Check the status of the tasks.

def check_status(self):
        """Check the status of the tasks."""
        # Recompute the status of the tasks
        # Ignore OK and LOCKED tasks.
        for task in self:
            if task.status in (task.S_OK, task.S_LOCKED): continue
            task.check_status()

        # Take into account possible dependencies. Use a list instead of generators
        for task in self:
            if task.status == task.S_LOCKED: continue
            if task.status < task.S_SUB and all(status == task.S_OK for status in task.deps_status):
                task.set_status(task.S_READY, "Status set to Ready")