gcc/ada/s-tpopsp-posix.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --                SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC                --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2011, 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 POSIX-like version of this package
  33
  34 separate (System.Task_Primitives.Operations)
  35 package body Specific is
  36
  37    ATCB_Key : aliased pthread_key_t;
  38    --  Key used to find the Ada Task_Id associated with a thread
  39
  40    ----------------
  41    -- Initialize --
  42    ----------------
  43
  44    procedure Initialize (Environment_Task : Task_Id) is
  45       pragma Warnings (Off, Environment_Task);
  46       Result : Interfaces.C.int;
  47    begin
  48       Result := pthread_key_create (ATCB_Key'Access, null);
  49       pragma Assert (Result = 0);
  50    end Initialize;
  51
  52    -------------------
  53    -- Is_Valid_Task --
  54    -------------------
  55
  56    function Is_Valid_Task return Boolean is
  57    begin
  58       return  pthread_getspecific (ATCB_Key) /= System.Null_Address;
  59    end Is_Valid_Task;
  60
  61    ---------
  62    -- Set --
  63    ---------
  64
  65    procedure Set (Self_Id : Task_Id) is
  66       Result : Interfaces.C.int;
  67    begin
  68       Result := pthread_setspecific (ATCB_Key, To_Address (Self_Id));
  69       pragma Assert (Result = 0);
  70    end Set;
  71
  72    ----------
  73    -- Self --
  74    ----------
  75
  76    function Self return Task_Id is
  77    begin
  78       return To_Task_Id (pthread_getspecific (ATCB_Key));
  79    end Self;
  80
  81 end Specific;