diff options
Diffstat (limited to 'gcc-4.9/gcc/testsuite/ada/acats/tests/c9/c954a03.a')
| -rw-r--r-- | gcc-4.9/gcc/testsuite/ada/acats/tests/c9/c954a03.a | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/ada/acats/tests/c9/c954a03.a b/gcc-4.9/gcc/testsuite/ada/acats/tests/c9/c954a03.a new file mode 100644 index 000000000..13d21311c --- /dev/null +++ b/gcc-4.9/gcc/testsuite/ada/acats/tests/c9/c954a03.a @@ -0,0 +1,322 @@ +-- C954A03.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 a requeue statement in an accept_statement with +-- parameters may requeue the entry call to a protected entry with no +-- parameters. Check that, if the call is queued on the new entry's +-- queue, the original caller remains blocked after the requeue, but +-- the accept_statement containing the requeue is completed. +-- +-- Note that this test uses a requeue "with abort," although it does not +-- check that such a requeued caller can be aborted; that feature is +-- tested elsewhere. +-- +-- 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). Verify that, following the requeue, +-- the requesting task remains blocked. Call the second entry of the +-- printer server task (the acceptance of this entry call verifies that +-- the requeue statement completed the entry call by the requesting task. +-- Call the second protected procedure of the protected type (the +-- interrupt handler) and verify that the protected entry completes for +-- the requesting task (which verifies that the requeue statement queued +-- the first task object to the protected entry). +-- +-- 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 C954A03_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 C954A03_0; + + + --==================================================================-- + + +with Report; +with ImpDef; + +with F954A00; -- Printer device abstraction. +use F954A00; +pragma Elaborate(F954a00); + +package body C954A03_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. + + -- Allow other tasks to get control + delay ImpDef.Minimum_Task_Switch; + + 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 + with abort; -- 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; + + end loop; + + exception + when others => + Report.Failed ("Exception raised in Printer_Server task"); + end Printer_Server; + + +end C954A03_0; + + + --==================================================================-- + + +with Report; +with ImpDef; + +with F954A00; -- Printer device abstraction. +with C954A03_0; -- Printer server abstraction. + +use C954A03_0; +use F954A00; + +procedure C954A03 is + + Long_Enough : constant Duration := ImpDef.Clear_Ready_Queue; + + + --==============================================-- + + Task_Completed : Boolean := False; -- Testing flag. + + protected Interlock is -- Artifice for test purposes. + entry Wait; -- Wait for lock to be released. + procedure Release; -- Release the lock. + private + Locked : Boolean := True; + end Interlock; + + + protected body Interlock is + + entry Wait when not Locked is -- Calls are queued until after + -- -- Release is called. + begin + Task_Completed := True; + end Wait; + + procedure Release is -- Called by Print_Request. + begin + Locked := False; + end Release; + + end Interlock; + + --==============================================-- + + task Print_Request is -- Send a print request. + end Print_Request; + + task body Print_Request is + My_File : constant String := "MYFILE.DAT"; + begin + Printer_Server.Print (My_File); -- Invoke requeue statement. + Interlock.Release; -- Allow main to continue. + exception + when others => + Report.Failed ("Exception raised in Print_Request task"); + end Print_Request; + + --==============================================-- + +begin -- Main program. + + Report.Test ("C954A03", "Requeue from an Accept with parameters" & + " to a Protected Entry without parameters"); + + -- To pass this test, the following must be true: + -- + -- (A) The Print entry call made by the task Print_Request must be + -- completed by the requeue statement. + -- (B) Print_Request must remain blocked following the requeue. + -- (C) Print_Request must be queued on the Done_Printing queue of + -- Printer(1). + -- (D) Print_Request must continue execution after Done_Printing is + -- complete. + -- + -- First, verify (A): that the Print entry call is complete. + -- + -- Call the entry Verify_Results. If the requeue statement completed the + -- entry call to Print, the entry call to Verify_Results should be + -- accepted. Since the main will hang if this is NOT the case, make this + -- a timed entry call. + + select + Printer_Server.Verify_Results; -- Accepted if requeue completed + -- entry call to Print. + or + delay Long_Enough; -- Time out otherwise. + Report.Failed ("Requeue did not complete entry call"); + end select; + + -- Now verify (B): that Print_Request remains blocked following the + -- requeue. Also verify that Done_Printing (the entry to which + -- Print_Request should have been queued) has not yet executed. + + if Printer(1).Is_Done then + Report.Failed ("Target entry of requeue executed prematurely"); + elsif Print_Request'Terminated then + Report.Failed ("Caller did not remain blocked after the requeue"); + else + + -- Verify (C): that Print_Request is queued on the + -- Done_Printing queue of Printer(1). + -- + -- Set the barrier for Printer(1).Done_Printing to true. Check + -- that the Done flag is updated and that Print_Request terminates. + + 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). + + if not Printer(1).Is_Done then + Report.Failed ("Caller was not requeued on target entry"); + end if; + + -- Finally, verify (D): that Print_Request continues after Done_Printing + -- completes. + -- + -- After Done_Printing completes, there is a potential race condition + -- between the main program and Print_Request. The protected object + -- Interlock is provided to ensure that the check of whether + -- Print_Request continued is made *after* it has had a chance to do so. + -- The main program waits until the statement in Print_Request following + -- the requeue-causing statement has executed, then checks to see + -- whether Print_Request did in fact continue executing. + -- + -- Note that the test will hang here if Print_Request does not continue + -- executing following the completion of the requeued entry call. + + Interlock.Wait; -- Wait until Print_Request is + -- done. + if not Task_Completed then + Report.Failed ("Caller remained blocked after target " & + "entry released"); + end if; + + -- Wait for Print_Request to finish before calling Report.Result. + while not Print_Request'Terminated loop + delay ImpDef.Minimum_Task_Switch; + end loop; + + end if; + + Report.Result; + +end C954A03; |