private static readonly object wordCountCalculatorSyncObj = new object();

private static void ThreadDoWork() {
	bool atLeastOneWordRemaining;
	int thisWordIndex;
	lock (wordCountCalculatorSyncObj) {
		thisWordIndex = currentWordIndex;
		currentWordIndex = currentWordIndex + 1;
	}
	if (thisWordIndex >= wordList.Count) atLeastOneWordRemaining = false;
	else atLeastOneWordRemaining = true;

	while (atLeastOneWordRemaining) {
		string thisWord = wordList[thisWordIndex];

		if (curseWords.Contains(thisWord)) Console.WriteLine("Curse word detected!");

		lock (wordCountCalculatorSyncObj) {
			bool firstOccurrenceOfWord = !wordCountDict.ContainsKey(thisWord);
		
			if (firstOccurrenceOfWord) wordCountDict.Add(thisWord, 1);
			else wordCountDict[thisWord] = wordCountDict[thisWord] + 1;
			thisWordIndex = currentWordIndex;
			currentWordIndex = currentWordIndex + 1;
		}
		if (thisWordIndex >= wordList.Count) atLeastOneWordRemaining = false;
	}
}