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Annotation of 43BSDReno/lib/libc/gen/usleep.3, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)@(#)usleep.3        6.3 (Berkeley) 5/15/86
        !             6: .\"
        !             7: .TH USLEEP 3  "May 15, 1986"
        !             8: .UC 6
        !             9: .SH NAME
        !            10: usleep \- suspend execution for interval
        !            11: .SH SYNOPSIS
        !            12: .nf
        !            13: .B usleep(useconds)
        !            14: .B unsigned useconds;
        !            15: .fi
        !            16: .SH DESCRIPTION
        !            17: The current process is suspended from execution for the number
        !            18: of microseconds specified by the argument.
        !            19: The actual suspension time may be an arbitrary amount longer
        !            20: because of other activity in the system
        !            21: or because of the time spent in processing the call.
        !            22: .PP
        !            23: The routine is implemented by setting an interval timer
        !            24: and pausing until it occurs.
        !            25: The previous state of this timer is saved and restored.
        !            26: If the sleep time exceeds the time to the expiration of the
        !            27: previous timer,
        !            28: the process sleeps only until the signal would have occurred, and the
        !            29: signal is sent a short time later.
        !            30: .PP
        !            31: This routine is implemented using 
        !            32: .IR setitimer (2);
        !            33: it requires eight system calls each time it is invoked.
        !            34: A similar but less compatible function can be obtained with a single
        !            35: .IR select (2);
        !            36: it would not restart after signals, but would not interfere
        !            37: with other uses of
        !            38: .IR setitimer . 
        !            39: .SH "SEE ALSO"
        !            40: setitimer(2), getitimer(2), sigpause(2), ualarm(3), sleep(3), alarm(3)

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