Let’s start with a new post in the Java concurrency series.
This time we’ll learn how to start cleanly new threads and to manage thread pools. In Java, if you have a Runnable like this :

Runnable runnable = new Runnable(){
public void run(){
System.out.println("Run");
}
}

You can easily run it in a new thread :
new Thread(runnable).start();
This is …

When a data (typically a variable) can be accessed by several threads, you must synchronize the access to the data to ensure visibility and correctness.
By example, if you have a simple counter (yes, once again) :

public class Counter {
private int value;
 
public int getValue(){
return value;
…

After seeing how to synchronize code using semaphores, we’ll see how to do that using monitors.
Monitors are an other mechanism of concurrent programming. It’s a higher level mechanism than semaphores and also more powerful. A monitor is an instance of a class that can be used safely by several threads. All the methods of a monitor are executed with mutual exclusion. So at most …