talexander
/
freebsd_amp_hwpstate
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Eliminate the use of TS_TIMEOUT and ttstrt(). These are for handling 

tab delays etc.  pcvt was using them to recover from a (rarely lost)
race.  Use a little more locking to avoid the race.
This commit is contained in:
Bruce Evans 1995-07-31 21:35:17 +00:00
parent b42d2104dc
commit 7922019b1c
1 changed files with 14 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
sys/i386/isa/pcvt/pcvt_drv.c
View File

@ -928,10 +928,6 @@ pcrint(void)
#if PCVT_NETBSD || PCVT_FREEBSD >= 200
#if PCVT_NETBSD == 9
extern void ttrstrt();
#endif /* PCVT_NETBSD == 9 */
void
pcstart(register struct tty *tp)
{
@ -950,26 +946,28 @@ pcstart(register struct tty *tp)
async_update(UPDATE_KERN);
/*
* We need to do this outside spl since it could be fairly
* expensive and we don't want our serial ports to overflow.
*/
rbp = &tp->t_outq;
while (len = q_to_b(rbp, buf, PCVT_PCBURST))
sput(&buf[0], 0, len, minor(tp->t_dev));
/*
* Call q_to_b() at spltty() to ensure that the queue is empty when
* the loop terminates.
*/
s = spltty();
tp->t_state &= ~TS_BUSY;
if (rbp->c_cc)
while (len = q_to_b(rbp, buf, PCVT_PCBURST))
{
tp->t_state |= TS_TIMEOUT;
timeout(ttrstrt, tp, 1);
/*
* We need to do this outside spl since it could be fairly
* expensive and we don't want our serial ports to overflow.
*/
splx(s);
sput(&buf[0], 0, len, minor(tp->t_dev));
s = spltty();
}
tp->t_state &= ~TS_BUSY;
#ifndef TS_ASLEEP /* FreeBSD some time after 2.0.5 */
ttwwakeup(tp);
#else