87 lines
5.5 KiB
Rexx
Executable File
87 lines
5.5 KiB
Rexx
Executable File
#!@OOREXX_SHEBANG_PROGRAM@
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/*----------------------------------------------------------------------------*/
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/* */
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/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved. */
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/* Copyright (c) 2005-2014 Rexx Language Association. All rights reserved. */
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/* */
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/* This program and the accompanying materials are made available under */
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/* the terms of the Common Public License v1.0 which accompanies this */
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/* distribution. A copy is also available at the following address: */
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/* https://www.oorexx.org/license.html */
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/* */
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/* Redistribution and use in source and binary forms, with or */
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/* without modification, are permitted provided that the following */
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/* conditions are met: */
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/* */
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/* Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in */
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/* the documentation and/or other materials provided with the distribution. */
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/* */
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/* Neither the name of Rexx Language Association nor the names */
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/* of its contributors may be used to endorse or promote products */
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/* derived from this software without specific prior written permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
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/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
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/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS */
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/* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
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/* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
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/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
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/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY */
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/* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
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/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/*----------------------------------------------------------------------------*/
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/******************************************************************************/
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/* greply.rex Open Object Rexx Samples */
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/* */
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/* Using the GUARD instruction to control methods */
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/* */
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/* */
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/* -------------------------------------------------------------------------- */
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/* */
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/* Description: */
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/* This program demonstrates the difference between Guarded and UnGuarded */
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/* methods. In the first example, the method is guarded, so it does not */
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/* begin execution until the final result is tallied. In the second */
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/* example, the method is unguarded so it can begin execution while method */
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/* sum_up is still looping. In fact, unguarded_get often runs immediately */
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/* after the Reply, so we use a guard instruction to ensure sum_up runs for */
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/* a bit before unguarded_get returns with the intermediate sum. */
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/******************************************************************************/
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/* guarded_get will wait until sum_up has completed */
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Say 'Using GUARDED method to wait until sum is complete:'
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Say 'Result should be 12502500:' .counter~new~~sum_up(5000)~guarded_get
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Say ''
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/* unguarded_get will begin execution before sum_up has completed */
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Say 'Using UNGUARDED method to obtain an intermediate result:'
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Say 'Result should be less than 12502500:' .counter~new~~sum_up(5000)~unguarded_get
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Exit
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::CLASS counter
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::Method sum_up
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Expose o_var
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o_var = 0 /* Initialize our counter */
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Reply o_var /* Early reply so others may run */
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Do i = 1 to arg(1) /* Loop here for a bit */
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o_var = o_var + i
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/* Let them know we're still here */
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If i//1000 = 0 Then Say 'Inside method sum_up: loop iteration' i
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End
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::Method guarded_get /* GUARD is default */
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Expose o_var
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Return o_var
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::Method unguarded_get unguarded
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Expose o_var
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Guard off when o_var > 9999 /* Wait until count progresses a bit */
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Return o_var /* Return intermediate result */
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