gcc/ada/libgnarl/s-osinte__qnx.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) 1995-2018, 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 QNX 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    -- sigaltstack --
  47    -----------------
  48
  49    function sigaltstack
  50      (ss  : not null access stack_t;
  51       oss : access stack_t) return int
  52    is
  53       pragma Unreferenced (ss, oss);
  54    begin
  55       return 0;
  56    end sigaltstack;
  57
  58    --------------------
  59    -- Get_Stack_Base --
  60    --------------------
  61
  62    function Get_Stack_Base (thread : pthread_t) return Address is
  63       pragma Unreferenced (thread);
  64    begin
  65       return Null_Address;
  66    end Get_Stack_Base;
  67
  68    ------------------
  69    -- pthread_init --
  70    ------------------
  71
  72    procedure pthread_init is
  73    begin
  74       null;
  75    end pthread_init;
  76
  77    -----------------
  78    -- To_Duration --
  79    -----------------
  80
  81    function To_Duration (TS : timespec) return Duration is
  82    begin
  83       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  84    end To_Duration;
  85
  86    ------------------------
  87    -- To_Target_Priority --
  88    ------------------------
  89
  90    function To_Target_Priority
  91      (Prio : System.Any_Priority) return Interfaces.C.int
  92    is
  93    begin
  94       return Interfaces.C.int (Prio + 1);
  95    end To_Target_Priority;
  96
  97    -----------------
  98    -- To_Timespec --
  99    -----------------
 100
 101    function To_Timespec (D : Duration) return timespec is
 102       S : time_t;
 103       F : Duration;
 104
 105    begin
 106       S := time_t (Long_Long_Integer (D));
 107       F := D - Duration (S);
 108
 109       --  If F has negative value due to a round-up, adjust for positive F
 110       --  value.
 111
 112       if F < 0.0 then
 113          S := S - 1;
 114          F := F + 1.0;
 115       end if;
 116
 117       return timespec'(tv_sec => S,
 118                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 119    end To_Timespec;
 120
 121 end System.OS_Interface;