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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) 1995-2006, AdaCore --
+-- --
+-- GNARL 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. GNARL 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 GNARL; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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. --
+-- --
+-- 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;