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1 149 jeremybenn
-- C974002.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 the sequence of statements of the triggering alternative
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--      of an asynchronous select statement is executed if the triggering
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--      statement is a delay_until statement, and the specified time has
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--      already passed. Check that the abortable part is not executed after
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--      the sequence of statements of the triggering alternative is left.
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--
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--      Check that the sequence of statements of the triggering alternative
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--      of an asynchronous select statement is not executed if the abortable
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--      part completes before the triggering statement, and the triggering
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--      statement is a delay_until statement.
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--
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-- TEST DESCRIPTION:
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--      Declare a task with an accept statement containing an asynchronous
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--      select with a delay_until triggering statement. Parameterize
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--      the accept statement with the time to be used in the delay. Simulate
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--      a quick calculation by declaring a procedure which sets a Boolean
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--      flag. Call this procedure in the abortable part.
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--
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--      Make two calls to the task entry: (1) with a time that has already
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--      expired, and (2) with a time that will not expire before the quick
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--      calculation completes.
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--
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--      For (1), the sequence of statements following the triggering statement
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--      is executed, and the abortable part never starts.
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--
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--      For (2), the abortable part completes before the triggering statement,
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--      the delay is canceled, and the sequence of statements following the
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--      triggering statement never starts.
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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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--      26 Nov 95   SAIC    Bug fix for ACVC 2.0.1.
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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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with ImpDef;
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procedure C974002 is
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   function "-" (Left: Ada.Calendar.Time; Right: Duration )
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                          return Ada.Calendar.Time renames Ada.Calendar."-";
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   function "+" (Left: Ada.Calendar.Time; Right: Duration )
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                          return Ada.Calendar.Time renames Ada.Calendar."+";
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   Abortable_Part_Executed         : Boolean;
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   Triggering_Alternative_Executed : Boolean;
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          --========================================================--
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   procedure Quick_Calculation is
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   begin
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      if Report.Equal (1, 1) then
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         Abortable_Part_Executed := True;
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      end if;
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   end Quick_Calculation;
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          --========================================================--
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   task type Timed_Calculation_Task is
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      entry Calculation (Time_Out : in Ada.Calendar.Time);
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   end Timed_Calculation_Task;
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   task body Timed_Calculation_Task is
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   begin
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      loop
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         select
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            accept Calculation (Time_Out : in Ada.Calendar.Time) do
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               --                                    --
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               -- Asynchronous select is tested here --
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               --                                    --
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               select
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                  delay until Time_Out;                    -- Triggering
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                                                           -- statement.
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                  Triggering_Alternative_Executed := True; -- Triggering
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                                                           -- alternative.
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               then abort
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                  Quick_Calculation;                       -- Abortable part.
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               end select;
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            end Calculation;
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         or
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            terminate;
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         end select;
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      end loop;
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   exception
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      when others =>
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         Report.Failed ("Unexpected exception in Timed_Calculation_Task");
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   end Timed_Calculation_Task;
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          --========================================================--
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   Start_Time : constant Ada.Calendar.Time :=
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                         Ada.Calendar.Time_of (1901,1,1);
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   Minute     : constant Duration          := 60.0;
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          --========================================================--
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begin  -- Main program.
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   Report.Test ("C974002", "Asynchronous Select with Delay_Until");
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   -- take care of implementations that start the clock at 1/1/01
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   delay ImpDef.Delay_For_Time_Past;
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   Abortable_Part_Executed         := False;
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   Triggering_Alternative_Executed := False;
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   NO_DELAY_SUBTEST:
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      declare
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         -- Set Expiry to a time which has already passed
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         Expiry : constant Ada.Calendar.Time := Start_Time;
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         Timed  : Timed_Calculation_Task;
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      begin
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         -- Expiry is the time to be specified in the delay_until statement
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         -- of the asynchronous select. Since it has already passed, the
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         -- abortable part should not execute, and the sequence of statements
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         -- of the triggering alternative should be executed.
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         Timed.Calculation (Time_Out => Expiry);   -- Asynchronous select
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                                                   -- inside accept block.
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         if Abortable_Part_Executed then
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            Report.Failed ("No delay: Abortable part was executed");
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         end if;
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         if not Triggering_Alternative_Executed then
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            Report.Failed ("No delay: triggering alternative sequence " &
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                           "of statements was not executed");
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         end if;
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      end No_Delay_Subtest;
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   Abortable_Part_Executed         := False;
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   Triggering_Alternative_Executed := False;
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   LONG_DELAY_SUBTEST:
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      declare
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         -- Quick_Calculation should finish before expiry.
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         Expiry : constant Ada.Calendar.Time :=
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                                            Ada.Calendar.Clock + Minute;
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         Timed  : Timed_Calculation_Task;
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      begin
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         -- Expiry is the time to be specified in the delay_until statement
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         -- of the asynchronous select. It should not pass before the abortable
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         -- part completes, at which time control should return to the caller;
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         -- the sequence of statements of the triggering alternative should
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         -- not be executed.
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         Timed.Calculation (Time_Out => Expiry);  -- Asynchronous select.
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         if not Abortable_Part_Executed then
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            Report.Failed ("Long delay: Abortable part was not executed");
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         end if;
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         if Triggering_Alternative_Executed then
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            Report.Failed ("Long delay: triggering alternative sequence " &
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                           "of statements was executed");
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         end if;
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      end Long_Delay_Subtest;
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   Report.Result;
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end C974002;

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