How to use one stream by two or more threads?

Hey guys,
i have got a little problem and do not know how to solve it. i hope you guys can are able to help me.
i have opened a bluetooth socket connection. now i want to use these streams by three or more threads. one thread should only read from an input stream. the other threads are supposed to write on the ouput stream.
(I think) I am only able to open one stream in each direction.
How do I realize the use of the output stream by two indepent threads?
thanks for your help!

thank you for the hint!
i will search it or do you know a good tutorial?

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