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 --                                                                          --
  10 --              Copyright (C) 1991-2001 Florida State University            --
  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,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, 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. It is --
  31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  32 -- State University (http://www.gnat.com).                                  --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This is the DEC Unix and IRIX version of this package.
  37
  38 --  This package encapsulates all direct interfaces to OS services
  39 --  that are needed by children of System.
  40
  41 pragma Polling (Off);
  42 --  Turn off polling, we do not want ATC polling to take place during
  43 --  tasking operations. It causes infinite loops and other problems.
  44
  45 with Interfaces.C; use Interfaces.C;
  46 package body System.OS_Interface is
  47
  48    ------------------
  49    -- pthread_init --
  50    ------------------
  51
  52    procedure pthread_init is
  53    begin
  54       null;
  55    end pthread_init;
  56
  57    -----------------
  58    -- To_Duration --
  59    -----------------
  60
  61    function To_Duration (TS : timespec) return Duration is
  62    begin
  63       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  64    end To_Duration;
  65
  66    function To_Duration (TV : struct_timeval) return Duration is
  67    begin
  68       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  69    end To_Duration;
  70
  71    -----------------
  72    -- To_Timespec --
  73    -----------------
  74
  75    function To_Timespec (D : Duration) return timespec is
  76       S : time_t;
  77       F : Duration;
  78
  79    begin
  80       S := time_t (Long_Long_Integer (D));
  81       F := D - Duration (S);
  82
  83       --  If F has negative value due to a round-up, adjust for positive F
  84       --  value.
  85
  86       if F < 0.0 then
  87          S := S - 1;
  88          F := F + 1.0;
  89       end if;
  90
  91       return timespec' (tv_sec => S,
  92         tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  93    end To_Timespec;
  94
  95    function To_Timeval (D : Duration) return struct_timeval is
  96       S : time_t;
  97       F : Duration;
  98
  99    begin
 100       S := time_t (Long_Long_Integer (D));
 101       F := D - Duration (S);
 102
 103       --  If F has negative value due to a round-up, adjust for positive F
 104       --  value.
 105
 106       if F < 0.0 then
 107          S := S - 1;
 108          F := F + 1.0;
 109       end if;
 110
 111       return struct_timeval' (tv_sec => S,
 112         tv_usec => time_t (Long_Long_Integer (F * 10#1#E6)));
 113    end To_Timeval;
 114
 115 end System.OS_Interface;