TH SLEEP 2
SH NAME
sleep, alarm \- delay, ask for delayed note
SH SYNOPSIS
B #include <u.h>
br
B #include <libc.h>
PP
B
int sleep(long millisecs)
PP
B
long alarm(ulong millisecs)
SH DESCRIPTION
I 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
I 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.
PP
I Alarm
causes an
B alarm
note (see
IR notify (2))
to be sent to the invoking process after the number of milliseconds
given by the argument.
Successive calls to
I 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.
SH SOURCE
B /sys/src/libc/9syscall
SH SEE ALSO
IR intro (2)
SH DIAGNOSTICS
These functions set
IR errstr .

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