gcc/ada/s-tpopsp-solaris.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) 1992-2004, 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,  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.       --
  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       Result : Interfaces.C.int;
  45    begin
  46       Result := thr_setspecific (ATCB_Key, To_Address (Environment_Task));
  47       pragma Assert (Result = 0);
  48    end Initialize;
  49
  50    -------------------
  51    -- Is_Valid_Task --
  52    -------------------
  53
  54    function Is_Valid_Task return Boolean is
  55       Unknown_Task : aliased System.Address;
  56       Result       : Interfaces.C.int;
  57    begin
  58       Result := thr_getspecific (ATCB_Key, Unknown_Task'Unchecked_Access);
  59       pragma Assert (Result = 0);
  60       return Unknown_Task /= System.Null_Address;
  61    end Is_Valid_Task;
  62
  63    ---------
  64    -- Set --
  65    ---------
  66
  67    procedure Set (Self_Id : Task_Id) is
  68       Result : Interfaces.C.int;
  69    begin
  70       Result := thr_setspecific (ATCB_Key, To_Address (Self_Id));
  71       pragma Assert (Result = 0);
  72    end Set;
  73
  74    ----------
  75    -- Self --
  76    ----------
  77
  78    --  To make Ada tasks and C threads interoperate better, we have
  79    --  added some functionality to Self. Suppose a C main program
  80    --  (with threads) calls an Ada procedure and the Ada procedure
  81    --  calls the tasking run-time system. Eventually, a call will be
  82    --  made to self. Since the call is not coming from an Ada task,
  83    --  there will be no corresponding ATCB.
  84
  85    --  What we do in Self is to catch references that do not come
  86    --  from recognized Ada tasks, and create an ATCB for the calling
  87    --  thread.
  88
  89    --  The new ATCB will be "detached" from the normal Ada task
  90    --  master hierarchy, much like the existing implicitly created
  91    --  signal-server tasks.
  92
  93    function Self return Task_Id is
  94       Result  : Interfaces.C.int;
  95       Self_Id : aliased System.Address;
  96    begin
  97       Result := thr_getspecific (ATCB_Key, Self_Id'Unchecked_Access);
  98       pragma Assert (Result = 0);
  99
 100       if Self_Id = System.Null_Address then
 101          return Register_Foreign_Thread;
 102       else
 103          return To_Task_Id (Self_Id);
 104       end if;
 105    end Self;
 106
 107 end Specific;