202 lines
6.7 KiB
Ada
202 lines
6.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- G N A T . T H R E A D S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1998-2020, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Ada.Task_Identification; use Ada.Task_Identification;
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with System.Task_Primitives.Operations;
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with System.Tasking;
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with System.Tasking.Stages; use System.Tasking.Stages;
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with System.Tasking.Utilities;
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with System.OS_Interface; use System.OS_Interface;
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with System.Soft_Links; use System.Soft_Links;
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with Ada.Unchecked_Conversion;
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package body GNAT.Threads is
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use System;
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package STPO renames System.Task_Primitives.Operations;
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type Thread_Id_Ptr is access all Thread_Id;
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pragma Warnings (Off);
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-- The following unchecked conversions are aliasing safe, since they
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-- are never used to create pointers to improperly aliased data.
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function To_Addr is new Ada.Unchecked_Conversion (Task_Id, Address);
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function To_Id is new Ada.Unchecked_Conversion (Address, Task_Id);
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function To_Id is new Ada.Unchecked_Conversion (Address, Tasking.Task_Id);
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function To_Tid is new Ada.Unchecked_Conversion
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(Address, Ada.Task_Identification.Task_Id);
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function To_Thread is new Ada.Unchecked_Conversion (Address, Thread_Id_Ptr);
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pragma Warnings (On);
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type Code_Proc is access procedure (Id : Address; Parm : Void_Ptr);
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task type Thread
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(Stsz : Natural;
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Prio : Any_Priority;
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Parm : Void_Ptr;
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Code : Code_Proc)
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is
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pragma Priority (Prio);
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pragma Storage_Size (Stsz);
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end Thread;
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task body Thread is
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begin
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Code.all (To_Addr (Current_Task), Parm);
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end Thread;
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type Tptr is access Thread;
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-------------------
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-- Create_Thread --
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-------------------
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function Create_Thread
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(Code : Address;
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Parm : Void_Ptr;
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Size : Natural;
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Prio : Integer) return System.Address
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is
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TP : Tptr;
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function To_CP is new Ada.Unchecked_Conversion (Address, Code_Proc);
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begin
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TP := new Thread (Size, Prio, Parm, To_CP (Code));
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return To_Addr (TP'Identity);
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end Create_Thread;
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---------------------
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-- Register_Thread --
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---------------------
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function Register_Thread return System.Address is
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begin
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return Task_Primitives.Operations.Register_Foreign_Thread.all'Address;
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end Register_Thread;
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-----------------------
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-- Unregister_Thread --
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-----------------------
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procedure Unregister_Thread is
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Self_Id : constant Tasking.Task_Id := Task_Primitives.Operations.Self;
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begin
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Self_Id.Common.State := Tasking.Terminated;
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Destroy_TSD (Self_Id.Common.Compiler_Data);
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Free_Task (Self_Id);
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end Unregister_Thread;
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--------------------------
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-- Unregister_Thread_Id --
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--------------------------
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procedure Unregister_Thread_Id (Thread : System.Address) is
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Thr : constant Thread_Id := To_Thread (Thread).all;
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T : Tasking.Task_Id;
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use type Tasking.Task_Id;
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-- This use clause should be removed once a visibility problem
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-- with the MaRTE run time has been fixed. ???
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pragma Warnings (Off);
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use type System.OS_Interface.Thread_Id;
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pragma Warnings (On);
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begin
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STPO.Lock_RTS;
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T := Tasking.All_Tasks_List;
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loop
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exit when T = null or else STPO.Get_Thread_Id (T) = Thr;
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T := T.Common.All_Tasks_Link;
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end loop;
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STPO.Unlock_RTS;
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if T /= null then
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T.Common.State := Tasking.Terminated;
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Destroy_TSD (T.Common.Compiler_Data);
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Free_Task (T);
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end if;
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end Unregister_Thread_Id;
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--------------------
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-- Destroy_Thread --
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--------------------
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procedure Destroy_Thread (Id : Address) is
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Tid : constant Task_Id := To_Id (Id);
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begin
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Abort_Task (Tid);
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end Destroy_Thread;
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----------------
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-- Get_Thread --
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----------------
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procedure Get_Thread (Id : Address; Thread : Address) is
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begin
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To_Thread (Thread).all :=
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Task_Primitives.Operations.Get_Thread_Id (To_Id (Id));
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end Get_Thread;
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procedure Get_Thread (Id : Task_Id; Thread : Address) is
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begin
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Get_Thread (To_Addr (Id), Thread);
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end Get_Thread;
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----------------------
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-- Make_Independent --
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----------------------
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function Make_Independent return Boolean is
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begin
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return System.Tasking.Utilities.Make_Independent;
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end Make_Independent;
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----------------
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-- To_Task_Id --
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----------------
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function To_Task_Id
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(Id : System.Address) return Ada.Task_Identification.Task_Id
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is
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begin
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return To_Tid (Id);
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end To_Task_Id;
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end GNAT.Threads;
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