------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . T A S K I N G . R E S T R I C T E D . S T A G E S --
-- --
-- S p e c --
-- --
--- --
--- Copyright (C) 1992-1999, Free Software Foundation, Inc. --
+-- 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 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- 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. 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. --
+-- 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. --
-- --
--- 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. --
+-- 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. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- System.Protected_Objects.Single_Entry
with System.Task_Info;
--- used for Task_Info_Type
-
with System.Parameters;
--- used for Size_Type
package System.Tasking.Restricted.Stages is
pragma Elaborate_Body;
---------------------------------
-- The compiler will expand in the GNAT tree the following construct:
- --
+
-- task type T (Discr : Integer);
- --
+
-- task body T is
-- ...declarations, possibly some controlled...
-- begin
-- ...B...;
-- end T;
- --
+
-- T1 : T (1);
- --
+
-- as follows:
- --
+
-- task type t (discr : integer);
-- tE : aliased boolean := false;
-- tZ : size_type := unspecified_size;
+
-- type tV (discr : integer) is limited record
-- _task_id : task_id;
+ -- _atcb : aliased system__tasking__ada_task_control_block (0);
-- end record;
+
-- procedure tB (_task : access tV);
-- freeze tV [
- -- procedure _init_proc (_init : in out tV; _master : master_id;
- -- _chain : in out activation_chain; _task_id : in task_image_type;
+ -- procedure tVIP (_init : in out tV; _master : master_id;
+ -- _chain : in out activation_chain; _task_name : in string;
-- discr : integer) is
-- begin
-- _init.discr := discr;
-- _init._task_id := null;
+ -- system__tasking__ada_task_control_blockIP (_init._atcb, 0);
+ -- _init._task_id := _init._atcb'unchecked_access;
-- create_restricted_task (unspecified_priority, tZ,
-- unspecified_task_info, task_procedure_access!(tB'address),
- -- _init'address, tE'unchecked_access, _chain, _task_id, _init.
+ -- _init'address, tE'unchecked_access, _chain, _task_name, _init.
-- _task_id);
-- return;
- -- end _init_proc;
- -- ]
- --
+ -- end tVIP;
+
-- _chain : aliased activation_chain;
- -- _init_proc (_chain);
- --
+ -- activation_chainIP (_chain);
+
-- procedure tB (_task : access tV) is
-- discr : integer renames _task.discr;
- --
+
-- procedure _clean is
-- begin
-- complete_restricted_task;
-- finalize_list (F14b);
-- return;
-- end _clean;
+
-- begin
-- ...declarations...
-- complete_restricted_activation;
-- at end
-- _clean;
-- end tB;
- --
+
-- tE := true;
-- t1 : t (1);
- -- t1I : task_image_type := new string'"t1";
- -- _init_proc (t1, 3, _chain, t1I, 1);
- --
+ -- t1S : constant String := "t1";
+ -- tIP (t1, 3, _chain, t1S, 1);
+
-- activate_restricted_tasks (_chain'unchecked_access);
procedure Create_Restricted_Task
(Priority : Integer;
+ Stack_Address : System.Address;
Size : System.Parameters.Size_Type;
Task_Info : System.Task_Info.Task_Info_Type;
State : Task_Procedure_Access;
Discriminants : System.Address;
Elaborated : Access_Boolean;
Chain : in out Activation_Chain;
- Task_Image : System.Task_Info.Task_Image_Type;
- Created_Task : out Task_ID);
+ Task_Image : String;
+ Created_Task : Task_Id);
-- Compiler interface only. Do not call from within the RTS.
-- This must be called to create a new task.
--
-- Priority is the task's priority (assumed to be in the
- -- System.Any_Priority'Range)
+ -- System.Any_Priority'Range)
+ --
+ -- Stack_Address is the start address of the stack associated to the task,
+ -- in case it has been preallocated by the compiler; it is equal to
+ -- Null_Address when the stack needs to be allocated by the underlying
+ -- operating system.
+ --
-- Size is the stack size of the task to create
+ --
-- Task_Info is the task info associated with the created task, or
- -- Unspecified_Task_Info if none.
+ -- Unspecified_Task_Info if none.
+ --
-- State is the compiler generated task's procedure body
- -- Discriminants is a pointer to a limited record whose discriminants
- -- are those of the task to create. This parameter should be passed as
- -- the single argument to State.
+ --
+ -- Discriminants is a pointer to a limited record whose discriminants are
+ -- those of the task to create. This parameter should be passed as the
+ -- single argument to State.
+ --
-- Elaborated is a pointer to a Boolean that must be set to true on exit
- -- if the task could be successfully elaborated.
+ -- if the task could be successfully elaborated.
+ --
-- Chain is a linked list of task that needs to be created. On exit,
- -- Created_Task.Activation_Link will be Chain.T_ID, and Chain.T_ID
- -- will be Created_Task (e.g the created task will be linked at the front
- -- of Chain).
- -- Task_Image is a pointer to a string created by the compiler that the
- -- run time can store to ease the debugging and the
- -- Ada.Task_Identification facility.
+ -- Created_Task.Activation_Link will be Chain.T_ID, and Chain.T_ID will be
+ -- Created_Task (the created task will be linked at the front of Chain).
+ --
+ -- Task_Image is a string created by the compiler that the run time can
+ -- store to ease the debugging and the Ada.Task_Identification facility.
+ --
-- Created_Task is the resulting task.
--
- -- This procedure can raise Storage_Error if the task creation failed.
+ -- This procedure can raise Storage_Error if the task creation fails
procedure Activate_Restricted_Tasks
(Chain_Access : Activation_Chain_Access);
-- version of this procedure had code to reverse the chain, so as to
-- activate the tasks in the order of declaration. This might be nice, but
-- it is not needed if priority-based scheduling is supported, since all
- -- the activated tasks synchronize on the activators lock before they
- -- start activating and so they should start activating in priority order.
+ -- the activated tasks synchronize on the activators lock before they start
+ -- activating and so they should start activating in priority order.
procedure Complete_Restricted_Activation;
- -- Compiler interface only. Do not call from within the RTS.
- -- This should be called from the task body at the end of
- -- the elaboration code for its declarative part.
- -- Decrement the count of tasks to be activated by the activator and
- -- wake it up so it can check to see if all tasks have been activated.
- -- Except for the environment task, which should never call this procedure,
- -- T.Activator should only be null iff T has completed activation.
+ -- Compiler interface only. Do not call from within the RTS. This should be
+ -- called from the task body at the end of the elaboration code for its
+ -- declarative part. Decrement the count of tasks to be activated by the
+ -- activator and wake it up so it can check to see if all tasks have been
+ -- activated. Except for the environment task, which should never call this
+ -- procedure, T.Activator should only be null iff T has completed
+ -- activation.
procedure Complete_Restricted_Task;
- -- Compiler interface only. Do not call from within the RTS.
- -- This should be called from an implicit at-end handler
- -- associated with the task body, when it completes.
- -- From this point, the current task will become not callable.
- -- If the current task have not completed activation, this should be done
- -- now in order to wake up the activator (the environment task).
-
- function Restricted_Terminated (T : Task_ID) return Boolean;
- -- Compiler interface only. Do not call from within the RTS.
- -- This is called by the compiler to implement the 'Terminated attribute.
+ -- Compiler interface only. Do not call from within the RTS. This should be
+ -- called from an implicit at-end handler associated with the task body,
+ -- when it completes. From this point, the current task will become not
+ -- callable. If the current task have not completed activation, this should
+ -- be done now in order to wake up the activator (the environment task).
+
+ function Restricted_Terminated (T : Task_Id) return Boolean;
+ -- Compiler interface only. Do not call from within the RTS. This is called
+ -- by the compiler to implement the 'Terminated attribute.
--
-- source code:
-- T1'Terminated
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