Synchronizing access to shared resources

When you have multiple threads executing at the same time, there is a possibility that two or more threads may access the same variable or other resource at the same time and cause a problem.

For this reason, you should carefully consider how to make your code "thread safe".

The simplest mechanism for implementing thread safety is to use an object variable as a "flag" or "traffic light" to indicate when a shared resource has an exclusive lock applied.

Note

In William Golding's Lord of the Flies, Piggy and Ralph spot a conch shell and use it to call a meeting. The boys impose a "rule of the conch" on themselves, deciding that no one can speak unless he's holding the conch. I like to name the object variable ...

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