Added an isLocked() method to ReadWriteLock that checks whether ReadWriteLock is currently locked

modules/juce_core/threads/juce_ReadWriteLock.cpp

@@ -148,3 +148,9 @@ void ReadWriteLock::exitWrite() const noexcept
         waitEvent.signal();
     }
 }
+
+//==============================================================================
+bool ReadWriteLock::isLocked() const noexcept
+{
+    return numWriters != 0;
+}

modules/juce_core/threads/juce_ReadWriteLock.h

@@ -127,6 +127,12 @@ public:
     */
     void exitWrite() const noexcept;
 
+    //==============================================================================
+    /** Checks whether this object is locked.
+
+        @returns true if the object is currently locked.
+     */
+    bool isLocked() const noexcept;
 
 private:
     //==============================================================================