gcc/ada/7stpopsp.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --                SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC                --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --            Copyright (C) 1991-2001, Florida State University             --
  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. It is --
  30 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  31 -- State University (http://www.gnat.com).                                  --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This is a FSU-like version of this package.
  36
  37 separate (System.Task_Primitives.Operations)
  38 package body Specific is
  39
  40    ------------------
  41    --  Local Data  --
  42    ------------------
  43
  44    --  The followings are logically constants, but need to be initialized
  45    --  at run time.
  46
  47    ATCB_Key : aliased pthread_key_t;
  48    --  Key used to find the Ada Task_ID associated with a thread
  49
  50    ----------------
  51    -- Initialize --
  52    ----------------
  53
  54    procedure Initialize (Environment_Task : Task_ID) is
  55       Result : Interfaces.C.int;
  56    begin
  57       Result := pthread_key_create (ATCB_Key'Access, null);
  58       pragma Assert (Result = 0);
  59       Result := pthread_setspecific (ATCB_Key, To_Address (Environment_Task));
  60       pragma Assert (Result = 0);
  61    end Initialize;
  62
  63    ---------
  64    -- Set --
  65    ---------
  66
  67    procedure Set (Self_Id : Task_ID) is
  68       Result : Interfaces.C.int;
  69
  70    begin
  71       Result := pthread_setspecific (ATCB_Key, To_Address (Self_Id));
  72       pragma Assert (Result = 0);
  73    end Set;
  74
  75    ----------
  76    -- Self --
  77    ----------
  78
  79    function Self return Task_ID is
  80       Result : System.Address;
  81
  82    begin
  83       Result := pthread_getspecific (ATCB_Key);
  84       pragma Assert (Result /= System.Null_Address);
  85       return To_Task_ID (Result);
  86    end Self;
  87
  88 end Specific;