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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [gcc/] [ada/] [s-taskin.adb] - Rev 593
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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . T A S K I N G -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2009, 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. -- -- -- ------------------------------------------------------------------------------ pragma Polling (Off); -- Turn off polling, we do not want ATC polling to take place during tasking -- operations. It causes infinite loops and other problems. with Ada.Unchecked_Deallocation; with System.Task_Primitives.Operations; with System.Storage_Elements; package body System.Tasking is package STPO renames System.Task_Primitives.Operations; ---------------------------- -- Free_Entry_Names_Array -- ---------------------------- procedure Free_Entry_Names_Array (Obj : in out Entry_Names_Array) is procedure Free_String is new Ada.Unchecked_Deallocation (String, String_Access); begin for Index in Obj'Range loop Free_String (Obj (Index)); end loop; end Free_Entry_Names_Array; --------------------- -- Detect_Blocking -- --------------------- function Detect_Blocking return Boolean is GL_Detect_Blocking : Integer; pragma Import (C, GL_Detect_Blocking, "__gl_detect_blocking"); -- Global variable exported by the binder generated file. A value equal -- to 1 indicates that pragma Detect_Blocking is active, while 0 is used -- for the pragma not being present. begin return GL_Detect_Blocking = 1; end Detect_Blocking; ---------- -- Self -- ---------- function Self return Task_Id renames STPO.Self; ------------------ -- Storage_Size -- ------------------ function Storage_Size (T : Task_Id) return System.Parameters.Size_Type is begin return System.Parameters.Size_Type (T.Common.Compiler_Data.Pri_Stack_Info.Size); end Storage_Size; --------------------- -- Initialize_ATCB -- --------------------- procedure Initialize_ATCB (Self_ID : Task_Id; Task_Entry_Point : Task_Procedure_Access; Task_Arg : System.Address; Parent : Task_Id; Elaborated : Access_Boolean; Base_Priority : System.Any_Priority; Task_Info : System.Task_Info.Task_Info_Type; Stack_Size : System.Parameters.Size_Type; T : Task_Id; Success : out Boolean) is begin T.Common.State := Unactivated; -- Initialize T.Common.LL STPO.Initialize_TCB (T, Success); if not Success then return; end if; -- Wouldn't the following be better done using an assignment of an -- aggregate so that we could be sure no components were forgotten??? T.Common.Parent := Parent; T.Common.Base_Priority := Base_Priority; T.Common.Current_Priority := 0; T.Common.Protected_Action_Nesting := 0; T.Common.Call := null; T.Common.Task_Arg := Task_Arg; T.Common.Task_Entry_Point := Task_Entry_Point; T.Common.Activator := Self_ID; T.Common.Wait_Count := 0; T.Common.Elaborated := Elaborated; T.Common.Activation_Failed := False; T.Common.Task_Info := Task_Info; T.Common.Global_Task_Lock_Nesting := 0; T.Common.Fall_Back_Handler := null; T.Common.Specific_Handler := null; T.Common.Debug_Events := (others => False); if T.Common.Parent = null then -- For the environment task, the adjusted stack size is meaningless. -- For example, an unspecified Stack_Size means that the stack size -- is determined by the environment, or can grow dynamically. The -- Stack_Checking algorithm therefore needs to use the requested -- size, or 0 in case of an unknown size. T.Common.Compiler_Data.Pri_Stack_Info.Size := Storage_Elements.Storage_Offset (Stack_Size); else T.Common.Compiler_Data.Pri_Stack_Info.Size := Storage_Elements.Storage_Offset (Parameters.Adjust_Storage_Size (Stack_Size)); end if; -- Link the task into the list of all tasks T.Common.All_Tasks_Link := All_Tasks_List; All_Tasks_List := T; end Initialize_ATCB; ---------------- -- Initialize -- ---------------- Main_Task_Image : constant String := "main_task"; -- Image of environment task Main_Priority : Integer; pragma Import (C, Main_Priority, "__gl_main_priority"); -- Priority for main task. Note that this is of type Integer, not Priority, -- because we use the value -1 to indicate the default main priority, and -- that is of course not in Priority'range. Initialized : Boolean := False; -- Used to prevent multiple calls to Initialize procedure Initialize is T : Task_Id; Base_Priority : Any_Priority; Success : Boolean; begin if Initialized then return; end if; Initialized := True; -- Initialize Environment Task Base_Priority := (if Main_Priority = Unspecified_Priority then Default_Priority else Priority (Main_Priority)); T := STPO.New_ATCB (0); Initialize_ATCB (null, null, Null_Address, Null_Task, null, Base_Priority, Task_Info.Unspecified_Task_Info, 0, T, Success); pragma Assert (Success); STPO.Initialize (T); STPO.Set_Priority (T, T.Common.Base_Priority); T.Common.State := Runnable; T.Common.Task_Image_Len := Main_Task_Image'Length; T.Common.Task_Image (Main_Task_Image'Range) := Main_Task_Image; -- Only initialize the first element since others are not relevant -- in ravenscar mode. Rest of the initialization is done in Init_RTS. T.Entry_Calls (1).Self := T; end Initialize; end System.Tasking;
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