gcc/ada/libgnarl/s-osinte__gnu.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT 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) 2015-2016, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT 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 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT 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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University.       --
  28 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This is the GNU/Hurd version of this package.
  33
  34 pragma Polling (Off);
  35 --  Turn off polling, we do not want ATC polling to take place during
  36 --  tasking operations. It causes infinite loops and other problems.
  37
  38 --  This package encapsulates all direct interfaces to OS services
  39 --  that are needed by children of System.
  40
  41 package body System.OS_Interface is
  42
  43    --------------------
  44    -- Get_Stack_Base --
  45    --------------------
  46
  47    function Get_Stack_Base (thread : pthread_t) return Address is
  48       pragma Warnings (Off, thread);
  49
  50    begin
  51       return Null_Address;
  52    end Get_Stack_Base;
  53
  54    ------------------
  55    -- pthread_init --
  56    ------------------
  57
  58    procedure pthread_init is
  59    begin
  60       null;
  61    end pthread_init;
  62
  63    --------------------------------------
  64    -- pthread_mutexattr_setprioceiling --
  65    --------------------------------------
  66
  67    function pthread_mutexattr_setprioceiling
  68      (attr     : access pthread_mutexattr_t;
  69       prioceiling : int) return int is
  70       pragma Unreferenced (attr, prioceiling);
  71    begin
  72       return 0;
  73    end pthread_mutexattr_setprioceiling;
  74
  75    --------------------------------------
  76    -- pthread_mutexattr_getprioceiling --
  77    --------------------------------------
  78
  79    function pthread_mutexattr_getprioceiling
  80      (attr     : access pthread_mutexattr_t;
  81       prioceiling : access int) return int is
  82       pragma Unreferenced (attr, prioceiling);
  83    begin
  84       return 0;
  85    end pthread_mutexattr_getprioceiling;
  86
  87    ---------------------------
  88    -- pthread_setschedparam --
  89    ---------------------------
  90
  91    function pthread_setschedparam
  92      (thread : pthread_t;
  93       policy : int;
  94       param : access struct_sched_param) return int is
  95       pragma Unreferenced (thread, policy, param);
  96    begin
  97       return 0;
  98    end pthread_setschedparam;
  99
 100    -----------------
 101    -- To_Duration --
 102    -----------------
 103
 104    function To_Duration (TS : timespec) return Duration is
 105    begin
 106       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
 107    end To_Duration;
 108
 109    ------------------------
 110    -- To_Target_Priority --
 111    ------------------------
 112
 113    function To_Target_Priority
 114      (Prio : System.Any_Priority) return Interfaces.C.int
 115    is
 116    begin
 117       return Interfaces.C.int (Prio);
 118    end To_Target_Priority;
 119
 120    -----------------
 121    -- To_Timespec --
 122    -----------------
 123
 124    function To_Timespec (D : Duration) return timespec is
 125       S : time_t;
 126       F : Duration;
 127
 128    begin
 129       S := time_t (Long_Long_Integer (D));
 130       F := D - Duration (S);
 131
 132       --  If F has negative value due to a round-up, adjust for positive F
 133       --  value.
 134
 135       if F < 0.0 then
 136          S := S - 1;
 137          F := F + 1.0;
 138       end if;
 139
 140       return timespec'(tv_sec => S,
 141                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 142    end To_Timespec;
 143
 144 end System.OS_Interface;