aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.3.1/gcc/ada/s-taskin.adb
diff options
context:
space:
mode:
Diffstat (limited to 'gcc-4.3.1/gcc/ada/s-taskin.adb')
-rw-r--r--gcc-4.3.1/gcc/ada/s-taskin.adb202
1 files changed, 202 insertions, 0 deletions
diff --git a/gcc-4.3.1/gcc/ada/s-taskin.adb b/gcc-4.3.1/gcc/ada/s-taskin.adb
new file mode 100644
index 000000000..3a4cbe559
--- /dev/null
+++ b/gcc-4.3.1/gcc/ada/s-taskin.adb
@@ -0,0 +1,202 @@
+------------------------------------------------------------------------------
+-- --
+-- 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) 1992-2007, 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, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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. --
+-- --
+------------------------------------------------------------------------------
+
+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 System.Task_Primitives.Operations;
+-- used for Self
+
+with System.Storage_Elements;
+-- Needed for initializing Stack_Info.Size
+
+package body System.Tasking is
+
+ package STPO renames System.Task_Primitives.Operations;
+
+ ---------------------
+ -- 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;