New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45952 138bc75d-0d04-0410-961f-82ee72b054a4

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                     S Y S T E M . T A S K _ I N F O                      --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.3 $
+--                                                                          --
+--          Copyright (C) 1992-2000 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. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package contains the definitions and routines associated with the
+--  implementation of the Task_Info pragma.
+
+--  This is the Solaris (native) version of this module.
+
+with System.OS_Interface;
+with Unchecked_Deallocation;
+package System.Task_Info is
+pragma Elaborate_Body;
+--  To ensure that a body is allowed
+
+   -----------------------------------------------------
+   -- Binding of Tasks to LWPs and LWPs to processors --
+   -----------------------------------------------------
+
+   --  The Solaris implementation of the GNU Low-Level Interface (GNULLI)
+   --  implements each Ada task as a Solaris thread.  The Solaris thread
+   --  library distributes threads across one or more LWPs (Light Weight
+   --  Process) that are members of the same process. Solaris distributes
+   --  processes and LWPs across the available CPUs on a given machine. The
+   --  pragma Task_Info provides the mechanism to control the distribution
+   --  of tasks to LWPs, and LWPs to processors.
+
+   --  Each thread has a number of attributes that dictate it's scheduling.
+   --  These attributes are:
+   --
+   --      New_LWP:       whether a new LWP is created for this thread.
+   --
+   --      Bound_To_LWP:  whether the thread is bound to a specific LWP
+   --                     for its entire lifetime.
+   --
+   --      CPU:           the CPU number associated to the LWP
+   --
+
+   --  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).
+
+   -----------------------
+   -- Thread Attributes --
+   -----------------------
+
+   subtype CPU_Number is System.OS_Interface.processorid_t;
+
+   CPU_UNCHANGED : constant CPU_Number := System.OS_Interface.PBIND_QUERY;
+   --  Do not bind the LWP to a specific processor
+
+   ANY_CPU       : constant CPU_Number := System.OS_Interface.PBIND_NONE;
+   --  Bind the LWP to any processor
+
+   Invalid_CPU_Number : exception;
+
+   type Thread_Attributes (New_LWP : Boolean) is record
+      Bound_To_LWP     : Boolean    := True;
+      case New_LWP is
+         when False =>
+            null;
+         when True =>
+            CPU        : CPU_Number := CPU_UNCHANGED;
+      end case;
+   end record;
+
+   Default_Thread_Attributes : constant Thread_Attributes := (False, True);
+
+   function Unbound_Thread_Attributes
+      return Thread_Attributes;
+
+   function Bound_Thread_Attributes
+      return Thread_Attributes;
+
+   function Bound_Thread_Attributes (CPU : CPU_Number)
+      return Thread_Attributes;
+
+   type Task_Info_Type is access all Thread_Attributes;
+
+   function New_Unbound_Thread_Attributes
+      return Task_Info_Type;
+
+   function New_Bound_Thread_Attributes
+      return Task_Info_Type;
+
+   function New_Bound_Thread_Attributes (CPU : CPU_Number)
+      return Task_Info_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_Task_Info : constant Task_Info_Type := null;
+
+end System.Task_Info;