gcc/ada/5fosinte.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 --         Copyright (C) 1992-2002, Free Software Foundation, Inc.          --
  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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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 the IRIX version of this package.
  35
  36 --  This package encapsulates all direct interfaces to OS services
  37 --  that are needed by children of System.
  38
  39 pragma Polling (Off);
  40 --  Turn off polling, we do not want ATC polling to take place during
  41 --  tasking operations. It causes infinite loops and other problems.
  42
  43 with Interfaces.C; use Interfaces.C;
  44
  45 package body System.OS_Interface is
  46
  47    ------------------
  48    -- pthread_init --
  49    ------------------
  50
  51    procedure pthread_init is
  52    begin
  53       null;
  54    end pthread_init;
  55
  56    -----------------
  57    -- To_Duration --
  58    -----------------
  59
  60    function To_Duration (TS : timespec) return Duration is
  61    begin
  62       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  63    end To_Duration;
  64
  65    function To_Duration (TV : struct_timeval) return Duration is
  66    begin
  67       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  68    end To_Duration;
  69
  70    -----------------
  71    -- To_Timespec --
  72    -----------------
  73
  74    function To_Timespec (D : Duration) return timespec is
  75       S : time_t;
  76       F : Duration;
  77
  78    begin
  79       S := time_t (Long_Long_Integer (D));
  80       F := D - Duration (S);
  81
  82       --  If F has negative value due to a round-up, adjust for positive F
  83       --  value.
  84
  85       if F < 0.0 then
  86          S := S - 1;
  87          F := F + 1.0;
  88       end if;
  89
  90       return timespec'(tv_sec => S,
  91                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  92    end To_Timespec;
  93
  94    ----------------
  95    -- To_Timeval --
  96    ----------------
  97
  98    function To_Timeval (D : Duration) return struct_timeval is
  99       S : time_t;
 100       F : Duration;
 101
 102    begin
 103       S := time_t (Long_Long_Integer (D));
 104       F := D - Duration (S);
 105
 106       --  If F has negative value due to a round-up, adjust for positive F
 107       --  value.
 108
 109       if F < 0.0 then
 110          S := S - 1;
 111          F := F + 1.0;
 112       end if;
 113
 114       return
 115         struct_timeval'
 116           (tv_sec => S,
 117            tv_usec => time_t (Long_Long_Integer (F * 10#1#E6)));
 118    end To_Timeval;
 119
 120 end System.OS_Interface;