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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- --
+-- SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
+-- --
+-- GNARL is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is a POSIX version of this package where foreign threads are
+-- recognized.
+
+separate (System.Task_Primitives.Operations)
+package body Specific is
+
+ ATCB_Key : aliased pthread_key_t;
+ -- Key used to find the Ada Task_Id associated with a thread
+
+ ----------------
+ -- Initialize --
+ ----------------
+
+ procedure Initialize (Environment_Task : Task_Id) is
+ pragma Warnings (Off, Environment_Task);
+ Result : Interfaces.C.int;
+
+ begin
+ Result := pthread_key_create (ATCB_Key'Access, null);
+ pragma Assert (Result = 0);
+ end Initialize;
+
+ -------------------
+ -- Is_Valid_Task --
+ -------------------
+
+ function Is_Valid_Task return Boolean is
+ begin
+ return pthread_getspecific (ATCB_Key) /= System.Null_Address;
+ end Is_Valid_Task;
+
+ ---------
+ -- Set --
+ ---------
+
+ procedure Set (Self_Id : Task_Id) is
+ Result : Interfaces.C.int;
+ begin
+ Result := pthread_setspecific (ATCB_Key, To_Address (Self_Id));
+ pragma Assert (Result = 0);
+ end Set;
+
+ ----------
+ -- Self --
+ ----------
+
+ -- To make Ada tasks and C threads interoperate better, we have added some
+ -- functionality to Self. Suppose a C main program (with threads) calls an
+ -- Ada procedure and the Ada procedure calls the tasking runtime system.
+ -- Eventually, a call will be made to self. Since the call is not coming
+ -- from an Ada task, there will be no corresponding ATCB.
+
+ -- What we do in Self is to catch references that do not come from
+ -- recognized Ada tasks, and create an ATCB for the calling thread.
+
+ -- The new ATCB will be "detached" from the normal Ada task master
+ -- hierarchy, much like the existing implicitly created signal-server
+ -- tasks.
+
+ function Self return Task_Id is
+ Result : System.Address;
+
+ begin
+ Result := pthread_getspecific (ATCB_Key);
+
+ -- If the key value is Null then it is a non-Ada task
+
+ if Result /= System.Null_Address then
+ return To_Task_Id (Result);
+ else
+ return Register_Foreign_Thread;
+ end if;
+ end Self;
+
+end Specific;