Simplify mutex locking scheme (lock at start, unlock at end)

src/state.hpp

@@ -22,8 +22,7 @@ namespace cw::state
     std::queue<u64> queue;
 
     bool pause_work, stop_work;
-    std::mutex mutex_queue;
-    std::mutex mutex_allocator;
+    std::mutex mutex;
 
     State(void) {};
   };