Vector experiments, fixed atomic flag mistake, begin block-sync algorithm

experiments/mutex_multithread.cpp

@@ -57,7 +57,7 @@ int main() {
 	});
 	piCout << "stdMutex:" << stdMutexPerformance << "ms";
 
-	std::atomic_flag stdAtomic;
+	std::atomic_flag stdAtomic = ATOMIC_FLAG_INIT;
 	auto stdAtomicPerformance = check_performance([&stdAtomic](long& k){
 		while(stdAtomic.test_and_set(std::memory_order_acquire)) {
 			std::this_thread::yield();