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re-entrancy question

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I have a program that instantiates some objects and runs a main loop.
Before the main loop starts, I create a thread that listens to TCP
connections on a port. If any connections are made, and depending on
the data, I call methods on some of those objects.

I am worried that calling methods on objects from outside the main loop,
but that are also operated on in the main loop, could cause problems.

My questions:
1) is this safe?
2) what kind of problems could occur?
3) how do I safely handle this?

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