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<title>sleep(3) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>SLEEP(3)</b><td align=right><b>SLEEP(3)</b>
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<p><font size=+1><b>NAME </b></font><br>
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sleep, alarm – delay, ask for delayed note<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include <u.h><br>
#include <libc.h>
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<tt><font size=+1>int sleep(long millisecs)
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<tt><font size=+1>long alarm(unsigned long millisecs)<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<i>Sleep</i> 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</i> 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.
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<i>Alarm</i> causes an <tt><font size=+1>alarm</font></tt> note (see <a href="../man3/notify.html"><i>notify</i>(3)</a>) to be sent to the invoking
process after the number of milliseconds given by the argument.
Successive calls to <i>alarm</i> reset the alarm clock. A zero argument
clears the alarm. The return value is the amount of time previously
remaining in the alarm clock.
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/lib9/sleep.c<br>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man3/intro.html"><i>intro</i>(3)</a><br>
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<p><font size=+1><b>DIAGNOSTICS </b></font><br>
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These functions set <i>errstr</i>.<br>
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<p><font size=+1><b>BUGS </b></font><br>
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To avoid name conflicts with the underlying system, <i>sleep</i> and
<i>alarm</i> are preprocessor macros defined as <i>p9sleep</i> and <i>p9alarm</i>;
see <a href="../man3/intro.html"><i>intro</i>(3)</a>.<br>
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