gcc/ada/5iosinte.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 --                                                                          --
  10 --             Copyright (C) 1991-2001 Florida State University             --
  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,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, 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. It is --
  31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  32 -- State University (http://www.gnat.com).                                  --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This is a GNU/LinuxThreads, Solaris pthread and HP-UX pthread version
  37 --  of this package.
  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 --  This package encapsulates all direct interfaces to OS services
  44 --  that are needed by children of System.
  45
  46 with Interfaces.C; use Interfaces.C;
  47 package body System.OS_Interface is
  48
  49    --------------------
  50    -- Get_Stack_Base --
  51    --------------------
  52
  53    function Get_Stack_Base (thread : pthread_t) return Address is
  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    -- To_Duration --
  69    -----------------
  70
  71    function To_Duration (TS : timespec) return Duration is
  72    begin
  73       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  74    end To_Duration;
  75
  76    function To_Duration (TV : struct_timeval) return Duration is
  77    begin
  78       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  79    end To_Duration;
  80
  81    -----------------
  82    -- To_Timespec --
  83    -----------------
  84
  85    function To_Timespec (D : Duration) return timespec is
  86       S : time_t;
  87       F : Duration;
  88
  89    begin
  90       S := time_t (Long_Long_Integer (D));
  91       F := D - Duration (S);
  92
  93       --  If F has negative value due to a round-up, adjust for positive F
  94       --  value.
  95
  96       if F < 0.0 then
  97          S := S - 1;
  98          F := F + 1.0;
  99       end if;
 100
 101       return timespec'
 102         (tv_sec => S, tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 103    end To_Timespec;
 104
 105    ----------------
 106    -- To_Timeval --
 107    ----------------
 108
 109    function To_Timeval (D : Duration) return struct_timeval is
 110       S : time_t;
 111       F : Duration;
 112
 113    begin
 114       S := time_t (Long_Long_Integer (D));
 115       F := D - Duration (S);
 116
 117       --  If F has negative value due to a round-up, adjust for positive F
 118       --  value.
 119
 120       if F < 0.0 then
 121          S := S - 1;
 122          F := F + 1.0;
 123       end if;
 124
 125       return struct_timeval'
 126         (tv_sec => S, tv_usec => time_t (Long_Long_Integer (F * 10#1#E6)));
 127    end To_Timeval;
 128
 129 end System.OS_Interface;