delay(9) - NetBSD Manual Pages

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DELAY(9)               NetBSD Kernel Developer's Manual               DELAY(9)


NAME

     delay, DELAY -- microsecond delay


SYNOPSIS

     #include <machine/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 6.0.1                     July 20, 2011                    NetBSD 6.0.1