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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 1.19 by root, Thu Sep 2 07:44:40 2004 UTC

… …
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 <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
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
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
108static bool iom_valid;
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
43 } 134 }
44 135
45 tw0() 136 static void required ();
46 : time_watcher (this, &tw0::cb) 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 ();
47 { } 147 }
48} tw0; 148}
49
50tstamp NOW;
51static bool iom_valid;
52io_manager iom;
53 149
54template<class watcher> 150template<class watcher>
55void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 151void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
56{ 152{
57 if (!iom_valid) 153 init::required ();
58 abort ();
59 154
60 if (!w->active) 155 if (!w.active)
61 { 156 {
157#if IOM_CHECK
158 queue.activity = true;
159#endif
62 queue.push_back (w); 160 queue.push_back (&w);
63 w->active = queue.size (); 161 w.active = queue.size ();
64 } 162 }
65} 163}
66 164
67template<class watcher> 165template<class watcher>
68void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 166void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
69{ 167{
70 if (!iom_valid) 168 if (!iom_valid)
71 return; 169 return;
72 170
73 if (w->active) 171 if (w.active)
74 { 172 {
75 queue [w->active - 1] = 0; 173 queue [w.active - 1] = 0;
76 w->active = 0; 174 w.active = 0;
77 } 175 }
78} 176}
79 177
80#if IOM_TIME 178#if IOM_TIME
81void time_watcher::trigger () 179void time_watcher::trigger ()
82{ 180{
83 call (*this); 181 call (*this);
84 182 io_manager::reg (*this);
85 iom.reg (this);
86} 183}
87 184
88void io_manager::reg (time_watcher *w) { reg (w, tw); } 185void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
89void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 186void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
90#endif 187#endif
91 188
92#if IOM_IO 189#if IOM_IO
93void io_manager::reg (io_watcher *w) { reg (w, iow); } 190void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
94void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 191void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
95#endif 192#endif
96 193
97#if IOM_CHECK 194#if IOM_CHECK
98void io_manager::reg (check_watcher *w) { reg (w, cw); } 195void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
99void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 196void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
100#endif 197#endif
101 198
102#if IOM_IDLE 199#if IOM_IDLE
103void io_manager::reg (idle_watcher *w) { reg (w, iw); } 200void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
104void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 201void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
105#endif 202#endif
106 203
107#if IOM_TIME 204#if IOM_SIG
108inline void set_now (void) 205static void
206sighandler (int signum)
109{ 207{
110 struct timeval tv; 208 sw [signum - 1]->pending = true;
111 209
112 gettimeofday (&tv, 0); 210 // we use a pipe for signal notifications, as most current
113 211 // OSes (Linux...) do not implement pselect correctly. ugh.
114 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 212 char ch = signum; // actual content not used
115#endif 213 write (sigpipe[1], &ch, 1);
116} 214}
215
216void io_manager::reg (sig_watcher &w)
217{
218 assert (0 < w.signum);
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
250void io_manager::unreg (sig_watcher &w)
251{
252 if (!w.active)
253 return;
254
255 assert (0 < w.signum && w.signum <= sw.size ());
256
257 io_manager::unreg (w, *sw[w.signum - 1]);
258}
259
260void sig_watcher::start (int signum)
261{
262 stop ();
263 this->signum = signum;
264 io_manager::reg (*this);
265}
266#endif
117 267
118void io_manager::loop () 268void io_manager::loop ()
119{ 269{
270 init::required ();
271
120#if IOM_TIME 272#if IOM_TIME
121 set_now (); 273 set_now ();
122#endif 274#endif
123 275
124 for (;;) 276 for (;;)
125 { 277 {
126 struct timeval *to = 0; 278 struct TIMEVAL *to = 0;
127 struct timeval tval; 279 struct TIMEVAL tval;
128 280
129#if IOM_IDLE 281#if IOM_IDLE
130 if (iw.size ()) 282 if (iw.size ())
131 { 283 {
132 tval.tv_sec = 0; 284 tval.tv_sec = 0;
133 tval.tv_usec = 0; 285 tval.TV_FRAC = 0;
134 to = &tval; 286 to = &tval;
135 } 287 }
136 else 288 else
137#endif 289#endif
138 { 290 {
… …
153 { 305 {
154 if (next != tw[0]) 306 if (next != tw[0])
155 { 307 {
156 double diff = next->at - NOW; 308 double diff = next->at - NOW;
157 tval.tv_sec = (int)diff; 309 tval.tv_sec = (int)diff;
158 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 310 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
159 to = &tval; 311 to = &tval;
160 } 312 }
161 break; 313 break;
162 } 314 }
163 else 315 else
164 { 316 {
165 unreg (next); 317 unreg (*next);
166 next->call (*next); 318 next->call (*next);
167 } 319 }
168 } 320 }
169#endif 321#endif
170 } 322 }
171 323
172#if IOM_CHECK 324#if IOM_CHECK
325 tw.activity = false;
326
173 for (int i = cw.size (); i--; ) 327 for (int i = cw.size (); i--; )
174 if (!cw[i]) 328 if (!cw[i])
175 cw.erase_unordered (i); 329 cw.erase_unordered (i);
176 else 330 else
177 cw[i]->call (*cw[i]); 331 cw[i]->call (*cw[i]);
178#endif
179 332
180#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
181 fd_set rfd, wfd, efd; 342 fd_set rfd, wfd;
182 343
183 FD_ZERO (&rfd); 344 FD_ZERO (&rfd);
184 FD_ZERO (&wfd); 345 FD_ZERO (&wfd);
185 346
186 int fds = 0; 347 int fds = 0;
187 348
349# if IOM_IO
188 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); ) 350 for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); )
189 if (*i) 351 if (*i)
190 { 352 {
191 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 353 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
192 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 354 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
193 355
194 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 356 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
195 } 357 }
358# endif
196 359
197 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 360 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
198 break; // no events 361 break; // no events
199 362
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
200 fds = select (fds, &rfd, &wfd, &efd, to); 373 fds = select (fds, &rfd, &wfd, NULL, to);
374# if IOM_SIG
375 sigprocmask (SIG_BLOCK, &sigs, NULL);
376# endif
377
201# if IOM_TIME 378# if IOM_TIME
202 set_now (); 379 set_now ();
203# endif 380# endif
204 381
205 if (fds > 0) 382 if (fds > 0)
206 for (int i = iow.size (); i--; ) 383 {
207 if (!iow[i]) 384# if IOM_SIG
208 iow.erase_unordered (i); 385 if (FD_ISSET (sigpipe[0], &rfd))
209 else
210 { 386 {
211 short revents = iow[i]->events; 387 char ch;
212 388
213 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 389 while (read (sigpipe[0], &ch, 1) > 0)
214 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 390 ;
215 391
216 if (revents) 392 for (sig_vec **svp = sw.end (); svp-- > sw.begin (); )
217 iow[i]->call (*iow[i], revents); 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 }
218 } 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 {
413 short revents = iow[i]->events;
414
415 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ;
416 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE;
417
418 if (revents)
419 iow[i]->call (*iow[i], revents);
420 }
421#endif
422 }
219 else if (fds < 0 && errno != EINTR) 423 else if (fds < 0 && errno != EINTR)
220 { 424 {
221 perror ("Error while waiting for I/O or time event"); 425 perror ("io_manager: fatal error while waiting for I/O or time event, aborting.");
222 abort (); 426 abort ();
223 } 427 }
224#if IOM_IDLE 428#if IOM_IDLE
225 else 429 else
226 for (int i = iw.size (); i--; ) 430 for (int i = iw.size (); i--; )
… …
240 break; 444 break;
241#endif 445#endif
242 } 446 }
243} 447}
244 448
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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