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Adjust the low and high watermarks. Based on a suggestion from Lennart 

Augustsson.
This commit is contained in:
mycroft 1996-02-08 03:05:34 +00:00
parent 7366dec9ec
commit 47246947c7
1 changed files with 12 additions and 18 deletions
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30
sys/dev/audio.c
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@ -1,4 +1,4 @@
/* $NetBSD: audio.c,v 1.15 1996/02/05 21:11:10 scottr Exp $ */
/* $NetBSD: audio.c,v 1.16 1996/02/08 03:05:34 mycroft Exp $ */
/*
* Copyright (c) 1991-1993 Regents of the University of California.
@ -441,11 +441,8 @@ audio_initbufs(sc)
audio_init_ring(&sc->rr, sc->sc_blksize);
audio_init_ring(&sc->pr, sc->sc_blksize);
sc->sc_lowat = 1;
if (nblk == 1)
sc->sc_hiwat = 1;
else
sc->sc_hiwat = nblk - sc->sc_lowat;
sc->sc_lowat = nblk / 2;
sc->sc_hiwat = nblk;
}
static inline int
@ -934,18 +931,15 @@ audio_write(dev, uio, ioflag)
error = 0;
while (uio->uio_resid > 0) {
int watermark = sc->sc_hiwat;
while (cb->nblk > watermark) {
DPRINTF(("audio_write: nblk=%d watermark=%d\n", cb->nblk, watermark));
if (ioflag & IO_NDELAY) {
error = EWOULDBLOCK;
return (error);
}
error = audio_sleep(&sc->sc_wchan, "aud wr");
if (error != 0) {
return (error);
}
watermark = sc->sc_lowat;
if (cb->nblk >= sc->sc_hiwat) {
do {
DPRINTF(("audio_write: nblk=%d hiwat=%d lowat=%d\n", cb->nblk, sc->sc_hiwat, sc->sc_lowat));
if (ioflag & IO_NDELAY)
return (EWOULDBLOCK);
error = audio_sleep(&sc->sc_wchan, "aud wr");
if (error)
return (error);
} while (cb->nblk >= sc->sc_lowat);
}
#if 0
if (cb->nblk == 0 &&