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+-- C954A01.A
+--
+-- Grant of Unlimited Rights
+--
+-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
+-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
+-- unlimited rights in the software and documentation contained herein.
+-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
+-- this public release, the Government intends to confer upon all
+-- recipients unlimited rights equal to those held by the Government.
+-- These rights include rights to use, duplicate, release or disclose the
+-- released technical data and computer software in whole or in part, in
+-- any manner and for any purpose whatsoever, and to have or permit others
+-- to do so.
+--
+-- DISCLAIMER
+--
+-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
+-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
+-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
+-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
+-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
+-- PARTICULAR PURPOSE OF SAID MATERIAL.
+--*
+--
+-- OBJECTIVE:
+-- Check that if a task requeued without abort on a protected entry queue
+-- is aborted, the abort is deferred until the entry call completes,
+-- after which the task becomes completed.
+--
+-- TEST DESCRIPTION:
+-- Declare a protected type which simulates a printer device driver
+-- (foundation code).
+--
+-- Declare a task which simulates a printer server for multiple printers.
+--
+-- For the protected type, declare an entry with a barrier that is set
+-- false by a protected procedure (which simulates starting a print job
+-- on the printer), and is set true by a second protected procedure (which
+-- simulates a handler called when the printer interrupts, indicating
+-- that printing is done).
+--
+-- For the task, declare an entry whose corresponding accept statement
+-- contains a call to first protected procedure of the protected type
+-- (which sets the barrier of the protected entry to false), followed by
+-- a requeue with abort to the protected entry. Declare a second entry
+-- which does nothing.
+--
+-- Declare a "requesting" task which calls the printer server task entry
+-- (and thus executes the requeue). Attempt to abort the requesting
+-- task. Verify that it is not aborted. Call the second protected
+-- procedure of the protected type (the interrupt handler) and verify that
+-- the protected entry completes for the requesting task. Verify that
+-- the requesting task is then aborted.
+--
+-- TEST FILES:
+-- This test depends on the following foundation code:
+--
+-- F954A00.A
+--
+--
+-- CHANGE HISTORY:
+-- 06 Dec 94 SAIC ACVC 2.0
+-- 10 Oct 96 SAIC Added pragma elaborate.
+--
+--!
+
+package C954A01_0 is -- Printer server abstraction.
+
+ -- Simulate a system with multiple printers. The entry Print requests
+ -- that data be printed on the next available printer. The entry call
+ -- is accepted when a printer is available, and completes when printing
+ -- is done.
+
+
+ task Printer_Server is
+ entry Print (File_Name : String); -- Test the requeue statement.
+ entry Verify_Results; -- Artifice for test purposes.
+ end Printer_Server;
+
+end C954A01_0;
+
+
+ --==================================================================--
+
+
+with Report;
+with ImpDef;
+
+with F954A00; -- Printer device abstraction.
+use F954A00;
+pragma Elaborate(F954A00);
+
+package body C954A01_0 is -- Printer server abstraction.
+
+ task body Printer_Server is
+ Printers_Busy : Boolean := True;
+ Index : Printer_ID := 1;
+ Print_Accepted : Boolean := False;
+ begin
+
+ loop
+ -- Wait for a printer to become available:
+
+ while Printers_Busy loop
+ Printers_Busy := False; -- Exit loop if
+ -- entry accepted.
+ select
+ Printer(Index).Done_Printing; -- Accepted immed.
+ -- when printer is
+ -- available.
+ else
+ Index := 1 + (Index mod Number_Of_Printers);-- Entry not immed.
+ Printers_Busy := True; -- accepted; keep
+ end select; -- looping.
+ end loop;
+ -- Value of Index
+ -- at loop exit
+ -- identifies the
+ -- avail. printer.
+
+ -- Wait for a print request or terminate:
+
+ select
+ accept Print (File_Name : String) do
+ Print_Accepted := True; -- Allow
+ -- Verify_Results
+ -- to be accepted.
+
+ Printer(Index).Start_Printing (File_Name); -- Begin printing on
+ -- the available
+ -- -- -- printer.
+ -- Requeue is tested here --
+ -- --
+ -- Requeue caller so
+ requeue Printer(Index).Done_Printing; -- server task free
+ -- to accept other
+ end Print; -- requests.
+ or
+ -- Guard ensures that Verify_Results cannot be accepted
+ -- until after Print has been accepted. This avoids a
+ -- race condition in the main program.
+
+ when Print_Accepted => accept Verify_Results; -- Artifice for
+ -- testing purposes.
+ or
+ terminate;
+ end select;
+
+ -- Allow other tasks to get control
+ delay ImpDef.Long_Minimum_Task_Switch;
+
+ end loop;
+
+ exception
+ when others =>
+ Report.Failed ("Exception raised in Printer_Server task");
+ end Printer_Server;
+
+
+end C954A01_0;
+
+
+ --==================================================================--
+
+
+with Report;
+with ImpDef;
+
+with F954A00; -- Printer device abstraction.
+with C954A01_0; -- Printer server abstraction.
+
+use C954A01_0;
+use F954A00;
+
+procedure C954A01 is
+
+ Long_Enough : constant Duration := ImpDef.Long_Switch_To_New_Task;
+
+ --==============================================--
+
+ task Print_Request; -- Send a print request.
+
+ task body Print_Request is
+ My_File : constant String := "MYFILE.DAT";
+ begin
+ Printer_Server.Print (My_File); -- Invoke requeue statement.
+ Report.Failed ("Task continued execution following entry call");
+ exception
+ when others =>
+ Report.Failed ("Exception raised in Print_Request task");
+ end Print_Request;
+
+ --==============================================--
+
+begin -- Main program.
+
+ Report.Test ("C954A01", "Requeue without abort - check that the abort " &
+ "is deferred until after the rendezvous completes. (Task to PO)");
+
+ -- To pass this test, the following must be true:
+ --
+ -- (A) The abort of Print_Request is deferred until after the
+ -- Done_Printing entry body completes.
+ -- (B) Print_Request aborts after the Done_Printing entry call
+ -- completes.
+ --
+ -- Call the entry Verify_Results. The entry call will not be accepted
+ -- until after Print_Request has been requeued to Done_Printing.
+
+ Printer_Server.Verify_Results; -- Accepted after Print_Request is
+ -- requeued to Done_Printing.
+
+ -- Simulate an application which needs access to the printer within
+ -- a specified time, and which aborts the current printer job if time
+ -- runs out.
+
+ select
+ Printer(1).Done_Printing; -- Wait for printer to come free.
+ or
+ delay Long_Enough; -- Print job took too long.
+ abort Print_Request; -- Abort print job.
+ end select;
+
+ Printer_Server.Verify_Results; -- Abortion completion point: force
+ -- abort to complete (if it's going
+ -- to).
+
+ -- Verify that the Done_Printing entry body has not yet completed,
+ -- and thus that Print_Request has not been aborted.
+
+ if Printer(1).Is_Done then
+ Report.Failed ("Target entry of requeue executed prematurely");
+ elsif Print_Request'Terminated then
+ Report.Failed ("Caller was aborted before entry was complete");
+ else
+
+ Printer(1).Handle_Interrupt; -- Simulate a printer interrupt,
+ -- signaling that printing is
+ -- done.
+
+ -- The Done_Printing entry body will complete before the next protected
+ -- action is called (Printer(1).Is_Done). Verify (A) and (B): that the
+ -- Print_Request is aborted.
+
+ Printer_Server.Verify_Results; -- Abortion completion point: force
+ -- Print_Request abort to complete.
+
+ if not Printer(1).Is_Done then
+ Report.Failed ("Target entry of requeue did not complete");
+ end if;
+
+ if not Print_Request'Terminated then
+ Report.Failed ("Task not aborted following completion of entry call");
+ abort Print_Request; -- Try to kill hung task.
+ end if;
+
+ end if;
+
+ Report.Result;
+
+end C954A01;