SLEEP(3) SLEEP(3)
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(3)) 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
/src/lib9/sleep.c
SEE ALSO
intro(3)
DIAGNOSTICS
These functions set errstr.
BUGS
To avoid name conflicts with the underlying system, sleep
and alarm are preprocessor macros defined as p9sleep and
p9alarm; see intro(3).