| DELAY(9) | Kernel Developer's Manual | DELAY(9) | 
delay, DELAY —
#include <machine/param.h>
void
  
  delay(unsigned
    int us);
void
  
  DELAY(unsigned
    int us);
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.
| July 20, 2011 | NetBSD 9.3 |