#!/usr/bin/rexx
/*----------------------------------------------------------------------------*/
/* */
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/* Copyright (c) 2005-2006 Rexx Language Association. All rights reserved. */
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/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* ktguard.rex Open Object Rexx Samples */
/* */
/* */
/* -------------------------------------------------------------------------- */
/* */
/* Description: */
/* A guard instruction example. */
/* */
/* This program demonstrates the use of the start method and the guard */
/* instruction to control execution of several programs. In this sample, */
/* the programs are controlled by one 'guarded' variable. */
/******************************************************************************/
/* Define sample class and add methods we will use */
sample = .object~subclass('Sample')
m1 = 'expose g; guard off when g; use arg text; say text'
sample~define('WAIT_ON', m1)
m2 = 'expose g; use arg g'
sample~define('SETGUARD', m2)
/* Start up 10 invocations of WAIT_ON */
a = sample~new~~setguard(0) /* g is false so programs will */
/* wait on guard instruction */
do i = 1 to 10
say 'Start invocation' right(i,2) '(and wait)'
a~start('WAIT_ON', ' Invocation' right(i,2) 'completing')
end
/* Now let them all run */
say 'Press enter to set guard expression true...'
parse pull .
a~setguard(1) /* Setting g to 1 allows programs */
/* to run. */
