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------------------------------------------------------------------------------
--                                                                          --
--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
--                                                                          --
--                   S Y S T E M . O S _ I N T E R F A C E                  --
--                                                                          --
--                                  B o d y                                 --
--                                                                          --
--             Copyright (C) 1991-1994, Florida State University            --
--                     Copyright (C) 1995-2010, AdaCore                     --
--                                                                          --
-- 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/>.                                          --
--                                                                          --
-- GNARL was developed by the GNARL team at Florida State University.       --
-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
--                                                                          --
------------------------------------------------------------------------------
 
--  This is a OpenVMS/Alpha version of this package
 
--  This package encapsulates all direct interfaces to OS services
--  that are needed by children of System.
 
pragma Polling (Off);
--  Turn off polling, we do not want ATC polling to take place during
--  tasking operations. It causes infinite loops and other problems.
 
with Interfaces.C; use Interfaces.C;
with System.Machine_Code; use System.Machine_Code;
 
package body System.OS_Interface is
 
   ------------------
   -- pthread_self --
   ------------------
 
   function pthread_self return pthread_t is
      use ASCII;
      Self : pthread_t;
 
   begin
      Asm ("call_pal 0x9e" & LF & HT &
           "bis $31, $0, %0",
           Outputs  => pthread_t'Asm_Output ("=r", Self),
           Clobber  => "$0",
           Volatile => True);
      return Self;
   end pthread_self;
 
   -----------------
   -- sched_yield --
   -----------------
 
   function sched_yield return int is
      procedure sched_yield_base;
      pragma Import (C, sched_yield_base, "PTHREAD_YIELD_NP");
 
   begin
      sched_yield_base;
      return 0;
   end sched_yield;
 
end System.OS_Interface;