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Command: delay | Section: 9 | Source: NetBSD | File: delay.9
DELAY(9) FreeBSD Kernel Developer's Manual DELAY(9)
NAME
delay, DELAY - microsecond delay
SYNOPSIS
#include <sys/param.h>
void
delay(unsigned int us);
void
DELAY(unsigned int us);
DESCRIPTION
Wait approximately us microseconds.
The delay is implemented as a machine loop, preventing events other than
interrupt handlers for unmasked interrupts to run. DELAY() is reentrant
(doesn't modify any global kernel or machine state) and is safe to use in
interrupt or process context.
For long delays, condition variables should be considered, however they
can only be used from process context and their resolution is limited by
the system clock frequency.
SEE ALSO
condvar(9), hz(9), kpause(9)
FreeBSD 14.1-RELEASE-p8 July 20, 2011 FreeBSD 14.1-RELEASE-p8