@Override
	public IStatus run(IProgressMonitor monitor) {
		//synchronized in case build starts during checkCancel
		synchronized (this) {
			if (monitor.isCanceled()) {
				return canceled();
			}
		}
		//if the system is shutting down, don't build
		if (systemBundle.getState() == Bundle.STOPPING)
			return Status.OK_STATUS;
		try {
			doBuild(monitor);
			lastBuild = System.currentTimeMillis();
			//if the build was successful then it should not be recorded as interrupted
			setInterrupted(false);
			return Status.OK_STATUS;
		} catch (OperationCanceledException e) {
			return canceled();
		} catch (CoreException sig) {
			return sig.getStatus();
		}
	}

if (systemBundle.getState() == Bundle.STOPPING) // Sometimes FALSE here even when application is shutting down!

			// Ignore if the application is closing
			if (Workbench.getInstance().isClosing()) {
				return;
			}