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-- CB20006.A
--
-- Grant of Unlimited Rights
--
-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
-- unlimited rights in the software and documentation contained herein.
-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
-- this public release, the Government intends to confer upon all
-- recipients unlimited rights equal to those held by the Government.
-- These rights include rights to use, duplicate, release or disclose the
-- released technical data and computer software in whole or in part, in
-- any manner and for any purpose whatsoever, and to have or permit others
-- to do so.
--
-- DISCLAIMER
--
-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
-- PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- OBJECTIVE:
-- Check that exceptions are raised and properly handled (including
-- propagation by reraise) in protected operations.
--
-- TEST DESCRIPTION:
-- Declare a package with a protected type, including protected operation
-- declarations and private data, simulating a counting semaphore.
-- In the main procedure, perform calls on protected operations
-- of the protected object designed to induce the raising of exceptions.
--
-- The exceptions raised are to be initially handled in the protected
-- operations, but this handling involves the reraise of the exception
-- and the propagation of the exception to the caller.
--
-- Ensure that the exceptions are raised, handled / reraised successfully
-- in protected procedures and functions. Use "others" handlers in the
-- protected operations.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
package CB20006_0 is -- Package Semaphore.
Reraised_In_Function,
Reraised_In_Procedure,
Handled_In_Function_Caller,
Handled_In_Procedure_Caller : Boolean := False;
Resource_Overflow,
Resource_Underflow : exception;
protected type Counting_Semaphore (Max_Resources : Integer) is
procedure Secure;
function Resource_Limit_Exceeded return Boolean;
procedure Release;
private
Count : Integer := Max_Resources;
end Counting_Semaphore;
end CB20006_0;
--=================================================================--
with Report;
package body CB20006_0 is -- Package Semaphore.
protected body Counting_Semaphore is
procedure Secure is
begin
if (Count = 0) then -- No resources left to secure.
raise Resource_Underflow;
Report.Failed
("Program control not transferred by raise in Procedure Secure");
else
Count := Count - 1; -- Available resources decremented.
end if;
exception
when Resource_Underflow =>
Reraised_In_Procedure := True;
raise; -- Exception propagated to caller.
Report.Failed ("Exception not propagated to caller from Secure");
when others =>
Report.Failed ("Unexpected exception raised in Secure");
end Secure;
function Resource_Limit_Exceeded return Boolean is
begin
if (Count > Max_Resources) then
raise Resource_Overflow; -- Exception used as control flow
-- mechanism.
Report.Failed
("Specific raise did not alter program control" &
" from Resource_Limit_Exceeded");
else
return (False);
end if;
exception
when others =>
Reraised_In_Function := True;
raise; -- Exception propagated to caller.
Report.Failed ("Exception not propagated to caller" &
" from Resource_Limit_Exceeded");
end Resource_Limit_Exceeded;
procedure Release is
begin
Count := Count + 1; -- Count of resources available
-- incremented.
if Resource_Limit_Exceeded then -- Call to protected operation
Count := Count - 1; -- function that raises/reraises
-- an exception.
Report.Failed("Resource limit exceeded");
end if;
exception
when others =>
raise; -- Reraised and propagated again.
Report.Failed ("Exception not reraised by procedure Release");
end Release;
end Counting_Semaphore;
end CB20006_0;
--=================================================================--
with CB20006_0; -- Package Semaphore.
with Report;
procedure CB20006 is
begin
Report.Test ("CB20006", "Check that exceptions are raised and " &
"handled / reraised and propagated " &
"correctly by protected operations" );
Test_Block:
declare
package Semaphore renames CB20006_0;
Total_Resources_Available : constant := 1;
Resources : Semaphore.Counting_Semaphore (Total_Resources_Available);
-- An object of protected type.
begin
Allocate_Resources:
declare
Loop_Count : Integer := Total_Resources_Available + 1;
begin
for I in 1..Loop_Count loop -- Force exception
Resources.Secure;
end loop;
Report.Failed
("Exception not propagated from protected operation Secure");
exception
when Semaphore.Resource_Underflow => -- Exception propagated
Semaphore.Handled_In_Procedure_Caller := True; -- from protected
when others => -- procedure.
Semaphore.Handled_In_Procedure_Caller := False;
end Allocate_Resources;
Deallocate_Resources:
declare
Loop_Count : Integer := Total_Resources_Available + 1;
begin
for I in 1..Loop_Count loop -- Force exception
Resources.Release;
end loop;
Report.Failed
("Exception not propagated from protected operation Release");
exception
when Semaphore.Resource_Overflow => -- Exception propagated
Semaphore.Handled_In_Function_Caller := True; -- from protected
when others => -- function.
Semaphore.Handled_In_Function_Caller := False;
end Deallocate_Resources;
if not (Semaphore.Reraised_In_Procedure and
Semaphore.Reraised_In_Function and
Semaphore.Handled_In_Procedure_Caller and
Semaphore.Handled_In_Function_Caller)
then -- Incorrect excpt. handling
Report.Failed -- in protected operations.
("Improper exception handling/reraising by protected operations");
end if;
exception
when others =>
Report.Failed ("Unexpected exception " &
" raised and propagated in test");
end Test_Block;
Report.Result;
end CB20006;
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