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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.10 by pcg, Sat Jan 17 14:10:40 2004 UTC vs.
Revision 1.27 by root, Mon Dec 20 16:44:31 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
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 <csignal>
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
27#include "iom.h"
28 45
29// TSTAMP_MAX must still fit into a positive struct timeval 46// TSTAMP_MAX must still fit into a positive struct timeval
30#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
31 76
32// this is a dummy time watcher to ensure that the first 77// this is a dummy time watcher to ensure that the first
33// time watcher is _always_ valid, this gets rid of a lot 78// time watcher is _always_ valid, this gets rid of a lot
34// of null-pointer-checks 79// of null-pointer-checks
35// (must come _before_ iom is being defined) 80// (must come _before_ iom is being defined)
36static struct tw0 : time_watcher { 81static struct tw0 : time_watcher
37 void cb (time_watcher &w)
38 { 82 {
83 void cb (time_watcher &w)
84 {
39 // should never get called 85 // should never get called
40 // reached end-of-time, or tstamp has a bogus definition, 86 // reached end-of-time, or tstamp has a bogus definition,
41 // or compiler initilization order broken, or somethine else :) 87 // or compiler initialisation order broken, or something else :)
42 abort (); 88 abort ();
89 }
90
91 tw0 ()
92 : time_watcher (this, &tw0::cb)
93 { }
94 } tw0;
95
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
113static bool iom_valid;
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
43 } 139 }
44 140
45 tw0() 141 static void required ();
46 : time_watcher (this, &tw0::cb) 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 ();
47 { } 152 }
48} tw0; 153}
49
50tstamp NOW;
51static bool iom_valid;
52io_manager iom;
53 154
54template<class watcher> 155template<class watcher>
55void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 156void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
56{ 157{
57 if (!iom_valid) 158 init::required ();
58 abort ();
59 159
60 if (!w->active) 160 if (!w.active)
61 { 161 {
62 queue.push_back (w); 162 queue.push_back (&w);
63 w->active = queue.size (); 163 w.active = queue.size ();
64 } 164 }
65} 165}
66 166
67template<class watcher> 167template<class watcher>
68void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 168void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
69{ 169{
70 if (!iom_valid) 170 if (!iom_valid)
71 return; 171 return;
72 172
73 if (w->active) 173 if (w.active)
74 { 174 {
75 queue [w->active - 1] = 0; 175 queue [w.active - 1] = 0;
76 w->active = 0; 176 w.active = 0;
77 } 177 }
78} 178}
79 179
80#if IOM_TIME 180#if IOM_TIME
81void time_watcher::trigger () 181void time_watcher::trigger ()
82{ 182{
83 call (*this); 183 call (*this);
84 184 io_manager::reg (*this);
85 iom.reg (this);
86} 185}
87 186
88void io_manager::reg (time_watcher *w) { reg (w, tw); } 187void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
89void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 188void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
90#endif 189#endif
91 190
92#if IOM_IO 191#if IOM_IO
93void io_manager::reg (io_watcher *w) { reg (w, iow); } 192void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
94void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 193void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
95#endif 194#endif
96 195
97#if IOM_CHECK 196#if IOM_CHECK
98void io_manager::reg (check_watcher *w) { reg (w, cw); } 197void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
99void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 198void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
100#endif 199#endif
101 200
102#if IOM_IDLE 201#if IOM_IDLE
103void io_manager::reg (idle_watcher *w) { reg (w, iw); } 202void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
104void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 203void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
105#endif 204#endif
106 205
107#if IOM_TIME 206#if IOM_SIG
108inline void set_now (void) 207static void
208sighandler (int signum)
109{ 209{
110 struct timeval tv; 210 sw [signum - 1]->pending = true;
111 211
112 gettimeofday (&tv, 0); 212 // we use a pipe for signal notifications, as most current
113 213 // OSes (Linux...) do not implement pselect correctly. ugh.
114 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 214 char ch = signum; // actual content not used
115#endif 215 write (sigpipe[1], &ch, 1);
116} 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
117 269
118void io_manager::loop () 270void io_manager::loop ()
119{ 271{
272 init::required ();
273
120#if IOM_TIME 274#if IOM_TIME
121 set_now (); 275 set_now ();
122#endif 276#endif
123 277
124 for (;;) 278 for (;;)
125 { 279 {
126 struct timeval *to = 0;
127 struct timeval tval;
128 280
129#if IOM_IDLE 281#if IOM_TIME
130 if (iw.size ()) 282 // call pending time watchers
131 { 283 {
132 tval.tv_sec = 0; 284 bool activity;
133 tval.tv_usec = 0; 285
134 to = &tval;
135 } 286 do
136 else
137#endif
138 {
139#if IOM_TIME
140 time_watcher *next;
141
142 for (;;)
143 { 287 {
144 next = tw[0]; // the first time-watcher must exist at ALL times 288 activity = false;
145 289
146 for (int i = tw.size (); i--; ) 290 for (int i = tw.size (); i--; )
147 if (!tw[i]) 291 if (!tw[i])
148 tw.erase_unordered (i); 292 tw.erase_unordered (i);
149 else if (tw[i]->at < next->at) 293 else if (tw[i]->at <= NOW)
150 next = tw[i];
151
152 if (next->at > NOW)
153 { 294 {
154 if (next != tw[0]) 295 time_watcher &w = *tw[i];
155 { 296
156 double diff = next->at - NOW;
157 tval.tv_sec = (int)diff;
158 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000);
159 to = &tval;
160 }
161 break; 297 unreg (w);
298 w.call (w);
299
300 activity = true;
162 } 301 }
163 else
164 {
165 unreg (next);
166 next->call (*next);
167 }
168 } 302 }
169#endif 303 while (activity);
170 } 304 }
305#endif
171 306
172#if IOM_CHECK 307#if IOM_CHECK
308 // call all check watchers
173 for (int i = cw.size (); i--; ) 309 for (int i = cw.size (); i--; )
174 if (!cw[i]) 310 if (!cw[i])
175 cw.erase_unordered (i); 311 cw.erase_unordered (i);
176 else 312 else
177 cw[i]->call (*cw[i]); 313 cw[i]->call (*cw[i]);
178#endif 314#endif
179 315
316 struct TIMEVAL *to = 0;
317 struct TIMEVAL tval;
318
180#if IOM_IO 319#if IOM_IDLE
320 if (iw.size ())
321 {
322 tval.tv_sec = 0;
323 tval.TV_FRAC = 0;
324 to = &tval;
325 }
326 else
327#endif
328 {
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
181 fd_set rfd, wfd, efd; 348 fd_set rfd, wfd;
182 349
183 FD_ZERO (&rfd); 350 FD_ZERO (&rfd);
184 FD_ZERO (&wfd); 351 FD_ZERO (&wfd);
185 352
186 int fds = 0; 353 int fds = 0;
187 354
355# if IOM_IO
188 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 (); )
189 if (*i) 357 if (*i)
190 { 358 {
191 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 359 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
192 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 360 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
193 361
194 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 362 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
195 } 363 }
364# endif
196 365
197 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 366 if (!to && !fds) //TODO: also check idle_watchers and check_watchers?
198 break; // no events 367 break; // no events
199 368
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
200 fds = select (fds, &rfd, &wfd, &efd, to); 379 fds = select (fds, &rfd, &wfd, NULL, to);
380# if IOM_SIG
381 sigprocmask (SIG_BLOCK, &sigs, NULL);
382# endif
383
201# if IOM_TIME 384# if IOM_TIME
202 set_now (); 385 set_now ();
203# endif 386# endif
204 387
205 if (fds > 0) 388 if (fds > 0)
206 for (int i = iow.size (); i--; ) 389 {
207 if (!iow[i]) 390# if IOM_SIG
208 iow.erase_unordered (i); 391 if (FD_ISSET (sigpipe[0], &rfd))
209 else
210 { 392 {
211 short revents = iow[i]->events; 393 char ch;
212 394
213 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 395 while (read (sigpipe[0], &ch, 1) > 0)
214 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 396 ;
215 397
216 if (revents) 398 for (vector<sig_vec *>::iterator svp = sw.end (); svp-- > sw.begin (); )
217 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 }
218 } 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 io_watcher &w = *iow[i];
420 short revents = w.events;
421
422 if (!FD_ISSET (w.fd, &rfd)) revents &= ~EVENT_READ;
423 if (!FD_ISSET (w.fd, &wfd)) revents &= ~EVENT_WRITE;
424
425 if (revents)
426 w.call (w, revents);
427 }
428#endif
429 }
219 else if (fds < 0 && errno != EINTR) 430 else if (fds < 0 && errno != EINTR)
220 { 431 {
221 perror ("Error while waiting for I/O or time event"); 432 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
222 abort (); 433 abort ();
223 } 434 }
224#if IOM_IDLE 435#if IOM_IDLE
225 else 436 else
226 for (int i = iw.size (); i--; ) 437 for (int i = iw.size (); i--; )
… …
240 break; 451 break;
241#endif 452#endif
242 } 453 }
243} 454}
244 455
245io_manager::io_manager ()
246{
247 iom_valid = true;
248
249#if IOM_TIME
250 set_now ();
251
252 tw0.start (TSTAMP_MAX);
253 printf ("abort, %f but inly on %f\n", NOW, tw0.at);
254#endif
255}
256
257io_manager::~io_manager ()
258{
259 iom_valid = false;
260}
261

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