Use LOCK macros for non-recursive locks

Instead of std::unique_lock.

src/httpserver.cpp

@@ -69,7 +69,7 @@ class WorkQueue
 {
 private:
     /** Mutex protects entire object */
-    std::mutex cs;
+    CWaitableCriticalSection cs;
     std::condition_variable cond;
     std::deque<std::unique_ptr<WorkItem>> queue;
     bool running;
@@ -88,7 +88,7 @@ public:
     /** Enqueue a work item */
     bool Enqueue(WorkItem* item)
     {
-        std::unique_lock<std::mutex> lock(cs);
+        LOCK(cs);
         if (queue.size() >= maxDepth) {
             return false;
         }
@@ -102,7 +102,7 @@ public:
         while (true) {
             std::unique_ptr<WorkItem> i;
             {
-                std::unique_lock<std::mutex> lock(cs);
+                WAIT_LOCK(cs, lock);
                 while (running && queue.empty())
                     cond.wait(lock);
                 if (!running)
@@ -116,7 +116,7 @@ public:
     /** Interrupt and exit loops */
     void Interrupt()
     {
-        std::unique_lock<std::mutex> lock(cs);
+        LOCK(cs);
         running = false;
         cond.notify_all();
     }