gcc/ada/s-osinte-aix.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) 1997-2009, 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 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 a AIX (Native) version of this package
  33
  34 pragma Polling (Off);
  35 --  Turn off polling, we do not want ATC polling to take place during tasking
  36 --  operations. It causes infinite loops and other problems.
  37
  38 package body System.OS_Interface is
  39
  40    use Interfaces.C;
  41
  42    -----------------
  43    -- To_Duration --
  44    -----------------
  45
  46    function To_Duration (TS : timespec) return Duration is
  47    begin
  48       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  49    end To_Duration;
  50
  51    function To_Duration (TV : struct_timeval) return Duration is
  52    begin
  53       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  54    end To_Duration;
  55
  56    ------------------------
  57    -- To_Target_Priority --
  58    ------------------------
  59
  60    function To_Target_Priority
  61      (Prio : System.Any_Priority) return Interfaces.C.int
  62    is
  63       Dispatching_Policy : Character;
  64       pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
  65
  66       Time_Slice_Val : Integer;
  67       pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
  68
  69    begin
  70       --  For the case SCHED_OTHER the only valid priority across all supported
  71       --  versions of AIX is 1 (note that the scheduling policy can be set
  72       --  with the pragma Task_Dispatching_Policy or setting the time slice
  73       --  value). Otherwise, for SCHED_RR and SCHED_FIFO, the system defines
  74       --  priorities in the range 1 .. 127. This means that we must map
  75       --  System.Any_Priority in the range 0 .. 126 to 1 .. 127.
  76
  77       if Dispatching_Policy = ' ' and then Time_Slice_Val < 0 then
  78          return 1;
  79       else
  80          return Interfaces.C.int (Prio) + 1;
  81       end if;
  82    end To_Target_Priority;
  83
  84    -----------------
  85    -- To_Timespec --
  86    -----------------
  87
  88    function To_Timespec (D : Duration) return timespec 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 is negative due to a round-up, adjust for positive F value
  97
  98       if F < 0.0 then
  99          S := S - 1;
 100          F := F + 1.0;
 101       end if;
 102
 103       return timespec'(tv_sec => S,
 104                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 105    end To_Timespec;
 106
 107    ----------------
 108    -- To_Timeval --
 109    ----------------
 110
 111    function To_Timeval (D : Duration) return struct_timeval is
 112       S : long;
 113       F : Duration;
 114
 115    begin
 116       S := long (Long_Long_Integer (D));
 117       F := D - Duration (S);
 118
 119       --  If F is negative due to a round-up, adjust for positive F value
 120
 121       if F < 0.0 then
 122          S := S - 1;
 123          F := F + 1.0;
 124       end if;
 125
 126       return
 127         struct_timeval'
 128           (tv_sec => S,
 129            tv_usec => long (Long_Long_Integer (F * 10#1#E6)));
 130    end To_Timeval;
 131
 132    -------------------
 133    -- clock_gettime --
 134    -------------------
 135
 136    function clock_gettime
 137      (clock_id : clockid_t;
 138       tp       : access timespec)
 139       return     int
 140    is
 141       pragma Warnings (Off, clock_id);
 142
 143       Result : int;
 144       tv     : aliased struct_timeval;
 145
 146       function gettimeofday
 147         (tv   : access struct_timeval;
 148          tz   : System.Address := System.Null_Address)
 149          return int;
 150       pragma Import (C, gettimeofday, "gettimeofday");
 151
 152    begin
 153       Result := gettimeofday (tv'Unchecked_Access);
 154       tp.all := To_Timespec (To_Duration (tv));
 155       return Result;
 156    end clock_gettime;
 157
 158    -----------------
 159    -- sched_yield --
 160    -----------------
 161
 162    --  AIX Thread does not have sched_yield;
 163
 164    function sched_yield return int is
 165       procedure pthread_yield;
 166       pragma Import (C, pthread_yield, "sched_yield");
 167    begin
 168       pthread_yield;
 169       return 0;
 170    end sched_yield;
 171
 172    --------------------
 173    -- Get_Stack_Base --
 174    --------------------
 175
 176    function Get_Stack_Base (thread : pthread_t) return Address is
 177       pragma Warnings (Off, thread);
 178    begin
 179       return Null_Address;
 180    end Get_Stack_Base;
 181
 182    --------------------------
 183    -- PTHREAD_PRIO_INHERIT --
 184    --------------------------
 185
 186    AIX_Version : Integer := 0;
 187    --  AIX version in the form xy for AIX version x.y (0 means not set)
 188
 189    SYS_NMLN : constant := 32;
 190    --  AIX system constant used to define utsname, see sys/utsname.h
 191
 192    subtype String_NMLN is String (1 .. SYS_NMLN);
 193
 194    type utsname is record
 195       sysname    : String_NMLN;
 196       nodename   : String_NMLN;
 197       release    : String_NMLN;
 198       version    : String_NMLN;
 199       machine    : String_NMLN;
 200       procserial : String_NMLN;
 201    end record;
 202    pragma Convention (C, utsname);
 203
 204    procedure uname (name : out utsname);
 205    pragma Import (C, uname);
 206
 207    function PTHREAD_PRIO_INHERIT return int is
 208       name : utsname;
 209
 210       function Val (C : Character) return Integer;
 211       --  Transform a numeric character ('0' .. '9') to an integer
 212
 213       ---------
 214       -- Val --
 215       ---------
 216
 217       function Val (C : Character) return Integer is
 218       begin
 219          return Character'Pos (C) - Character'Pos ('0');
 220       end Val;
 221
 222    --  Start of processing for PTHREAD_PRIO_INHERIT
 223
 224    begin
 225       if AIX_Version = 0 then
 226
 227          --  Set AIX_Version
 228
 229          uname (name);
 230          AIX_Version := Val (name.version (1)) * 10 + Val (name.release (1));
 231       end if;
 232
 233       if AIX_Version < 53 then
 234
 235          --  Under AIX < 5.3, PTHREAD_PRIO_INHERIT is defined as 0 in pthread.h
 236
 237          return 0;
 238
 239       else
 240          --  Under AIX >= 5.3, PTHREAD_PRIO_INHERIT is defined as 3
 241
 242          return 3;
 243       end if;
 244    end PTHREAD_PRIO_INHERIT;
 245
 246 end System.OS_Interface;