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Should I use a lock on resources in a listener node with multiple callbacks?

asked 2012-11-15 11:39:04 -0600

robzz
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If I have a node which listens to multiple topics & has a callback for each topic, should I need locks/mutexes on the resources that are changed by more than one callback? My question stems from whether or not callback functions are executed in new threads--could code be concurrently executing in two different callback functions at once?

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answered 2012-11-15 21:31:10 -0600

Lorenz

22731 ●129 ●202 ●316 http://ias.in.tum.de/p...

The answer depends on the number of spin loops you are running. Have a look at this page.

The short answer is: if you call spin only once in your applications, you shouldn't need to synchronize. If you have multiple spinners, synchronize.