gcc/ada/libgnarl/s-osinte__dragonfly.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) 1991-2020, 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 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT 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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University. It is --
  28 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  29 -- State University (http://www.gnat.com).                                  --
  30 --                                                                          --
  31 ------------------------------------------------------------------------------
  32
  33 --  This is the DragonFly THREADS version of this package
  34
  35 with Interfaces.C; use Interfaces.C;
  36
  37 package body System.OS_Interface is
  38
  39    -----------
  40    -- Errno --
  41    -----------
  42
  43    function Errno return int is
  44       type int_ptr is access all int;
  45
  46       function internal_errno return int_ptr;
  47       pragma Import (C, internal_errno, "__get_errno");
  48
  49    begin
  50       return (internal_errno.all);
  51    end Errno;
  52
  53    --------------------
  54    -- Get_Stack_Base --
  55    --------------------
  56
  57    function Get_Stack_Base (thread : pthread_t) return Address is
  58       pragma Unreferenced (thread);
  59    begin
  60       return Null_Address;
  61    end Get_Stack_Base;
  62
  63    ------------------
  64    -- pthread_init --
  65    ------------------
  66
  67    procedure pthread_init is
  68    begin
  69       null;
  70    end pthread_init;
  71
  72    -----------------
  73    -- To_Duration --
  74    -----------------
  75
  76    function To_Duration (TS : timespec) return Duration is
  77    begin
  78       return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
  79    end To_Duration;
  80
  81    ------------------------
  82    -- To_Target_Priority --
  83    ------------------------
  84
  85    function To_Target_Priority
  86      (Prio : System.Any_Priority) return Interfaces.C.int
  87    is
  88    begin
  89       return Interfaces.C.int (Prio);
  90    end To_Target_Priority;
  91
  92    -----------------
  93    -- To_Timespec --
  94    -----------------
  95
  96    function To_Timespec (D : Duration) return timespec is
  97       S : time_t;
  98       F : Duration;
  99
 100    begin
 101       S := time_t (Long_Long_Integer (D));
 102       F := D - Duration (S);
 103
 104       --  If F has negative value due to a round-up, adjust for positive F
 105       --  value.
 106
 107       if F < 0.0 then
 108          S := S - 1;
 109          F := F + 1.0;
 110       end if;
 111
 112       return timespec'(ts_sec => S,
 113                        ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 114    end To_Timespec;
 115
 116 end System.OS_Interface;