-- CB20007.A
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-- CB20007.A
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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 exceptions are raised and can be directly propagated to
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-- Check that exceptions are raised and can be directly propagated to
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-- the calling unit by protected operations.
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-- the calling unit by protected operations.
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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 package with a protected type, including protected operation
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-- Declare a package with a protected type, including protected operation
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-- declarations and private data, simulating a counting semaphore.
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-- declarations and private data, simulating a counting semaphore.
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-- In the main procedure, perform calls on protected operations
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-- In the main procedure, perform calls on protected operations
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-- of the protected object designed to induce the raising of exceptions.
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-- of the protected object designed to induce the raising of exceptions.
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--
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--
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-- The exceptions raised are to be propagated directly from the protected
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-- The exceptions raised are to be propagated directly from the protected
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-- operations to the calling unit.
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-- operations to the calling unit.
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--
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--
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-- Ensure that the exceptions are raised and correctly propagated directly
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-- Ensure that the exceptions are raised and correctly propagated directly
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-- to the calling unit from protected procedures and functions.
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-- to the calling unit from protected procedures and functions.
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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 CB20007_0 is -- Package Semaphore.
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package CB20007_0 is -- Package Semaphore.
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Handled_In_Function_Caller,
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Handled_In_Function_Caller,
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Handled_In_Procedure_Caller : Boolean := False;
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Handled_In_Procedure_Caller : Boolean := False;
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Resource_Overflow,
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Resource_Overflow,
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Resource_Underflow : exception;
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Resource_Underflow : exception;
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protected type Counting_Semaphore (Max_Resources : Integer) is
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protected type Counting_Semaphore (Max_Resources : Integer) is
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procedure Secure;
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procedure Secure;
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function Resource_Limit_Exceeded return Boolean;
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function Resource_Limit_Exceeded return Boolean;
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procedure Release;
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procedure Release;
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private
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private
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Count : Integer := Max_Resources;
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Count : Integer := Max_Resources;
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end Counting_Semaphore;
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end Counting_Semaphore;
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end CB20007_0;
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end CB20007_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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package body CB20007_0 is -- Package Semaphore.
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package body CB20007_0 is -- Package Semaphore.
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protected body Counting_Semaphore is
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protected body Counting_Semaphore is
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procedure Secure is
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procedure Secure is
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begin
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begin
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if (Count = 0) then -- No resources left to secure.
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if (Count = 0) then -- No resources left to secure.
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raise Resource_Underflow;
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raise Resource_Underflow;
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Report.Failed ("Program control not transferred by raise");
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Report.Failed ("Program control not transferred by raise");
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else
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else
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Count := Count - 1; -- Available resources decremented.
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Count := Count - 1; -- Available resources decremented.
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end if;
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end if;
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-- No exception handlers here, direct propagation to calling unit.
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-- No exception handlers here, direct propagation to calling unit.
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end Secure;
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end Secure;
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function Resource_Limit_Exceeded return Boolean is
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function Resource_Limit_Exceeded return Boolean is
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begin
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begin
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if (Count > Max_Resources) then
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if (Count > Max_Resources) then
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raise Resource_Overflow; -- Exception used as control flow
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raise Resource_Overflow; -- Exception used as control flow
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-- mechanism.
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-- mechanism.
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Report.Failed ("Program control not transferred by raise");
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Report.Failed ("Program control not transferred by raise");
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else
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else
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return (False);
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return (False);
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end if;
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end if;
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-- No exception handlers here, direct propagation to calling unit.
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-- No exception handlers here, direct propagation to calling unit.
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end Resource_Limit_Exceeded;
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end Resource_Limit_Exceeded;
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procedure Release is
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procedure Release is
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begin
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begin
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Count := Count + 1; -- Count of resources available
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Count := Count + 1; -- Count of resources available
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-- incremented.
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-- incremented.
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if Resource_Limit_Exceeded then -- Call to protected operation
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if Resource_Limit_Exceeded then -- Call to protected operation
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Count := Count - 1; -- function that raises an
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Count := Count - 1; -- function that raises an
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-- exception.
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-- exception.
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Report.Failed("Resource limit exceeded");
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Report.Failed("Resource limit exceeded");
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end if;
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end if;
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-- No exception handler here for exception raised in function.
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-- No exception handler here for exception raised in function.
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-- Exception will propagate directly to calling unit.
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-- Exception will propagate directly to calling unit.
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end Release;
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end Release;
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end Counting_Semaphore;
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end Counting_Semaphore;
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end CB20007_0;
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end CB20007_0;
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--=================================================================--
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--=================================================================--
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with CB20007_0; -- Package Semaphore.
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with CB20007_0; -- Package Semaphore.
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with Report;
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with Report;
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procedure CB20007 is
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procedure CB20007 is
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begin
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begin
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Test_Block:
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Test_Block:
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declare
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declare
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package Semaphore renames CB20007_0;
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package Semaphore renames CB20007_0;
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Total_Resources_Available : constant := 1;
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Total_Resources_Available : constant := 1;
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Resources : Semaphore.Counting_Semaphore (Total_Resources_Available);
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Resources : Semaphore.Counting_Semaphore (Total_Resources_Available);
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-- An object of protected type.
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-- An object of protected type.
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begin
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begin
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Report.Test ("CB20007", "Check that exceptions are raised and can " &
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Report.Test ("CB20007", "Check that exceptions are raised and can " &
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"be directly propagated to the calling unit " &
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"be directly propagated to the calling unit " &
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"by protected operations" );
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"by protected operations" );
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Allocate_Resources:
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Allocate_Resources:
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declare
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declare
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Loop_Count : Integer := Total_Resources_Available + 1;
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Loop_Count : Integer := Total_Resources_Available + 1;
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begin -- Force exception.
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begin -- Force exception.
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for I in 1..Loop_Count loop
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for I in 1..Loop_Count loop
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Resources.Secure;
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Resources.Secure;
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end loop;
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end loop;
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Report.Failed ("Exception not propagated from protected " &
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Report.Failed ("Exception not propagated from protected " &
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" operation in Allocate_Resources");
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" operation in Allocate_Resources");
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exception
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exception
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when Semaphore.Resource_Underflow => -- Exception prop.
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when Semaphore.Resource_Underflow => -- Exception prop.
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Semaphore.Handled_In_Procedure_Caller := True; -- from protected
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Semaphore.Handled_In_Procedure_Caller := True; -- from protected
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-- procedure.
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-- procedure.
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when others =>
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when others =>
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Report.Failed ("Unknown exception during resource allocation");
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Report.Failed ("Unknown exception during resource allocation");
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end Allocate_Resources;
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end Allocate_Resources;
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Deallocate_Resources:
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Deallocate_Resources:
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declare
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declare
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Loop_Count : Integer := Total_Resources_Available + 1;
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Loop_Count : Integer := Total_Resources_Available + 1;
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begin -- Force exception.
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begin -- Force exception.
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for I in 1..Loop_Count loop
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for I in 1..Loop_Count loop
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Resources.Release;
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Resources.Release;
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end loop;
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end loop;
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Report.Failed ("Exception not propagated from protected " &
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Report.Failed ("Exception not propagated from protected " &
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"operation in Deallocate_Resources");
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"operation in Deallocate_Resources");
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exception
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exception
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when Semaphore.Resource_Overflow => -- Exception prop
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when Semaphore.Resource_Overflow => -- Exception prop
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Semaphore.Handled_In_Function_Caller := True; -- from protected
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Semaphore.Handled_In_Function_Caller := True; -- from protected
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-- function.
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-- function.
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when others =>
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when others =>
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Report.Failed ("Exception raised during resource deallocation");
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Report.Failed ("Exception raised during resource deallocation");
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end Deallocate_Resources;
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end Deallocate_Resources;
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if not (Semaphore.Handled_In_Procedure_Caller and -- Incorrect exception
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if not (Semaphore.Handled_In_Procedure_Caller and -- Incorrect exception
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Semaphore.Handled_In_Function_Caller) -- handling in
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Semaphore.Handled_In_Function_Caller) -- handling in
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then -- protected ops.
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then -- protected ops.
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Report.Failed
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Report.Failed
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("Improper exception propagation by protected operations");
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("Improper exception propagation by protected operations");
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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 =>
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when others =>
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Report.Failed ("Unexpected exception " &
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Report.Failed ("Unexpected exception " &
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" raised and propagated in test");
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" raised and propagated in test");
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end Test_Block;
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end Test_Block;
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Report.Result;
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Report.Result;
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end CB20007;
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end CB20007;
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