Add Rutime::inRuntime() and Runtime::executeAndWait()

emper/Dispatcher.hpp

@@ -56,5 +56,10 @@ public:
 		return currentFiber;
 	}
 
+	static bool isDispatchedControlFlow() {
+		const Fiber* fiber = getCurrentFiberPtr();
+		return fiber != nullptr;
+	}
+
 	friend ContextManager;
 };

emper/Runtime.cpp

@@ -135,3 +135,25 @@ void Runtime::printLastRuntimeStats() {
 	currentRuntime->printStats();
 }
 
+bool Runtime::inRuntime() {
+	return dispatcher.isDispatchedControlFlow();
+}
+
+void Runtime::executeAndWait(std::function<void()> f) {
+	if (inRuntime()) {
+		ABORT("Ca not use executeAndWait() from within the Runtime");
+	}
+
+	std::mutex fiberFinished;
+	fiberFinished.lock();
+
+	Fiber* fiber = Fiber::from([&] {
+			f();
+
+			fiberFinished.unlock();
+		});
+
+	schedule(*fiber);
+
+	fiberFinished.lock();
+}

emper/Runtime.hpp

@@ -113,6 +113,10 @@ public:
 
 	void printStats();
 
+	bool inRuntime();
+
+	void executeAndWait(std::function<void()> f);
+
 	friend ContextManager;
 	friend Scheduler;
 	friend Dispatcher;