------------------------------------------------------------------------------ -- -- -- GNAT 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) 2001-2014, Free Software Foundation, Inc. -- -- -- -- GNAT 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 3, or (at your option) any later ver- -- -- sion. GNAT 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. -- -- -- -- -- -- -- -- -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNARL was developed by the GNARL team at Florida State University. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ -- This is the version of this package for Ravenscar bare board targets 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 System.OS_Interface; package System.Task_Primitives is pragma Preelaborate; 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. subtype Task_Address is System.Address; Task_Address_Size : constant := Standard'Address_Size; -- Type used for task addresses and its size Alternate_Stack_Size : constant := 0; -- No alternate signal stack is used on this platform private type Private_Data is limited record Thread_Desc : aliased System.OS_Interface.Thread_Descriptor; -- Thread descriptor associated to the ATCB to which it belongs Thread : aliased System.OS_Interface.Thread_Id := System.OS_Interface.Null_Thread_Id; -- Thread Id associated to the ATCB to which it belongs. -- ??? It is mostly used by GDB, so we may want to remove it at some -- point. 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. Lwp : aliased System.Address := System.Null_Address; -- This element duplicates the Thread element. It is read by gdb when -- the remote protocol is used. end record; end System.Task_Primitives;