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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.7 by pcg, Fri Dec 19 06:17:03 2003 UTC vs.
Revision 1.25 by root, Wed Dec 15 02:53:49 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
99tstamp io_manager::now ()
100{
101 struct timeval tv;
102
103 gettimeofday (&tv, 0);
104 return (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000.;
105}
106
107void io_manager::set_now ()
108{
109 NOW = now ();
110}
111#endif
112
30bool iom_valid; 113static bool iom_valid;
31io_manager iom; 114
115// used for initialisation only
116static struct init {
117 init ()
118 {
119#if IOM_SIG
120 sigemptyset (&sigs);
121
122 if (pipe (sigpipe))
123 {
124 perror ("io_manager: unable to create signal pipe, aborting.");
125 abort ();
126 }
127
128 fcntl (sigpipe[0], F_SETFL, O_NONBLOCK); fcntl (sigpipe[0], F_SETFD, FD_CLOEXEC);
129 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK); fcntl (sigpipe[1], F_SETFD, FD_CLOEXEC);
130#endif
131
132 iom_valid = true;
133
134#if IOM_TIME
135 io_manager::set_now ();
136
137 tw0.start (TSTAMP_MAX);
138#endif
139 }
140
141 static void required ();
142} init;
143
144void
145init::required ()
146{
147 if (!iom_valid)
148 {
149 write (2, "io_manager: early registration attempt, aborting.\n",
150 sizeof ("io_manager: early registration attempt, aborting.\n") - 1);
151 abort ();
152 }
153}
32 154
33template<class watcher> 155template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 156void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
35{ 157{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 158 init::required ();
159
160 if (!w.active)
161 {
37 queue.push_back (w); 162 queue.push_back (&w);
163 w.active = queue.size ();
164 }
38} 165}
39 166
40template<class watcher> 167template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 168void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
42{ 169{
43 queue.erase (find (queue.begin (), queue.end (), w)); 170 if (!iom_valid)
171 return;
172
173 if (w.active)
174 {
175 queue [w.active - 1] = 0;
176 w.active = 0;
177 }
44} 178}
179
180#if IOM_TIME
181void time_watcher::trigger ()
182{
183 call (*this);
184 io_manager::reg (*this);
185}
186
187void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
188void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
189#endif
45 190
46#if IOM_IO 191#if IOM_IO
47io_watcher::~io_watcher () 192void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
48{ 193void 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 194#endif
91 195
92#if IOM_CHECK 196#if IOM_CHECK
93check_watcher::~check_watcher () 197void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
94{ 198void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
95 if (iom_valid)
96 iom.unreg (this);
97}
98
99void io_manager::reg (check_watcher *w)
100{
101 reg (w, cw);
102}
103
104void io_manager::unreg (check_watcher *w)
105{
106 unreg (w, cw);
107}
108#endif 199#endif
109 200
110#if IOM_IDLE 201#if IOM_IDLE
111idle_watcher::~idle_watcher () 202void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
112{ 203void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
113 if (iom_valid) 204#endif
114 iom.unreg (this);
115}
116 205
206#if IOM_SIG
207static void
208sighandler (int signum)
209{
210 sw [signum - 1]->pending = true;
211
212 // we use a pipe for signal notifications, as most current
213 // OSes (Linux...) do not implement pselect correctly. ugh.
214 char ch = signum; // actual content not used
215 write (sigpipe[1], &ch, 1);
216}
217
117void io_manager::reg (idle_watcher *w) 218void io_manager::reg (sig_watcher &w)
118{ 219{
119 reg (w, iw); 220 assert (0 < w.signum);
120}
121 221
222 sw.reserve (w.signum);
223
224 while (sw.size () < w.signum) // pathetic
225 sw.push_back (0);
226
227 sig_vec *&sv = sw[w.signum - 1];
228
229 if (!sv)
230 {
231 sv = new sig_vec;
232
233 sigaddset (&sigs, w.signum);
234 sigprocmask (SIG_BLOCK, &sigs, NULL);
235
236 struct sigaction sa;
237 sa.sa_handler = sighandler;
238 sigfillset (&sa.sa_mask);
239 sa.sa_flags = SA_RESTART;
240
241 if (sigaction (w.signum, &sa, 0))
242 {
243 perror ("io_manager: error while installing signal handler, ignoring.");
244 abort ();
245 }
246
247 }
248
249 io_manager::reg (w, *sv);
250}
251
122void io_manager::unreg (idle_watcher *w) 252void io_manager::unreg (sig_watcher &w)
123{ 253{
124 unreg (w, iw); 254 if (!w.active)
125} 255 return;
126#endif
127 256
128#if IOM_TIME 257 assert (0 < w.signum && w.signum <= sw.size ());
129inline void set_now (void) 258
130{ 259 io_manager::unreg (w, *sw[w.signum - 1]);
131 struct timeval tv;
132
133 gettimeofday (&tv, 0);
134
135 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
136#endif
137} 260}
261
262void sig_watcher::start (int signum)
263{
264 stop ();
265 this->signum = signum;
266 io_manager::reg (*this);
267}
268#endif
138 269
139void io_manager::loop () 270void io_manager::loop ()
140{ 271{
272 init::required ();
273
141#if IOM_TIME 274#if IOM_TIME
142 set_now (); 275 set_now ();
143#endif 276#endif
144 277
145 for (;;) 278 for (;;)
146 { 279 {
280
281#if IOM_TIME
282 // call pending time watchers
283 {
284 bool activity;
285
286 do
287 {
288 activity = false;
289
290 for (int i = tw.size (); i--; )
291 if (!tw[i])
292 tw.erase_unordered (i);
293 else if (tw[i]->at <= NOW)
294 {
295 time_watcher &w = *tw[i];
296
297 unreg (w);
298 w.call (w);
299
300 activity = true;
301 }
302 }
303 while (activity);
304 }
305#endif
306
307#if IOM_CHECK
308 // call all check watchers
309 for (int i = cw.size (); i--; )
310 if (!cw[i])
311 cw.erase_unordered (i);
312 else
313 cw[i]->call (*cw[i]);
314#endif
315
147 struct timeval *to = 0; 316 struct TIMEVAL *to = 0;
148 struct timeval tval; 317 struct TIMEVAL tval;
149 318
150#if IOM_IDLE 319#if IOM_IDLE
151 if (iw.size ()) 320 if (iw.size ())
152 { 321 {
153 tval.tv_sec = 0; 322 tval.tv_sec = 0;
154 tval.tv_usec = 0; 323 tval.TV_FRAC = 0;
155 to = &tval; 324 to = &tval;
156 } 325 }
157 else 326 else
158#endif 327#endif
159 { 328 {
160#if IOM_TIME 329#if IOM_TIME
161 time_watcher *w; 330 // find earliest active watcher
331 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
162 332
163 for (;tw.size ();) 333 for (io_manager_vec<time_watcher>::const_iterator i = tw.end (); i-- > tw.begin (); )
334 if (*i && (*i)->at < next->at)
335 next = *i;
336
337 if (next->at > NOW && next != tw[0])
164 { 338 {
165 w = tw[0];
166
167 for (time_watcher **i = tw.begin (); i < tw.end (); ++i)
168 if ((*i)->at < w->at)
169 w = *i;
170
171 if (w->at > NOW)
172 {
173 double diff = w->at - NOW; 339 double diff = next->at - NOW;
174 tval.tv_sec = (int)diff; 340 tval.tv_sec = (int)diff;
175 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 341 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
176 to = &tval; 342 to = &tval;
177 break;
178 }
179 else if (w->at >= 0)
180 w->call (*w);
181 else
182 unreg (w);
183 } 343 }
184#endif
185 } 344 }
186
187#if IOM_CHECK
188 for (int i = 0; i < cw.size (); ++i)
189 cw[i]->call (*cw[i]);
190#endif 345#endif
191 346
192#if IOM_IO 347#if IOM_IO || IOM_SIG
193 fd_set rfd, wfd; 348 fd_set rfd, wfd;
194 349
195 FD_ZERO (&rfd); 350 FD_ZERO (&rfd);
196 FD_ZERO (&wfd); 351 FD_ZERO (&wfd);
197 352
198 int fds = 0; 353 int fds = 0;
199 354
200 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 355# if IOM_IO
356 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
357 if (*i)
201 { 358 {
202 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 359 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
203 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 360 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
204 361
205 if ((*w)->fd >= fds) fds = (*w)->fd + 1; 362 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
206 } 363 }
364# endif
207 365
208 if (!to && !fds) 366 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
209 break; // no events 367 break; // no events
210 368
369# if IOM_SIG
370 FD_SET (sigpipe[0], &rfd);
371 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
372# endif
373
374# if IOM_SIG
375 // there is no race, as we use a pipe for signals, so select
376 // will return if a signal is caught.
377 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
378# endif
211 fds = select (fds, &rfd, &wfd, 0, to); 379 fds = select (fds, &rfd, &wfd, NULL, to);
380# if IOM_SIG
381 sigprocmask (SIG_BLOCK, &sigs, NULL);
382# endif
383
212# if IOM_TIME 384# if IOM_TIME
213 set_now (); 385 set_now ();
214# endif 386# endif
215 387
216 if (fds > 0) 388 if (fds > 0)
217 for (int i = 0; i < iow.size (); ++i) 389 {
390# if IOM_SIG
391 if (FD_ISSET (sigpipe[0], &rfd))
218 { 392 {
219 io_watcher *w = iow[i]; 393 char ch;
220 394
395 while (read (sigpipe[0], &ch, 1) > 0)
396 ;
397
398 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
399 if (*svp && (*svp)->pending)
400 {
401 sig_vec &sv = **svp;
402 for (int i = sv.size (); i--; )
403 if (!sv[i])
404 sv.erase_unordered (i);
405 else
406 sv[i]->call (*sv[i]);
407
408 sv.pending = false;
409 }
410 }
411# endif
412
413# if IOM_IO
414 for (int i = iow.size (); i--; )
415 if (!iow[i])
416 iow.erase_unordered (i);
417 else
418 {
221 short revents = w->events; 419 short revents = iow[i]->events;
222 420
223 if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ; 421 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
224 if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE; 422 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
225 423
226 if (revents) 424 if (revents)
227 w->call (*w, revents); 425 iow[i]->call (*iow[i], revents);
426 }
427#endif
228 } 428 }
429 else if (fds < 0 && errno != EINTR)
430 {
431 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
432 abort ();
433 }
229#if IOM_IDLE 434#if IOM_IDLE
230 else if (iw.size ()) 435 else
231 for (int i = 0; i < iw.size (); ++i) 436 for (int i = iw.size (); i--; )
437 if (!iw[i])
438 iw.erase_unordered (i);
439 else
232 iw[i]->call (*iw[i]); 440 iw[i]->call (*iw[i]);
233#endif 441#endif
234 442
235#elif IOM_TIME 443#elif IOM_TIME
236 if (!to) 444 if (!to)
237 break; 445 break;
… …
242 break; 450 break;
243#endif 451#endif
244 } 452 }
245} 453}
246 454
247io_manager::io_manager ()
248{
249#if IOM_TIME
250 set_now ();
251#endif
252
253 iom_valid = true;
254}
255
256io_manager::~io_manager ()
257{
258 iom_valid = false;
259}
260

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