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Comparing rxvt-unicode/src/iom.C (file contents):
Revision 1.11 by pcg, Mon Jan 19 17:26:43 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
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)
44static struct tw0 : time_watcher { 81static struct tw0 : time_watcher
45 void cb (time_watcher &w)
46 { 82 {
83 void cb (time_watcher &w)
84 {
47 // should never get called 85 // should never get called
48 // reached end-of-time, or tstamp has a bogus definition, 86 // reached end-of-time, or tstamp has a bogus definition,
49 // or compiler initilization order broken, or somethine else :) 87 // or compiler initialisation order broken, or something else :)
50 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
51 } 134 }
52 135
53 tw0() 136 static void required ();
54 : 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 ();
55 { } 147 }
56} tw0; 148}
57
58tstamp NOW;
59static bool iom_valid;
60io_manager iom;
61 149
62template<class watcher> 150template<class watcher>
63void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 151void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
64{ 152{
65 if (!iom_valid) 153 init::required ();
66 abort ();
67 154
68 if (!w->active) 155 if (!w.active)
69 { 156 {
157#if IOM_CHECK
158 queue.activity = true;
159#endif
70 queue.push_back (w); 160 queue.push_back (&w);
71 w->active = queue.size (); 161 w.active = queue.size ();
72 } 162 }
73} 163}
74 164
75template<class watcher> 165template<class watcher>
76void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 166void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
77{ 167{
78 if (!iom_valid) 168 if (!iom_valid)
79 return; 169 return;
80 170
81 if (w->active) 171 if (w.active)
82 { 172 {
83 queue [w->active - 1] = 0; 173 queue [w.active - 1] = 0;
84 w->active = 0; 174 w.active = 0;
85 } 175 }
86} 176}
87 177
88#if IOM_TIME 178#if IOM_TIME
89void time_watcher::trigger () 179void time_watcher::trigger ()
90{ 180{
91 call (*this); 181 call (*this);
92 182 io_manager::reg (*this);
93 iom.reg (this);
94} 183}
95 184
96void io_manager::reg (time_watcher *w) { reg (w, tw); } 185void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
97void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 186void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
98#endif 187#endif
99 188
100#if IOM_IO 189#if IOM_IO
101void io_manager::reg (io_watcher *w) { reg (w, iow); } 190void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
102void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 191void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
103#endif 192#endif
104 193
105#if IOM_CHECK 194#if IOM_CHECK
106void io_manager::reg (check_watcher *w) { reg (w, cw); } 195void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
107void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 196void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
108#endif 197#endif
109 198
110#if IOM_IDLE 199#if IOM_IDLE
111void io_manager::reg (idle_watcher *w) { reg (w, iw); } 200void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
112void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 201void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
113#endif 202#endif
114 203
115#if IOM_TIME 204#if IOM_SIG
116inline void set_now (void) 205static void
206sighandler (int signum)
117{ 207{
118 struct timeval tv; 208 sw [signum - 1]->pending = true;
119 209
120 gettimeofday (&tv, 0); 210 // we use a pipe for signal notifications, as most current
121 211 // OSes (Linux...) do not implement pselect correctly. ugh.
122 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 212 char ch = signum; // actual content not used
123#endif 213 write (sigpipe[1], &ch, 1);
124} 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
125 267
126void io_manager::loop () 268void io_manager::loop ()
127{ 269{
270 init::required ();
271
128#if IOM_TIME 272#if IOM_TIME
129 set_now (); 273 set_now ();
130#endif 274#endif
131 275
132 for (;;) 276 for (;;)
133 { 277 {
134 struct timeval *to = 0; 278 struct TIMEVAL *to = 0;
135 struct timeval tval; 279 struct TIMEVAL tval;
136 280
137#if IOM_IDLE 281#if IOM_IDLE
138 if (iw.size ()) 282 if (iw.size ())
139 { 283 {
140 tval.tv_sec = 0; 284 tval.tv_sec = 0;
141 tval.tv_usec = 0; 285 tval.TV_FRAC = 0;
142 to = &tval; 286 to = &tval;
143 } 287 }
144 else 288 else
145#endif 289#endif
146 { 290 {
… …
161 { 305 {
162 if (next != tw[0]) 306 if (next != tw[0])
163 { 307 {
164 double diff = next->at - NOW; 308 double diff = next->at - NOW;
165 tval.tv_sec = (int)diff; 309 tval.tv_sec = (int)diff;
166 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 310 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
167 to = &tval; 311 to = &tval;
168 } 312 }
169 break; 313 break;
170 } 314 }
171 else 315 else
172 { 316 {
173 unreg (next); 317 unreg (*next);
174 next->call (*next); 318 next->call (*next);
175 } 319 }
176 } 320 }
177#endif 321#endif
178 } 322 }
179 323
180#if IOM_CHECK 324#if IOM_CHECK
325 tw.activity = false;
326
181 for (int i = cw.size (); i--; ) 327 for (int i = cw.size (); i--; )
182 if (!cw[i]) 328 if (!cw[i])
183 cw.erase_unordered (i); 329 cw.erase_unordered (i);
184 else 330 else
185 cw[i]->call (*cw[i]); 331 cw[i]->call (*cw[i]);
186#endif
187 332
188#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
189 fd_set rfd, wfd, efd; 342 fd_set rfd, wfd;
190 343
191 FD_ZERO (&rfd); 344 FD_ZERO (&rfd);
192 FD_ZERO (&wfd); 345 FD_ZERO (&wfd);
193 346
194 int fds = 0; 347 int fds = 0;
195 348
349# if IOM_IO
196 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 (); )
197 if (*i) 351 if (*i)
198 { 352 {
199 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 353 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
200 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 354 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
201 355
202 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 356 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
203 } 357 }
358# endif
204 359
205 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 360 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
206 break; // no events 361 break; // no events
207 362
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
208 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
209# if IOM_TIME 378# if IOM_TIME
210 set_now (); 379 set_now ();
211# endif 380# endif
212 381
213 if (fds > 0) 382 if (fds > 0)
214 for (int i = iow.size (); i--; ) 383 {
215 if (!iow[i]) 384# if IOM_SIG
216 iow.erase_unordered (i); 385 if (FD_ISSET (sigpipe[0], &rfd))
217 else
218 { 386 {
219 short revents = iow[i]->events; 387 char ch;
220 388
221 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 389 while (read (sigpipe[0], &ch, 1) > 0)
222 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 390 ;
223 391
224 if (revents) 392 for (sig_vec **svp = sw.end (); svp-- > sw.begin (); )
225 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 }
226 } 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 }
227 else if (fds < 0 && errno != EINTR) 423 else if (fds < 0 && errno != EINTR)
228 { 424 {
229 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.");
230 abort (); 426 abort ();
231 } 427 }
232#if IOM_IDLE 428#if IOM_IDLE
233 else 429 else
234 for (int i = iw.size (); i--; ) 430 for (int i = iw.size (); i--; )
… …
248 break; 444 break;
249#endif 445#endif
250 } 446 }
251} 447}
252 448
253io_manager::io_manager ()
254{
255 iom_valid = true;
256
257#if IOM_TIME
258 set_now ();
259
260 tw0.start (TSTAMP_MAX);
261#endif
262}
263
264io_manager::~io_manager ()
265{
266 iom_valid = false;
267}
268

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