New Language: Ada

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

1 files changed, 117 insertions, 0 deletions

diff --git a/gcc/ada/5atasinf.ads b/gcc/ada/5atasinf.ads
new file mode 100644
index 00000000000..4ddf7a97e11
--- /dev/null
+++ b/gcc/ada/5atasinf.ads
@@ -0,0 +1,117 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                     S Y S T E M . T A S K _ I N F O                      --
+--                                                                          --
+--                                 S p e c                                  --
+--                           (Compiler Interface)                           --
+--                                                                          --
+--                            $Revision: 1.5 $
+--                                                                          --
+--         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. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  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;