/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: ThreadID.java
*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*
* Electric(tm) is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) is distributed in the hope that it will be useful,
* but WITHOUT 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
* along with Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.tool.util.concurrent.runtime;
/**
* This class provides unique thread IDs for each thread. A thread gets a thread
* ID assigned when get or set is called within the thread.
*
* @author Felix Schmidt
*
*/
public class ThreadID {
private static volatile int nextID = 0;
private static class ThreadLocalID extends ThreadLocal<Integer> {
/*
* (non-Javadoc)
*
* @see java.lang.ThreadLocal#initialValue()
*/
@Override
protected synchronized Integer initialValue() {
return nextID++;
}
}
private static ThreadLocalID threadID = new ThreadLocalID();
/**
* Get the thread ID of the current thread. The thead-id matching is done by
* a thread local variable.
*
* @return
*/
public static int get() {
return threadID.get();
}
/**
* Set the thread ID to a given value
*
* @param index
*/
public static void set(int index) {
threadID.set(index);
}
/**
* reset the all thread IDs. Call this before you start a new thread pool to
* make sure, that the thread IDs starts at 0
*/
public static void reset() {
ThreadID.threadID = new ThreadLocalID();
nextID = 0;
}
}