= NOW)
132 next = tw[i];
133
134 if (next->at > NOW)
135 { 300 {
136 if (next != tw[0]) 301 time_watcher &w = *tw[i];
137 { 302
138 double diff = next->at - NOW;
139 tval.tv_sec = (int)diff;
140 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000);
141 to = &tval;
142 }
143 break; 303 unreg (w);
304 w.call (w);
305
306 activity = true;
144 } 307 }
145 else
146 {
147 unreg (next);
148 next->call (*next);
149 }
150 } 308 }
151#endif 309 while (activity);
152 } 310 }
311#endif
153 312
154#if IOM_CHECK 313#if IOM_CHECK
314 // call all check watchers
155 for (int i = cw.size (); i--; ) 315 for (int i = cw.size (); i--; )
156 if (!cw[i]) 316 if (!cw[i])
157 cw.erase_unordered (i); 317 cw.erase_unordered (i);
158 else 318 else
159 cw[i]->call (*cw[i]); 319 cw[i]->call (*cw[i]);
160#endif 320#endif
161 321
322 struct TIMEVAL *to = 0;
323 struct TIMEVAL tval;
324
162#if IOM_IO 325#if IOM_IDLE
326 if (iw.size ())
327 {
328 tval.tv_sec = 0;
329 tval.TV_FRAC = 0;
330 to = &tval;
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
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 {
345 double diff = next->at - NOW;
346 tval.tv_sec = (int)diff;
347 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
348 to = &tval;
349 }
350 }
351#endif
352
353#if IOM_IO || IOM_SIG
163 fd_set rfd, wfd, efd; 354 fd_set rfd, wfd;
164 355
165 FD_ZERO (&rfd); 356 FD_ZERO (&rfd);
166 FD_ZERO (&wfd); 357 FD_ZERO (&wfd);
167 358
168 int fds = 0; 359 int fds = 0;
169 360
361# if IOM_IO
170 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); ) 362 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
171 if (*i) 363 if (*i)
172 { 364 {
173 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 365 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
174 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 366 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
175 367
176 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 368 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
177 } 369 }
370# endif
178 371
179 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 372 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
180 break; // no events 373 break; // no events
181 374
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
182 fds = select (fds, &rfd, &wfd, &efd, to); 385 fds = select (fds, &rfd, &wfd, NULL, to);
386# if IOM_SIG
387 sigprocmask (SIG_BLOCK, &sigs, NULL);
388# endif
389
183# if IOM_TIME 390# if IOM_TIME
391 {
392 // update time, try to compensate for gross non-monotonic time changes
393 tstamp diff = NOW;
184 set_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 }
185# endif 402# endif
186 403
187 if (fds > 0) 404 if (fds > 0)
188 for (int i = iow.size (); i--; ) 405 {
189 if (!iow[i]) 406# if IOM_SIG
190 iow.erase_unordered (i); 407 if (FD_ISSET (sigpipe[0], &rfd))
191 else
192 { 408 {
193 short revents = iow[i]->events; 409 char ch;
194 410
195 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 411 while (read (sigpipe[0], &ch, 1) > 0)
196 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 412 ;
197 413
198 if (revents) 414 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
199 iow[i]->call (*iow[i], revents); 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 }
200 } 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
445 }
201 else if (fds < 0 && errno != EINTR) 446 else if (fds < 0 && errno != EINTR)
202 { 447 {
203 perror ("Error while waiting for I/O or time event"); 448 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
204 abort (); 449 abort ();
205 } 450 }
206#if IOM_IDLE 451#if IOM_IDLE
207 else 452 else
208 for (int i = iw.size (); i--; ) 453 for (int i = iw.size (); i--; )
… …
222 break; 467 break;
223#endif 468#endif
224 } 469 }
225} 470}
226 471
227// this is a dummy time watcher to ensure that the first
228// time watcher is _always_ valid, this gets rid of a lot
229// of null-pointer-checks
230static struct tw0 : time_watcher {
231 void cb (time_watcher &w)
232 {
233 // should never get called
234 // reached end-of-time, or tstamp has a bogus definition :)
235 abort ();
236 }
237
238 tw0()
239 : time_watcher (this, &tw0::cb)
240 { }
241} tw0;
242
243io_manager::io_manager ()
244{
245 iom_valid = true;
246
247#if IOM_TIME
248 set_now ();
249
250 tw0.start (TSTAMP_MAX);
251#endif
252}
253
254io_manager::~io_manager ()
255{
256 iom_valid = false;
257}
258

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