Forgot loop sequentialization

thread/threadpool.cpp

@@ -55,6 +55,7 @@ void ThreadPool::StartWorkers() {
 }
 
 void ThreadPool::ParallelLoop(std::function<void(int,int)> loop, int lower, int upper) {
+	mutex.lock();
 	StartWorkers();
 	int range = upper-lower;
 	if(range >= numThreads*2) { // don't parallelize tiny loops
@@ -70,5 +71,6 @@ void ThreadPool::ParallelLoop(std::function<void(int,int)> loop, int lower, int
 	} else {
 		loop(lower, upper);
 	}
+	mutex.unlock();
 }
 

thread/threadpool.h

@@ -34,8 +34,8 @@ private:
 };
 
 // A thread pool manages a set of worker threads, and allows the execution of parallel loops on them
-// individual parallel loops are sequentialized, which should not be a problem as they should each
-// use the entire system
+// individual parallel loops are fully sequentialized to simplify synchronization, which should not 
+// be a problem as they should each use the entire system
 class ThreadPool {
 public:
 	ThreadPool(int numThreads);