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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.17 by root, Tue Aug 10 20:39:19 2004 UTC vs.
Revision 1.24 by root, Sat Dec 11 17:18:29 2004 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 <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
… …
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 "iom.h"
21
20#include <cstdio> 22#include <cstdio>
21#include <cstdlib> 23#include <cstdlib>
22#include <cerrno> 24#include <cerrno>
23 25
24#include <sys/time.h> 26#include <sys/time.h>
… …
26#include <assert.h> 28#include <assert.h>
27 29
28#if 1 // older unices need these includes for select (2) 30#if 1 // older unices need these includes for select (2)
29# include <unistd.h> 31# include <unistd.h>
30# include <sys/types.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>
31#endif 40#endif
32 41
33// if the BSDs would at least be marginally POSIX-compatible.. *sigh* 42// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
34// until that happens, sys/select.h must come last 43// until that happens, sys/select.h must come last
35#include <sys/select.h> 44#include <sys/select.h>
36 45
37// for IOM_SIG
38#include <signal.h>
39
40#include "iom.h"
41
42// TSTAMP_MAX must still fit into a positive struct timeval 46// TSTAMP_MAX must still fit into a positive struct timeval
43#define TSTAMP_MAX (double)(1UL<<31) 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
44 76
45// this is a dummy time watcher to ensure that the first 77// this is a dummy time watcher to ensure that the first
46// time watcher is _always_ valid, this gets rid of a lot 78// time watcher is _always_ valid, this gets rid of a lot
47// of null-pointer-checks 79// of null-pointer-checks
48// (must come _before_ iom is being defined) 80// (must come _before_ iom is being defined)
… …
55 // or compiler initialisation order broken, or something else :) 87 // or compiler initialisation order broken, or something else :)
56 abort (); 88 abort ();
57 } 89 }
58 90
59 tw0 () 91 tw0 ()
60 : time_watcher (this, &tw0::cb) 92 : time_watcher (this, &tw0::cb)
61 { } 93 { }
62 } tw0; 94 } tw0;
63 95
64tstamp 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
65static bool iom_valid; 113static bool iom_valid;
66io_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);
129 fcntl (sigpipe[1], F_SETFL, O_NONBLOCK);
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}
67 154
68template<class watcher> 155template<class watcher>
69void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 156void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
70{ 157{
71 if (!iom_valid) 158 init::required ();
72 abort ();
73 159
74 if (!w->active) 160 if (!w.active)
75 { 161 {
76#if IOM_CHECK
77 queue.activity = true;
78#endif
79 queue.push_back (w); 162 queue.push_back (&w);
80 w->active = queue.size (); 163 w.active = queue.size ();
81 } 164 }
82} 165}
83 166
84template<class watcher> 167template<class watcher>
85void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 168void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
86{ 169{
87 if (!iom_valid) 170 if (!iom_valid)
88 return; 171 return;
89 172
90 if (w->active) 173 if (w.active)
91 { 174 {
92 queue [w->active - 1] = 0; 175 queue [w.active - 1] = 0;
93 w->active = 0; 176 w.active = 0;
94 } 177 }
95} 178}
96 179
97#if IOM_TIME 180#if IOM_TIME
98void time_watcher::trigger () 181void time_watcher::trigger ()
99{ 182{
100 call (*this); 183 call (*this);
101 184 io_manager::reg (*this);
102 iom.reg (this);
103} 185}
104 186
105void io_manager::reg (time_watcher *w) { reg (w, tw); } 187void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
106void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 188void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
107#endif 189#endif
108 190
109#if IOM_IO 191#if IOM_IO
110void io_manager::reg (io_watcher *w) { reg (w, iow); } 192void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
111void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 193void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
112#endif 194#endif
113 195
114#if IOM_CHECK 196#if IOM_CHECK
115void io_manager::reg (check_watcher *w) { reg (w, cw); } 197void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
116void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 198void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
117#endif 199#endif
118 200
119#if IOM_IDLE 201#if IOM_IDLE
120void io_manager::reg (idle_watcher *w) { reg (w, iw); } 202void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
121void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 203void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
122#endif
123
124#if IOM_TIME
125inline void set_now (void)
126{
127 struct timeval tv;
128
129 gettimeofday (&tv, 0);
130
131 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
132}
133#endif 204#endif
134 205
135#if IOM_SIG 206#if IOM_SIG
136// race conditions galore 207static void
137 208sighandler (int signum)
138void io_manager::sighandler (int signum)
139{ 209{
140 assert (0 < signum && signum <= iom.sw.size ()); 210 sw [signum - 1]->pending = true;
141 211
142 sig_vec &sv = *iom.sw [signum - 1]; 212 // we use a pipe for signal notifications, as most current
143 213 // OSes (Linux...) do not implement pselect correctly. ugh.
144 for (int i = sv.size (); i--; ) 214 char ch = signum; // actual content not used
145 if (!sv[i]) 215 write (sigpipe[1], &ch, 1);
146 sv.erase_unordered (i);
147 else
148 sv[i]->call (*sv[i]);
149} 216}
150 217
151void io_manager::reg (sig_watcher *w) 218void io_manager::reg (sig_watcher &w)
152{ 219{
153 assert (0 < w->signum); 220 assert (0 < w.signum);
154 221
155 sw.reserve (w->signum); 222 sw.reserve (w.signum);
156 223
224 while (sw.size () < w.signum) // pathetic
225 sw.push_back (0);
226
157 sig_vec *&sv = sw [w->signum - 1]; 227 sig_vec *&sv = sw[w.signum - 1];
158 228
159 if (!sv) 229 if (!sv)
160 { 230 {
161 sv = new sig_vec; 231 sv = new sig_vec;
162 232
233 sigaddset (&sigs, w.signum);
234 sigprocmask (SIG_BLOCK, &sigs, NULL);
235
163 struct sigaction sa; 236 struct sigaction sa;
164 sa.sa_handler = io_manager::sighandler; 237 sa.sa_handler = sighandler;
165 sigfillset (&sa.sa_mask); 238 sigfillset (&sa.sa_mask);
166 sa.sa_flags = 0; 239 sa.sa_flags = SA_RESTART;
167 240
168 if (sigaction (w->signum, &sa, 0)) 241 if (sigaction (w.signum, &sa, 0))
169 { 242 {
170 perror ("Error while installing signal handler"); 243 perror ("io_manager: error while installing signal handler, ignoring.");
171 abort (); 244 abort ();
172 } 245 }
173 }
174 246
175 reg (w, *sv); 247 }
176}
177 248
249 io_manager::reg (w, *sv);
250}
251
178void io_manager::unreg (sig_watcher *w) 252void io_manager::unreg (sig_watcher &w)
179{ 253{
254 if (!w.active)
255 return;
256
180 assert (0 < w->signum && w->signum <= sw.size ()); 257 assert (0 < w.signum && w.signum <= sw.size ());
181 258
182 unreg (w, *sw [w->signum - 1]); 259 io_manager::unreg (w, *sw[w.signum - 1]);
183} 260}
184 261
185void sig_watcher::start (int signum) 262void sig_watcher::start (int signum)
186{ 263{
187 stop (); 264 stop ();
188 this->signum = signum; 265 this->signum = signum;
189 iom.reg (this); 266 io_manager::reg (*this);
190} 267}
191#endif 268#endif
192 269
193void io_manager::loop () 270void io_manager::loop ()
194{ 271{
272 init::required ();
273
195#if IOM_TIME 274#if IOM_TIME
196 set_now (); 275 set_now ();
197#endif 276#endif
198 277
199 for (;;) 278 for (;;)
200 { 279 {
201 struct timeval *to = 0;
202 struct timeval tval;
203 280
204#if IOM_IDLE 281#if IOM_TIME
205 if (iw.size ()) 282 // call pending time watchers
206 { 283 {
207 tval.tv_sec = 0; 284 bool activity;
208 tval.tv_usec = 0; 285
209 to = &tval;
210 } 286 do
211 else
212#endif
213
214 {
215#if IOM_TIME
216 time_watcher *next;
217
218 for (;;)
219 { 287 {
220 next = tw[0]; // the first time-watcher must exist at ALL times 288 activity = false;
221 289
222 for (int i = tw.size (); i--; ) 290 for (int i = tw.size (); i--; )
223 if (!tw[i]) 291 if (!tw[i])
224 tw.erase_unordered (i); 292 tw.erase_unordered (i);
225 else if (tw[i]->at < next->at) 293 else if (tw[i]->at <= NOW)
226 next = tw[i];
227
228 if (next->at > NOW)
229 { 294 {
230 if (next != tw[0]) 295 time_watcher &w = *tw[i];
231 { 296
232 double diff = next->at - NOW;
233 tval.tv_sec = (int)diff;
234 tval.tv_usec = (int) ((diff - tval.tv_sec) * 1000000);
235 to = &tval;
236 }
237 break; 297 unreg (w);
298 w.call (w);
299
300 activity = true;
238 } 301 }
239 else
240 {
241 unreg (next);
242 next->call (*next);
243 }
244 } 302 }
245#endif 303 while (activity);
246
247 } 304 }
305#endif
248 306
249#if IOM_CHECK 307#if IOM_CHECK
250 tw.activity = false; 308 // call all check watchers
251
252 for (int i = cw.size (); i--; ) 309 for (int i = cw.size (); i--; )
253 if (!cw[i]) 310 if (!cw[i])
254 cw.erase_unordered (i); 311 cw.erase_unordered (i);
255 else 312 else
256 cw[i]->call (*cw[i]); 313 cw[i]->call (*cw[i]);
314#endif
257 315
258 if (tw.activity) 316 struct TIMEVAL *to = 0;
317 struct TIMEVAL tval;
318
319#if IOM_IDLE
320 if (iw.size ())
259 { 321 {
260 tval.tv_sec = 0; 322 tval.tv_sec = 0;
261 tval.tv_usec = 0; 323 tval.TV_FRAC = 0;
262 to = &tval; 324 to = &tval;
263 } 325 }
326 else
264#endif 327#endif
265 328 {
266#if IOM_IO 329#if IOM_TIME
330 // find earliest active watcher
331 time_watcher *next = tw[0]; // the first time-watcher must exist at ALL times
332
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])
338 {
339 double diff = next->at - NOW;
340 tval.tv_sec = (int)diff;
341 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
342 to = &tval;
343 }
344 }
345#endif
346
347#if IOM_IO || IOM_SIG
267 fd_set rfd, wfd; 348 fd_set rfd, wfd;
268 349
269 FD_ZERO (&rfd); 350 FD_ZERO (&rfd);
270 FD_ZERO (&wfd); 351 FD_ZERO (&wfd);
271 352
272 int fds = 0; 353 int fds = 0;
273 354
355# if IOM_IO
274 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); ) 356 for (io_manager_vec<io_watcher>::const_iterator i = iow.end (); i-- > iow.begin (); )
275 if (*i) 357 if (*i)
276 { 358 {
277 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 359 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
278 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 360 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
279 361
280 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 362 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
281 } 363 }
364# endif
282 365
283 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 366 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
284 break; // no events 367 break; // no events
285 368
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
286 fds = select (fds, &rfd, &wfd, NULL, to); 379 fds = select (fds, &rfd, &wfd, NULL, to);
380# if IOM_SIG
381 sigprocmask (SIG_BLOCK, &sigs, NULL);
382# endif
383
287# if IOM_TIME 384# if IOM_TIME
288 set_now (); 385 set_now ();
289# endif 386# endif
290 387
291 if (fds > 0) 388 if (fds > 0)
292 for (int i = iow.size (); i--; ) 389 {
293 if (!iow[i]) 390# if IOM_SIG
294 iow.erase_unordered (i); 391 if (FD_ISSET (sigpipe[0], &rfd))
295 else
296 { 392 {
297 short revents = iow[i]->events; 393 char ch;
298 394
299 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 395 while (read (sigpipe[0], &ch, 1) > 0)
300 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 396 ;
301 397
302 if (revents) 398 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
303 iow[i]->call (*iow[i], revents); 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 }
304 } 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 {
419 short revents = iow[i]->events;
420
421 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
422 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
423
424 if (revents)
425 iow[i]->call (*iow[i], revents);
426 }
427#endif
428 }
305 else if (fds < 0 && errno != EINTR) 429 else if (fds < 0 && errno != EINTR)
306 { 430 {
307 perror ("Error while waiting for I/O or time event"); 431 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
308 abort (); 432 abort ();
309 } 433 }
310#if IOM_IDLE 434#if IOM_IDLE
311 else 435 else
312 for (int i = iw.size (); i--; ) 436 for (int i = iw.size (); i--; )
… …
323 select (0, 0, 0, 0, &to); 447 select (0, 0, 0, 0, &to);
324 set_now (); 448 set_now ();
325#else 449#else
326 break; 450 break;
327#endif 451#endif
328
329 } 452 }
330} 453}
331 454
332io_manager::io_manager ()
333{
334 iom_valid = true;
335
336#if IOM_TIME
337 set_now ();
338
339 tw0.start (TSTAMP_MAX);
340#endif
341}
342
343io_manager::~io_manager ()
344{
345 iom_valid = false;
346}
347

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