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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.3 by pcg, Tue Nov 25 17:11:33 2003 UTC vs.
Revision 1.19 by root, Thu Sep 2 07:44:40 2004 UTC

1/* 1/*
2 iom.C -- generic I/O multiplexor 2 iom.C -- generic I/O multiplexor
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
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
30bool iom_valid; 108static bool iom_valid;
31io_manager iom;
32 109
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}
149
150template<class watcher>
151void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
152{
153 init::required ();
154
155 if (!w.active)
156 {
157#if IOM_CHECK
158 queue.activity = true;
159#endif
160 queue.push_back (&w);
161 w.active = queue.size ();
162 }
163}
164
165template<class watcher>
166void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
167{
168 if (!iom_valid)
169 return;
170
171 if (w.active)
172 {
173 queue [w.active - 1] = 0;
174 w.active = 0;
175 }
176}
177
178#if IOM_TIME
33void time_watcher::trigger () 179void time_watcher::trigger ()
34{ 180{
35 call (*this); 181 call (*this);
36 182 io_manager::reg (*this);
37 iom.reg (this);
38} 183}
39 184
40time_watcher::~time_watcher () 185void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
41{ 186void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
42 if (iom_valid) 187#endif
43 iom.unreg (this);
44 188
45 at = TSTAMP_CANCEL; 189#if IOM_IO
46} 190void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
191void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
192#endif
47 193
48io_watcher::~io_watcher () 194#if IOM_CHECK
49{ 195void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
50 if (iom_valid) 196void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
51 iom.unreg (this); 197#endif
52}
53 198
199#if IOM_IDLE
200void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
201void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
202#endif
203
204#if IOM_SIG
205static void
206sighandler (int signum)
207{
208 sw [signum - 1]->pending = true;
209
210 // we use a pipe for signal notifications, as most current
211 // OSes (Linux...) do not implement pselect correctly. ugh.
212 char ch = signum; // actual content not used
213 write (sigpipe[1], &ch, 1);
214}
215
54void io_manager::reg (io_watcher *w) 216void io_manager::reg (sig_watcher &w)
55{ 217{
56 if (find (iow.begin (), iow.end (), w) == iow.end ()) 218 assert (0 < w.signum);
219
220 sw.reserve (w.signum);
221
222 while (sw.size () < w.signum) // pathetic
57 iow.push_back (w); 223 sw.push_back (0);
58}
59 224
225 sig_vec *&sv = sw[w.signum - 1];
226
227 if (!sv)
228 {
229 sv = new sig_vec;
230
231 sigaddset (&sigs, w.signum);
232 sigprocmask (SIG_BLOCK, &sigs, NULL);
233
234 struct sigaction sa;
235 sa.sa_handler = sighandler;
236 sigfillset (&sa.sa_mask);
237 sa.sa_flags = SA_RESTART;
238
239 if (sigaction (w.signum, &sa, 0))
240 {
241 perror ("io_manager: error while installing signal handler, ignoring.");
242 abort ();
243 }
244
245 }
246
247 io_manager::reg (w, *sv);
248}
249
60void io_manager::unreg (io_watcher *w) 250void io_manager::unreg (sig_watcher &w)
61{ 251{
62 iow.erase (find (iow.begin (), iow.end (), w)); 252 if (!w.active)
63} 253 return;
64 254
65void io_manager::reg (time_watcher *w) 255 assert (0 < w.signum && w.signum <= sw.size ());
66{ 256
67 if (find (tw.begin (), tw.end (), w) == tw.end ()) 257 io_manager::unreg (w, *sw[w.signum - 1]);
68 tw.push_back (w);
69} 258}
70 259
71void io_manager::unreg (time_watcher *w) 260void sig_watcher::start (int signum)
72{ 261{
73 tw.erase (find (tw.begin (), tw.end (), w)); 262 stop ();
263 this->signum = signum;
264 io_manager::reg (*this);
74} 265}
75 266#endif
76inline void set_now (void)
77{
78 struct timeval tv;
79
80 gettimeofday (&tv, 0);
81
82 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
83}
84 267
85void io_manager::loop () 268void io_manager::loop ()
86{ 269{
270 init::required ();
271
272#if IOM_TIME
87 set_now (); 273 set_now ();
274#endif
88 275
89 for (;;) 276 for (;;)
90 { 277 {
91 time_watcher *w; 278 struct TIMEVAL *to = 0;
279 struct TIMEVAL tval;
92 280
93 for (;;) 281#if IOM_IDLE
94 { 282 if (iw.size ())
95 w = tw[0];
96
97 for (time_watcher **i = tw.begin (); i != tw.end (); ++i)
98 if ((*i)->at < w->at)
99 w = *i;
100
101 if (w->at > NOW)
102 break;
103
104 // call it
105 w->call (*w);
106
107 if (w->at < 0)
108 unreg (w);
109 } 283 {
284 tval.tv_sec = 0;
285 tval.TV_FRAC = 0;
286 to = &tval;
287 }
288 else
289#endif
290 {
291#if IOM_TIME
292 time_watcher *next;
110 293
111 struct timeval to; 294 for (;;)
112 double diff = w->at - NOW; 295 {
113 to.tv_sec = (int)diff; 296 next = tw[0]; // the first time-watcher must exist at ALL times
114 to.tv_usec = (int)((diff - to.tv_sec) * 1000000);
115 297
298 for (int i = tw.size (); i--; )
299 if (!tw[i])
300 tw.erase_unordered (i);
301 else if (tw[i]->at < next->at)
302 next = tw[i];
303
304 if (next->at > NOW)
305 {
306 if (next != tw[0])
307 {
308 double diff = next->at - NOW;
309 tval.tv_sec = (int)diff;
310 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
311 to = &tval;
312 }
313 break;
314 }
315 else
316 {
317 unreg (*next);
318 next->call (*next);
319 }
320 }
321#endif
322 }
323
324#if IOM_CHECK
325 tw.activity = false;
326
327 for (int i = cw.size (); i--; )
328 if (!cw[i])
329 cw.erase_unordered (i);
330 else
331 cw[i]->call (*cw[i]);
332
333 if (tw.activity)
334 {
335 tval.tv_sec = 0;
336 tval.TV_FRAC = 0;
337 to = &tval;
338 }
339#endif
340
341#if IOM_IO || IOM_SIG
116 fd_set rfd, wfd; 342 fd_set rfd, wfd;
117 343
118 FD_ZERO (&rfd); 344 FD_ZERO (&rfd);
119 FD_ZERO (&wfd); 345 FD_ZERO (&wfd);
120 346
121 int fds = 0; 347 int fds = 0;
122 348
123 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 349# if IOM_IO
350 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
351 if (*i)
124 { 352 {
125 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 353 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
126 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 354 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
127 355
128 if ((*w)->fd > fds) fds = (*w)->fd; 356 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
129 } 357 }
358# endif
130 359
360 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
361 break; // no events
362
363# if IOM_SIG
364 FD_SET (sigpipe[0], &rfd);
365 if (sigpipe[0] >= fds) fds = sigpipe[0] + 1;
366# endif
367
368# if IOM_SIG
369 // there is no race, as we use a pipe for signals, so select
370 // will return if a signal is caught.
371 sigprocmask (SIG_UNBLOCK, &sigs, NULL);
372# endif
131 fds = select (fds + 1, &rfd, &wfd, 0, &to); 373 fds = select (fds, &rfd, &wfd, NULL, to);
374# if IOM_SIG
375 sigprocmask (SIG_BLOCK, &sigs, NULL);
376# endif
132 377
378# if IOM_TIME
133 set_now (); 379 set_now ();
380# endif
134 381
135 if (fds > 0) 382 if (fds > 0)
136 for (io_watcher **w = iow.begin (); w < iow.end (); ++w) 383 {
384# if IOM_SIG
385 if (FD_ISSET (sigpipe[0], &rfd))
137 { 386 {
387 char ch;
388
389 while (read (sigpipe[0], &ch, 1) > 0)
390 ;
391
392 for (sig_vec **svp = sw.end (); svp-- > sw.begin (); )
393 if (*svp && (*svp)->pending)
394 {
395 sig_vec &sv = **svp;
396 for (int i = sv.size (); i--; )
397 if (!sv[i])
398 sv.erase_unordered (i);
399 else
400 sv[i]->call (*sv[i]);
401
402 sv.pending = false;
403 }
404 }
405# endif
406
407# if IOM_IO
408 for (int i = iow.size (); i--; )
409 if (!iow[i])
410 iow.erase_unordered (i);
411 else
412 {
138 short revents = (*w)->events; 413 short revents = iow[i]->events;
139 414
140 if (!FD_ISSET ((*w)->fd, &rfd)) revents &= ~EVENT_READ; 415 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
141 if (!FD_ISSET ((*w)->fd, &wfd)) revents &= ~EVENT_WRITE; 416 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
142 417
143 if (revents) 418 if (revents)
144 (*w)->call (**w, revents); 419 iow[i]->call (*iow[i], revents);
420 }
421#endif
145 } 422 }
146 } 423 else if (fds < 0 && errno != EINTR)
147} 424 {
425 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
426 abort ();
427 }
428#if IOM_IDLE
429 else
430 for (int i = iw.size (); i--; )
431 if (!iw[i])
432 iw.erase_unordered (i);
433 else
434 iw[i]->call (*iw[i]);
435#endif
148 436
149void io_manager::idle_cb (time_watcher &w) 437#elif IOM_TIME
150{ 438 if (!to)
151 w.at = NOW + 1000000000; 439 break;
152}
153 440
154io_manager::io_manager () 441 select (0, 0, 0, 0, &to);
155{
156 set_now (); 442 set_now ();
157 443#else
158 iom_valid = true; 444 break;
159 445#endif
160 idle = new time_watcher (this, &io_manager::idle_cb); 446 }
161 idle->start (0);
162} 447}
163 448
164io_manager::~io_manager ()
165{
166 iom_valid = false;
167}
168

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