Map with concurrent access

Question

When you use a map in a program with concurrent access, is there any need to use a mutex in functions to read values?

Answer 1

I answered your question in this reddit thread few days ago:

In Go, maps are not thread-safe. Also, data requires locking even for reading if, for example, there could be another goroutine that is writing the same data (concurrently, that is).

Judging by your clarification in the comments, that there are going to be setter functions too, the answer to your question is yes, you will have to protect your reads with a mutex; you can use a RWMutex. For an example you can look at the source of the implementation of a table data structure (uses a map behind the scenes) which I wrote (actually the one linked in the reddit thread).