old-autovect-branch/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) 1998-2005, 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       return Self;
  79    end pthread_self;
  80
  81    ----------------------
  82    -- Hide_Yellow_Zone --
  83    ----------------------
  84
  85    procedure Hide_Yellow_Zone is
  86       type Teb_Ptr is access all pthread_teb_t;
  87       Teb : Teb_Ptr;
  88       Res : Interfaces.C.int;
  89       pragma Unreferenced (Res);
  90
  91    begin
  92       --  Get the Thread Environment Block address
  93
  94       Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
  95            "bis $31, $0, %0",
  96            Outputs => Teb_Ptr'Asm_Output ("=r", Teb),
  97            Clobber => "$0");
  98
  99       --  Stick a guard page right above the Yellow Zone if it exists
 100
 101       if Teb.all.stack_yellow /= Teb.all.stack_guard then
 102          Res := mprotect (Teb.all.stack_yellow, Get_Page_Size, PROT_ON);
 103       end if;
 104    end Hide_Yellow_Zone;
 105
 106    -----------------
 107    -- To_Duration --
 108    -----------------
 109
 110    function To_Duration (TS : timespec) return Duration is
 111    begin
 112       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
 113    end To_Duration;
 114
 115    function To_Duration (TV : struct_timeval) return Duration is
 116    begin
 117       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
 118    end To_Duration;
 119
 120    -----------------
 121    -- To_Timespec --
 122    -----------------
 123
 124    function To_Timespec (D : Duration) return timespec is
 125       S : time_t;
 126       F : Duration;
 127
 128    begin
 129       S := time_t (Long_Long_Integer (D));
 130       F := D - Duration (S);
 131
 132       --  If F has negative value due to a round-up, adjust for positive F
 133       --  value.
 134
 135       if F < 0.0 then
 136          S := S - 1;
 137          F := F + 1.0;
 138       end if;
 139
 140       return timespec'(tv_sec => S,
 141                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 142    end To_Timespec;
 143
 144    ----------------
 145    -- To_Timeval --
 146    ----------------
 147
 148    function To_Timeval (D : Duration) return struct_timeval is
 149       S : time_t;
 150       F : Duration;
 151
 152    begin
 153       S := time_t (Long_Long_Integer (D));
 154       F := D - Duration (S);
 155
 156       --  If F has negative value due to a round-up, adjust for positive F
 157       --  value.
 158
 159       if F < 0.0 then
 160          S := S - 1;
 161          F := F + 1.0;
 162       end if;
 163
 164       return
 165         struct_timeval'
 166           (tv_sec => S,
 167            tv_usec => time_t (Long_Long_Integer (F * 10#1#E6)));
 168    end To_Timeval;
 169
 170 end System.OS_Interface;