Author: avg
Date: Sat Oct 6 19:50:23 2012
New Revision: 241295
URL: http://svn.freebsd.org/changeset/base/241295
Log:
cngetc: use cpu_spinwait to ease the cncheckc loop a tiny bit
Reviewed by: julian
MFC after: 10 days
Modified:
head/sys/kern/kern_cons.c
Modified: head/sys/kern/kern_cons.c
==============================================================================
--- head/sys/kern/kern_cons.c Sat Oct 6 19:48:15 2012 (r241294)
+++ head/sys/kern/kern_cons.c Sat Oct 6 19:50:23 2012 (r241295)
@@ -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);
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