gcc/ada/libgnarl/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) 1992-2020, 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 version for Solaris native threads
  33
  34 separate (System.Task_Primitives.Operations)
  35 package body Specific is
  36
  37    ----------------
  38    -- Initialize --
  39    ----------------
  40
  41    procedure Initialize (Environment_Task : Task_Id) is
  42       pragma Unreferenced (Environment_Task);
  43       Result : Interfaces.C.int;
  44    begin
  45       Result := thr_keycreate (ATCB_Key'Access, System.Null_Address);
  46       pragma Assert (Result = 0);
  47    end Initialize;
  48
  49    -------------------
  50    -- Is_Valid_Task --
  51    -------------------
  52
  53    function Is_Valid_Task return Boolean is
  54       Unknown_Task : aliased System.Address;
  55       Result       : Interfaces.C.int;
  56    begin
  57       Result := thr_getspecific (ATCB_Key, Unknown_Task'Unchecked_Access);
  58       pragma Assert (Result = 0);
  59       return Unknown_Task /= System.Null_Address;
  60    end Is_Valid_Task;
  61
  62    ---------
  63    -- Set --
  64    ---------
  65
  66    procedure Set (Self_Id : Task_Id) is
  67       Result : Interfaces.C.int;
  68    begin
  69       Result := thr_setspecific (ATCB_Key, To_Address (Self_Id));
  70       pragma Assert (Result = 0);
  71    end Set;
  72
  73    ----------
  74    -- Self --
  75    ----------
  76
  77    --  To make Ada tasks and C threads interoperate better, we have
  78    --  added some functionality to Self. Suppose a C main program
  79    --  (with threads) calls an Ada procedure and the Ada procedure
  80    --  calls the tasking run-time system. Eventually, a call will be
  81    --  made to self. Since the call is not coming from an Ada task,
  82    --  there will be no corresponding ATCB.
  83
  84    --  What we do in Self is to catch references that do not come
  85    --  from recognized Ada tasks, and create an ATCB for the calling
  86    --  thread.
  87
  88    --  The new ATCB will be "detached" from the normal Ada task
  89    --  master hierarchy, much like the existing implicitly created
  90    --  signal-server tasks.
  91
  92    function Self return Task_Id is
  93       Result  : Interfaces.C.int;
  94       Self_Id : aliased System.Address;
  95    begin
  96       Result := thr_getspecific (ATCB_Key, Self_Id'Unchecked_Access);
  97       pragma Assert (Result = 0);
  98
  99       if Self_Id = System.Null_Address then
 100          return Register_Foreign_Thread;
 101       else
 102          return To_Task_Id (Self_Id);
 103       end if;
 104    end Self;
 105
 106 end Specific;