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Slight performance improvement.

This commit is contained in:
mycroft 1993-04-20 23:45:21 +00:00
parent 95c46ca69f
commit dcdfedf042
1 changed files with 14 additions and 13 deletions
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27
sys/arch/i386/isa/pccons.c
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@ -52,7 +52,7 @@
* cleanup, removed ctl-alt-del.
*/
static char rcsid[] = "$Header: /cvsroot/src/sys/arch/i386/isa/Attic/pccons.c,v 1.8 1993/04/20 23:09:36 mycroft Exp $";
static char rcsid[] = "$Header: /cvsroot/src/sys/arch/i386/isa/Attic/pccons.c,v 1.9 1993/04/20 23:45:21 mycroft Exp $";
/*
* code to work keyboard & display for PC-style console
@ -451,16 +451,26 @@ pcxint(dev)
pcstart(tp)
register struct tty *tp;
{
register struct ringb *rbp;
int c, s;
s = spltty();
if (tp->t_state & (TS_TIMEOUT|TS_BUSY|TS_TTSTOP))
goto out;
do {
if (RB_LEN(&tp->t_out) <= tp->t_lowat) {
rbp = &tp->t_out;
while(RB_LEN(rbp)) {
char c = getc(rbp);
if (!c) continue;
tp->t_state |= TS_BUSY;
splx(s);
sput(c, 0);
s = spltty();
tp->t_state &= ~TS_BUSY;
}
if (RB_LEN(rbp) <= tp->t_lowat) {
if (tp->t_state&TS_ASLEEP) {
tp->t_state &= ~TS_ASLEEP;
wakeup((caddr_t)&tp->t_out);
wakeup((caddr_t)rbp);
}
if (tp->t_wsel) {
selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
@ -468,15 +478,6 @@ pcstart(tp)
tp->t_state &= ~TS_WCOLL;
}
}
if (RB_LEN(&tp->t_out) == 0)
goto out;
c = getc(&tp->t_out);
tp->t_state |= TS_BUSY; /* 21 Aug 92*/
splx(s);
if (c) sput(c, 0);
(void)spltty();
tp->t_state &= ~TS_BUSY; /* 21 Aug 92*/
} while(1);
out:
splx(s);
}