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This commit is contained in:
gmcgarry 2002-08-04 01:16:09 +00:00
parent 15c98684c7
commit 42fef49b5c
1 changed files with 14 additions and 1 deletions
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15
share/man/man9/delay.9
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@ -1,4 +1,4 @@
.\" $NetBSD: delay.9,v 1.1 2002/05/25 02:16:37 gmcgarry Exp $
.\" $NetBSD: delay.9,v 1.2 2002/08/04 01:16:09 gmcgarry Exp $
.\"
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -51,3 +51,16 @@
Wait approximately
.Fa us
microseconds.
.Pp
The delay is implemented as a machine loop, preventing events other than
interrupt handlers for unmasked interrupts to run.
.Fn DELAY
is safe to use in interrupt or process context.
.Pp
For long delays,
.Xr tsleep 9
should be considered, however it can only be called from process context
and its resolution is limited by the system clock frequency.
.Sh SEE ALSO
.Xr hz 9 ,
.Xr tsleep 9