2011-03-30 13:49:47 +00:00
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.TH SLEEP 2
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.SH NAME
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sleep, alarm \- delay, ask for delayed note
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.SH SYNOPSIS
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.B #include <u.h>
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.br
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.B #include <libc.h>
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.PP
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.B
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int sleep(long millisecs)
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.PP
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.B
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2015-06-09 10:29:57 +00:00
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long alarm(ulong millisecs)
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2011-03-30 13:49:47 +00:00
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.SH DESCRIPTION
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.I Sleep
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suspends the current process for the number
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of milliseconds specified by the argument.
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The actual suspension time may be a little more or less than
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the requested time. If
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.I millisecs
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is 0, the process
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gives up the CPU if another process is waiting to run, returning
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immediately if not.
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Sleep returns \-1 if interrupted, 0 otherwise.
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.PP
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.I Alarm
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causes an
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.B alarm
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note (see
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.IR notify (2))
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to be sent to the invoking process after the number of milliseconds
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given by the argument.
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Successive calls to
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.I alarm
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reset the alarm clock.
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A zero argument clears the alarm.
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The return value is the amount of time previously remaining in
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the alarm clock.
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.SH SOURCE
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.B /sys/src/libc/9syscall
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.SH SEE ALSO
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.IR intro (2)
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.SH DIAGNOSTICS
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These functions set
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.IR errstr .
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