is there a thread-safe version of `mutableMapOf()`...

# announcements

[LS]

is there a thread-safe version of mutableMapOf()?
i need the map to be thread-safe, and also hold its entries in the order of insertion.

[karelpeeters]

Collections.synchronizedMap(LinkedHashMap())

[karelpeeters]

Will get you some barebones thread safety.

[LS]

thank you!

[karelpeeters]

But keep in mind that you need to be very careful, eg doing things like

if (x in map) println(map[x])

is still thead-unsafe.

[LS]

I see. thanks

[bbaldino]

is it ever better to use Collections.synchronizedMap(LinkedHashMap()) over ConcurrentHashMap ?

[karelpeeters]

If you want insertion order to be kept, otherwise no, ConcurrentHashMap is way better. synchronizedMap just naively puts a single lock on everything, ConcurrentHashMap actually allows things like overlapping reads etc.

[bbaldino]

ah right, i guess synchronizedMap can be used on any map type (like Linked) which could be nice if you don't mind the naive synchronization