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) 1995-2014, 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 version is for POSIX-like operating systems
  34
  35 pragma Polling (Off);
  36 --  Turn off polling, we do not want ATC polling to take place during
  37 --  tasking operations. It causes infinite loops and other problems.
  38
  39 --  This package encapsulates all direct interfaces to OS services
  40 --  that are needed by children of System.
  41
  42 with Interfaces.C; use Interfaces.C;
  43 package body System.OS_Interface is
  44
  45    --------------------
  46    -- Get_Stack_Base --
  47    --------------------
  48
  49    function Get_Stack_Base (thread : pthread_t) return Address is
  50       pragma Warnings (Off, thread);
  51
  52    begin
  53       return Null_Address;
  54    end Get_Stack_Base;
  55
  56    ------------------
  57    -- pthread_init --
  58    ------------------
  59
  60    procedure pthread_init is
  61    begin
  62       null;
  63    end pthread_init;
  64
  65    -----------------
  66    -- To_Duration --
  67    -----------------
  68
  69    function To_Duration (TS : timespec) return Duration is
  70    begin
  71       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  72    end To_Duration;
  73
  74    ------------------------
  75    -- To_Target_Priority --
  76    ------------------------
  77
  78    function To_Target_Priority
  79      (Prio : System.Any_Priority) return Interfaces.C.int
  80    is
  81    begin
  82       return Interfaces.C.int (Prio);
  83    end To_Target_Priority;
  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 end System.OS_Interface;