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: 2023/11/01 07:31 by skipidar