// calculation thread function
void CalcPage::DoCalculation(void)
{
	bool mod;

	INTERLOCKED_(mutex)  {
		inThread = true;
	}
	do
	{
		INTERLOCKED_(mutex)  {
			modified = false;
		}

		// gets the status bar
		StatusBar &sb = ((Lamell *)(GetMainWindow()))->GetStatusBar();
		{
			// signals calculation in progress
			GuiLock __;
			sb.Set("Calcolo in corso");
		}
		calcAborted = !Calculate();
		{
			// signals end of calculation
			GuiLock __;
			if(calcAborted)
				sb.Set("Errore");
			else
				sb.Set("Pronto");
		}
		INTERLOCKED_(mutex) {
			mod = modified;
		}
	}
	while(mod);
	INTERLOCKED_(mutex) {
		inThread = false;
	}
}

// modify handler -- triggers page calculation
// on keypress on every (editable) ctrl on page
void CalcPage::ModifyCb(void)
{
	bool inTh;
	INTERLOCKED_(mutex) {
		inTh = inThread;
	}
	if(!inTh)
	{
		calcThread.Run(THISBACK(DoCalculation));
		return;
	}
	INTERLOCKED_(mutex) {
		modified = true;
	}
}