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DELAY(9)                   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)

NetBSD 10.99                     July 20, 2011                    NetBSD 10.99