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Diffstat (limited to 'gcc/ada/s-taspri-os2.ads')
| -rw-r--r-- | gcc/ada/s-taspri-os2.ads | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/gcc/ada/s-taspri-os2.ads b/gcc/ada/s-taspri-os2.ads new file mode 100644 index 00000000000..cb5b0295b13 --- /dev/null +++ b/gcc/ada/s-taspri-os2.ads @@ -0,0 +1,107 @@ +------------------------------------------------------------------------------ +-- -- +-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- S Y S T E M . T A S K _ P R I M I T I V E S -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1991-1994, Florida State University -- +-- Copyright (C) 1995-2003, Ada Core Technologies -- +-- -- +-- GNARL is free software; you can redistribute it and/or modify it under -- +-- terms of the GNU General Public License as published by the Free Soft- -- +-- ware Foundation; either version 2, or (at your option) any later ver- -- +-- sion. GNARL is distributed in the hope that it will be useful, but WITH- -- +-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- +-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- +-- for more details. You should have received a copy of the GNU General -- +-- Public License distributed with GNARL; see file COPYING. If not, write -- +-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- +-- MA 02111-1307, USA. -- +-- -- +-- As a special exception, if other files instantiate generics from this -- +-- unit, or you link this unit with other files to produce an executable, -- +-- this unit does not by itself cause the resulting executable to be -- +-- covered by the GNU General Public License. This exception does not -- +-- however invalidate any other reasons why the executable file might be -- +-- covered by the GNU Public License. -- +-- -- +-- GNARL was developed by the GNARL team at Florida State University. -- +-- Extensive contributions were provided by Ada Core Technologies, Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This is an OS/2 version of this package. + +-- This package provides low-level support for most tasking features. + +pragma Polling (Off); +-- Turn off polling, we do not want ATC polling to take place during +-- tasking operations. It causes infinite loops and other problems. + +with Interfaces.OS2Lib.Threads; +with Interfaces.OS2Lib.Synchronization; + +package System.Task_Primitives is + + pragma Preelaborate; + +-- type Lock is limited private; + -- Should be used for implementation of protected objects. + +-- type RTS_Lock is limited private; + -- Should be used inside the runtime system. + -- The difference between Lock and the RTS_Lock is that the later + -- one serves only as a semaphore so that do not check for + -- ceiling violations. + + type Task_Body_Access is access procedure; + -- Pointer to the task body's entry point (or possibly a wrapper + -- declared local to the GNARL). + +-- type Private_Data is limited private; + -- Any information that the GNULLI needs maintained on a per-task + -- basis. A component of this type is guaranteed to be included + -- in the Ada_Task_Control_Block. + +-- private + + type Lock is record + Mutex : aliased Interfaces.OS2Lib.Synchronization.HMTX; + Priority : Integer; + Owner_Priority : Integer; + Owner_ID : Address; + end record; + + type RTS_Lock is new Lock; + + type Private_Data is record + Thread : aliased Interfaces.OS2Lib.Threads.TID; + pragma Atomic (Thread); + -- Thread field may be updated by two different threads of control. + -- (See, Enter_Task and Create_Task in s-taprop.adb). + -- They put the same value (thr_self value). We do not want to + -- use lock on those operations and the only thing we have to + -- make sure is that they are updated in atomic fashion. + + CV : aliased Interfaces.OS2Lib.Synchronization.HEV; + + L : aliased RTS_Lock; + -- Protection for all components is lock L + + Current_Priority : Integer := -1; + -- The Current_Priority is the actual priority of a thread. + -- This field is needed because it is only possible to set a + -- delta priority in OS/2. The only places where this field should + -- be set are Set_Priority, Create_Task and Initialize (Environment). + + Wrapper : Interfaces.OS2Lib.Threads.PFNTHREAD; + -- This is the original wrapper passed by Operations.Create_Task. + -- When installing an exception handler in a thread, the thread + -- starts executing the Exception_Wrapper which calls Wrapper + -- when the handler has been installed. The handler is removed when + -- wrapper returns. + end record; + +end System.Task_Primitives; |