117 lines
5.4 KiB
Ada
117 lines
5.4 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
|
|
-- --
|
|
-- S Y S T E M . T A S K _ P R I M I T I V E S --
|
|
-- --
|
|
-- S p e c --
|
|
-- --
|
|
-- Copyright (C) 1991-2005 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. --
|
|
-- --
|
|
------------------------------------------------------------------------------
|
|
|
|
-- This is a NT (native) version of this package
|
|
|
|
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.OS_Interface;
|
|
-- used for pthread_mutex_t
|
|
-- pthread_cond_t
|
|
-- pthread_t
|
|
|
|
package System.Task_Primitives is
|
|
pragma Preelaborate;
|
|
|
|
type Lock is limited private;
|
|
-- Should be used for implementation of protected objects
|
|
|
|
type RTS_Lock is limited private;
|
|
-- Should be used inside the runtime system. The difference between Lock
|
|
-- and the RTS_Lock is that the later one serves only as a semaphore so
|
|
-- that do not check for ceiling violations.
|
|
|
|
type Suspension_Object is limited private;
|
|
-- Should be used for the implementation of Ada.Synchronous_Task_Control
|
|
|
|
type Task_Body_Access is access procedure;
|
|
-- Pointer to the task body's entry point (or possibly a wrapper
|
|
-- declared local to the GNARL).
|
|
|
|
type Private_Data is limited private;
|
|
-- Any information that the GNULLI needs maintained on a per-task basis.
|
|
-- A component of this type is guaranteed to be included in the
|
|
-- Ada_Task_Control_Block.
|
|
|
|
private
|
|
|
|
type Lock is record
|
|
Mutex : aliased System.OS_Interface.CRITICAL_SECTION;
|
|
Priority : Integer;
|
|
Owner_Priority : Integer;
|
|
end record;
|
|
|
|
type Condition_Variable is new System.OS_Interface.HANDLE;
|
|
|
|
type RTS_Lock is new System.OS_Interface.CRITICAL_SECTION;
|
|
|
|
type Suspension_Object is record
|
|
State : Boolean;
|
|
pragma Atomic (State);
|
|
-- Boolean that indicates whether the object is open. This field is
|
|
-- marked Atomic to ensure that we can read its value without locking
|
|
-- the access to the Suspension_Object.
|
|
|
|
Waiting : Boolean;
|
|
-- Flag showing if there is a task already suspended on this object
|
|
|
|
L : aliased System.OS_Interface.CRITICAL_SECTION;
|
|
-- Protection for ensuring mutual exclusion on the Suspension_Object
|
|
|
|
CV : aliased System.OS_Interface.HANDLE;
|
|
-- Condition variable used to queue threads until condition is signaled
|
|
end record;
|
|
|
|
type Private_Data is record
|
|
Thread : aliased System.OS_Interface.HANDLE;
|
|
pragma Atomic (Thread);
|
|
-- Thread field may be updated by two different threads of control.
|
|
-- (See, Enter_Task and Create_Task in s-taprop.adb).
|
|
-- They put the same value (thr_self value). We do not want to
|
|
-- use lock on those operations and the only thing we have to
|
|
-- make sure is that they are updated in atomic fashion.
|
|
|
|
Thread_Id : aliased System.OS_Interface.DWORD;
|
|
-- Used to provide a better tasking support in gdb
|
|
|
|
CV : aliased Condition_Variable;
|
|
-- Condition Variable used to implement Sleep/Wakeup
|
|
|
|
L : aliased RTS_Lock;
|
|
-- Protection for all components is lock L
|
|
end record;
|
|
|
|
end System.Task_Primitives;
|