Libc-594.1.4.tar.gz

[apple/libc.git] / gen / usleep.3

diff --git a/gen/usleep.3 b/gen/usleep.3
index 058c7d5ae02796467d15392e98e7145c1e7c1dc6..acee9a30d9bcbb502cc2bf59ff00b158b3536485 100644 (file)
--- a/gen/usleep.3
+++ b/gen/usleep.3
@@ -30,37 +30,41 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     @(#)usleep.3   8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/gen/usleep.3,v 1.10.2.7 2001/12/14 18:33:51 ru Exp $
+.\" $FreeBSD: src/lib/libc/gen/usleep.3,v 1.18 2002/12/29 00:59:09 mike Exp $
 .\"
 .Dd February 13, 1998
 .Dt USLEEP 3
 .Os
 .Sh NAME
 .Nm usleep
-.Nd suspend process execution for an interval measured in microseconds
+.Nd suspend thread execution for an interval measured in microseconds
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
 .In unistd.h
 .Ft int
-.Fn usleep "unsigned int microseconds"
+.Fo usleep
+.Fa "useconds_t useconds"
+.Fc
 .Sh DESCRIPTION
 The
 .Fn usleep
-function suspends execution of the calling process until either
-.Fa microseconds
-microseconds have elapsed or a signal is delivered to the process and its
-action is to invoke a signal-catching function or to terminate the
-process.
-System activity may lengthen the sleep by an indeterminate amount.
+function suspends execution of the calling thread until either
+.Fa useconds
+microseconds have elapsed
+or a signal is delivered to the thread whose action
+is to invoke a signal-catching function
+or to terminate the thread or process.
+The actual time slept may be longer, due to system latencies
+and possible limitations in the timer resolution of the hardware.
 .Pp
-This function is implemented using
-.Xr nanosleep 2
+This function is implemented, using
+.Xr nanosleep 2 ,
 by pausing for
-.Fa microseconds
+.Fa useconds
 microseconds or until a signal occurs.
 Consequently, in this implementation,
-sleeping has no effect on the state of process timers,
+sleeping has no effect on the state of process timers
 and there is no special handling for SIGALRM.
 .Sh RETURN VALUES
 .Rv -std usleep