OS Concepts in Layman Terms

What is the difference betwe开发者_JAVA百科en the following concepts in layman terms: spinning lock, blocking and condition?

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Spinning lock:

To quote Lisa and Bart: "Are we there yet? Are we there yet? Are we there yet?" - cute in small quantities, extremely annoying in large doses.

Blocking:

The gate at the starting line of a horse track, or the locked door at a store before a product launch work as examples of blocking operations. You can't get your new iPad until some guy in a black t-shirt opens the door.

Condition:

Don't do anything (or keep doing what you're doing) until you hear otherwise from me.