gcc/ada/5bosinte.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) 1997-2001, Free Software Fundation, Inc.          --
  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.       --
  31 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This is a AIX (Native) version of this package
  36
  37 pragma Polling (Off);
  38 --  Turn off polling, we do not want ATC polling to take place during
  39 --  tasking operations. It causes infinite loops and other problems.
  40
  41 with Interfaces.C;
  42
  43 package body System.OS_Interface is
  44
  45    use Interfaces.C;
  46
  47    -----------------
  48    -- To_Duration --
  49    -----------------
  50
  51    function To_Duration (TS : timespec) return Duration is
  52    begin
  53       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  54    end To_Duration;
  55
  56    function To_Duration (TV : struct_timeval) return Duration is
  57    begin
  58       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  59    end To_Duration;
  60
  61    -----------------
  62    -- To_Timespec --
  63    -----------------
  64
  65    function To_Timespec (D : Duration) return timespec is
  66       S : time_t;
  67       F : Duration;
  68
  69    begin
  70       S := time_t (Long_Long_Integer (D));
  71       F := D - Duration (S);
  72
  73       --  If F has negative value due to a round-up, adjust for positive F
  74       --  value.
  75
  76       if F < 0.0 then
  77          S := S - 1;
  78          F := F + 1.0;
  79       end if;
  80
  81       return timespec' (tv_sec => S,
  82         tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  83    end To_Timespec;
  84
  85    ----------------
  86    -- To_Timeval --
  87    ----------------
  88
  89    function To_Timeval (D : Duration) return struct_timeval is
  90       S : long;
  91       F : Duration;
  92
  93    begin
  94       S := long (Long_Long_Integer (D));
  95       F := D - Duration (S);
  96
  97       --  If F has negative value due to a round-up, adjust for positive F
  98       --  value.
  99
 100       if F < 0.0 then
 101          S := S - 1;
 102          F := F + 1.0;
 103       end if;
 104
 105       return struct_timeval' (tv_sec => S,
 106         tv_usec => long (Long_Long_Integer (F * 10#1#E6)));
 107    end To_Timeval;
 108
 109    -------------------
 110    -- clock_gettime --
 111    -------------------
 112
 113    function clock_gettime
 114      (clock_id : clockid_t;
 115       tp       : access timespec)
 116       return int
 117    is
 118       Result : int;
 119       tv     : aliased struct_timeval;
 120
 121       function gettimeofday
 122         (tv : access struct_timeval;
 123          tz : System.Address := System.Null_Address) return int;
 124       pragma Import (C, gettimeofday, "gettimeofday");
 125
 126    begin
 127       Result := gettimeofday (tv'Unchecked_Access);
 128       tp.all := To_Timespec (To_Duration (tv));
 129       return Result;
 130    end clock_gettime;
 131
 132    -----------------
 133    -- sched_yield --
 134    -----------------
 135
 136    --  AIX Thread does not have sched_yield;
 137
 138    function sched_yield return int is
 139
 140       procedure pthread_yield;
 141       pragma Import (C, pthread_yield, "sched_yield");
 142
 143    begin
 144       pthread_yield;
 145       return 0;
 146    end sched_yield;
 147
 148    function Get_Stack_Base (thread : pthread_t) return Address is
 149    begin
 150       return Null_Address;
 151    end Get_Stack_Base;
 152
 153 end System.OS_Interface;