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-- C974002.A

--

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--*

--

-- OBJECTIVE:

--      Check that the sequence of statements of the triggering alternative

--      of an asynchronous select statement is executed if the triggering

--      statement is a delay_until statement, and the specified time has

--      already passed. Check that the abortable part is not executed after

--      the sequence of statements of the triggering alternative is left.

--

--      Check that the sequence of statements of the triggering alternative

--      of an asynchronous select statement is not executed if the abortable

--      part completes before the triggering statement, and the triggering

--      statement is a delay_until statement.

--

-- TEST DESCRIPTION:

--      Declare a task with an accept statement containing an asynchronous

--      select with a delay_until triggering statement. Parameterize

--      the accept statement with the time to be used in the delay. Simulate

--      a quick calculation by declaring a procedure which sets a Boolean

--      flag. Call this procedure in the abortable part.

--

--      Make two calls to the task entry: (1) with a time that has already

--      expired, and (2) with a time that will not expire before the quick

--      calculation completes.

--

--      For (1), the sequence of statements following the triggering statement

--      is executed, and the abortable part never starts.

--

--      For (2), the abortable part completes before the triggering statement,

--      the delay is canceled, and the sequence of statements following the

--      triggering statement never starts.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      26 Nov 95   SAIC    Bug fix for ACVC 2.0.1.

--

--!

with Report;

with Ada.Calendar;

with ImpDef;

procedure C974002 is

   function "-" (Left: Ada.Calendar.Time; Right: Duration )

                          return Ada.Calendar.Time renames Ada.Calendar."-";

   function "+" (Left: Ada.Calendar.Time; Right: Duration )

                          return Ada.Calendar.Time renames Ada.Calendar."+";

   Abortable_Part_Executed         : Boolean;

   Triggering_Alternative_Executed : Boolean;

          --========================================================--

   procedure Quick_Calculation is

   begin

      if Report.Equal (1, 1) then

         Abortable_Part_Executed := True;

      end if;

   end Quick_Calculation;

          --========================================================--

   task type Timed_Calculation_Task is

      entry Calculation (Time_Out : in Ada.Calendar.Time);

   end Timed_Calculation_Task;

   task body Timed_Calculation_Task is

   begin

      loop

         select

            accept Calculation (Time_Out : in Ada.Calendar.Time) do

               --                                    --

               -- Asynchronous select is tested here --

               --                                    --

               select

                  delay until Time_Out;                    -- Triggering

                                                           -- statement.

                  Triggering_Alternative_Executed := True; -- Triggering

                                                           -- alternative.

               then abort

                  Quick_Calculation;                       -- Abortable part.

               end select;

            end Calculation;

         or

            terminate;

         end select;

      end loop;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Timed_Calculation_Task");

   end Timed_Calculation_Task;

          --========================================================--

   Start_Time : constant Ada.Calendar.Time :=

                         Ada.Calendar.Time_of (1901,1,1);

   Minute     : constant Duration          := 60.0;

          --========================================================--

begin  -- Main program.

   Report.Test ("C974002", "Asynchronous Select with Delay_Until");

   -- take care of implementations that start the clock at 1/1/01

   delay ImpDef.Delay_For_Time_Past;

   Abortable_Part_Executed         := False;

   Triggering_Alternative_Executed := False;

   NO_DELAY_SUBTEST:

      declare

         -- Set Expiry to a time which has already passed

         Expiry : constant Ada.Calendar.Time := Start_Time;

         Timed  : Timed_Calculation_Task;

      begin

         -- Expiry is the time to be specified in the delay_until statement

         -- of the asynchronous select. Since it has already passed, the

         -- abortable part should not execute, and the sequence of statements

         -- of the triggering alternative should be executed.

         Timed.Calculation (Time_Out => Expiry);   -- Asynchronous select

                                                   -- inside accept block.

         if Abortable_Part_Executed then

            Report.Failed ("No delay: Abortable part was executed");

         end if;

         if not Triggering_Alternative_Executed then

            Report.Failed ("No delay: triggering alternative sequence " &

                           "of statements was not executed");

         end if;

      end No_Delay_Subtest;

   Abortable_Part_Executed         := False;

   Triggering_Alternative_Executed := False;

   LONG_DELAY_SUBTEST:

      declare

         -- Quick_Calculation should finish before expiry.

         Expiry : constant Ada.Calendar.Time :=

                                            Ada.Calendar.Clock + Minute;

         Timed  : Timed_Calculation_Task;

      begin

         -- Expiry is the time to be specified in the delay_until statement

         -- of the asynchronous select. It should not pass before the abortable

         -- part completes, at which time control should return to the caller;

         -- the sequence of statements of the triggering alternative should

         -- not be executed.

         Timed.Calculation (Time_Out => Expiry);  -- Asynchronous select.

         if not Abortable_Part_Executed then

            Report.Failed ("Long delay: Abortable part was not executed");

         end if;

         if Triggering_Alternative_Executed then

            Report.Failed ("Long delay: triggering alternative sequence " &

                           "of statements was executed");

         end if;

      end Long_Delay_Subtest;

   Report.Result;

end C974002;