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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.15 by pcg, Sun Mar 28 02:07:08 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>
25 27
28#include <assert.h>
29
26#if 1 // older unices need these includes for select (2) 30#if 1 // older unices need these includes for select (2)
27# include <unistd.h> 31# include <unistd.h>
28# 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>
29#endif 40#endif
30 41
31// if the BSDs would at least be marginally POSIX-compatible.. *sigh* 42// if the BSDs would at least be marginally POSIX-compatible.. *sigh*
32// until that happens, sys/select.h must come last 43// until that happens, sys/select.h must come last
33#include <sys/select.h> 44#include <sys/select.h>
34 45
35#include "iom.h"
36
37// TSTAMP_MAX must still fit into a positive struct timeval 46// TSTAMP_MAX must still fit into a positive struct timeval
38#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
39 76
40// this is a dummy time watcher to ensure that the first 77// this is a dummy time watcher to ensure that the first
41// time watcher is _always_ valid, this gets rid of a lot 78// time watcher is _always_ valid, this gets rid of a lot
42// of null-pointer-checks 79// of null-pointer-checks
43// (must come _before_ iom is being defined) 80// (must come _before_ iom is being defined)
… …
45 { 82 {
46 void cb (time_watcher &w) 83 void cb (time_watcher &w)
47 { 84 {
48 // should never get called 85 // should never get called
49 // reached end-of-time, or tstamp has a bogus definition, 86 // reached end-of-time, or tstamp has a bogus definition,
50 // or compiler initilization order broken, or somethine else :) 87 // or compiler initialisation order broken, or something else :)
51 abort (); 88 abort ();
52 } 89 }
53 90
54 tw0 () 91 tw0 ()
55 : time_watcher (this, &tw0::cb) 92 : time_watcher (this, &tw0::cb)
56 { }} 93 { }
57tw0; 94 } tw0;
58 95
59tstamp 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
60static bool iom_valid; 113static bool iom_valid;
61io_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}
62 154
63template<class watcher> 155template<class watcher>
64void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 156void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
65{ 157{
66 if (!iom_valid) 158 init::required ();
67 abort ();
68 159
69 if (!w->active) 160 if (!w.active)
70 { 161 {
71#if IOM_CHECK
72 queue.activity = true;
73#endif
74 queue.push_back (w); 162 queue.push_back (&w);
75 w->active = queue.size (); 163 w.active = queue.size ();
76 } 164 }
77} 165}
78 166
79template<class watcher> 167template<class watcher>
80void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 168void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
81{ 169{
82 if (!iom_valid) 170 if (!iom_valid)
83 return; 171 return;
84 172
85 if (w->active) 173 if (w.active)
86 { 174 {
87 queue [w->active - 1] = 0; 175 queue [w.active - 1] = 0;
88 w->active = 0; 176 w.active = 0;
89 } 177 }
90} 178}
91 179
92#if IOM_TIME 180#if IOM_TIME
93void time_watcher::trigger () 181void time_watcher::trigger ()
94{ 182{
95 call (*this); 183 call (*this);
96 184 io_manager::reg (*this);
97 iom.reg (this);
98} 185}
99 186
100void io_manager::reg (time_watcher *w) { reg (w, tw); } 187void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
101void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 188void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
102#endif 189#endif
103 190
104#if IOM_IO 191#if IOM_IO
105void io_manager::reg (io_watcher *w) { reg (w, iow); } 192void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
106void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 193void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
107#endif 194#endif
108 195
109#if IOM_CHECK 196#if IOM_CHECK
110void io_manager::reg (check_watcher *w) { reg (w, cw); } 197void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
111void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 198void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
112#endif 199#endif
113 200
114#if IOM_IDLE 201#if IOM_IDLE
115void io_manager::reg (idle_watcher *w) { reg (w, iw); } 202void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
116void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 203void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
117#endif 204#endif
118 205
119#if IOM_TIME 206#if IOM_SIG
120inline void set_now (void) 207static void
208sighandler (int signum)
121{ 209{
122 struct timeval tv; 210 sw [signum - 1]->pending = true;
123 211
124 gettimeofday (&tv, 0); 212 // we use a pipe for signal notifications, as most current
125 213 // OSes (Linux...) do not implement pselect correctly. ugh.
126 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 214 char ch = signum; // actual content not used
127#endif 215 write (sigpipe[1], &ch, 1);
128} 216}
217
218void io_manager::reg (sig_watcher &w)
219{
220 assert (0 < w.signum);
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
252void io_manager::unreg (sig_watcher &w)
253{
254 if (!w.active)
255 return;
256
257 assert (0 < w.signum && w.signum <= sw.size ());
258
259 io_manager::unreg (w, *sw[w.signum - 1]);
260}
261
262void sig_watcher::start (int signum)
263{
264 stop ();
265 this->signum = signum;
266 io_manager::reg (*this);
267}
268#endif
129 269
130void io_manager::loop () 270void io_manager::loop ()
131{ 271{
272 init::required ();
273
132#if IOM_TIME 274#if IOM_TIME
133 set_now (); 275 set_now ();
134#endif 276#endif
135 277
136 for (;;) 278 for (;;)
137 { 279 {
138 struct timeval *to = 0;
139 struct timeval tval;
140 280
141#if IOM_IDLE 281#if IOM_TIME
142 if (iw.size ()) 282 // call pending time watchers
143 { 283 {
144 tval.tv_sec = 0; 284 bool activity;
145 tval.tv_usec = 0; 285
146 to = &tval;
147 } 286 do
148 else
149#endif
150
151 {
152#if IOM_TIME
153 time_watcher *next;
154
155 for (;;)
156 { 287 {
157 next = tw[0]; // the first time-watcher must exist at ALL times 288 activity = false;
158 289
159 for (int i = tw.size (); i--; ) 290 for (int i = tw.size (); i--; )
160 if (!tw[i]) 291 if (!tw[i])
161 tw.erase_unordered (i); 292 tw.erase_unordered (i);
162 else if (tw[i]->at < next->at) 293 else if (tw[i]->at <= NOW)
163 next = tw[i];
164
165 if (next->at > NOW)
166 { 294 {
167 if (next != tw[0]) 295 time_watcher &w = *tw[i];
168 { 296
169 double diff = next->at - NOW;
170 tval.tv_sec = (int)diff;
171 tval.tv_usec = (int) ((diff - tval.tv_sec) * 1000000);
172 to = &tval;
173 }
174 break; 297 unreg (w);
298 w.call (w);
299
300 activity = true;
175 } 301 }
176 else
177 {
178 unreg (next);
179 next->call (*next);
180 }
181 } 302 }
182#endif 303 while (activity);
183
184 } 304 }
305#endif
185 306
186#if IOM_CHECK 307#if IOM_CHECK
187 tw.activity = false; 308 // call all check watchers
188
189 for (int i = cw.size (); i--; ) 309 for (int i = cw.size (); i--; )
190 if (!cw[i]) 310 if (!cw[i])
191 cw.erase_unordered (i); 311 cw.erase_unordered (i);
192 else 312 else
193 cw[i]->call (*cw[i]); 313 cw[i]->call (*cw[i]);
314#endif
194 315
195 if (tw.activity) 316 struct TIMEVAL *to = 0;
317 struct TIMEVAL tval;
318
319#if IOM_IDLE
320 if (iw.size ())
196 { 321 {
197 tval.tv_sec = 0; 322 tval.tv_sec = 0;
198 tval.tv_usec = 0; 323 tval.TV_FRAC = 0;
199 to = &tval; 324 to = &tval;
200 } 325 }
326 else
201#endif 327#endif
202 328 {
203#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
204 fd_set rfd, wfd; 348 fd_set rfd, wfd;
205 349
206 FD_ZERO (&rfd); 350 FD_ZERO (&rfd);
207 FD_ZERO (&wfd); 351 FD_ZERO (&wfd);
208 352
209 int fds = 0; 353 int fds = 0;
210 354
355# if IOM_IO
211 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 (); )
212 if (*i) 357 if (*i)
213 { 358 {
214 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 359 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
215 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 360 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
216 361
217 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 362 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
218 } 363 }
364# endif
219 365
220 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 366 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
221 break; // no events 367 break; // no events
222 368
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
223 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
224# if IOM_TIME 384# if IOM_TIME
225 set_now (); 385 set_now ();
226# endif 386# endif
227 387
228 if (fds > 0) 388 if (fds > 0)
229 for (int i = iow.size (); i--; ) 389 {
230 if (!iow[i]) 390# if IOM_SIG
231 iow.erase_unordered (i); 391 if (FD_ISSET (sigpipe[0], &rfd))
232 else
233 { 392 {
234 short revents = iow[i]->events; 393 char ch;
235 394
236 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 395 while (read (sigpipe[0], &ch, 1) > 0)
237 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 396 ;
238 397
239 if (revents) 398 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
240 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 }
241 } 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 }
242 else if (fds < 0 && errno != EINTR) 429 else if (fds < 0 && errno != EINTR)
243 { 430 {
244 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.");
245 abort (); 432 abort ();
246 } 433 }
247#if IOM_IDLE 434#if IOM_IDLE
248 else 435 else
249 for (int i = iw.size (); i--; ) 436 for (int i = iw.size (); i--; )
… …
260 select (0, 0, 0, 0, &to); 447 select (0, 0, 0, 0, &to);
261 set_now (); 448 set_now ();
262#else 449#else
263 break; 450 break;
264#endif 451#endif
265
266 } 452 }
267} 453}
268 454
269io_manager::io_manager ()
270{
271 iom_valid = true;
272
273#if IOM_TIME
274 set_now ();
275
276 tw0.start (TSTAMP_MAX);
277#endif
278}
279
280io_manager::~io_manager ()
281{
282 iom_valid = false;
283}
284

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