[Qt-interest] efficient Wait for Thread finished?

[Arnold Krille]

On Tuesday 20 January 2009 17:43:27 Matthias Pospiech wrote:
> So if  I use
> void SaveDataThread::saveData()
> {
>    QMutexLocker locker(&mutex);
> ...
> }
> how do I test in all the other member functions that the saveData is
> still running? I could not find any such function in Mutex or MutexLocker.

Well, your saveData should lock the mutex only short before accessing the 
communication data-structure (and release the lock shortly afterwards).
And the other threads that want to access this data-structure lock the same 
mutex shortly before. And when the mutex is already locked by another thread, 
their lock()-function will block until the mutex is released. If you want the 
non-blocking behaviour you should look at tryLock() but then you have to check 
its return value whether you got the lock or not.
That is all described pretty well in the Qt docs, I got most of my multi-
thread knowledge from there (and from actually using it). :-)

Have fun,

Arnold
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