19235: Fixes slowdown with garbage collection when multithreading is …

…used (#71)

src/Amalgam/evaluablenode/EvaluableNodeManagement.cpp

@@ -181,16 +181,13 @@ void EvaluableNodeManager::CollectGarbage()
 	//keep trying to acquire write lock to see if this thread wins the race to collect garbage
 	Concurrency::WriteLock write_lock(memoryModificationMutex, std::defer_lock);
 
-	Concurrency::threadPool.ChangeCurrentThreadStateFromActiveToWaiting();	
 	do
 	{
 		if(!RecommendGarbageCollection())
 		{
 			if(memory_modification_lock != nullptr)
 				memory_modification_lock->lock();
 
-			Concurrency::threadPool.ChangeCurrentThreadStateFromWaitingToActive();
-
 			if(PerformanceProfiler::IsProfilingEnabled())
 				PerformanceProfiler::EndOperation(GetNumberOfUsedNodes());
 
@@ -206,15 +203,11 @@ void EvaluableNodeManager::CollectGarbage()
 		if(memory_modification_lock != nullptr)
 			memory_modification_lock->lock();
 
-		Concurrency::threadPool.ChangeCurrentThreadStateFromWaitingToActive();
-
 		if(PerformanceProfiler::IsProfilingEnabled())
 			PerformanceProfiler::EndOperation(GetNumberOfUsedNodes());
 
 		return;
 	}
-
-	Concurrency::threadPool.ChangeCurrentThreadStateFromWaitingToActive();
 #endif
 
 	//perform garbage collection