Merge branch 'tryLocker' into avatar

libraries/shared/src/TryLocker.h

@@ -0,0 +1,31 @@
+//
+//  TryLocker.h
+//  libraries/shared/src
+//
+//  Created by Brad Davis on 2015/03/16.
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_TryLocker_h
+#define hifi_TryLocker_h
+
+#include <QMutex>
+
+class MutexTryLocker {
+  QMutex & _mutex;
+  bool _locked{false};
+public:
+  MutexTryLocker(QMutex &m) : _mutex(m) {}
+  ~MutexTryLocker() { if (_locked) _mutex.unlock(); }
+  bool tryLock() {
+    if (_locked) {
+      return true;
+    }
+    return (_locked = _mutex.tryLock());
+  }
+}
+
+#endif // hifi_UUID_h