1------------------------------------------------------------------------------
2--                                                                          --
3--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
4--                                                                          --
5--                   S Y S T E M . O S _ I N T E R F A C E                  --
6--                                                                          --
7--                                  B o d y                                 --
8--                                                                          --
9--             Copyright (C) 1991-1994, Florida State University            --
10--             Copyright (C) 1995-2003, Ada Core Technologies               --
11--                                                                          --
12-- GNARL is free software; you can  redistribute it  and/or modify it under --
13-- terms of the  GNU General Public License as published  by the Free Soft- --
14-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
15-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
16-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
17-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
18-- for  more details.  You should have  received  a copy of the GNU General --
19-- Public License  distributed with GNARL; see file COPYING.  If not, write --
20-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
21-- MA 02111-1307, USA.                                                      --
22--                                                                          --
23-- As a special exception,  if other files  instantiate  generics from this --
24-- unit, or you link  this unit with other files  to produce an executable, --
25-- this  unit  does not  by itself cause  the resulting  executable  to  be --
26-- covered  by the  GNU  General  Public  License.  This exception does not --
27-- however invalidate  any other reasons why  the executable file  might be --
28-- covered by the  GNU Public License.                                      --
29--                                                                          --
30-- GNARL was developed by the GNARL team at Florida State University.       --
31-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
32--                                                                          --
33------------------------------------------------------------------------------
34
35--  This is a OpenVMS/Alpha version of this package.
36
37--  This package encapsulates all direct interfaces to OS services
38--  that are needed by children of System.
39
40pragma Polling (Off);
41--  Turn off polling, we do not want ATC polling to take place during
42--  tasking operations. It causes infinite loops and other problems.
43
44with Interfaces.C; use Interfaces.C;
45with System.Machine_Code; use System.Machine_Code;
46
47package body System.OS_Interface is
48
49   ------------------
50   -- pthread_self --
51   ------------------
52
53   function pthread_self return pthread_t is
54      use ASCII;
55      Self : pthread_t;
56
57   begin
58      Asm ("call_pal 0x9e" & LF & HT &
59           "bis $31, $0, %0",
60           Outputs => pthread_t'Asm_Output ("=r", Self),
61           Clobber => "$0");
62      return Self;
63   end pthread_self;
64
65   -----------------
66   -- sched_yield --
67   -----------------
68
69   function sched_yield return int is
70      procedure sched_yield_base;
71      pragma Import (C, sched_yield_base, "PTHREAD_YIELD_NP");
72
73   begin
74      sched_yield_base;
75      return 0;
76   end sched_yield;
77
78end System.OS_Interface;
79