-- C940001.A
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-- C940001.A
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--
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--
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--
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--
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-- Grant of Unlimited Rights
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-- Grant of Unlimited Rights
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--
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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-- to do so.
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--
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--
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-- DISCLAIMER
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-- DISCLAIMER
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--
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--*
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--
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--
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-- OBJECTIVE:
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-- OBJECTIVE:
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-- Check that a protected object provides coordinated access to
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-- Check that a protected object provides coordinated access to
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-- shared data. Check that it can be used to sequence a number of tasks.
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-- shared data. Check that it can be used to sequence a number of tasks.
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-- Use the protected object to control a single token for which three
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-- Use the protected object to control a single token for which three
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-- tasks compete. Check that only one task is running at a time and that
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-- tasks compete. Check that only one task is running at a time and that
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-- all tasks get a chance to run sometime.
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-- all tasks get a chance to run sometime.
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--
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--
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-- TEST DESCRIPTION:
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-- TEST DESCRIPTION:
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-- Declare a protected type with two entries. A task may call the Take
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-- Declare a protected type with two entries. A task may call the Take
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-- entry to get a token which allows it to continue processing. If it
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-- entry to get a token which allows it to continue processing. If it
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-- has the token, it may call the Give entry to return it. The tasks
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-- has the token, it may call the Give entry to return it. The tasks
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-- implement a discipline whereby only the task with the token may be
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-- implement a discipline whereby only the task with the token may be
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-- active. The test does not require any specific order for the tasks
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-- active. The test does not require any specific order for the tasks
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-- to run.
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-- to run.
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--
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--
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--
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--
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-- CHANGE HISTORY:
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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-- 06 Dec 94 SAIC ACVC 2.0
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-- 07 Jul 96 SAIC Fixed spelling nits.
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-- 07 Jul 96 SAIC Fixed spelling nits.
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--
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--
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--!
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--!
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package C940001_0 is
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package C940001_0 is
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type Token_Type is private;
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type Token_Type is private;
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True_Token : constant Token_Type; -- Create a deferred constant in order
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True_Token : constant Token_Type; -- Create a deferred constant in order
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-- to provide a component init for the
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-- to provide a component init for the
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-- protected object
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-- protected object
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protected type Token_Mgr_Prot_Unit is
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protected type Token_Mgr_Prot_Unit is
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entry Take (T : out Token_Type);
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entry Take (T : out Token_Type);
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entry Give (T : in out Token_Type);
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entry Give (T : in out Token_Type);
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private
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private
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Token : Token_Type := True_Token;
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Token : Token_Type := True_Token;
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end Token_Mgr_Prot_Unit;
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end Token_Mgr_Prot_Unit;
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function Init_Token return Token_Type; -- call to initialize an
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function Init_Token return Token_Type; -- call to initialize an
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-- object of Token_Type
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-- object of Token_Type
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function Token_Value (T : Token_Type) return Boolean;
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function Token_Value (T : Token_Type) return Boolean;
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-- call to inspect the value of an
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-- call to inspect the value of an
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-- object of Token_Type
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-- object of Token_Type
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private
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private
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type Token_Type is new boolean;
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type Token_Type is new boolean;
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True_Token : constant Token_Type := true;
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True_Token : constant Token_Type := true;
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end C940001_0;
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end C940001_0;
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--=================================================================--
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--=================================================================--
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package body C940001_0 is
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package body C940001_0 is
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protected body Token_Mgr_Prot_Unit is
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protected body Token_Mgr_Prot_Unit is
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entry Take (T : out Token_Type) when Token = true is
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entry Take (T : out Token_Type) when Token = true is
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begin -- Calling task will Take the token, so
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begin -- Calling task will Take the token, so
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T := Token; -- check first that token_mgr owns the
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T := Token; -- check first that token_mgr owns the
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Token := false; -- token to give, then give it to caller
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Token := false; -- token to give, then give it to caller
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end Take;
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end Take;
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entry Give (T : in out Token_Type) when Token = false is
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entry Give (T : in out Token_Type) when Token = false is
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begin -- Calling task will Give the token back,
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begin -- Calling task will Give the token back,
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if T = true then -- so first check that token_mgr does not
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if T = true then -- so first check that token_mgr does not
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Token := T; -- own the token, then check that the task has
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Token := T; -- own the token, then check that the task has
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T := false; -- the token to give, then take it from the
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T := false; -- the token to give, then take it from the
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end if; -- task
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end if; -- task
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-- if caller does not own the token, then
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-- if caller does not own the token, then
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end Give; -- it falls out of the entry body with no
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end Give; -- it falls out of the entry body with no
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end Token_Mgr_Prot_Unit; -- action
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end Token_Mgr_Prot_Unit; -- action
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function Init_Token return Token_Type is
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function Init_Token return Token_Type is
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begin
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begin
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return false;
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return false;
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end Init_Token;
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end Init_Token;
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function Token_Value (T : Token_Type) return Boolean is
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function Token_Value (T : Token_Type) return Boolean is
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begin
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begin
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return Boolean (T);
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return Boolean (T);
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end Token_Value;
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end Token_Value;
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end C940001_0;
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end C940001_0;
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--===============================================================--
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--===============================================================--
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with Report;
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with Report;
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with ImpDef;
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with ImpDef;
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with C940001_0;
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with C940001_0;
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procedure C940001 is
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procedure C940001 is
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type TC_Int_Type is range 0..2;
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type TC_Int_Type is range 0..2;
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-- range is very narrow so that erroneous execution may
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-- range is very narrow so that erroneous execution may
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-- raise Constraint_Error
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-- raise Constraint_Error
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type TC_Artifact_Type is record
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type TC_Artifact_Type is record
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TC_Int : TC_Int_Type := 1;
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TC_Int : TC_Int_Type := 1;
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Number_of_Accesses : integer := 0;
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Number_of_Accesses : integer := 0;
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end record;
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end record;
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TC_Artifact : TC_Artifact_Type;
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TC_Artifact : TC_Artifact_Type;
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Sequence_Mgr : C940001_0.Token_Mgr_Prot_Unit;
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Sequence_Mgr : C940001_0.Token_Mgr_Prot_Unit;
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procedure Bump (Item : in out TC_Int_Type) is
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procedure Bump (Item : in out TC_Int_Type) is
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begin
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begin
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Item := Item + 1;
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Item := Item + 1;
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exception
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exception
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when Constraint_Error =>
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when Constraint_Error =>
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Report.Failed ("Incremented without corresponding decrement");
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Report.Failed ("Incremented without corresponding decrement");
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when others =>
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when others =>
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Report.Failed ("Bump raised Unexpected Exception");
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Report.Failed ("Bump raised Unexpected Exception");
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end Bump;
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end Bump;
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procedure Decrement (Item : in out TC_Int_Type) is
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procedure Decrement (Item : in out TC_Int_Type) is
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begin
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begin
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Item := Item - 1;
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Item := Item - 1;
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exception
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exception
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when Constraint_Error =>
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when Constraint_Error =>
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Report.Failed ("Decremented without corresponding increment");
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Report.Failed ("Decremented without corresponding increment");
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when others =>
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when others =>
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Report.Failed ("Decrement raised Unexpected Exception");
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Report.Failed ("Decrement raised Unexpected Exception");
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end Decrement;
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end Decrement;
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--==============--
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--==============--
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task type Network_Node_Type;
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task type Network_Node_Type;
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task body Network_Node_Type is
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task body Network_Node_Type is
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Slot_for_Token : C940001_0.Token_Type := C940001_0.Init_Token;
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Slot_for_Token : C940001_0.Token_Type := C940001_0.Init_Token;
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begin
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begin
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-- Ask for token - if request is not granted, task will be queued
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-- Ask for token - if request is not granted, task will be queued
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Sequence_Mgr.Take (Slot_for_Token);
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Sequence_Mgr.Take (Slot_for_Token);
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-- Task now has token and may perform its work
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-- Task now has token and may perform its work
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--==========================--
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--==========================--
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-- in this case, the work is to ensure that the test results
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-- in this case, the work is to ensure that the test results
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-- are the expected ones!
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-- are the expected ones!
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--==========================--
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--==========================--
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Bump (TC_Artifact.TC_Int); -- increment when request is granted
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Bump (TC_Artifact.TC_Int); -- increment when request is granted
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TC_Artifact.Number_Of_Accesses :=
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TC_Artifact.Number_Of_Accesses :=
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TC_Artifact.Number_Of_Accesses + 1;
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TC_Artifact.Number_Of_Accesses + 1;
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if not C940001_0.Token_Value ( Slot_for_Token) then
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if not C940001_0.Token_Value ( Slot_for_Token) then
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Report.Failed ("Incorrect results from entry Take");
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Report.Failed ("Incorrect results from entry Take");
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end if;
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end if;
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-- give a chance for other tasks to (incorrectly) run
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-- give a chance for other tasks to (incorrectly) run
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delay ImpDef.Minimum_Task_Switch;
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delay ImpDef.Minimum_Task_Switch;
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Decrement (TC_Artifact.TC_Int); -- prepare to return token
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Decrement (TC_Artifact.TC_Int); -- prepare to return token
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-- Task has completed its work and will return token
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-- Task has completed its work and will return token
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Sequence_Mgr.Give (Slot_for_Token); -- return token to sequence manager
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Sequence_Mgr.Give (Slot_for_Token); -- return token to sequence manager
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if c940001_0.Token_Value (Slot_for_Token) then
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if c940001_0.Token_Value (Slot_for_Token) then
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Report.Failed ("Incorrect results from entry Give");
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Report.Failed ("Incorrect results from entry Give");
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end if;
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end if;
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exception
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exception
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when others => Report.Failed ("Unexpected exception raised in task");
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when others => Report.Failed ("Unexpected exception raised in task");
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end Network_Node_Type;
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end Network_Node_Type;
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--==============--
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--==============--
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begin
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begin
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Report.Test ("C940001", "Check that a protected object can control " &
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Report.Test ("C940001", "Check that a protected object can control " &
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"tasks by coordinating access to shared data");
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"tasks by coordinating access to shared data");
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declare
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declare
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Node_1, Node_2, Node_3 : Network_Node_Type;
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Node_1, Node_2, Node_3 : Network_Node_Type;
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-- declare three tasks which will compete for
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-- declare three tasks which will compete for
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-- a single token, managed by Sequence Manager
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-- a single token, managed by Sequence Manager
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begin -- tasks start
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begin -- tasks start
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null;
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null;
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end; -- wait for all tasks to terminate before reporting result
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end; -- wait for all tasks to terminate before reporting result
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if TC_Artifact.Number_of_Accesses /= 3 then
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if TC_Artifact.Number_of_Accesses /= 3 then
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Report.Failed ("Not all tasks got through");
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Report.Failed ("Not all tasks got through");
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end if;
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end if;
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Report.Result;
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Report.Result;
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end C940001;
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end C940001;
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