delay, microdelay, addclock0link - small delays, clock interrupts void delay(int n)

void microdelay(int n)

void addclock0link(void(*clockf)(void))

Delay busy waits for n milliseconds, forced to be at least one millisecond.

Microdelay is similar, but busy waits for n microseconds.

For delays on the order of clock ticks, tsleep (see sleep (9)) provides a better alternative to the busy waiting of these routines.

Addclock0link adds clockf to a list of functions to be executed at each clock interrupt on the first processor.

/sys/src/9/port/portclock.c

/sys/src/9/*/clock.c

sleep (9)