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-- C954017.A

--

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--*

--

-- OBJECTIVE:

--      Check that when an exception is raised in the rendezvous of a task

--      that was called by a requeue the exception is propagated to the

--      original caller and that the requeuing task is unaffected.

--

-- TEST DESCRIPTION:

--      The Intermediate task requeues a call from the Original_Caller to the

--      Receiver.  While the Receiver is in the accept body for this

--      rendezvous a Constraint_Error exception is raised.  Check that the

--      exception is propagated to the Original_Caller, that the Receiver's

--      normal exception logic is employed and that the Intermediate task

--      is undisturbed.

--      There are several delay loops in this test any one of which could

--      cause it to hang (and thus fail).

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      25 Nov 95   SAIC    Fixed shared global variable problem for

--                          ACVC 2.0.1

--

--!

with Report;

with ImpDef;

procedure C954017 is

   TC_Original_Caller_Complete   : Boolean := false;

   TC_Intermediate_Complete      : Boolean := false;

   TC_Receiver_Complete          : Boolean := false;

   TC_Exception                  : Exception;

   protected type Shared_Boolean (Initial_Value : Boolean := False) is

      procedure Set_True;

      procedure Set_False;

      function  Value return Boolean;

   private

      Current_Value : Boolean := Initial_Value;

   end Shared_Boolean;

   protected body Shared_Boolean is

      procedure Set_True is

      begin

         Current_Value := True;

      end Set_True;

      procedure Set_False is

      begin

         Current_Value := False;

      end Set_False;

      function Value return Boolean is

      begin

         return Current_Value;

      end Value;

   end Shared_Boolean;

   TC_Exception_Process_Complete : Shared_Boolean (False);

   task Original_Caller is

      entry Start;

   end Original_Caller;

   task Intermediate is

      entry Input;

   end Intermediate;

   task Receiver is

      entry Input;

   end Receiver;

   task body Original_Caller is

   begin

      accept Start;    -- wait for the trigger from Main

      Intermediate.Input;

      Report.Failed ("Exception not propagated to Original_Caller");

   exception

      when TC_Exception =>

               TC_Original_Caller_Complete := true;     -- Expected behavior

      when others        =>

               Report.Failed ("Unexpected Exception in Original_Caller task");

   end Original_Caller;

   task body Intermediate is

   begin

      accept Input do

         -- Within this accept call another task

         requeue Receiver.Input with abort;

      end Input;

      -- Wait for Main to ensure that the exception housekeeping is finished

      while not TC_Exception_Process_Complete.Value loop

         delay ImpDef.Minimum_Task_Switch;

      end loop;

      TC_Intermediate_Complete := true;

   exception

      when others =>

                  Report.Failed ("Unexpected exception in Intermediate task");

   end Intermediate;

   task body Receiver is

   --

   begin

      accept Input do

         null;  -- the user code for the rendezvous is stubbed out

         -- Test Control: Raise an exception in the destination task which

         -- should then be propagated

         raise TC_Exception;

      end Input;

   exception

      when TC_Exception =>

            TC_Receiver_Complete := true;  -- expected behavior

      when others        =>

            Report.Failed ("Unexpected Exception in Receiver Task");

   end Receiver;

begin

   Report.Test ("C954017", "Requeue: exception processing");

   Original_Caller.Start;   -- Start the test after the Report.Test

   -- Wait for the whole of the exception process to complete

   while not ( Original_Caller'terminated and Receiver'terminated ) loop

      delay ImpDef.Minimum_Task_Switch;

   end loop;

   -- Inform the Intermediate task that the process is complete to allow

   -- it to continue to completion itself

   TC_Exception_Process_Complete.Set_True;

   -- Wait for everything to settle before reporting the result

   while not ( Intermediate'terminated ) loop

      delay ImpDef.Minimum_Task_Switch;

   end loop;

   if not ( TC_Original_Caller_Complete and

            TC_Intermediate_Complete    and

            TC_Receiver_Complete)       then

      Report.Failed ("Proper paths not traversed");

   end if;

   Report.Result;

end C954017;