-- CB20007.A -- -- Grant of Unlimited Rights -- -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687 and -- F08630-91-C-0015, 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 can be directly propagated to -- the calling unit by 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 propagated directly from the protected -- operations to the calling unit. -- -- Ensure that the exceptions are raised and correctly propagated directly -- to the calling unit from protected procedures and functions. -- -- -- CHANGE HISTORY: -- 06 Dec 94 SAIC ACVC 2.0 -- --! package CB20007_0 is -- Package Semaphore. 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 CB20007_0; --=================================================================-- with Report; package body CB20007_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"); else Count := Count - 1; -- Available resources decremented. end if; -- No exception handlers here, direct propagation to calling unit. 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 ("Program control not transferred by raise"); else return (False); end if; -- No exception handlers here, direct propagation to calling unit. 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 an -- exception. Report.Failed("Resource limit exceeded"); end if; -- No exception handler here for exception raised in function. -- Exception will propagate directly to calling unit. end Release; end Counting_Semaphore; end CB20007_0; --=================================================================-- with CB20007_0; -- Package Semaphore. with Report; procedure CB20007 is begin Test_Block: declare package Semaphore renames CB20007_0; Total_Resources_Available : constant := 1; Resources : Semaphore.Counting_Semaphore (Total_Resources_Available); -- An object of protected type. begin Report.Test ("CB20007", "Check that exceptions are raised and can " & "be directly propagated to the calling unit " & "by protected operations" ); Allocate_Resources: declare Loop_Count : Integer := Total_Resources_Available + 1; begin -- Force exception. for I in 1..Loop_Count loop Resources.Secure; end loop; Report.Failed ("Exception not propagated from protected " & " operation in Allocate_Resources"); exception when Semaphore.Resource_Underflow => -- Exception prop. Semaphore.Handled_In_Procedure_Caller := True; -- from protected -- procedure. when others => Report.Failed ("Unknown exception during resource allocation"); end Allocate_Resources; Deallocate_Resources: declare Loop_Count : Integer := Total_Resources_Available + 1; begin -- Force exception. for I in 1..Loop_Count loop Resources.Release; end loop; Report.Failed ("Exception not propagated from protected " & "operation in Deallocate_Resources"); exception when Semaphore.Resource_Overflow => -- Exception prop Semaphore.Handled_In_Function_Caller := True; -- from protected -- function. when others => Report.Failed ("Exception raised during resource deallocation"); end Deallocate_Resources; if not (Semaphore.Handled_In_Procedure_Caller and -- Incorrect exception Semaphore.Handled_In_Function_Caller) -- handling in then -- protected ops. Report.Failed ("Improper exception propagation by protected operations"); end if; exception when others => Report.Failed ("Unexpected exception " & " raised and propagated in test"); end Test_Block; Report.Result; end CB20007;