Method sendError

flow/include/flow/IThreadPool.h:103–109

		                                                    : TaskPriority::DefaultOnMainThread);
	}
	void sendError(Error e) { // Can be called safely from another thread.  Call send or sendError at most once.
		Promise<Void> signal;
		tagAndForwardError(&promise, e, signal.getFuture());
		g_network->onMainThread(std::move(signal),
		                        g_network->isOnMainThread() ? incrementPriorityIfEven(g_network->getCurrentTask())
		                                                    : TaskPriority::DefaultOnMainThread);
	}
	bool isValid() { return promise.isValid(); }

private: