gcc/ada/s-osinte-lynxos.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) 2001-2002 Ada Core Technologies, 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 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 with Interfaces.C;
  41
  42 package body System.OS_Interface is
  43
  44    use Interfaces.C;
  45
  46    -----------------
  47    -- To_Duration --
  48    -----------------
  49
  50    function To_Duration (TS : timespec) return Duration is
  51    begin
  52       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  53    end To_Duration;
  54
  55    function To_Duration (TV : struct_timeval) return Duration is
  56    begin
  57       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  58    end To_Duration;
  59
  60    -----------------
  61    -- To_Timespec --
  62    -----------------
  63
  64    function To_Timespec (D : Duration) return timespec is
  65       S : time_t;
  66       F : Duration;
  67
  68    begin
  69       S := time_t (Long_Long_Integer (D));
  70       F := D - Duration (S);
  71
  72       --  If F has negative value due to a round-up, adjust for positive F
  73       --  value.
  74
  75       if F < 0.0 then
  76          S := S - 1;
  77          F := F + 1.0;
  78       end if;
  79
  80       return timespec'(tv_sec => S,
  81                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  82    end To_Timespec;
  83
  84    ----------------
  85    -- To_Timeval --
  86    ----------------
  87
  88    function To_Timeval (D : Duration) return struct_timeval is
  89       S : time_t;
  90       F : Duration;
  91
  92    begin
  93       S := time_t (Long_Long_Integer (D));
  94       F := D - Duration (S);
  95
  96       --  If F has negative value due to a round-up, adjust for positive F
  97       --  value.
  98
  99       if F < 0.0 then
 100          S := S - 1;
 101          F := F + 1.0;
 102       end if;
 103
 104       return
 105         struct_timeval'
 106           (tv_sec => S,
 107            tv_usec => time_t (Long_Long_Integer (F * 10#1#E6)));
 108    end To_Timeval;
 109
 110    -------------
 111    -- sigwait --
 112    -------------
 113
 114    function sigwait
 115      (set :  access sigset_t;
 116       sig :  access Signal)
 117       return int
 118    is
 119       function sigwaitinfo
 120         (set   : access sigset_t;
 121          info  : System.Address) return Signal;
 122       pragma Import (C, sigwaitinfo, "sigwaitinfo");
 123
 124    begin
 125       sig.all := sigwaitinfo (set, Null_Address);
 126
 127       if sig.all = -1 then
 128          return errno;
 129       end if;
 130
 131       return 0;
 132    end sigwait;
 133
 134    --------------------
 135    -- Get_Stack_Base --
 136    --------------------
 137
 138    function Get_Stack_Base (thread : pthread_t) return Address is
 139       pragma Warnings (Off, thread);
 140
 141    begin
 142       return Null_Address;
 143    end Get_Stack_Base;
 144
 145    ------------------
 146    -- pthread_init --
 147    ------------------
 148
 149    procedure pthread_init is
 150    begin
 151       null;
 152    end pthread_init;
 153
 154 end System.OS_Interface;