gcc/ada/5aosinte.adb

   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) 1998-2002, 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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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    -- pthread_init --
  50    ------------------
  51
  52    procedure pthread_init is
  53    begin
  54       null;
  55    end pthread_init;
  56
  57    ------------------
  58    -- pthread_self --
  59    ------------------
  60
  61    function pthread_self return pthread_t is
  62       Self : pthread_t;
  63    begin
  64       Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
  65            "bis $31, $0, %0",
  66            Outputs => pthread_t'Asm_Output ("=r", Self),
  67            Clobber => "$0");
  68       return Self;
  69    end pthread_self;
  70
  71    -----------------
  72    -- To_Duration --
  73    -----------------
  74
  75    function To_Duration (TS : timespec) return Duration is
  76    begin
  77       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  78    end To_Duration;
  79
  80    function To_Duration (TV : struct_timeval) return Duration is
  81    begin
  82       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  83    end To_Duration;
  84
  85    -----------------
  86    -- To_Timespec --
  87    -----------------
  88
  89    function To_Timespec (D : Duration) return timespec is
  90       S : time_t;
  91       F : Duration;
  92
  93    begin
  94       S := time_t (Long_Long_Integer (D));
  95       F := D - Duration (S);
  96
  97       --  If F has negative value due to a round-up, adjust for positive F
  98       --  value.
  99
 100       if F < 0.0 then
 101          S := S - 1;
 102          F := F + 1.0;
 103       end if;
 104
 105       return timespec'(tv_sec => S,
 106                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 107    end To_Timespec;
 108
 109    ----------------
 110    -- To_Timeval --
 111    ----------------
 112
 113    function To_Timeval (D : Duration) return struct_timeval is
 114       S : time_t;
 115       F : Duration;
 116
 117    begin
 118       S := time_t (Long_Long_Integer (D));
 119       F := D - Duration (S);
 120
 121       --  If F has negative value due to a round-up, adjust for positive F
 122       --  value.
 123
 124       if F < 0.0 then
 125          S := S - 1;
 126          F := F + 1.0;
 127       end if;
 128
 129       return
 130         struct_timeval'
 131           (tv_sec => S,
 132            tv_usec => time_t (Long_Long_Integer (F * 10#1#E6)));
 133    end To_Timeval;
 134
 135 end System.OS_Interface;