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wait for default 10ms when blocking w/o timeout

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This commit is contained in:
Alex Shinn 2010-12-11 15:36:06 -08:00
parent 9c5dee322a
commit 59b4a306dc
1 changed files with 12 additions and 8 deletions
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12
lib/srfi/18/threads.c
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@ -513,18 +513,22 @@ sexp sexp_scheduler (sexp ctx sexp_api_params(self, n), sexp root_thread) {
sexp_insert_timed(ctx, tmp, tmp);
}
usecs = 0;
if ((sexp_context_timeval(res).tv_sec == 0)
&& (sexp_context_timeval(res).tv_usec == 0)) {
/* no timeout, wait for default 10ms */
usecs = 10*1000;
} else {
/* wait until the next timeout */
gettimeofday(&tval, NULL);
if (tval.tv_sec < sexp_context_timeval(res).tv_sec)
usecs = (sexp_context_timeval(res).tv_sec - tval.tv_sec) * 1000000;
if (tval.tv_usec < sexp_context_timeval(res).tv_usec)
if (tval.tv_usec < sexp_context_timeval(res).tv_usec || usecs > 0)
usecs += sexp_context_timeval(res).tv_usec - tval.tv_usec;
else if (usecs > 0)
usecs -= tval.tv_usec - sexp_context_timeval(res).tv_usec;
}
/* either wait on an fd, or just sleep */
pollfds = sexp_global(res, SEXP_G_THREADS_POLL_FDS);
if (sexp_portp(sexp_context_event(res)) && sexp_pollfdsp(pollfds)) {
if ((k = poll(sexp_pollfds_fds(pollfds), sexp_pollfds_num_fds(pollfds), usecs/1000)) > 0) {
fprintf(stderr, "polling\n");
pfds = sexp_pollfds_fds(pollfds);
goto unblock_io_threads;
}