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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;
-
- 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;
-
- 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;
- pragma Warnings (Off, Success);
-
- begin
- if Initialized then
- return;
- end if;
-
- Initialized := True;
-
- -- Initialize Environment Task
-
- if Main_Priority = Unspecified_Priority then
- Base_Priority := Default_Priority;
- else
- Base_Priority := Priority (Main_Priority);
- end if;
-
- Success := True;
- 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;