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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                     S Y S T E M . T A S K _ I N F O                      --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package contains the definitions and routines associated with the
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--  implementation and use of the Task_Info pragma. It is specialized
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--  appropriately for targets that make use of this pragma.
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--  Note: the compiler generates direct calls to this interface, via Rtsfind.
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--  Any changes to this interface may require corresponding compiler changes.
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--  This unit may be used directly from an application program by providing
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--  an appropriate WITH, and the interface can be expected to remain stable.
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--  This is the Solaris (native) version of this module
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with System.OS_Interface;
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package System.Task_Info is
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   pragma Preelaborate;
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   pragma Elaborate_Body;
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   --  To ensure that a body is allowed
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   -----------------------------------------------------
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   -- Binding of Tasks to LWPs and LWPs to processors --
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   -----------------------------------------------------
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   --  The Solaris implementation of the GNU Low-Level Interface (GNULLI)
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   --  implements each Ada task as a Solaris thread.  The Solaris thread
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   --  library distributes threads across one or more LWPs (Light Weight
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   --  Process) that are members of the same process. Solaris distributes
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   --  processes and LWPs across the available CPUs on a given machine. The
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   --  pragma Task_Info provides the mechanism to control the distribution
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   --  of tasks to LWPs, and LWPs to processors.
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   --  Each thread has a number of attributes that dictate it's scheduling.
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   --  These attributes are:
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   --
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   --      New_LWP:       whether a new LWP is created for this thread.
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   --
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   --      Bound_To_LWP:  whether the thread is bound to a specific LWP
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   --                     for its entire lifetime.
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   --
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   --      CPU:           the CPU number associated to the LWP
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   --
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   --  The Task_Info pragma:
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   --    pragma Task_Info (EXPRESSION);
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   --  allows the specification on a task by task basis of a value of type
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   --  System.Task_Info.Task_Info_Type to be passed to a task when it is
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   --  created. The specification of this type, and the effect on the task
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   --  that is created is target dependent.
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   --  The Task_Info pragma appears within a task definition (compare the
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   --  definition and implementation of pragma Priority). If no such pragma
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   --  appears, then the value Unspecified_Task_Info is passed. If a pragma
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   --  is present, then it supplies an alternative value. If the argument of
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   --  the pragma is a discriminant reference, then the value can be set on
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   --  a task by task basis by supplying the appropriate discriminant value.
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   --  Note that this means that the type used for Task_Info_Type must be
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   --  suitable for use as a discriminant (i.e. a scalar or access type).
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   -----------------------
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   -- Thread Attributes --
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   -----------------------
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   subtype CPU_Number is System.OS_Interface.processorid_t;
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   CPU_UNCHANGED : constant CPU_Number := System.OS_Interface.PBIND_QUERY;
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   --  Do not bind the LWP to a specific processor
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   ANY_CPU       : constant CPU_Number := System.OS_Interface.PBIND_NONE;
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   --  Bind the LWP to any processor
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   Invalid_CPU_Number : exception;
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   type Thread_Attributes (New_LWP : Boolean) is record
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      Bound_To_LWP     : Boolean    := True;
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      case New_LWP is
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         when False =>
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            null;
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         when True =>
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            CPU        : CPU_Number := CPU_UNCHANGED;
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      end case;
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   end record;
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   Default_Thread_Attributes : constant Thread_Attributes := (False, True);
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   function Unbound_Thread_Attributes
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      return Thread_Attributes;
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   function Bound_Thread_Attributes
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      return Thread_Attributes;
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   function Bound_Thread_Attributes (CPU : CPU_Number)
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      return Thread_Attributes;
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   type Task_Info_Type is access all Thread_Attributes;
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   function New_Unbound_Thread_Attributes
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      return Task_Info_Type;
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   function New_Bound_Thread_Attributes
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      return Task_Info_Type;
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   function New_Bound_Thread_Attributes (CPU : CPU_Number)
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      return Task_Info_Type;
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   Unspecified_Task_Info : constant Task_Info_Type := null;
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end System.Task_Info;

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