gcc/ada/s-osinte-tru64.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) 1998-2007, Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is the DEC Unix version of this package
  35
  36 --  This package encapsulates all direct interfaces to OS services
  37 --  that are needed by children of System.
  38
  39 pragma Polling (Off);
  40 --  Turn off polling, we do not want ATC polling to take place during
  41 --  tasking operations. It causes infinite loops and other problems.
  42
  43 with Interfaces.C; use Interfaces.C;
  44 with System.Machine_Code; use System.Machine_Code;
  45
  46 package body System.OS_Interface is
  47
  48    --------------------
  49    -- Get_Stack_Base --
  50    --------------------
  51
  52    function Get_Stack_Base (thread : pthread_t) return Address is
  53       pragma Unreferenced (thread);
  54    begin
  55       return Null_Address;
  56    end Get_Stack_Base;
  57
  58    ------------------
  59    -- pthread_init --
  60    ------------------
  61
  62    procedure pthread_init is
  63    begin
  64       null;
  65    end pthread_init;
  66
  67    ------------------
  68    -- pthread_self --
  69    ------------------
  70
  71    function pthread_self return pthread_t is
  72       Self : pthread_t;
  73    begin
  74       Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
  75            "bis $31, $0, %0",
  76            Outputs  => pthread_t'Asm_Output ("=r", Self),
  77            Clobber  => "$0",
  78            Volatile => True);
  79       return Self;
  80    end pthread_self;
  81
  82    ----------------------
  83    -- Hide_Yellow_Zone --
  84    ----------------------
  85
  86    procedure Hide_Unhide_Yellow_Zone (Hide : Boolean) is
  87       type Teb_Ptr is access all pthread_teb_t;
  88       Teb : Teb_Ptr;
  89       Res : Interfaces.C.int;
  90       pragma Unreferenced (Res);
  91
  92    begin
  93       --  Get the Thread Environment Block address
  94
  95       Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
  96            "bis $31, $0, %0",
  97            Outputs  => Teb_Ptr'Asm_Output ("=r", Teb),
  98            Clobber  => "$0",
  99            Volatile => True);
 100
 101       --  Stick a guard page right above the Yellow Zone if it exists
 102
 103       if Teb.all.stack_yellow /= Teb.all.stack_guard then
 104          if Hide then
 105             Res := mprotect (Teb.all.stack_yellow, Get_Page_Size, PROT_ON);
 106          else
 107             Res := mprotect (Teb.all.stack_yellow, Get_Page_Size, PROT_OFF);
 108          end if;
 109       end if;
 110    end Hide_Unhide_Yellow_Zone;
 111
 112    -----------------
 113    -- To_Duration --
 114    -----------------
 115
 116    function To_Duration (TS : timespec) return Duration is
 117    begin
 118       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
 119    end To_Duration;
 120
 121    -----------------
 122    -- To_Timespec --
 123    -----------------
 124
 125    function To_Timespec (D : Duration) return timespec is
 126       S : time_t;
 127       F : Duration;
 128
 129    begin
 130       S := time_t (Long_Long_Integer (D));
 131       F := D - Duration (S);
 132
 133       --  If F has negative value due to a round-up, adjust for positive F
 134       --  value.
 135
 136       if F < 0.0 then
 137          S := S - 1;
 138          F := F + 1.0;
 139       end if;
 140
 141       return timespec'(tv_sec => S,
 142                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 143    end To_Timespec;
 144
 145 end System.OS_Interface;