DELAY(9)                                                 DELAY(9)

     NAME
          delay, microdelay, addclock0link - small delays, clock
          interrupts

     SYNOPSIS
          void   delay(int ms)

          void   microdelay(int ┬Ás)

          Timer* addclock0link(void(*clockf)(void), int ms)

     DESCRIPTION
          Delay busy waits for ms milliseconds. The minimum value of
          ms is one on most architectures.

          Microdelay works exactly the same as delay but using
          microseconds instead.

          These routines are intended for use in interrupt contexts,
          device reset and shutdown functions, and other places where
          the scheduler is unavailable.  When you have a process con-
          text, and can sleep, consider tsleep(9). Tsleep does not
          busy wait.

          Addclock0link adds a new periodic timer to the current
          processor's timer list, with clockf executing every ms mil-
          liseconds. If ms is zero a default clock is used, it will
          panic otherwise (i.e.  ms < 0).

     SOURCE
          /sys/src/9/port/portclock.c
          /sys/src/9/*/clock.c

     SEE ALSO
          sleep(9)

     Page 1                       Plan 9              (printed 4/8/20)