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add a sleep to avoid busy work when the scheduler isn't loaded and we block on an output port

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Alex Shinn 2012-08-25 13:37:30 +09:00
parent 4bd428da9e
commit b31b52909e
1 changed files with 6 additions and 4 deletions
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8
vm.c
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@ -1967,7 +1967,7 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
#endif
i = sexp_write_string_n(ctx, sexp_bytes_data(tmp1), sexp_unbox_fixnum(_ARG2), _ARG3);
#if SEXP_USE_GREEN_THREADS
if (i < sexp_unbox_fixnum(_ARG2)) {
if (i < sexp_unbox_fixnum(_ARG2) && errno == EAGAIN) {
if (sexp_port_stream(_ARG3)) clearerr(sexp_port_stream(_ARG3));
/* modify stack in-place so we continue where we left off next time */
if (i > 0) {
@ -1978,10 +1978,12 @@ sexp sexp_apply (sexp ctx, sexp proc, sexp args) {
_ARG2 = sexp_make_fixnum(sexp_unbox_fixnum(_ARG2) - i);
}
/* yield if threads are enabled (otherwise busy loop) */
if (sexp_applicablep(sexp_global(ctx, SEXP_G_THREADS_BLOCKER))) {
/* TODO: the wait seems necessary on OS X to stop a print loop to ptys */
if (sexp_applicablep(sexp_global(ctx, SEXP_G_THREADS_BLOCKER)))
sexp_apply1(ctx, sexp_global(ctx, SEXP_G_THREADS_BLOCKER), _ARG3);
else /* no scheduler but output full, wait 5ms */
usleep(5*1000);
fuel = 0;
}
ip--; /* try again */
goto loop;
}