.if n .pH rn4.chap6 @(#)chap6	40.29
.\" Copyright 1989 AT&T
.BK "Software Notes"
.CH "Real Time Processing" "6"
.H 1 "Real Time Processing Notes"
.IX istart UNIX System V Release 4, real time processing notes
.H 2 "High-Resolution Timers"
.H 3 "Source Compatibility"
In Release 4.0, \f4gettimeofday\f1 and \f4settimefoday\f1 
take one argument.  The second argument used with the
respective BSD calls (and in the BSD compatibility library)
has long been obsolete and is ignored.
.P
In BSD, the \f4alarm\f1(3) and \f4sleep\f1(3) functions
are written using \f4setitimer\f1 [see \f4getitimer\fP(3C)].
.IX \f4getitimer\fP(3C)
In Release 4.0, \f4alarm\f1(2) is independent of \f4setitimer\f1.
In Release 4.0, a \f4sleep\fP following a \f4setitimer\fP wipes out
knowledge of the user signal handler; do not use \f4setitimer\fP with \f4sleep\fP.
.H 3 "Future Directions"
These routines will be included in SVR4.0 until the POSIX P1003.4
standard on Real Time System Interfaces is completed.
.IX iend UNIX System V Release 4, real time processing notes
