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-- C954016.A

--

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--*

--

-- OBJECTIVE:

--      Check that when a task that is called by a requeue is aborted, the

--      original caller receives Tasking_Error and 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 the Main aborts it.  Check that Tasking_Error is raised in

--      the Original_Caller, that the Receiver does, indeed, get aborted and

--      the Intermediate task is undisturbed.

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

--      cause it to hang which would constitute failure.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      25 Nov 95   SAIC    Replaced shared global variable with protected

--                          object for ACVC 2.0.1

--

--!

with Report;

with ImpDef;

procedure C954016 is

   TC_Original_Caller_Complete  : Boolean := false;

   TC_Intermediate_Complete     : Boolean := false;

   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_Receiver_in_Accept        : Shared_Boolean (False);

   task Original_Caller is

      entry Start;

   end Original_Caller;

   task Intermediate is

      entry Input;

      entry TC_Abort_Process_Complete;

   end Intermediate;

   task Receiver is

      entry Input;

      entry TC_Never_Called;

   end Receiver;

   task body Original_Caller is

   begin

      accept Start;    -- wait for the trigger from Main

      Intermediate.Input;

      Report.Failed ("Tasking_Error not raised in Original_Caller task");

   exception

      when tasking_error =>

               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 abort housekeeping is finished

      accept TC_Abort_Process_Complete;

      TC_Intermediate_Complete := true;

   exception

      when others =>

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

   end Intermediate;

   task body Receiver is

   begin

      accept Input do

         TC_Receiver_in_Accept.Set_True;

         -- Hang within the accept body to allow Main to abort this task

         accept TC_Never_Called;

      end Input;

   exception

      when others  =>

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

   end Receiver;

begin

   Report.Test ("C954016", "Requeue: abort the called task");

   Original_Caller.Start;

   -- Wait till the rendezvous with Receiver is started

   while not TC_Receiver_in_Accept.Value loop

      delay ImpDef.Minimum_Task_Switch;

   end loop;

   -- At this point the Receiver is guaranteed to be in its accept

   --

   abort Receiver;

   -- Wait for the whole of the abort 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

   Intermediate.TC_Abort_Process_Complete;

   -- 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 ) then

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

   end if;

   Report.Result;

end C954016;