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cngetc: use cpu_spinwait to ease the cncheckc loop a tiny bit

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Reviewed by:	julian
MFC after:	10 days
This commit is contained in:
Andriy Gapon 2012-10-06 19:50:23 +00:00
parent 9d200697d7
commit 298fbd1605
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=241295
1 changed files with 1 additions and 1 deletions
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2
sys/kern/kern_cons.c
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@ -384,7 +384,7 @@ cngetc(void)
if (cn_mute)
return (-1);
while ((c = cncheckc()) == -1)
;
cpu_spinwait();
if (c == '\r')
c = '\n'; /* console input is always ICRNL */
return (c);