-- C940002.A
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-- C940002.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 shared
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-- Check that a protected object provides coordinated access to shared
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-- data. Check that it can implement a semaphore-like construct using a
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-- data. Check that it can implement a semaphore-like construct using a
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-- parameterless procedure which allows a specific maximum number of tasks
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-- parameterless procedure which allows a specific maximum number of tasks
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-- to run and excludes all others
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-- to run and excludes all others
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--
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--
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-- TEST DESCRIPTION:
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-- TEST DESCRIPTION:
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-- Implement a counting semaphore type that can be initialized to a
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-- Implement a counting semaphore type that can be initialized to a
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-- specific number of available resources. Declare an entry for
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-- specific number of available resources. Declare an entry for
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-- requesting a resource and a procedure for releasing it. Declare an
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-- requesting a resource and a procedure for releasing it. Declare an
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-- object of this type, initialized to two resources. Declare and start
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-- object of this type, initialized to two resources. Declare and start
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-- three tasks each of which asks for a resource. Verify that only two
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-- three tasks each of which asks for a resource. Verify that only two
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-- resources are granted and that the last task in is queued.
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-- resources are granted and that the last task in is queued.
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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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--
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--
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--!
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--!
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package C940002_0 is
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package C940002_0 is
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-- Semaphores
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-- Semaphores
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protected type Semaphore_Type (Resources_Available : Integer :=1) is
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protected type Semaphore_Type (Resources_Available : Integer :=1) is
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entry Request;
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entry Request;
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procedure Release;
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procedure Release;
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function Available return Integer;
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function Available return Integer;
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private
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private
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Currently_Available : Integer := Resources_Available;
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Currently_Available : Integer := Resources_Available;
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end Semaphore_Type;
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end Semaphore_Type;
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Max_Resources : constant Integer := 2;
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Max_Resources : constant Integer := 2;
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Resource : Semaphore_Type (Max_Resources);
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Resource : Semaphore_Type (Max_Resources);
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end C940002_0;
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end C940002_0;
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-- Semaphores;
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-- Semaphores;
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--========================================================--
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--========================================================--
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package body C940002_0 is
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package body C940002_0 is
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-- Semaphores
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-- Semaphores
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protected body Semaphore_Type is
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protected body Semaphore_Type is
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entry Request when Currently_Available >0 is -- when granted, secures
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entry Request when Currently_Available >0 is -- when granted, secures
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begin -- a resource
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begin -- a resource
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Currently_Available := Currently_Available - 1;
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Currently_Available := Currently_Available - 1;
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end Request;
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end Request;
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procedure Release is -- when called, releases
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procedure Release is -- when called, releases
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begin -- a resource
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begin -- a resource
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Currently_Available := Currently_Available + 1;
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Currently_Available := Currently_Available + 1;
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end Release;
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end Release;
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function Available return Integer is -- returns number of
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function Available return Integer is -- returns number of
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begin -- available resources
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begin -- available resources
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return Currently_Available;
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return Currently_Available;
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end Available;
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end Available;
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end Semaphore_Type;
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end Semaphore_Type;
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end C940002_0;
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end C940002_0;
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-- Semaphores;
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-- Semaphores;
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--========================================================--
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--========================================================--
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package C940002_1 is
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package C940002_1 is
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-- Task_Pkg
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-- Task_Pkg
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task type Requesting_Task is
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task type Requesting_Task is
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entry Done; -- call on Done instructs the task
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entry Done; -- call on Done instructs the task
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end Requesting_Task; -- to release resource
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end Requesting_Task; -- to release resource
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type Task_Ptr is access Requesting_Task;
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type Task_Ptr is access Requesting_Task;
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protected Counter is
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protected Counter is
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procedure Increment;
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procedure Increment;
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procedure Decrement;
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procedure Decrement;
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function Number return integer;
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function Number return integer;
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private
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private
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Count : Integer := 0;
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Count : Integer := 0;
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end Counter;
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end Counter;
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protected Hold_Lock is
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protected Hold_Lock is
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procedure Lock;
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procedure Lock;
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procedure Unlock;
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procedure Unlock;
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function Locked return Boolean;
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function Locked return Boolean;
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private
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private
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Lock_State : Boolean := true; -- starts out locked
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Lock_State : Boolean := true; -- starts out locked
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end Hold_Lock;
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end Hold_Lock;
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end C940002_1;
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end C940002_1;
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-- Task_Pkg
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-- Task_Pkg
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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 C940002_0;
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with C940002_0;
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-- Semaphores;
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-- Semaphores;
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package body C940002_1 is
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package body C940002_1 is
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-- Task_Pkg is
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-- Task_Pkg is
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protected body Counter is
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protected body Counter is
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procedure Increment is
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procedure Increment is
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begin
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begin
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Count := Count + 1;
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Count := Count + 1;
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end Increment;
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end Increment;
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procedure Decrement is
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procedure Decrement is
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begin
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begin
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Count := Count - 1;
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Count := Count - 1;
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end Decrement;
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end Decrement;
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function Number return Integer is
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function Number return Integer is
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begin
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begin
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return Count;
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return Count;
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end Number;
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end Number;
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end Counter;
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end Counter;
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protected body Hold_Lock is
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protected body Hold_Lock is
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procedure Lock is
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procedure Lock is
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begin
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begin
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Lock_State := true;
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Lock_State := true;
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end Lock;
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end Lock;
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procedure Unlock is
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procedure Unlock is
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begin
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begin
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Lock_State := false;
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Lock_State := false;
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end Unlock;
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end Unlock;
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function Locked return Boolean is
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function Locked return Boolean is
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begin
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begin
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return Lock_State;
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return Lock_State;
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end Locked;
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end Locked;
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end Hold_Lock;
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end Hold_Lock;
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task body Requesting_Task is
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task body Requesting_Task is
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begin
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begin
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C940002_0.Resource.Request; -- request a resource
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C940002_0.Resource.Request; -- request a resource
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-- if resource is not available,
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-- if resource is not available,
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-- task will be queued to wait
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-- task will be queued to wait
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Counter.Increment; -- add to count of resources obtained
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Counter.Increment; -- add to count of resources obtained
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Hold_Lock.Unlock; -- and unlock Lock - system is stable;
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Hold_Lock.Unlock; -- and unlock Lock - system is stable;
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-- status may now be queried
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-- status may now be queried
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accept Done do -- hold resource until Done is called
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accept Done do -- hold resource until Done is called
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C940002_0.Resource.Release; -- release the resource and
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C940002_0.Resource.Release; -- release the resource and
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Counter.Decrement; -- note release
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Counter.Decrement; -- note release
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end Done;
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end Done;
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exception
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exception
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when others => Report.Failed ("Unexpected Exception in Requesting_Task");
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when others => Report.Failed ("Unexpected Exception in Requesting_Task");
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end Requesting_Task;
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end Requesting_Task;
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end C940002_1;
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end C940002_1;
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-- Task_Pkg;
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-- Task_Pkg;
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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 C940002_0,
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with C940002_0,
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-- Semaphores,
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-- Semaphores,
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C940002_1;
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C940002_1;
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-- Task_Pkg;
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-- Task_Pkg;
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procedure C940002 is
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procedure C940002 is
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package Semaphores renames C940002_0;
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package Semaphores renames C940002_0;
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package Task_Pkg renames C940002_1;
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package Task_Pkg renames C940002_1;
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Ptr1,
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Ptr1,
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Ptr2,
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Ptr2,
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Ptr3 : Task_Pkg.Task_Ptr;
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Ptr3 : Task_Pkg.Task_Ptr;
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Num : Integer;
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Num : Integer;
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procedure Spinlock is
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procedure Spinlock is
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begin
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begin
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-- loop until unlocked
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-- loop until unlocked
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while Task_Pkg.Hold_Lock.Locked loop
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while Task_Pkg.Hold_Lock.Locked loop
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delay ImpDef.Minimum_Task_Switch;
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delay ImpDef.Minimum_Task_Switch;
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end loop;
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end loop;
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Task_Pkg.Hold_Lock.Lock;
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Task_Pkg.Hold_Lock.Lock;
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end Spinlock;
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end Spinlock;
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begin
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begin
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Report.Test ("C940002", "Check that a protected record can be used to " &
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Report.Test ("C940002", "Check that a protected record can be used to " &
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"control access to resources");
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"control access to resources");
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if (Task_Pkg.Counter.Number /=0)
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if (Task_Pkg.Counter.Number /=0)
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or (Semaphores.Resource.Available /= 2) then
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or (Semaphores.Resource.Available /= 2) then
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Report.Failed ("Wrong initial conditions");
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Report.Failed ("Wrong initial conditions");
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end if;
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end if;
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Ptr1 := new Task_Pkg.Requesting_Task; -- newly allocated task requests
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Ptr1 := new Task_Pkg.Requesting_Task; -- newly allocated task requests
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-- resource; request for resource should
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-- resource; request for resource should
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-- be granted
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-- be granted
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Spinlock; -- ensure that task obtains resource
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Spinlock; -- ensure that task obtains resource
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-- Task 1 waiting for call to Done
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-- Task 1 waiting for call to Done
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-- One resource assigned to task 1
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-- One resource assigned to task 1
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-- One resource still available
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-- One resource still available
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if (Task_Pkg.Counter.Number /= 1)
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if (Task_Pkg.Counter.Number /= 1)
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or (Semaphores.Resource.Available /= 1) then
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or (Semaphores.Resource.Available /= 1) then
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Report.Failed ("Resource not assigned to task 1");
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Report.Failed ("Resource not assigned to task 1");
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end if;
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end if;
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Ptr2 := new Task_Pkg.Requesting_Task; -- newly allocated task requests
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Ptr2 := new Task_Pkg.Requesting_Task; -- newly allocated task requests
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-- resource; request for resource should
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-- resource; request for resource should
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-- be granted
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-- be granted
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Spinlock; -- ensure that task obtains resource
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Spinlock; -- ensure that task obtains resource
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-- Task 1 waiting for call to Done
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-- Task 1 waiting for call to Done
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-- Task 2 waiting for call to Done
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-- Task 2 waiting for call to Done
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-- Resources held by tasks 1 and 2
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-- Resources held by tasks 1 and 2
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-- No resources available
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-- No resources available
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if (Task_Pkg.Counter.Number /= 2)
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if (Task_Pkg.Counter.Number /= 2)
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or (Semaphores.Resource.Available /= 0) then
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or (Semaphores.Resource.Available /= 0) then
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Report.Failed ("Resource not assigned to task 2");
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Report.Failed ("Resource not assigned to task 2");
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end if;
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end if;
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Ptr3 := new Task_Pkg.Requesting_Task; -- newly allocated task requests
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Ptr3 := new Task_Pkg.Requesting_Task; -- newly allocated task requests
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-- resource; request for resource should
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-- resource; request for resource should
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-- be denied and task queued to wait for
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-- be denied and task queued to wait for
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-- next available resource
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-- next available resource
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Ptr1.all.Done; -- Task 1 releases resource and lock
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Ptr1.all.Done; -- Task 1 releases resource and lock
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-- Resource should be given to queued task
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-- Resource should be given to queued task
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Spinlock; -- ensure that resource is released
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Spinlock; -- ensure that resource is released
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-- Task 1 holds no resource
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-- Task 1 holds no resource
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-- One resource still assigned to task 2
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-- One resource still assigned to task 2
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-- One resource assigned to task 3
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-- One resource assigned to task 3
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-- No resources available
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-- No resources available
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if (Task_Pkg.Counter.Number /= 2)
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if (Task_Pkg.Counter.Number /= 2)
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or (Semaphores.Resource.Available /= 0) then
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or (Semaphores.Resource.Available /= 0) then
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Report.Failed ("Resource not properly released/assigned to task 3");
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Report.Failed ("Resource not properly released/assigned to task 3");
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end if;
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end if;
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Ptr2.all.Done; -- Task 2 releases resource and lock
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Ptr2.all.Done; -- Task 2 releases resource and lock
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-- No outstanding request for resource
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-- No outstanding request for resource
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-- Tasks 1 and 2 hold no resources
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-- Tasks 1 and 2 hold no resources
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-- One resource assigned to task 3
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-- One resource assigned to task 3
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-- One resource available
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-- One resource available
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if (Task_Pkg.Counter.Number /= 1)
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if (Task_Pkg.Counter.Number /= 1)
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or (Semaphores.Resource.Available /= 1) then
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or (Semaphores.Resource.Available /= 1) then
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Report.Failed ("Resource not properly released from task 2");
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Report.Failed ("Resource not properly released from task 2");
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end if;
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end if;
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Ptr3.all.Done; -- Task 3 releases resource and lock
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Ptr3.all.Done; -- Task 3 releases resource and lock
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-- All resources released
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-- All resources released
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-- All tasks terminated (or close)
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-- All tasks terminated (or close)
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-- Two resources available
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-- Two resources available
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if (Task_Pkg.Counter.Number /=0)
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if (Task_Pkg.Counter.Number /=0)
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or (Semaphores.Resource.Available /= 2) then
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or (Semaphores.Resource.Available /= 2) then
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Report.Failed ("Resource not properly released from task 3");
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Report.Failed ("Resource not properly released from task 3");
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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 C940002;
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end C940002;
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