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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.3 by pcg, Tue Nov 25 17:11:33 2003 UTC vs.
Revision 1.23 by root, Sun Nov 14 22:24:09 2004 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 <pcg@goof.com>
4 4
5 This program is free software; you can redistribute it and/or modify 5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by 6 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 7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 8 (at your option) any later version.
… …
15 You should have received a copy of the GNU General Public License 15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software 16 along with this program; if not, write to the Free Software
17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/ 18*/
19 19
20#include "../config.h" 20#include "iom.h"
21 21
22#include <cstdio> 22#include <cstdio>
23#include <cstdlib>
24#include <cerrno>
23 25
26#include <sys/time.h>
27
28#include <assert.h>
29
30#if 1 // older unices need these includes for select (2)
31# include <unistd.h>
32# include <sys/types.h>
33# include <time.h>
34#endif
35
36// for IOM_SIG
37#if IOM_SIG
38# include <signal.h>
39# include <fcntl.h>
40#endif
41
42// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
43// until that happens, sys/select.h must come last
24#include <sys/select.h> 44#include <sys/select.h>
25#include <sys/time.h>
26 45
27#include "iom.h" 46// TSTAMP_MAX must still fit into a positive struct timeval
47#define TSTAMP_MAX (double)(1UL<<31)
48
49#define TIMEVAL timeval
50#define TV_FRAC tv_usec
51#define TV_MULT 1000000L
52
53#if IOM_IO
54static io_manager_vec<io_watcher> iow;
55#endif
56#if IOM_CHECK
57static io_manager_vec<check_watcher> cw;
58#endif
59#if IOM_TIME
60static io_manager_vec<time_watcher> tw;
61#endif
62#if IOM_IDLE
63static io_manager_vec<idle_watcher> iw;
64#endif
65#if IOM_SIG
66static int sigpipe[2]; // signal signalling pipe
67static sigset_t sigs;
68struct sig_vec : io_manager_vec<sig_watcher> {
69 int pending;
70 sig_vec ()
71 : pending (false)
72 { }
73};
74static vector<sig_vec *> sw;
75#endif
76
77// this is a dummy time watcher to ensure that the first
78// time watcher is _always_ valid, this gets rid of a lot
79// of null-pointer-checks
80// (must come _before_ iom is being defined)
81static struct tw0 : time_watcher
82 {
83 void cb (time_watcher &w)
84 {
85 // should never get called
86 // reached end-of-time, or tstamp has a bogus definition,
87 // or compiler initialisation order broken, or something else :)
88 abort ();
89 }
90
91 tw0 ()
92 : time_watcher (this, &tw0::cb)
93 { }
94 } tw0;
28 95
29tstamp NOW; 96tstamp NOW;
97
98#if IOM_TIME
99inline void set_now (void)
100{
101 struct timeval tv;
102
103 gettimeofday (&tv, 0);
104 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.;
105}
106#endif
107
30bool iom_valid; 108static bool iom_valid;
31io_manager iom;
32 109
110// used for initialisation only
111static struct init {
112 init ()
113 {
114#if IOM_SIG
115 sigemptyset (&sigs);
116
117 if (pipe (sigpipe))
118 {
119 perror ("io_manager: unable to create signal pipe, aborting.");
120 abort ();
121 }
122
123 fcntl (sigpipe[0], F_SETFL, O_NONBLOCK);
124 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK);
125#endif
126
127 iom_valid = true;
128
129#if IOM_TIME
130 set_now ();
131
132 tw0.start (TSTAMP_MAX);
133#endif
134 }
135
136 static void required ();
137} init;
138
139void
140init::required ()
141{
142 if (!iom_valid)
143 {
144 write (2, "io_manager: early registration attempt, aborting.\n",
145 sizeof ("io_manager: early registration attempt, aborting.\n") - 1);
146 abort ();
147 }
148}
149
150template<class watcher>
151void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
152{
153 init::required ();
154
155 if (!w.active)
156 {
157 queue.push_back (&w);
158 w.active = queue.size ();
159 }
160}
161
162template<class watcher>
163void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
164{
165 if (!iom_valid)
166 return;
167
168 if (w.active)
169 {
170 queue [w.active - 1] = 0;
171 w.active = 0;
172 }
173}
174
175#if IOM_TIME
33void time_watcher::trigger () 176void time_watcher::trigger ()
34{ 177{
35 call (*this); 178 call (*this);
36 179 io_manager::reg (*this);
37 iom.reg (this);
38} 180}
39 181
40time_watcher::~time_watcher () 182void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
41{ 183void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
42 if (iom_valid) 184#endif
43 iom.unreg (this);
44 185
45 at = TSTAMP_CANCEL; 186#if IOM_IO
46} 187void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
188void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
189#endif
47 190
48io_watcher::~io_watcher () 191#if IOM_CHECK
49{ 192void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
50 if (iom_valid) 193void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
51 iom.unreg (this); 194#endif
52}
53 195
196#if IOM_IDLE
197void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
198void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
199#endif
200
201#if IOM_SIG
202static void
203sighandler (int signum)
204{
205 sw [signum - 1]->pending = true;
206
207 // we use a pipe for signal notifications, as most current
208 // OSes (Linux...) do not implement pselect correctly. ugh.
209 char ch = signum; // actual content not used
210 write (sigpipe[1], &ch, 1);
211}
212
54void io_manager::reg (io_watcher *w) 213void io_manager::reg (sig_watcher &w)
55{ 214{
56 if (find (iow.begin (), iow.end (), w) == iow.end ()) 215 assert (0 < w.signum);
216
217 sw.reserve (w.signum);
218
219 while (sw.size () < w.signum) // pathetic
57 iow.push_back (w); 220 sw.push_back (0);
58}
59 221
222 sig_vec *&sv = sw[w.signum - 1];
223
224 if (!sv)
225 {
226 sv = new sig_vec;
227
228 sigaddset (&sigs, w.signum);
229 sigprocmask (SIG_BLOCK, &sigs, NULL);
230
231 struct sigaction sa;
232 sa.sa_handler = sighandler;
233 sigfillset (&sa.sa_mask);
234 sa.sa_flags = SA_RESTART;
235
236 if (sigaction (w.signum, &sa, 0))
237 {
238 perror ("io_manager: error while installing signal handler, ignoring.");
239 abort ();
240 }
241
242 }
243
244 io_manager::reg (w, *sv);
245}
246
60void io_manager::unreg (io_watcher *w) 247void io_manager::unreg (sig_watcher &w)
61{ 248{
62 iow.erase (find (iow.begin (), iow.end (), w)); 249 if (!w.active)
63} 250 return;
64 251
65void io_manager::reg (time_watcher *w) 252 assert (0 < w.signum && w.signum <= sw.size ());
66{ 253
67 if (find (tw.begin (), tw.end (), w) == tw.end ()) 254 io_manager::unreg (w, *sw[w.signum - 1]);
68 tw.push_back (w);
69} 255}
70 256
71void io_manager::unreg (time_watcher *w) 257void sig_watcher::start (int signum)
72{ 258{
73 tw.erase (find (tw.begin (), tw.end (), w)); 259 stop ();
260 this->signum = signum;
261 io_manager::reg (*this);
74} 262}
75 263#endif
76inline void set_now (void)
77{
78 struct timeval tv;
79
80 gettimeofday (&tv, 0);
81
82 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
83}
84 264
85void io_manager::loop () 265void io_manager::loop ()
86{ 266{
267 init::required ();
268
269#if IOM_TIME
87 set_now (); 270 set_now ();
271#endif
88 272
89 for (;;) 273 for (;;)
90 { 274 {
91 time_watcher *w;
92 275
93 for (;;) 276#if IOM_TIME
277 // call pending time watchers
278 {
279 bool activity;
280
281 do
282 {
283 activity = false;
284
285 for (int i = tw.size (); i--; )
286 if (!tw[i])
287 tw.erase_unordered (i);
288 else if (tw[i]->at <= NOW)
289 {
290 time_watcher &w = *tw[i];
291
292 unreg (w);
293 w.call (w);
294
295 activity = true;
296 }
297 }
298 while (activity);
299 }
300#endif
301
302#if IOM_CHECK
303 // call all check watchers
304 for (int i = cw.size (); i--; )
305 if (!cw[i])
306 cw.erase_unordered (i);
307 else
308 cw[i]->call (*cw[i]);
309#endif
310
311 struct TIMEVAL *to = 0;
312 struct TIMEVAL tval;
313
314#if IOM_IDLE
315 if (iw.size ())
94 { 316 {
95 w = tw[0]; 317 tval.tv_sec = 0;
96 318 tval.TV_FRAC = 0;
97 for (time_watcher **i = tw.begin (); i != tw.end (); ++i) 319 to = &tval;
98 if ((*i)->at < w->at)
99 w = *i;
100
101 if (w->at > NOW)
102 break;
103
104 // call it
105 w->call (*w);
106
107 if (w->at < 0)
108 unreg (w);
109 } 320 }
321 else
322#endif
323 {
324#if IOM_TIME
325 // find earliest active watcher
326 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
110 327
111 struct timeval to; 328 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
329 if (*i && (*i)->at < next->at)
330 next = *i;
331
332 if (next->at > NOW && next != tw[0])
333 {
112 double diff = w->at - NOW; 334 double diff = next->at - NOW;
113 to.tv_sec = (int)diff; 335 tval.tv_sec = (int)diff;
114 to.tv_usec = (int)((diff - to.tv_sec) * 1000000); 336 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
337 to = &tval;
338 }
339 }
340#endif
115 341
342#if IOM_IO || IOM_SIG
116 fd_set rfd, wfd; 343 fd_set rfd, wfd;
117 344
118 FD_ZERO (&rfd); 345 FD_ZERO (&rfd);
119 FD_ZERO (&wfd); 346 FD_ZERO (&wfd);
120 347
121 int fds = 0; 348 int fds = 0;
122 349
123 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 350# if IOM_IO
351 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
352 if (*i)
353 {
354 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
355 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
356
357 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
358 }
359# endif
360
361 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
362 break; // no events
363
364# if IOM_SIG
365 FD_SET (sigpipe[0], &rfd);
366 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
367# endif
368
369# if IOM_SIG
370 // there is no race, as we use a pipe for signals, so select
371 // will return if a signal is caught.
372 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
373# endif
374 fds = select (fds, &rfd, &wfd, NULL, to);
375# if IOM_SIG
376 sigprocmask (SIG_BLOCK, &sigs, NULL);
377# endif
378
379# if IOM_TIME
380 set_now ();
381# endif
382
383 if (fds > 0)
124 { 384 {
125 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 385# if IOM_SIG
126 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 386 if (FD_ISSET (sigpipe[0], &rfd))
387 {
388 char ch;
127 389
128 if ((*w)->fd > fds) fds = (*w)->fd; 390 while (read (sigpipe[0], &ch, 1) > 0)
391 ;
392
393 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
394 if (*svp && (*svp)->pending)
395 {
396 sig_vec &sv = **svp;
397 for (int i = sv.size (); i--; )
398 if (!sv[i])
399 sv.erase_unordered (i);
400 else
401 sv[i]->call (*sv[i]);
402
403 sv.pending = false;
404 }
405 }
406# endif
407
408# if IOM_IO
409 for (int i = iow.size (); i--; )
410 if (!iow[i])
411 iow.erase_unordered (i);
412 else
413 {
414 short revents = iow[i]->events;
415
416 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
417 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
418
419 if (revents)
420 iow[i]->call (*iow[i], revents);
421 }
422#endif
129 } 423 }
424 else if (fds < 0 && errno != EINTR)
425 {
426 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
427 abort ();
428 }
429#if IOM_IDLE
430 else
431 for (int i = iw.size (); i--; )
432 if (!iw[i])
433 iw.erase_unordered (i);
434 else
435 iw[i]->call (*iw[i]);
436#endif
130 437
131 fds = select (fds + 1, &rfd, &wfd, 0, &to); 438#elif IOM_TIME
439 if (!to)
440 break;
132 441
442 select (0, 0, 0, 0, &to);
133 set_now (); 443 set_now ();
134 444#else
135 if (fds > 0) 445 break;
136 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 446#endif
137 {
138 short revents = (*w)->events;
139
140 if (!FD_ISSET ((*w)->fd, &rfd)) revents &= ~EVENT_READ;
141 if (!FD_ISSET ((*w)->fd, &wfd)) revents &= ~EVENT_WRITE;
142
143 if (revents)
144 (*w)->call (**w, revents);
145 }
146 } 447 }
147} 448}
148 449
149void io_manager::idle_cb (time_watcher &w)
150{
151 w.at = NOW + 1000000000;
152}
153
154io_manager::io_manager ()
155{
156 set_now ();
157
158 iom_valid = true;
159
160 idle = new time_watcher (this, &io_manager::idle_cb);
161 idle->start (0);
162}
163
164io_manager::~io_manager ()
165{
166 iom_valid = false;
167}
168

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