SLEEP(2)                                                 SLEEP(2)

     NAME
          sleep, alarm - delay, ask for delayed note

     SYNOPSIS
          #include <u.h>
          #include <libc.h>

          int sleep(long millisecs)

          long alarm(unsigned long millisecs)

     DESCRIPTION
          Sleep suspends the current process for the number of mil-
          liseconds specified by the argument.  The actual suspension
          time may be a little more or less than the requested time.
          If millisecs is 0, the process gives up the CPU if another
          process is waiting to run, returning immediately if not.
          Sleep returns -1 if interrupted, 0 otherwise.

          Alarm causes an alarm note (see notify(2)) to be sent to the
          invoking process after the number of milliseconds given by
          the argument.  Successive calls to alarm reset the alarm
          clock.  A zero argument clears the alarm.  The return value
          is the amount of time previously remaining in the alarm
          clock.

     SOURCE
          /sys/src/libc/9syscall

     SEE ALSO
          intro(2)

     DIAGNOSTICS
          These functions set errstr.