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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.8 by pcg, Fri Jan 16 22:11:09 2004 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> 23#include <cstdlib>
24#include <cerrno> 24#include <cerrno>
25 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
26#include <sys/select.h> 44#include <sys/select.h>
27#include <sys/time.h>
28
29#include "iom.h"
30 45
31// TSTAMP_MAX must still fit into a positive struct timeval 46// TSTAMP_MAX must still fit into a positive struct timeval
32#define TSTAMP_MAX (double)(1UL<<31) 47#define TSTAMP_MAX (double)(1UL<<31)
33 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;
95
34tstamp 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
35static bool iom_valid; 108static bool iom_valid;
36io_manager iom; 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}
37 149
38template<class watcher> 150template<class watcher>
39void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 151void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
40{ 152{
41 if (!iom_valid) 153 init::required ();
42 abort ();
43 154
44 if (!w->active) 155 if (!w.active)
45 { 156 {
46 queue.push_back (w); 157 queue.push_back (&w);
47 w->active = queue.size (); 158 w.active = queue.size ();
48 } 159 }
49} 160}
50 161
51template<class watcher> 162template<class watcher>
52void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 163void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
53{ 164{
54 if (!iom_valid) 165 if (!iom_valid)
55 return; 166 return;
56 167
57 if (w->active) 168 if (w.active)
58 { 169 {
59 queue [w->active - 1] = 0; 170 queue [w.active - 1] = 0;
60 w->active = 0; 171 w.active = 0;
61 } 172 }
62} 173}
63 174
64#if IOM_TIME 175#if IOM_TIME
65void time_watcher::trigger () 176void time_watcher::trigger ()
66{ 177{
67 call (*this); 178 call (*this);
68 179 io_manager::reg (*this);
69 iom.reg (this);
70} 180}
71 181
72void io_manager::reg (time_watcher *w) { reg (w, tw); } 182void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
73void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 183void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
74#endif 184#endif
75 185
76#if IOM_IO 186#if IOM_IO
77void io_manager::reg (io_watcher *w) { reg (w, iow); } 187void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
78void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 188void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
79#endif 189#endif
80 190
81#if IOM_CHECK 191#if IOM_CHECK
82void io_manager::reg (check_watcher *w) { reg (w, cw); } 192void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
83void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 193void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
84#endif 194#endif
85 195
86#if IOM_IDLE 196#if IOM_IDLE
87void io_manager::reg (idle_watcher *w) { reg (w, iw); } 197void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
88void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 198void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
89#endif 199#endif
90 200
91#if IOM_TIME 201#if IOM_SIG
92inline void set_now (void) 202static void
203sighandler (int signum)
93{ 204{
94 struct timeval tv; 205 sw [signum - 1]->pending = true;
95 206
96 gettimeofday (&tv, 0); 207 // we use a pipe for signal notifications, as most current
97 208 // OSes (Linux...) do not implement pselect correctly. ugh.
98 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 209 char ch = signum; // actual content not used
99#endif 210 write (sigpipe[1], &ch, 1);
100} 211}
212
213void io_manager::reg (sig_watcher &w)
214{
215 assert (0 < w.signum);
216
217 sw.reserve (w.signum);
218
219 while (sw.size () < w.signum) // pathetic
220 sw.push_back (0);
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
247void io_manager::unreg (sig_watcher &w)
248{
249 if (!w.active)
250 return;
251
252 assert (0 < w.signum && w.signum <= sw.size ());
253
254 io_manager::unreg (w, *sw[w.signum - 1]);
255}
256
257void sig_watcher::start (int signum)
258{
259 stop ();
260 this->signum = signum;
261 io_manager::reg (*this);
262}
263#endif
101 264
102void io_manager::loop () 265void io_manager::loop ()
103{ 266{
267 init::required ();
268
104#if IOM_TIME 269#if IOM_TIME
105 set_now (); 270 set_now ();
106#endif 271#endif
107 272
108 for (;;) 273 for (;;)
109 { 274 {
110 struct timeval *to = 0;
111 struct timeval tval;
112 275
113#if IOM_IDLE 276#if IOM_TIME
114 if (iw.size ()) 277 // call pending time watchers
115 { 278 {
116 tval.tv_sec = 0; 279 bool activity;
117 tval.tv_usec = 0; 280
118 to = &tval;
119 } 281 do
120 else
121#endif
122 {
123#if IOM_TIME
124 time_watcher *next;
125
126 for (;;)
127 { 282 {
128 next = tw[0]; // the first time-watcher must exist at ALL times 283 activity = false;
129 284
130 for (int i = tw.size (); i--; ) 285 for (int i = tw.size (); i--; )
131 if (!tw[i]) 286 if (!tw[i])
132 tw.erase_unordered (i); 287 tw.erase_unordered (i);
133 else if (tw[i]->at < next->at) 288 else if (tw[i]->at <= NOW)
134 next = tw[i];
135
136 if (next->at > NOW)
137 { 289 {
138 if (next != tw[0]) 290 time_watcher &w = *tw[i];
139 { 291
140 double diff = next->at - NOW;
141 tval.tv_sec = (int)diff;
142 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000);
143 to = &tval;
144 }
145 break; 292 unreg (w);
293 w.call (w);
294
295 activity = true;
146 } 296 }
147 else if (next->at >= 0)
148 {
149 unreg (next);
150 next->call (*next);
151 }
152 } 297 }
153#endif 298 while (activity);
154 } 299 }
300#endif
155 301
156#if IOM_CHECK 302#if IOM_CHECK
303 // call all check watchers
157 for (int i = cw.size (); i--; ) 304 for (int i = cw.size (); i--; )
158 if (!cw[i]) 305 if (!cw[i])
159 cw.erase_unordered (i); 306 cw.erase_unordered (i);
160 else 307 else
161 cw[i]->call (*cw[i]); 308 cw[i]->call (*cw[i]);
162#endif 309#endif
163 310
311 struct TIMEVAL *to = 0;
312 struct TIMEVAL tval;
313
164#if IOM_IO 314#if IOM_IDLE
315 if (iw.size ())
316 {
317 tval.tv_sec = 0;
318 tval.TV_FRAC = 0;
319 to = &tval;
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
327
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 {
334 double diff = next->at - NOW;
335 tval.tv_sec = (int)diff;
336 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
337 to = &tval;
338 }
339 }
340#endif
341
342#if IOM_IO || IOM_SIG
165 fd_set rfd, wfd, efd; 343 fd_set rfd, wfd;
166 344
167 FD_ZERO (&rfd); 345 FD_ZERO (&rfd);
168 FD_ZERO (&wfd); 346 FD_ZERO (&wfd);
169 347
170 int fds = 0; 348 int fds = 0;
171 349
350# if IOM_IO
172 for (io_watcher **i = iow.end (); i-- > iow.begin (); ) 351 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
173 if (*i) 352 if (*i)
174 { 353 {
175 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 354 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
176 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 355 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
177 356
178 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 357 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
179 } 358 }
359# endif
180 360
181 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 361 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
182 break; // no events 362 break; // no events
183 363
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
184 fds = select (fds, &rfd, &wfd, &efd, to); 374 fds = select (fds, &rfd, &wfd, NULL, to);
375# if IOM_SIG
376 sigprocmask (SIG_BLOCK, &sigs, NULL);
377# endif
378
185# if IOM_TIME 379# if IOM_TIME
186 set_now (); 380 set_now ();
187# endif 381# endif
188 382
189 if (fds > 0) 383 if (fds > 0)
190 for (int i = iow.size (); i--; ) 384 {
191 if (!iow[i]) 385# if IOM_SIG
192 iow.erase_unordered (i); 386 if (FD_ISSET (sigpipe[0], &rfd))
193 else
194 { 387 {
195 short revents = iow[i]->events; 388 char ch;
196 389
197 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 390 while (read (sigpipe[0], &ch, 1) > 0)
198 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 391 ;
199 392
200 if (revents) 393 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
201 iow[i]->call (*iow[i], revents); 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 }
202 } 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
423 }
203 else if (fds < 0 && errno != EINTR) 424 else if (fds < 0 && errno != EINTR)
204 { 425 {
205 perror ("Error while waiting for I/O or time event"); 426 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
206 abort (); 427 abort ();
207 } 428 }
208#if IOM_IDLE 429#if IOM_IDLE
209 else 430 else
210 for (int i = iw.size (); i--; ) 431 for (int i = iw.size (); i--; )
… …
224 break; 445 break;
225#endif 446#endif
226 } 447 }
227} 448}
228 449
229// this is a dummy time watcher to ensure that the first
230// time watcher is _always_ valid, this gets rid of a lot
231// of null-pointer-checks
232static struct tw0 : time_watcher {
233 void cb (time_watcher &w)
234 {
235 // should never get called
236 // reached end-of-time, or tstamp has a bogus definition :)
237 abort ();
238 }
239
240 tw0()
241 : time_watcher (this, &tw0::cb)
242 { }
243} tw0;
244
245io_manager::io_manager ()
246{
247 iom_valid = true;
248
249#if IOM_TIME
250 set_now ();
251
252 tw0.start (TSTAMP_MAX);
253#endif
254}
255
256io_manager::~io_manager ()
257{
258 iom_valid = false;
259}
260

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