Singleton pattern is a well-known pattern in programming. Double-checked locking is an implementation of singleton pattern which is intended to be thread-safe. However it is found that this method is broken, unless memory barrier is used which may has problem of portability.

In this article, I am going to present an alternative to double-checked locking ...

An excellent article about android. You shouldn't use android task killers, as they will cause system instability and more battery drain. Android version 2 or above doesn't need them.

You should use something like watchdog to see what apps is eating up resources and misbehave and end them instead.