gcc/ada/libgnarl/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) 1991-2017, Florida State University            --
  10 --                     Copyright (C) 1995-2024, 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 --  This package encapsulates all direct interfaces to OS services
  36 --  that are needed by children of System.
  37
  38 with Interfaces.C; use Interfaces.C;
  39 package body System.OS_Interface is
  40
  41    --------------------
  42    -- Get_Stack_Base --
  43    --------------------
  44
  45    function Get_Stack_Base (thread : pthread_t) return Address is
  46       pragma Warnings (Off, thread);
  47
  48    begin
  49       return Null_Address;
  50    end Get_Stack_Base;
  51
  52    ------------------
  53    -- pthread_init --
  54    ------------------
  55
  56    procedure pthread_init is
  57    begin
  58       null;
  59    end pthread_init;
  60
  61    -----------------
  62    -- To_Duration --
  63    -----------------
  64
  65    function To_Duration (TS : timespec) return Duration is
  66    begin
  67       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  68    end To_Duration;
  69
  70    ------------------------
  71    -- To_Target_Priority --
  72    ------------------------
  73
  74    function To_Target_Priority
  75      (Prio : System.Any_Priority) return Interfaces.C.int
  76    is
  77    begin
  78       return Interfaces.C.int (Prio);
  79    end To_Target_Priority;
  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'(tv_sec => S,
 102                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 103    end To_Timespec;
 104
 105 end System.OS_Interface;