QMutex seems not to lock()

[sylvaticus]

I managed to retrieve the error also doing a more simple loop:

int main(int argc, char *argv[]){
 
	cout << "Test on a glpk application using Qt Threads" << endl<<endl;
	Thread wThread;
	for (uint y=0;y<5000;y++){
		wThread.start(); // job done from the other thread 
		wThread.wait();
	}
	cout <<"All done without errors (crashing)"<<endl;
	return 0;
}

int main(int argc, char *argv[]){

	cout << "Test on a glpk application using Qt Threads" << endl<<endl;
	Thread wThread;
	for (uint y=0;y<5000;y++){
		wThread.start(); // job done from the other thread 
		wThread.wait();
	}
	cout <<"All done without errors (crashing)"<<endl;
	return 0;
}

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The error I have from glpk is:

Assertion failed: xlcmp(env->t_last, t) <= 0
Error detected in file glplib10.c at line 109

I really do not understand why this external library crash if I put it on an external thread that I run consecutivly while it works whitout problems if I run it in the main thread.