This week's book giveaways are in the iOS and Features new in Java 8 forums. We're giving away four copies each of Barcodes with iOS: Bringing together the digital and physical worlds and Core Java for the Impatient and have the authors on-line! See this thread and this one for details.
The JVM has a section of it devoted to keep threads from arguing with each other about who gets to run when. That is called the thread schedular. Think of it as a traffic cop telling each thread when it can run and for how long.
"JavaRanch, where the deer and the Certified play" - David O'Meara