@@ -61,11 +61,11 @@
 	id retval;
 #endif
 }
 
 /**
- * \param obj An object that is passed to the main method as a copy
+ * \param obj An object that is passed to the main method as a copy or nil
  * \return A new, autoreleased thread
  */
 + threadWithObject: (id)obj;
 
 /**
@@ -87,11 +87,11 @@
  * \param key The Thread Local Storage key
  */
 + (id)objectForTLSKey: (OFTLSKey*)key;
 
 /**
- * \param obj An object that is passed to the main method as a copy
+ * \param obj An object that is passed to the main method as a copy or nil
  * \return An initialized OFThread.
  */
 - initWithObject: (id)obj;
 
 /**
@@ -109,5 +109,33 @@
  *
  * \return The object returned by the main method of the thread.
  */
 - join;
 @end
+
+/**
+ * A class for creating mutual exclusions.
+ */
+@interface OFMutex: OFObject
+{
+#ifndef _WIN32
+	pthread_mutex_t mutex;
+#else
+	HANDLE mutex;
+#endif
+}
+
+/**
+ * \return A new, autoreleased mutex.
+ */
++ mutex;
+
+/**
+ * Locks the mutex.
+ */
+- lock;
+
+/**
+ * Unlocks the mutex.
+ */
+- unlock;
+@end