programming:java:multithreading
Table of Contents
Multithreading
| What | Where |
|---|---|
| Introduction | vogella |
| Whereever possible use the safe Structures from | concurrent package |
PitFalls
- Do not use TimeStamps to synchronize Threads. Therere can be more than 1 action every millisecond - what to do with equal TimeStamps?
Concurrent Package
Das Concurrent Package bietet viele fertige Multithreading Klassen.
ForkJoin
A framework to execute parallel task. The mechanism is described here.
//A nice way to stop the UI thread, in order to wait for a job, without blocking the UI Jobs coming from other Threads
while(job.getResult()==null) {
Display.getDefault().readAndDispatch();
}
Try-Catch is Bypassed in nested threads
On every thread there should be an own Exception-handling. Putting a new Thread creation into try-catch block won't catch the Exceptions.
//ATTENTION: the exception is not catched!
try{
Runnable r = new Runnable() {
@Override
public void run() {
System.out.println("Thread");
Display.getDefault().syncExec(new Runnable() {
@Override
public void run() {
System.out.println("ThreadGUI");
throw new NullPointerException();
}
});
}
};
Thread t = new Thread(r);
t.start();
}catch(NullPointerException e){
//nothing
}
System.out.println("Ende");
programming/java/multithreading.txt · Last modified: by skipidar
