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) 1995-2006, AdaCore                     --
  11 --                                                                          --
  12 -- GNARL 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 2,  or (at your option) any later ver- --
  15 -- sion. GNARL 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.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  20 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  21 -- Boston, MA 02110-1301, USA.                                              --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNARL was developed by the GNARL team at Florida State University.       --
  31 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This is a GNU/LinuxThreads, Solaris pthread and HP-UX pthread version
  36 --  of this package.
  37
  38 pragma Polling (Off);
  39 --  Turn off polling, we do not want ATC polling to take place during
  40 --  tasking operations. It causes infinite loops and other problems.
  41
  42 --  This package encapsulates all direct interfaces to OS services
  43 --  that are needed by children of System.
  44
  45 with Interfaces.C; use Interfaces.C;
  46 package body System.OS_Interface is
  47
  48    --------------------
  49    -- Get_Stack_Base --
  50    --------------------
  51
  52    function Get_Stack_Base (thread : pthread_t) return Address is
  53       pragma Warnings (Off, thread);
  54
  55    begin
  56       return Null_Address;
  57    end Get_Stack_Base;
  58
  59    ------------------
  60    -- pthread_init --
  61    ------------------
  62
  63    procedure pthread_init is
  64    begin
  65       null;
  66    end pthread_init;
  67
  68    -----------------
  69    -- To_Duration --
  70    -----------------
  71
  72    function To_Duration (TS : timespec) return Duration is
  73    begin
  74       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  75    end To_Duration;
  76
  77    ------------------------
  78    -- To_Target_Priority --
  79    ------------------------
  80
  81    function To_Target_Priority
  82      (Prio : System.Any_Priority) return Interfaces.C.int
  83    is
  84    begin
  85       return Interfaces.C.int (Prio);
  86    end To_Target_Priority;
  87
  88    -----------------
  89    -- To_Timespec --
  90    -----------------
  91
  92    function To_Timespec (D : Duration) return timespec is
  93       S : time_t;
  94       F : Duration;
  95
  96    begin
  97       S := time_t (Long_Long_Integer (D));
  98       F := D - Duration (S);
  99
 100       --  If F has negative value due to a round-up, adjust for positive F
 101       --  value.
 102
 103       if F < 0.0 then
 104          S := S - 1;
 105          F := F + 1.0;
 106       end if;
 107
 108       return timespec'(tv_sec => S,
 109                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 110    end To_Timespec;
 111
 112 end System.OS_Interface;