Increase threadsafety annotation coverage

src/httpserver.cpp

@@ -87,7 +87,7 @@ public:
     {
     }
     /** Enqueue a work item */
-    bool Enqueue(WorkItem* item)
+    bool Enqueue(WorkItem* item) EXCLUSIVE_LOCKS_REQUIRED(!cs)
     {
         LOCK(cs);
         if (!running || queue.size() >= maxDepth) {
@@ -98,7 +98,7 @@ public:
         return true;
     }
     /** Thread function */
-    void Run()
+    void Run() EXCLUSIVE_LOCKS_REQUIRED(!cs)
     {
         while (true) {
             std::unique_ptr<WorkItem> i;
@@ -115,7 +115,7 @@ public:
         }
     }
     /** Interrupt and exit loops */
-    void Interrupt()
+    void Interrupt() EXCLUSIVE_LOCKS_REQUIRED(!cs)
     {
         LOCK(cs);
         running = false;