QWaitCondition and slot problem

Hi,
I've a slot:

Code:

---

void G2_ImageViewer::readImage()
{
	this->mutex.lock();
	if(this->getRingBuffer()->isReadLocked())
	{
		this->readLocked.wait(&this->mutex);
	}
	this->mutex.unlock();
 
	this->getRingBuffer()->pop();
}

---

When the ringbuffer is read locked (this->getRingBuffer()->isReadLocked() == true), it waits that someone unlock it. The problem is that this slot is connected to the signal clicked() of a QPushButton and if the slot is locked and it receives another signal, the program crashes.

How can I do to avoid the problem?

Thank you! Dario

(sorry for my english)