| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- |
| -- -- |
| -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2003, 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 2, or (at your option) any later ver- -- |
| -- sion. GNARL 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNARL; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- 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. |
| |
| -- Currently, DEC Unix, SCO UnixWare, Solaris pthread, HPUX pthread, |
| -- GNU/Linux threads, and RTEMS use this version. |
| |
| separate (System.Task_Primitives.Operations) |
| package body Specific is |
| |
| ---------------- |
| -- 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; |
