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1 149 jeremybenn
-- C974014.A
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--
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--                             Grant of Unlimited Rights
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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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--     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 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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--     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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--     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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--     to do so.
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--
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--                                    DISCLAIMER
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--
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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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--     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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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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--     PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- OBJECTIVE:
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--      Check that if the triggering alternative of an asynchronous select
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--      statement is a delay and the abortable part completes before the delay
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--      expires then the delay is cancelled and the optional statements in the
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--      triggering part are not performed.  In particular, check the case of
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--      the ATC in non-tasking code.
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--
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-- TEST DESCRIPTION:
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--      A fraction of in-line code is simulated.  An asynchronous select
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--      is used with a triggering delay of several minutes.  The abortable
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--      part, which is simulating a very lengthy, time consuming procedure
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--      actually returns almost immediately thus ensuring that it completes
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--      first.  At the conclusion, if a substantial amount of time has passed
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--      the delay is assumed not to have been cancelled.
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--      (based on example in LRM 9.7.4)
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--
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--
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-- CHANGE HISTORY:
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--      06 Dec 94   SAIC    ACVC 2.0
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--
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--!
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with Report;
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with Ada.Calendar;
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procedure C974014 is
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   function "-" (Left, Right : Ada.Calendar.Time)
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                              return Duration      renames Ada.Calendar."-";
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   TC_Start_Time      : Ada.Calendar.Time := Ada.Calendar.Clock;
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   TC_Elapsed_Time    : duration;
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   Maximum_Allowable_Time : duration := 300.0; -- for Calculate_Gamma_Function
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begin
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   Report.Test ("C974014", "ATC: When abortable part completes before " &
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                             "a triggering delay, check that the delay " &
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                             "is cancelled & optional statements " &
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                             "are not performed");
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   declare  -- encapsulate test code
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      type Gamma_Index is digits 5;   -- float precision
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      -- (These two fields are assumed filled elsewhere)
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      Input_Field, Result_of_Beta : Gamma_Index;
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      -- Notify and take corrective action in the event that
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      -- the procedure Calculate_Gamma_Function does not converge.
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      --
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      procedure Non_Convergent is
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      begin
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         null;  -- stub
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         Report.Failed ("Optional statements in triggering part" &
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                                    " were performed");
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      end Non_Convergent;
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      --  This is a very time consuming calculation.  It is possible,
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      --  that, with certain parameters, it will not converge.  If it
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      --  runs for more than Maximum_Allowable_Time it is considered
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      --  not to be convergent and should be aborted.
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      --
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      Procedure Calculate_Gamma_Function (X, Y : Gamma_Index) is
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      begin
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         null;  -- Stub
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         --
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      end Calculate_Gamma_Function;
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   begin  -- declare
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      -- .....  Isolated segment of inline code
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      -- Now Print Gamma Function (abort and display if not convergent)
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      --
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      select
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         delay Maximum_Allowable_Time;  -- for Calculate_Gamma_Function
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         Non_Convergent;   -- Display error and flag result as failed
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      then abort
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         Calculate_Gamma_Function (Input_Field, Result_of_Beta);
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      end select;
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      -- .....  End of Isolated segment of inline code
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   end; -- declare
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   TC_Elapsed_Time := Ada.Calendar.Clock - TC_Start_Time;
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   -- Note: We are not checking for "cancellation within a reasonable time",
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   -- we are checking for cancellation/non-cancellation of the delay.  We
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   -- use a number which, if exceeded, means that the delay was not
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   -- cancelled and has proceeded to  full term.
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   --
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   if ( TC_Elapsed_Time > Maximum_Allowable_Time/2 ) then
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      -- Test time exceeds a reasonable value.
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      Report.Failed ("Triggering delay statement was not cancelled");
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   end if;
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   Report.Result;
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end C974014;

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