[Haskell-cafe] thread safety, IO arrays, and IO refs

Simon Marlow marlowsd at gmail.com
Wed Jan 5 16:23:51 CET 2011

On 31/12/2010 09:19, Eric Stansifer wrote:
> Hello,
> I wish to use a mutable array in multiple threads.  Can IO arrays be
> used in any thread, or only the thread they are created in?  (So if I
> create an IO array in one thread, pass it to another via an MVar, can
> I read / edit it in that other thread?)  Similarly about IORefs... can
> they be used across threads?

There are no restrictions, you can use an IOArray or IORef in any thread.


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