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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                                  --

--                                                                          --

--          Copyright (C) 1992-2009 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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- 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    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This package contains the definitions and routines associated with the

--  implementation and use of the Task_Info pragma. It is specialized

--  appropriately for targets that make use of this pragma.

--  Note: the compiler generates direct calls to this interface, via Rtsfind.

--  Any changes to this interface may require corresponding compiler changes.

--  This unit may be used directly from an application program by providing

--  an appropriate WITH, and the interface can be expected to remain stable.

--  This is the IRIX (kernel threads) version of this package

with Interfaces.C;

package System.Task_Info is

   pragma Preelaborate;

   pragma Elaborate_Body;

   --  To ensure that a body is allowed

   -----------------------------------------

   -- Implementation of Task_Info Feature --

   -----------------------------------------

   --  Pragma Task_Info allows an application to set the underlying

   --  pthread scheduling attributes for a specific task.

   ------------------

   -- Declarations --

   ------------------

   type Thread_Scheduling_Scope is

     (PTHREAD_SCOPE_PROCESS, PTHREAD_SCOPE_SYSTEM);

   for Thread_Scheduling_Scope'Size use Interfaces.C.int'Size;

   type Thread_Scheduling_Inheritance is

      (PTHREAD_EXPLICIT_SCHED, PTHREAD_INHERIT_SCHED);

   for Thread_Scheduling_Inheritance'Size use Interfaces.C.int'Size;

   type Thread_Scheduling_Policy is

      (SCHED_FIFO,   --  The first-in-first-out real-time policy

       SCHED_RR,     --  The round-robin real-time scheduling policy

       SCHED_TS);    --  The timeshare earnings based scheduling policy

   for Thread_Scheduling_Policy'Size use Interfaces.C.int'Size;

   for Thread_Scheduling_Policy use

      (SCHED_FIFO => 1,

       SCHED_RR   => 2,

       SCHED_TS   => 3);

   function SCHED_OTHER return Thread_Scheduling_Policy renames SCHED_TS;

   No_Specified_Priority : constant := -1;

   subtype Thread_Scheduling_Priority is Integer range

     No_Specified_Priority .. 255;

   subtype FIFO_Priority is Thread_Scheduling_Priority range 0 .. 255;

   subtype RR_Priority is Thread_Scheduling_Priority range 0 .. 255;

   subtype TS_Priority is Thread_Scheduling_Priority range 1 .. 40;

   subtype OTHER_Priority is Thread_Scheduling_Priority range 1 .. 40;

   subtype CPU_Number is Integer range -1 .. Integer'Last;

   ANY_CPU : constant CPU_Number := CPU_Number'First;

   type Thread_Attributes is record

      Scope       : Thread_Scheduling_Scope       := PTHREAD_SCOPE_PROCESS;

      Inheritance : Thread_Scheduling_Inheritance := PTHREAD_EXPLICIT_SCHED;

      Policy      : Thread_Scheduling_Policy      := SCHED_RR;

      Priority    : Thread_Scheduling_Priority    := No_Specified_Priority;

      Runon_CPU   : CPU_Number                    := ANY_CPU;

   end record;

   Default_Thread_Attributes : constant Thread_Attributes :=

     (PTHREAD_SCOPE_PROCESS, PTHREAD_EXPLICIT_SCHED, SCHED_RR,

       No_Specified_Priority, ANY_CPU);

   type Task_Info_Type is access all Thread_Attributes;

   Unspecified_Task_Info : constant Task_Info_Type := null;

   --  Value passed to task in the absence of a Task_Info pragma

end System.Task_Info;