QWaitCondition vs WaitForSingleObject

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Hello,

does anybody knows how to use QWaitCondition object in the same manner of WaitForSignleObject?
I explain better:

I often used WaitForSingleObject to catch rised events without waiting
using the formula

if(WaitForSingleObject(hEvent,0)==WAIT_OBJECT_0){
//some code here
}

I'm trying to do the same thing with QWaitCondition but the following

mutex.lock();
waitevent.wait(&mutex,0);
mutex.unlock();

doesn't work. someone can help me?

thanks and I apologise for my bad english

Posted 15-Apr-14 5:09am

Optimistic76

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-04-15T05:32:00

One of the reasons to use Qt is the cross-platform development. Good Qt projects can be rebuild on a different platform; and the resulting application should work on a different OS.

This WaitForSingleObject is Windows-specific: http://msdn.microsoft.com/en-us/library/windows/desktop/ms687032%28v=vs.85%29.aspx[^].

If you use it in your code, it will kill your platform compatibility.

And QWaitCondition is the part of Qt, designed to abstract out the platform: http://qt-project.org/doc/qt-4.8/qwaitcondition.html[^].

Now, I'm not sure you understand thread synchronization. You are trying to wait inside a lock. The wait is itself a synchronization method to be used with multiple threads. The combinations like waiting inside a lock is the sure way to create some deadlocks. All thread synchronization should be theoretically proven.

—SA