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 milliseconds 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.

Plan 9  —  December 11, 1999