gcc/ada/5aosinte.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA 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 --                             $Revision: 1.15 $
  10 --                                                                          --
  11 --              Copyright (C) 1991-2001 Florida State University            --
  12 --                                                                          --
  13 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNARL was developed by the GNARL team at Florida State University. It is --
  32 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  33 -- State University (http://www.gnat.com).                                  --
  34 --                                                                          --
  35 ------------------------------------------------------------------------------
  36
  37 --  This is the DEC Unix and IRIX version of this package.
  38
  39 --  This package encapsulates all direct interfaces to OS services
  40 --  that are needed by children of System.
  41
  42 pragma Polling (Off);
  43 --  Turn off polling, we do not want ATC polling to take place during
  44 --  tasking operations. It causes infinite loops and other problems.
  45
  46 with Interfaces.C; use Interfaces.C;
  47 package body System.OS_Interface is
  48
  49    ------------------
  50    -- pthread_init --
  51    ------------------
  52
  53    procedure pthread_init is
  54    begin
  55       null;
  56    end pthread_init;
  57
  58    -----------------
  59    -- To_Duration --
  60    -----------------
  61
  62    function To_Duration (TS : timespec) return Duration is
  63    begin
  64       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  65    end To_Duration;
  66
  67    function To_Duration (TV : struct_timeval) return Duration is
  68    begin
  69       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  70    end To_Duration;
  71
  72    -----------------
  73    -- To_Timespec --
  74    -----------------
  75
  76    function To_Timespec (D : Duration) return timespec is
  77       S : time_t;
  78       F : Duration;
  79
  80    begin
  81       S := time_t (Long_Long_Integer (D));
  82       F := D - Duration (S);
  83
  84       --  If F has negative value due to a round-up, adjust for positive F
  85       --  value.
  86
  87       if F < 0.0 then
  88          S := S - 1;
  89          F := F + 1.0;
  90       end if;
  91
  92       return timespec' (tv_sec => S,
  93         tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  94    end To_Timespec;
  95
  96    function To_Timeval (D : Duration) return struct_timeval 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 struct_timeval' (tv_sec => S,
 113         tv_usec => time_t (Long_Long_Integer (F * 10#1#E6)));
 114    end To_Timeval;
 115
 116 end System.OS_Interface;