2010-07-27 Paolo Carlini <paolo.carlini@oracle.com>
[official-gcc/alias-decl.git] / gcc / ada / s-osinte-vms.adb
bloba1d04975ea8728c133efcfd6239cd8acb5b5f528
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT 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) 1995-2009, AdaCore --
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, 51 Franklin Street, Fifth Floor, --
21 -- Boston, MA 02110-1301, 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 ------------------------------------------------------------------------------
35 -- This is a OpenVMS/Alpha version of this package
37 -- This package encapsulates all direct interfaces to OS services
38 -- that are needed by children of System.
40 pragma 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.
44 with Interfaces.C; use Interfaces.C;
45 with System.Machine_Code; use System.Machine_Code;
47 package body System.OS_Interface is
49 ------------------
50 -- pthread_self --
51 ------------------
53 function pthread_self return pthread_t is
54 use ASCII;
55 Self : pthread_t;
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 Volatile => True);
63 return Self;
64 end pthread_self;
66 -----------------
67 -- sched_yield --
68 -----------------
70 function sched_yield return int is
71 procedure sched_yield_base;
72 pragma Import (C, sched_yield_base, "PTHREAD_YIELD_NP");
74 begin
75 sched_yield_base;
76 return 0;
77 end sched_yield;
79 end System.OS_Interface;