gcc/ada/s-osinte-vms.adb

   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 ------------------------------------------------------------------------------
  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
  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.
  43
  44 with Interfaces.C; use Interfaces.C;
  45 with System.Machine_Code; use System.Machine_Code;
  46
  47 package 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            Volatile => True);
  63       return Self;
  64    end pthread_self;
  65
  66    -----------------
  67    -- sched_yield --
  68    -----------------
  69
  70    function sched_yield return int is
  71       procedure sched_yield_base;
  72       pragma Import (C, sched_yield_base, "PTHREAD_YIELD_NP");
  73
  74    begin
  75       sched_yield_base;
  76       return 0;
  77    end sched_yield;
  78
  79 end System.OS_Interface;