gcc/ada/s-osinte-lynxos.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) 2001-2007, AdaCore                     --
  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 2,  or (at your option) any later ver- --
  14 -- sion. GNARL 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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is a LynxOS (POSIX Threads) version of this package
  35
  36 pragma Polling (Off);
  37 --  Turn off polling, we do not want ATC polling to take place during
  38 --  tasking operations. It causes infinite loops and other problems.
  39
  40 package body System.OS_Interface is
  41
  42    use Interfaces.C;
  43
  44    -----------------
  45    -- To_Duration --
  46    -----------------
  47
  48    function To_Duration (TS : timespec) return Duration is
  49    begin
  50       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  51    end To_Duration;
  52
  53    -----------------
  54    -- To_Timespec --
  55    -----------------
  56
  57    function To_Timespec (D : Duration) return timespec is
  58       S : time_t;
  59       F : Duration;
  60
  61    begin
  62       S := time_t (Long_Long_Integer (D));
  63       F := D - Duration (S);
  64
  65       --  If F has negative value due to a round-up, adjust for positive F
  66       --  value.
  67
  68       if F < 0.0 then
  69          S := S - 1;
  70          F := F + 1.0;
  71       end if;
  72
  73       return timespec'(tv_sec => S,
  74                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  75    end To_Timespec;
  76
  77    -------------
  78    -- sigwait --
  79    -------------
  80
  81    function sigwait
  82      (set :  access sigset_t;
  83       sig :  access Signal)
  84       return int
  85    is
  86       function sigwaitinfo
  87         (set   : access sigset_t;
  88          info  : System.Address) return Signal;
  89       pragma Import (C, sigwaitinfo, "sigwaitinfo");
  90
  91    begin
  92       sig.all := sigwaitinfo (set, Null_Address);
  93
  94       if sig.all = -1 then
  95          return errno;
  96       end if;
  97
  98       return 0;
  99    end sigwait;
 100
 101    --------------------
 102    -- Get_Stack_Base --
 103    --------------------
 104
 105    function Get_Stack_Base (thread : pthread_t) return Address is
 106       pragma Warnings (Off, thread);
 107
 108    begin
 109       return Null_Address;
 110    end Get_Stack_Base;
 111
 112    ------------------
 113    -- pthread_init --
 114    ------------------
 115
 116    procedure pthread_init is
 117    begin
 118       null;
 119    end pthread_init;
 120
 121 end System.OS_Interface;