gcc/ada/s-tpopsp-solaris.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) 1992-2007, 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 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, 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 version for Solaris native threads
  35
  36 separate (System.Task_Primitives.Operations)
  37 package body Specific is
  38
  39    ----------------
  40    -- Initialize --
  41    ----------------
  42
  43    procedure Initialize (Environment_Task : Task_Id) is
  44       pragma Unreferenced (Environment_Task);
  45       Result : Interfaces.C.int;
  46    begin
  47       Result := thr_keycreate (ATCB_Key'Access, System.Null_Address);
  48       pragma Assert (Result = 0);
  49    end Initialize;
  50
  51    -------------------
  52    -- Is_Valid_Task --
  53    -------------------
  54
  55    function Is_Valid_Task return Boolean is
  56       Unknown_Task : aliased System.Address;
  57       Result       : Interfaces.C.int;
  58    begin
  59       Result := thr_getspecific (ATCB_Key, Unknown_Task'Unchecked_Access);
  60       pragma Assert (Result = 0);
  61       return Unknown_Task /= System.Null_Address;
  62    end Is_Valid_Task;
  63
  64    ---------
  65    -- Set --
  66    ---------
  67
  68    procedure Set (Self_Id : Task_Id) is
  69       Result : Interfaces.C.int;
  70    begin
  71       Result := thr_setspecific (ATCB_Key, To_Address (Self_Id));
  72       pragma Assert (Result = 0);
  73    end Set;
  74
  75    ----------
  76    -- Self --
  77    ----------
  78
  79    --  To make Ada tasks and C threads interoperate better, we have
  80    --  added some functionality to Self. Suppose a C main program
  81    --  (with threads) calls an Ada procedure and the Ada procedure
  82    --  calls the tasking run-time system. Eventually, a call will be
  83    --  made to self. Since the call is not coming from an Ada task,
  84    --  there will be no corresponding ATCB.
  85
  86    --  What we do in Self is to catch references that do not come
  87    --  from recognized Ada tasks, and create an ATCB for the calling
  88    --  thread.
  89
  90    --  The new ATCB will be "detached" from the normal Ada task
  91    --  master hierarchy, much like the existing implicitly created
  92    --  signal-server tasks.
  93
  94    function Self return Task_Id is
  95       Result  : Interfaces.C.int;
  96       Self_Id : aliased System.Address;
  97    begin
  98       Result := thr_getspecific (ATCB_Key, Self_Id'Unchecked_Access);
  99       pragma Assert (Result = 0);
 100
 101       if Self_Id = System.Null_Address then
 102          return Register_Foreign_Thread;
 103       else
 104          return To_Task_Id (Self_Id);
 105       end if;
 106    end Self;
 107
 108 end Specific;