ext/oxt/detail/spin_lock_darwin.hpp in passenger-3.0.21 vs ext/oxt/detail/spin_lock_darwin.hpp in passenger-3.9.1.beta

@@ -62,8 +62,12 @@
 	}
 	
 	void unlock() {
 		OSSpinLockUnlock(&spin);
 	}
+
+	bool try_lock() {
+		return OSSpinLockTry(&spin);
+	}
 };
 
 } // namespace oxt