+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . T A S K _ I N F O --
--- --
--- S p e c --
--- (Compiler Interface) --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1998-2000 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 2, 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; 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. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This is a DEC Unix 4.0d version of this package.
-
--- This package contains the definitions and routines associated with the
--- implementation of the Task_Info pragma.
-
--- Note: the compiler generates direct calls to this interface, via Rtsfind.
--- Any changes to this interface may require corresponding compiler changes.
-
-with Unchecked_Deallocation;
-package System.Task_Info is
-pragma Elaborate_Body;
--- To ensure that a body is allowed
-
- -----------------------------------------
- -- Implementation of Task_Info Feature --
- -----------------------------------------
-
- -- The Task_Info pragma:
-
- -- pragma Task_Info (EXPRESSION);
-
- -- allows the specification on a task by task basis of a value of type
- -- System.Task_Info.Task_Info_Type to be passed to a task when it is
- -- created. The specification of this type, and the effect on the task
- -- that is created is target dependent.
-
- -- The Task_Info pragma appears within a task definition (compare the
- -- definition and implementation of pragma Priority). If no such pragma
- -- appears, then the value Task_Info_Unspecified is passed. If a pragma
- -- is present, then it supplies an alternative value. If the argument of
- -- the pragma is a discriminant reference, then the value can be set on
- -- a task by task basis by supplying the appropriate discriminant value.
-
- -- Note that this means that the type used for Task_Info_Type must be
- -- suitable for use as a discriminant (i.e. a scalar or access type).
-
- ------------------
- -- Declarations --
- ------------------
-
- type Scope_Type is
- (Process_Scope,
- -- Contend only with threads in same process
-
- System_Scope,
- -- Contend with all threads on same CPU
-
- Default_Scope);
-
- type Thread_Attributes is record
- Bind_To_Cpu_Number : Integer;
- -- -1: Do nothing
- -- 0: Unbind
- -- 1-N: Bind all unbound threads to this CPU
-
- Contention_Scope : Scope_Type;
- end record;
-
- type Task_Info_Type is access all Thread_Attributes;
- -- Type used for passing information to task create call, using the
- -- Task_Info pragma. This type may be specialized for individual
- -- implementations, but it must be a type that can be used as a
- -- discriminant (i.e. a scalar or access type).
-
- type Task_Image_Type is access String;
- -- Used to generate a meaningful identifier for tasks that are variables
- -- and components of variables.
-
- procedure Free_Task_Image is new
- Unchecked_Deallocation (String, Task_Image_Type);
-
- Unspecified_Thread_Attribute : aliased Thread_Attributes :=
- Thread_Attributes'(-1, Default_Scope);
-
- Unspecified_Task_Info : constant Task_Info_Type :=
- Unspecified_Thread_Attribute'Access;
- -- Value passed to task in the absence of a Task_Info pragma
- -- Don't call new here because the tasking run time has not been
- -- elaborated yet, so calling Task_Lock is unsafe.
-
-end System.Task_Info;
projects / msp430-gcc.git / blobdiff