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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 1.31 by root, Wed Jan 11 21:23:39 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
31 75
32// this is a dummy time watcher to ensure that the first 76// this is a dummy time watcher to ensure that the first
33// time watcher is _always_ valid, this gets rid of a lot 77// time watcher is _always_ valid, this gets rid of a lot
34// of null-pointer-checks 78// of null-pointer-checks
35// (must come _before_ iom is being defined) 79// (must come _before_ iom is being defined)
36static struct tw0 : time_watcher { 80static struct tw0 : time_watcher
37 void cb (time_watcher &w)
38 { 81 {
82 void cb (time_watcher &w)
83 {
39 // should never get called 84 // should never get called
40 // reached end-of-time, or tstamp has a bogus definition, 85 // reached end-of-time, or tstamp has a bogus definition,
41 // or compiler initilization order broken, or somethine else :) 86 // or compiler initialisation order broken, or something else :)
42 abort (); 87 abort ();
88 }
89
90 tw0 ()
91 : time_watcher (this, &tw0::cb)
92 { }
93 } tw0;
94
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
112static bool iom_valid;
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
43 } 138 }
44 139
45 tw0() 140 ~init ()
46 : time_watcher (this, &tw0::cb) 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 ();
47 { } 156 }
48} tw0; 157}
49
50tstamp NOW;
51static bool iom_valid;
52io_manager iom;
53 158
54template<class watcher> 159template<class watcher>
55void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 160void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
56{ 161{
57 if (!iom_valid) 162 init::required ();
58 abort ();
59 163
60 if (!w->active) 164 if (!w.active)
61 { 165 {
62 queue.push_back (w); 166 queue.push_back (&w);
63 w->active = queue.size (); 167 w.active = queue.size ();
64 } 168 }
65} 169}
66 170
67template<class watcher> 171template<class watcher>
68void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 172void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
69{ 173{
70 if (!iom_valid) 174 if (!iom_valid)
71 return; 175 return;
72 176
73 if (w->active) 177 if (w.active)
74 { 178 {
75 queue [w->active - 1] = 0; 179 queue [w.active - 1] = 0;
76 w->active = 0; 180 w.active = 0;
77 } 181 }
78} 182}
79 183
80#if IOM_TIME 184#if IOM_TIME
81void time_watcher::trigger () 185void time_watcher::trigger ()
82{ 186{
83 call (*this); 187 call (*this);
84 188 io_manager::reg (*this);
85 iom.reg (this);
86} 189}
87 190
88void io_manager::reg (time_watcher *w) { reg (w, tw); } 191void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
89void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 192void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
90#endif 193#endif
91 194
92#if IOM_IO 195#if IOM_IO
93void io_manager::reg (io_watcher *w) { reg (w, iow); } 196void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
94void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 197void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
95#endif 198#endif
96 199
97#if IOM_CHECK 200#if IOM_CHECK
98void io_manager::reg (check_watcher *w) { reg (w, cw); } 201void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
99void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 202void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
100#endif 203#endif
101 204
102#if IOM_IDLE 205#if IOM_IDLE
103void io_manager::reg (idle_watcher *w) { reg (w, iw); } 206void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
104void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 207void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
105#endif 208#endif
106 209
107#if IOM_TIME 210#if IOM_SIG
108inline void set_now (void) 211static void
212sighandler (int signum)
109{ 213{
110 struct timeval tv; 214 sw [signum - 1]->pending = true;
111 215
112 gettimeofday (&tv, 0); 216 // we use a pipe for signal notifications, as most current
113 217 // OSes (Linux...) do not implement pselect correctly. ugh.
114 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 218 char ch = signum; // actual content not used
115#endif 219 write (sigpipe[1], &ch, 1);
116} 220}
221
222void io_manager::reg (sig_watcher &w)
223{
224 assert (0 < w.signum);
225
226 sw.reserve (w.signum);
227
228 while (sw.size () < w.signum) // pathetic
229 sw.push_back (0);
230
231 sig_vec *&sv = sw[w.signum - 1];
232
233 if (!sv)
234 {
235 sv = new sig_vec;
236
237 sigaddset (&sigs, w.signum);
238 sigprocmask (SIG_BLOCK, &sigs, NULL);
239
240 struct sigaction sa;
241 sa.sa_handler = sighandler;
242 sigfillset (&sa.sa_mask);
243 sa.sa_flags = SA_RESTART;
244
245 if (sigaction (w.signum, &sa, 0))
246 {
247 perror ("io_manager: error while installing signal handler, ignoring.");
248 abort ();
249 }
250
251 }
252
253 io_manager::reg (w, *sv);
254}
255
256void io_manager::unreg (sig_watcher &w)
257{
258 if (!w.active)
259 return;
260
261 assert (0 < w.signum && w.signum <= sw.size ());
262
263 io_manager::unreg (w, *sw[w.signum - 1]);
264}
265
266void sig_watcher::start (int signum)
267{
268 stop ();
269 this->signum = signum;
270 io_manager::reg (*this);
271}
272#endif
117 273
118void io_manager::loop () 274void io_manager::loop ()
119{ 275{
276 init::required ();
277
120#if IOM_TIME 278#if IOM_TIME
121 set_now (); 279 set_now ();
122#endif 280#endif
123 281
124 for (;;) 282 for (;;)
125 { 283 {
126 struct timeval *to = 0;
127 struct timeval tval;
128 284
129#if IOM_IDLE 285#if IOM_TIME
130 if (iw.size ()) 286 // call pending time watchers
131 { 287 {
132 tval.tv_sec = 0; 288 bool activity;
133 tval.tv_usec = 0; 289
134 to = &tval;
135 } 290 do
136 else
137#endif
138 {
139#if IOM_TIME
140 time_watcher *next;
141
142 for (;;)
143 { 291 {
144 next = tw[0]; // the first time-watcher must exist at ALL times 292 activity = false;
145 293
146 for (int i = tw.size (); i--; ) 294 for (int i = tw.size (); i--; )
147 if (!tw[i]) 295 if (!tw[i])
148 tw.erase_unordered (i); 296 tw.erase_unordered (i);
149 else if (tw[i]->at < next->at) 297 else if (tw[i]->at <= NOW)
150 next = tw[i];
151
152 if (next->at > NOW)
153 { 298 {
154 if (next != tw[0]) 299 time_watcher &w = *tw[i];
155 { 300
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; 301 unreg (w);
302 w.call (w);
303
304 activity = true;
162 } 305 }
163 else
164 {
165 unreg (next);
166 next->call (*next);
167 }
168 } 306 }
169#endif 307 while (activity);
170 } 308 }
309#endif
171 310
172#if IOM_CHECK 311#if IOM_CHECK
312 // call all check watchers
173 for (int i = cw.size (); i--; ) 313 for (int i = cw.size (); i--; )
174 if (!cw[i]) 314 if (!cw[i])
175 cw.erase_unordered (i); 315 cw.erase_unordered (i);
176 else 316 else
177 cw[i]->call (*cw[i]); 317 cw[i]->call (*cw[i]);
178#endif 318#endif
179 319
320 struct TIMEVAL *to = 0;
321 struct TIMEVAL tval;
322
180#if IOM_IO 323#if IOM_IDLE
324 if (iw.size ())
325 {
326 tval.tv_sec = 0;
327 tval.TV_FRAC = 0;
328 to = &tval;
329 }
330 else
331#endif
332 {
333#if IOM_TIME
334 // find earliest active watcher
335 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
336
337 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
338 if (*i && (*i)->at < next->at)
339 next = *i;
340
341 if (next->at > NOW && next != tw[0])
342 {
343 double diff = next->at - NOW;
344 tval.tv_sec = (int)diff;
345 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
346 to = &tval;
347 }
348 }
349#endif
350
351#if IOM_IO || IOM_SIG
181 fd_set rfd, wfd, efd; 352 fd_set rfd, wfd;
182 353
183 FD_ZERO (&rfd); 354 FD_ZERO (&rfd);
184 FD_ZERO (&wfd); 355 FD_ZERO (&wfd);
185 356
186 int fds = 0; 357 int fds = 0;
187 358
359# if IOM_IO
188 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); ) 360 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
189 if (*i) 361 if (*i)
190 { 362 {
191 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 363 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
192 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 364 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
193 365
194 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 366 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
195 } 367 }
368# endif
196 369
197 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 370 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
198 break; // no events 371 break; // no events
199 372
373# if IOM_SIG
374 FD_SET (sigpipe[0], &rfd);
375 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
376# endif
377
378# if IOM_SIG
379 // there is no race, as we use a pipe for signals, so select
380 // will return if a signal is caught.
381 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
382# endif
200 fds = select (fds, &rfd, &wfd, &efd, to); 383 fds = select (fds, &rfd, &wfd, NULL, to);
384# if IOM_SIG
385 sigprocmask (SIG_BLOCK, &sigs, NULL);
386# endif
387
201# if IOM_TIME 388# if IOM_TIME
389 {
390 // update time, try to compensate for gross non-monotonic time changes
391 tstamp diff = NOW;
202 set_now (); 392 set_now ();
393 diff = NOW - diff;
394
395 if (diff < 0)
396 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
397 if (*i)
398 (*i)->at += diff;
399 }
203# endif 400# endif
204 401
205 if (fds > 0) 402 if (fds > 0)
206 for (int i = iow.size (); i--; ) 403 {
207 if (!iow[i]) 404# if IOM_SIG
208 iow.erase_unordered (i); 405 if (FD_ISSET (sigpipe[0], &rfd))
209 else
210 { 406 {
211 short revents = iow[i]->events; 407 char ch;
212 408
213 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 409 while (read (sigpipe[0], &ch, 1) > 0)
214 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 410 ;
215 411
216 if (revents) 412 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
217 iow[i]->call (*iow[i], revents); 413 if (*svp && (*svp)->pending)
414 {
415 sig_vec &sv = **svp;
416 for (int i = sv.size (); i--; )
417 if (!sv[i])
418 sv.erase_unordered (i);
419 else
420 sv[i]->call (*sv[i]);
421
422 sv.pending = false;
423 }
218 } 424 }
425# endif
426
427# if IOM_IO
428 for (int i = iow.size (); i--; )
429 if (!iow[i])
430 iow.erase_unordered (i);
431 else
432 {
433 io_watcher &w = *iow[i];
434 short revents = w.events;
435
436 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ;
437 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE;
438
439 if (revents)
440 w.call (w, revents);
441 }
442#endif
443 }
219 else if (fds < 0 && errno != EINTR) 444 else if (fds < 0 && errno != EINTR)
220 { 445 {
221 perror ("Error while waiting for I/O or time event"); 446 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
222 abort (); 447 abort ();
223 } 448 }
224#if IOM_IDLE 449#if IOM_IDLE
225 else 450 else
226 for (int i = iw.size (); i--; ) 451 for (int i = iw.size (); i--; )
… …
240 break; 465 break;
241#endif 466#endif
242 } 467 }
243} 468}
244 469
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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