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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.7 by pcg, Fri Dec 19 06:17:03 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; 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}
32 149
33template<class watcher> 150template<class watcher>
34void io_manager::reg (watcher *w, simplevec<watcher *> &queue) 151void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
35{ 152{
36 if (find (queue.begin (), queue.end (), w) == queue.end ()) 153 init::required ();
154
155 if (!w.active)
156 {
157#if IOM_CHECK
158 queue.activity = true;
159#endif
37 queue.push_back (w); 160 queue.push_back (&w);
161 w.active = queue.size ();
162 }
38} 163}
39 164
40template<class watcher> 165template<class watcher>
41void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) 166void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
42{ 167{
43 queue.erase (find (queue.begin (), queue.end (), w)); 168 if (!iom_valid)
169 return;
170
171 if (w.active)
172 {
173 queue [w.active - 1] = 0;
174 w.active = 0;
175 }
44} 176}
177
178#if IOM_TIME
179void time_watcher::trigger ()
180{
181 call (*this);
182 io_manager::reg (*this);
183}
184
185void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
186void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
187#endif
45 188
46#if IOM_IO 189#if IOM_IO
47io_watcher::~io_watcher () 190void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
48{ 191void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
49 if (iom_valid)
50 iom.unreg (this);
51}
52
53void io_manager::reg (io_watcher *w)
54{
55 reg (w, iow);
56}
57
58void io_manager::unreg (io_watcher *w)
59{
60 unreg (w, iow);
61}
62
63#endif
64
65#if IOM_TIME
66void time_watcher::trigger ()
67{
68 call (*this);
69
70 iom.reg (this);
71}
72
73time_watcher::~time_watcher ()
74{
75 if (iom_valid)
76 iom.unreg (this);
77
78 at = TSTAMP_CANCEL;
79}
80
81void io_manager::reg (time_watcher *w)
82{
83 reg (w, tw);
84}
85
86void io_manager::unreg (time_watcher *w)
87{
88 unreg (w, tw);
89}
90#endif 192#endif
91 193
92#if IOM_CHECK 194#if IOM_CHECK
93check_watcher::~check_watcher () 195void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
94{ 196void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
95 if (iom_valid)
96 iom.unreg (this);
97}
98
99void io_manager::reg (check_watcher *w)
100{
101 reg (w, cw);
102}
103
104void io_manager::unreg (check_watcher *w)
105{
106 unreg (w, cw);
107}
108#endif 197#endif
109 198
110#if IOM_IDLE 199#if IOM_IDLE
111idle_watcher::~idle_watcher () 200void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
112{ 201void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
113 if (iom_valid) 202#endif
114 iom.unreg (this);
115}
116 203
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
117void io_manager::reg (idle_watcher *w) 216void io_manager::reg (sig_watcher &w)
118{ 217{
119 reg (w, iw); 218 assert (0 < w.signum);
120}
121 219
220 sw.reserve (w.signum);
221
222 while (sw.size () < w.signum) // pathetic
223 sw.push_back (0);
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
122void io_manager::unreg (idle_watcher *w) 250void io_manager::unreg (sig_watcher &w)
123{ 251{
124 unreg (w, iw); 252 if (!w.active)
125} 253 return;
126#endif
127 254
128#if IOM_TIME 255 assert (0 < w.signum && w.signum <= sw.size ());
129inline void set_now (void) 256
130{ 257 io_manager::unreg (w, *sw[w.signum - 1]);
131 struct timeval tv;
132
133 gettimeofday (&tv, 0);
134
135 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000;
136#endif
137} 258}
259
260void sig_watcher::start (int signum)
261{
262 stop ();
263 this->signum = signum;
264 io_manager::reg (*this);
265}
266#endif
138 267
139void io_manager::loop () 268void io_manager::loop ()
140{ 269{
270 init::required ();
271
141#if IOM_TIME 272#if IOM_TIME
142 set_now (); 273 set_now ();
143#endif 274#endif
144 275
145 for (;;) 276 for (;;)
146 { 277 {
147 struct timeval *to = 0; 278 struct TIMEVAL *to = 0;
148 struct timeval tval; 279 struct TIMEVAL tval;
149 280
150#if IOM_IDLE 281#if IOM_IDLE
151 if (iw.size ()) 282 if (iw.size ())
152 { 283 {
153 tval.tv_sec = 0; 284 tval.tv_sec = 0;
154 tval.tv_usec = 0; 285 tval.TV_FRAC = 0;
155 to = &tval; 286 to = &tval;
156 } 287 }
157 else 288 else
158#endif 289#endif
159 { 290 {
160#if IOM_TIME 291#if IOM_TIME
161 time_watcher *w; 292 time_watcher *next;
162 293
163 for (;tw.size ();) 294 for (;;)
164 { 295 {
296 next = tw[0]; // the first time-watcher must exist at ALL times
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)
165 w = tw[0]; 302 next = tw[i];
166 303
167 for (time_watcher **i = tw.begin (); i < tw.end (); ++i)
168 if ((*i)->at < w->at)
169 w = *i;
170
171 if (w->at > NOW) 304 if (next->at > NOW)
172 { 305 {
306 if (next != tw[0])
307 {
173 double diff = w->at - NOW; 308 double diff = next->at - NOW;
174 tval.tv_sec = (int)diff; 309 tval.tv_sec = (int)diff;
175 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 310 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
176 to = &tval; 311 to = &tval;
312 }
177 break; 313 break;
178 } 314 }
179 else if (w->at >= 0)
180 w->call (*w);
181 else 315 else
316 {
182 unreg (w); 317 unreg (*next);
318 next->call (*next);
319 }
183 } 320 }
184#endif 321#endif
185 } 322 }
186 323
187#if IOM_CHECK 324#if IOM_CHECK
325 tw.activity = false;
326
188 for (int i = 0; i < cw.size (); ++i) 327 for (int i = cw.size (); i--; )
328 if (!cw[i])
329 cw.erase_unordered (i);
330 else
189 cw[i]->call (*cw[i]); 331 cw[i]->call (*cw[i]);
190#endif
191 332
192#if IOM_IO 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
193 fd_set rfd, wfd; 342 fd_set rfd, wfd;
194 343
195 FD_ZERO (&rfd); 344 FD_ZERO (&rfd);
196 FD_ZERO (&wfd); 345 FD_ZERO (&wfd);
197 346
198 int fds = 0; 347 int fds = 0;
199 348
200 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)
201 { 352 {
202 if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); 353 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
203 if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); 354 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
204 355
205 if ((*w)->fd >= fds) fds = (*w)->fd + 1; 356 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
206 } 357 }
358# endif
207 359
208 if (!to && !fds) 360 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
209 break; // no events 361 break; // no events
210 362
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
211 fds = select (fds, &rfd, &wfd, 0, to); 373 fds = select (fds, &rfd, &wfd, NULL, to);
374# if IOM_SIG
375 sigprocmask (SIG_BLOCK, &sigs, NULL);
376# endif
377
212# if IOM_TIME 378# if IOM_TIME
213 set_now (); 379 set_now ();
214# endif 380# endif
215 381
216 if (fds > 0) 382 if (fds > 0)
217 for (int i = 0; i < iow.size (); ++i) 383 {
384# if IOM_SIG
385 if (FD_ISSET (sigpipe[0], &rfd))
218 { 386 {
219 io_watcher *w = iow[i]; 387 char ch;
220 388
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 {
221 short revents = w->events; 413 short revents = iow[i]->events;
222 414
223 if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ; 415 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
224 if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE; 416 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
225 417
226 if (revents) 418 if (revents)
227 w->call (*w, revents); 419 iow[i]->call (*iow[i], revents);
420 }
421#endif
228 } 422 }
423 else if (fds < 0 && errno != EINTR)
424 {
425 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
426 abort ();
427 }
229#if IOM_IDLE 428#if IOM_IDLE
230 else if (iw.size ()) 429 else
231 for (int i = 0; i < iw.size (); ++i) 430 for (int i = iw.size (); i--; )
431 if (!iw[i])
432 iw.erase_unordered (i);
433 else
232 iw[i]->call (*iw[i]); 434 iw[i]->call (*iw[i]);
233#endif 435#endif
234 436
235#elif IOM_TIME 437#elif IOM_TIME
236 if (!to) 438 if (!to)
237 break; 439 break;
… …
242 break; 444 break;
243#endif 445#endif
244 } 446 }
245} 447}
246 448
247io_manager::io_manager ()
248{
249#if IOM_TIME
250 set_now ();
251#endif
252
253 iom_valid = true;
254}
255
256io_manager::~io_manager ()
257{
258 iom_valid = false;
259}
260

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