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Comparing gvpe/src/iom.C (file contents):
Revision 1.13 by pcg, Sat Jan 17 01:18:36 2004 UTC vs.
Revision 1.21 by pcg, Thu Sep 2 07:50:43 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)
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;
95
32tstamp 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
33static bool iom_valid; 108static bool iom_valid;
34io_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}
35 149
36template<class watcher> 150template<class watcher>
37void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) 151void io_manager::reg (watcher &w, io_manager_vec<watcher> &queue)
38{ 152{
39 if (!iom_valid) 153 init::required ();
40 abort ();
41 154
42 if (!w->active) 155 if (!w.active)
43 { 156 {
157#if IOM_CHECK
158 queue.activity = true;
159#endif
44 queue.push_back (w); 160 queue.push_back (&w);
45 w->active = queue.size (); 161 w.active = queue.size ();
46 } 162 }
47} 163}
48 164
49template<class watcher> 165template<class watcher>
50void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) 166void io_manager::unreg (watcher &w, io_manager_vec<watcher> &queue)
51{ 167{
52 if (!iom_valid) 168 if (!iom_valid)
53 return; 169 return;
54 170
55 if (w->active) 171 if (w.active)
56 { 172 {
57 queue [w->active - 1] = 0; 173 queue [w.active - 1] = 0;
58 w->active = 0; 174 w.active = 0;
59 } 175 }
60} 176}
61 177
62#if IOM_TIME 178#if IOM_TIME
63void time_watcher::trigger () 179void time_watcher::trigger ()
64{ 180{
65 call (*this); 181 call (*this);
66 182 io_manager::reg (*this);
67 iom.reg (this);
68} 183}
69 184
70void io_manager::reg (time_watcher *w) { reg (w, tw); } 185void io_manager::reg (time_watcher &w) { io_manager::reg (w, tw); }
71void io_manager::unreg (time_watcher *w) { unreg (w, tw); } 186void io_manager::unreg (time_watcher &w) { io_manager::unreg (w, tw); }
72#endif 187#endif
73 188
74#if IOM_IO 189#if IOM_IO
75void io_manager::reg (io_watcher *w) { reg (w, iow); } 190void io_manager::reg (io_watcher &w) { io_manager::reg (w, iow); }
76void io_manager::unreg (io_watcher *w) { unreg (w, iow); } 191void io_manager::unreg (io_watcher &w) { io_manager::unreg (w, iow); }
77#endif 192#endif
78 193
79#if IOM_CHECK 194#if IOM_CHECK
80void io_manager::reg (check_watcher *w) { reg (w, cw); } 195void io_manager::reg (check_watcher &w) { io_manager::reg (w, cw); }
81void io_manager::unreg (check_watcher *w) { unreg (w, cw); } 196void io_manager::unreg (check_watcher &w) { io_manager::unreg (w, cw); }
82#endif 197#endif
83 198
84#if IOM_IDLE 199#if IOM_IDLE
85void io_manager::reg (idle_watcher *w) { reg (w, iw); } 200void io_manager::reg (idle_watcher &w) { io_manager::reg (w, iw); }
86void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } 201void io_manager::unreg (idle_watcher &w) { io_manager::unreg (w, iw); }
87#endif 202#endif
88 203
89#if IOM_TIME 204#if IOM_SIG
90inline void set_now (void) 205static void
206sighandler (int signum)
91{ 207{
92 struct timeval tv; 208 sw [signum - 1]->pending = true;
93 209
94 gettimeofday (&tv, 0); 210 // we use a pipe for signal notifications, as most current
95 211 // OSes (Linux...) do not implement pselect correctly. ugh.
96 NOW = (tstamp)tv.tv_sec + (tstamp)tv.tv_usec / 1000000; 212 char ch = signum; // actual content not used
97#endif 213 write (sigpipe[1], &ch, 1);
98} 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
99 267
100void io_manager::loop () 268void io_manager::loop ()
101{ 269{
270 init::required ();
271
102#if IOM_TIME 272#if IOM_TIME
103 set_now (); 273 set_now ();
104#endif 274#endif
105 275
106 for (;;) 276 for (;;)
107 { 277 {
108 struct timeval *to = 0; 278 struct TIMEVAL *to = 0;
109 struct timeval tval; 279 struct TIMEVAL tval;
110 280
111#if IOM_IDLE 281#if IOM_IDLE
112 if (iw.size ()) 282 if (iw.size ())
113 { 283 {
114 tval.tv_sec = 0; 284 tval.tv_sec = 0;
115 tval.tv_usec = 0; 285 tval.TV_FRAC = 0;
116 to = &tval; 286 to = &tval;
117 } 287 }
118 else 288 else
119#endif 289#endif
120 { 290 {
… …
135 { 305 {
136 if (next != tw[0]) 306 if (next != tw[0])
137 { 307 {
138 double diff = next->at - NOW; 308 double diff = next->at - NOW;
139 tval.tv_sec = (int)diff; 309 tval.tv_sec = (int)diff;
140 tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); 310 tval.TV_FRAC = (int) ((diff - tval.tv_sec) * TV_MULT);
141 to = &tval; 311 to = &tval;
142 } 312 }
143 break; 313 break;
144 } 314 }
145 else 315 else
146 { 316 {
147 unreg (next); 317 unreg (*next);
148 next->call (*next); 318 next->call (*next);
149 } 319 }
150 } 320 }
151#endif 321#endif
152 } 322 }
153 323
154#if IOM_CHECK 324#if IOM_CHECK
325 tw.activity = false;
326
155 for (int i = cw.size (); i--; ) 327 for (int i = cw.size (); i--; )
156 if (!cw[i]) 328 if (!cw[i])
157 cw.erase_unordered (i); 329 cw.erase_unordered (i);
158 else 330 else
159 cw[i]->call (*cw[i]); 331 cw[i]->call (*cw[i]);
160#endif
161 332
162#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
163 fd_set rfd, wfd, efd; 342 fd_set rfd, wfd;
164 343
165 FD_ZERO (&rfd); 344 FD_ZERO (&rfd);
166 FD_ZERO (&wfd); 345 FD_ZERO (&wfd);
167 346
168 int fds = 0; 347 int fds = 0;
169 348
349# if IOM_IO
170 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 (); )
171 if (*i) 351 if (*i)
172 { 352 {
173 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); 353 if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd);
174 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); 354 if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd);
175 355
176 if ((*i)->fd >= fds) fds = (*i)->fd + 1; 356 if ((*i)->fd >= fds) fds = (*i)->fd + 1;
177 } 357 }
358# endif
178 359
179 if (!to && !fds) //TODO: also check idle_watchers and check_watchers 360 if (!to && !fds) //TODO: also check idle_watchers and check_watchers
180 break; // no events 361 break; // no events
181 362
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
182 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
183# if IOM_TIME 378# if IOM_TIME
184 set_now (); 379 set_now ();
185# endif 380# endif
186 381
187 if (fds > 0) 382 if (fds > 0)
188 for (int i = iow.size (); i--; ) 383 {
189 if (!iow[i]) 384# if IOM_SIG
190 iow.erase_unordered (i); 385 if (FD_ISSET (sigpipe[0], &rfd))
191 else
192 { 386 {
193 short revents = iow[i]->events; 387 char ch;
194 388
195 if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; 389 while (read (sigpipe[0], &ch, 1) > 0)
196 if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; 390 ;
197 391
198 if (revents) 392 for (sig_vec **svp = sw.end (); svp-- > sw.begin (); )
199 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 }
200 } 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 }
201 else if (fds < 0 && errno != EINTR) 423 else if (fds < 0 && errno != EINTR)
202 { 424 {
203 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.");
204 abort (); 426 abort ();
205 } 427 }
206#if IOM_IDLE 428#if IOM_IDLE
207 else 429 else
208 for (int i = iw.size (); i--; ) 430 for (int i = iw.size (); i--; )
… …
222 break; 444 break;
223#endif 445#endif
224 } 446 }
225} 447}
226 448
227// this is a dummy time watcher to ensure that the first
228// time watcher is _always_ valid, this gets rid of a lot
229// of null-pointer-checks
230static struct tw0 : time_watcher {
231 void cb (time_watcher &w)
232 {
233 // should never get called
234 // reached end-of-time, or tstamp has a bogus definition :)
235 abort ();
236 }
237
238 tw0()
239 : time_watcher (this, &tw0::cb)
240 { }
241} tw0;
242
243io_manager::io_manager ()
244{
245 iom_valid = true;
246
247#if IOM_TIME
248 set_now ();
249
250 tw0.start (TSTAMP_MAX);
251#endif
252}
253
254io_manager::~io_manager ()
255{
256 iom_valid = false;
257}
258

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