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No more pause on tty output in case of clist overflow.

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This commit is contained in:
Serge Vakulenko
2015-01-20 18:09:13 -08:00
parent 8e228dde62
commit d8269d1996
1 changed files with 15 additions and 8 deletions
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23
sys/kernel/tty.c
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@@ -1568,10 +1568,19 @@ loop:
if (ce == 0) {
tp->t_rocount = 0;
if (ttyoutput(*cp, tp) >= 0) {
/* no c-lists, wait a bit */
ttstart(tp);
sleep((caddr_t)&lbolt, TTOPRI);
goto loop;
overflow: /* out of c-lists */
s = spltty();
ttstart(tp);
if (flag & IO_NDELAY) {
splx(s);
uio->uio_resid += cc;
return (uio->uio_resid == cnt ?
EWOULDBLOCK : 0);
}
tp->t_state |= TS_ASLEEP;
sleep((caddr_t)&tp->t_outq, TTOPRI);
splx(s);
goto loop;
}
cp++, cc--;
if (tp->t_flags & FLUSHO ||
@@ -1597,10 +1606,8 @@ loop:
tk_nout += ce;
#endif
if (i > 0) {
/* out of c-lists, wait a bit */
ttstart(tp);
sleep((caddr_t)&lbolt, TTOPRI);
goto loop;
/* out of c-lists */
goto overflow;
}
if (tp->t_flags & FLUSHO || tp->t_outq.c_cc > hiwat)
break;