gcc/ada/s-osinte-posix.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) 1995-2010, AdaCore                     --
  11 --                                                                          --
  12 -- GNAT 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 3,  or (at your option) any later ver- --
  15 -- sion.  GNAT 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.                                     --
  18 --                                                                          --
  19 -- As a special exception under Section 7 of GPL version 3, you are granted --
  20 -- additional permissions described in the GCC Runtime Library Exception,   --
  21 -- version 3.1, as published by the Free Software Foundation.               --
  22 --                                                                          --
  23 -- You should have received a copy of the GNU General Public License and    --
  24 -- a copy of the GCC Runtime Library Exception along with this program;     --
  25 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  26 -- <http://www.gnu.org/licenses/>.                                          --
  27 --                                                                          --
  28 -- GNARL was developed by the GNARL team at Florida State University.       --
  29 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  30 --                                                                          --
  31 ------------------------------------------------------------------------------
  32
  33 --  This is a GNU/LinuxThreads, Solaris pthread and HP-UX pthread version
  34 --  of this package.
  35
  36 pragma Polling (Off);
  37 --  Turn off polling, we do not want ATC polling to take place during
  38 --  tasking operations. It causes infinite loops and other problems.
  39
  40 --  This package encapsulates all direct interfaces to OS services
  41 --  that are needed by children of System.
  42
  43 with Interfaces.C; use Interfaces.C;
  44 package body System.OS_Interface is
  45
  46    --------------------
  47    -- Get_Stack_Base --
  48    --------------------
  49
  50    function Get_Stack_Base (thread : pthread_t) return Address is
  51       pragma Warnings (Off, thread);
  52
  53    begin
  54       return Null_Address;
  55    end Get_Stack_Base;
  56
  57    ------------------
  58    -- pthread_init --
  59    ------------------
  60
  61    procedure pthread_init is
  62    begin
  63       null;
  64    end pthread_init;
  65
  66    -----------------
  67    -- To_Duration --
  68    -----------------
  69
  70    function To_Duration (TS : timespec) return Duration is
  71    begin
  72       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  73    end To_Duration;
  74
  75    ------------------------
  76    -- To_Target_Priority --
  77    ------------------------
  78
  79    function To_Target_Priority
  80      (Prio : System.Any_Priority) return Interfaces.C.int
  81    is
  82    begin
  83       return Interfaces.C.int (Prio);
  84    end To_Target_Priority;
  85
  86    -----------------
  87    -- To_Timespec --
  88    -----------------
  89
  90    function To_Timespec (D : Duration) return timespec is
  91       S : time_t;
  92       F : Duration;
  93
  94    begin
  95       S := time_t (Long_Long_Integer (D));
  96       F := D - Duration (S);
  97
  98       --  If F has negative value due to a round-up, adjust for positive F
  99       --  value.
 100
 101       if F < 0.0 then
 102          S := S - 1;
 103          F := F + 1.0;
 104       end if;
 105
 106       return timespec'(tv_sec => S,
 107                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 108    end To_Timespec;
 109
 110 end System.OS_Interface;