Use the mutex LockableObject on Truffle.

chrisseaton · chrisseaton · commit b7bc7d08bc15 · 2016-01-19T21:08:43.000Z
diff --git a/lib/concurrent/synchronization/lockable_object.rb b/lib/concurrent/synchronization/lockable_object.rb
@@ -13,7 +13,7 @@ module Synchronization
                                    when Concurrent.on_rbx?
                                      RbxLockableObject
                                    when Concurrent.on_truffle?
-                                     TruffleLockableObject
+                                     MriMutexLockableObject
                                    else
                                      warn 'Possibly unsupported Ruby implementation'
                                      MriMonitorLockableObject
