1/*
2 * Copyright (c)1996-2002 by Hartmut Brandt
3 * All rights reserved.
4 *
5 * Author: Hartmut Brandt
6 *
7 * Redistribution of this software and documentation and use in source and
8 * binary forms, with or without modification, are permitted provided that

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96
97# ifdef BROKEN_SELECT_PROTO
98# define SELECT_CAST(P) (int *)P
99# else
100# define SELECT_CAST(P) P
101# endif
102
103
104typedef signed long long tval_t;
105
106static inline tval_t GETMSECS(void);
107
108static inline tval_t
109GETMSECS(void) {
110 struct timeval tval;
111
112 (void)gettimeofday(&tval, NULL);
113 return (tval_t)tval.tv_sec*1000+tval.tv_usec/1000;
114}
115
116/*
117 * Simple fatal exit.
118 */
119static void
120_panic(const char *fmt, ...)
121{

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165 struct pollfd *pfd; /* pointer to corresponding poll() structure */
166# endif
167} PollReg_t;
168
169/*
170 * Now for timers
171 */
172typedef struct {
173 u_int msecs; /* millisecond value of the timer */
174 int repeat; /* one shot or repeat? */
175 void *arg; /* client arg */
176 timer_f func; /* handler, 0 means disfunct */
177 tval_t when; /* next time to trigger in msecs! */
178} PollTim_t;
179
180/* how many records should our table grow at once? */
181# define POLL_REG_GROW 100
182
183# ifdef USE_POLL
184static struct pollfd * pfd; /* fd list for poll() */
185# endif

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291
292 regs_used++;
293 rebuild = 1;
294 }
295
296 poll_unblocksig();
297
298 if(rpoll_trace)
299 fprintf(stderr, "poll_register(%d, %#lx, %#lx, %#x)->%d",
300 fd, (u_long)func, (u_long)arg, mask, p - regs);
301 return p - regs;
302}
303
304/*
305 * remove registration
306 */
307void
308poll_unregister(int handle)

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368 FD_SET(p->fd, &xset);
369 }
370# endif
371}
372
373int
374poll_start_timer(u_int msecs, int repeat, timer_f func, void *arg)
375{
376 PollTim_t *p;
377
378 /* find unused entry */
379 for(p = tims; p < &tims[tims_alloc]; p++)
380 if(p->func == NULL)
381 break;
382
383 if(p == &tims[tims_alloc]) {
384 if(tims_alloc == tims_used) {
385 size_t newsize = tims_alloc + POLL_REG_GROW;
386 tims = _xrealloc(tims, sizeof(tims[0]) * newsize);
387 for(p = &tims[tims_alloc]; p < &tims[newsize]; p++)
388 p->func = NULL;
389 p = &tims[tims_alloc];
390 tims_alloc = newsize;
391 }
392 }
393
394 /* create entry */
395 p->msecs = msecs;
396 p->repeat = repeat;
397 p->arg = arg;
398 p->func = func;
399 p->when = GETMSECS() + msecs;
400
401 tims_used++;
402
403 resort = 1;
404
405 if(rpoll_trace)
406 fprintf(stderr, "poll_start_timer(%u, %d, %#lx, %#lx)->%u",
407 msecs, repeat, (u_long)func, (u_long)arg, p - tims);
408
409 return p - tims;
410}
411
412/*
413 * Here we have to look into the sorted table, whether any entry there points
414 * into the registration table for the deleted entry. This is needed,
415 * because a unregistration can occure while we are scanning through the

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492 * to be called. So we clear pfd in unregister and check here.
493 */
494void
495poll_dispatch(int wait)
496{
497 u_int i, idx;
498 int ret;
499 tval_t now;
500 int tout;
501 static u_int last_index;
502
503# ifdef USE_SELECT
504 fd_set nrset, nwset, nxset;
505 struct timeval tv;
506# endif
507
508 in_dispatch = 1;

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514 if(resort) {
515 resort = 0;
516 sort_timers();
517 }
518
519 /* in wait mode - compute the timeout */
520 if(wait) {
521 if(tfd_used) {
522 now = GETMSECS();
523# ifdef DEBUG
524 {
525 fprintf(stderr, "now=%"QUADFMT"u", now);
526 for(i = 0; i < tims_used; i++)
527 fprintf(stderr, "timers[%2d] = %"QUADFMT"d", i, tfd[i]->when - now);
528 }
529# endif
530 if((tout = tims[tfd[0]].when - now) < 0)
531 tout = 0;
532 } else
533 tout = INFTIM;
534 } else
535 tout = 0;
536
537# ifdef DEBUG
538 fprintf(stderr, "rpoll -- selecting with tout=%u", tout);
539# endif
540
541# ifdef USE_POLL
542 ret = poll(pfd, regs_used, tout);
543# endif
544
545# ifdef USE_SELECT
546 nrset = rset;
547 nwset = wset;
548 nxset = xset;
549 if(tout != INFTIM) {
550 tv.tv_sec = tout / 1000;
551 tv.tv_usec = (tout % 1000) * 1000;
552 }
553 ret = select(maxfd+1,
554 SELECT_CAST(&nrset),
555 SELECT_CAST(&nwset),
556 SELECT_CAST(&nxset), (tout==INFTIM) ? 0 : &tv);
557# endif
558
559 if(ret == -1) {
560 if(errno == EINTR)
561 return;
562 _panic("poll/select: %s", strerror(errno));
563 }
564

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569
570 assert(idx < regs_alloc);
571
572 if(regs[idx].fd >= 0) {
573 int mask = 0;
574
575# ifdef USE_POLL
576 if(regs[idx].pfd) {
577 if(regs[idx].pfd->revents & poll_in)
578 mask |= POLL_IN;
579 if(regs[idx].pfd->revents & poll_out)
580 mask |= POLL_OUT;
581 if(regs[idx].pfd->revents & poll_except)
582 mask |= POLL_EXCEPT;
583 }
584# endif
585# ifdef USE_SELECT
586 if(FD_ISSET(regs[idx].fd, &nrset))
587 mask |= POLL_IN;
588 if(FD_ISSET(regs[idx].fd, &nwset))
589 mask |= POLL_OUT;
590 if(FD_ISSET(regs[idx].fd, &nxset))
591 mask |= POLL_EXCEPT;
592# endif
593 assert(idx < regs_alloc);
594
595 if(mask) {
596 if(rpoll_trace)
597 fprintf(stderr, "poll_dispatch() -- "
598 "file %d/%d",
599 regs[idx].fd, idx);
600 (*regs[idx].func)(regs[idx].fd, mask, regs[idx].arg);
601 }
602 }
603
604 }
605 last_index++;
606 }
607
608 /* dispatch timeouts */
609 if(tfd_used) {
610 now = GETMSECS();
611 for(i = 0; i < tfd_used; i++) {
612 if(tfd[i] < 0)
613 continue;
614 if(tims[tfd[i]].when > now)
615 break;
616 if(rpoll_trace)
617 fprintf(stderr, "rpoll_dispatch() -- timeout %d",tfd[i]);
618 (*tims[tfd[i]].func)(tfd[i], tims[tfd[i]].arg);
619 if(tfd[i] < 0)
620 continue;
621 if(tims[tfd[i]].repeat)
622 tims[tfd[i]].when = now + tims[tfd[i]].msecs;
623 else {
624 tims[tfd[i]].func = NULL;
625 tims_used--;
626 tfd[i] = -1;
627 }
628 resort = 1;
629 }
630 }

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639double elaps(void);
640void infunc(int fd, int mask, void *arg);
641
642double
643elaps(void)
644{
645 gettimeofday(&now, NULL);
646
647 return (double)(10 * now.tv_sec + now.tv_usec / 100000 - 10 * start.tv_sec - start.tv_usec / 100000)
648 / 10;
649}
650
651void
652infunc(int fd, int mask, void *arg)
653{
654 char buf[1024];
655 int ret;
656

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670{
671 printf("%4.1f -- %d: %s\n", elaps(), tid, (char *)arg);
672}
673void
674tfunc1(int tid, void *arg)
675{
676 printf("%4.1f -- %d: %s\n", elaps(), tid, (char *)arg);
677}
678
679void first(int tid, void *arg);
680void second(int tid, void *arg);
681
682void
683second(int tid, void *arg)
684{
685 printf("%4.1f -- %d: %s\n", elaps(), tid, (char *)arg);
686 poll_start_timer(5500, 0, first, "first");
687 poll_stop_timer(t1);
688 t0 = poll_start_timer(1000, 1, tfunc0, "1 second");
689}
690void
691first(int tid, void *arg)
692{
693 printf("%4.1f -- %d: %s\n", elaps(), tid, (char *)arg);
694 poll_start_timer(3700, 0, second, "second");
695 poll_stop_timer(t0);
696 t1 = poll_start_timer(250, 1, tfunc1, "1/4 second");
697}
698
699int
700main(int argc, char *argv[])
701{
702 argc = argc;
703 argv = argv;
704 gettimeofday(&start, NULL);
705 poll_register(0, infunc, NULL, POLL_IN);
706 t0 = poll_start_timer(1000, 1, tfunc0, "1 second");
707 poll_start_timer(2500, 0, first, "first");
708
709 while(1)
710 poll_dispatch(1);
711
712 return 0;
713}
714# endif