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Diffstat (limited to 'gcc-4.4.3/gcc/ada/s-tporft.adb')
| -rw-r--r-- | gcc-4.4.3/gcc/ada/s-tporft.adb | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/gcc-4.4.3/gcc/ada/s-tporft.adb b/gcc-4.4.3/gcc/ada/s-tporft.adb new file mode 100644 index 000000000..f2cfd65de --- /dev/null +++ b/gcc-4.4.3/gcc/ada/s-tporft.adb @@ -0,0 +1,105 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- SYSTEM.TASK_PRIMITIVES.OPERATIONS.REGISTER_FOREIGN_THREAD -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 2002-2009, 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. -- +-- -- +------------------------------------------------------------------------------ + +with System.Task_Info; +-- Use for Unspecified_Task_Info + +with System.Soft_Links; +-- used to initialize TSD for a C thread, in function Self + +separate (System.Task_Primitives.Operations) +function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id is + Local_ATCB : aliased Ada_Task_Control_Block (0); + Self_Id : Task_Id; + Succeeded : Boolean; + +begin + -- This section is tricky. We must not call anything that might require + -- an ATCB, until the new ATCB is in place. In order to get an ATCB + -- immediately, we fake one, so that it is then possible to e.g allocate + -- memory (which might require accessing self). + + -- Record this as the Task_Id for the thread + + Local_ATCB.Common.LL.Thread := Thread; + Local_ATCB.Common.Current_Priority := System.Priority'First; + Specific.Set (Local_ATCB'Unchecked_Access); + + -- It is now safe to use an allocator + + Self_Id := new Ada_Task_Control_Block (0); + + -- Finish initialization + + Lock_RTS; + System.Tasking.Initialize_ATCB + (Self_Id, null, Null_Address, Null_Task, + Foreign_Task_Elaborated'Access, + System.Priority'First, Task_Info.Unspecified_Task_Info, 0, Self_Id, + Succeeded); + Unlock_RTS; + pragma Assert (Succeeded); + + Self_Id.Master_of_Task := 0; + Self_Id.Master_Within := Self_Id.Master_of_Task + 1; + + for L in Self_Id.Entry_Calls'Range loop + Self_Id.Entry_Calls (L).Self := Self_Id; + Self_Id.Entry_Calls (L).Level := L; + end loop; + + Self_Id.Common.State := Runnable; + Self_Id.Awake_Count := 1; + + Self_Id.Common.Task_Image (1 .. 14) := "foreign thread"; + Self_Id.Common.Task_Image_Len := 14; + + -- Since this is not an ordinary Ada task, we will start out undeferred + + Self_Id.Deferral_Level := 0; + + System.Soft_Links.Create_TSD (Self_Id.Common.Compiler_Data); + + -- ??? + -- The following call is commented out to avoid dependence on + -- the System.Tasking.Initialization package. + -- It seems that if we want Ada.Task_Attributes to work correctly + -- for C threads we will need to raise the visibility of this soft + -- link to System.Soft_Links. + -- We are putting that off until this new functionality is otherwise + -- stable. + + -- System.Tasking.Initialization.Initialize_Attributes_Link.all (T); + + Enter_Task (Self_Id); + + return Self_Id; +end Register_Foreign_Thread; |