how to read output after redirect_stdout()

[Yu Gong]

write some code need redirect_stdout, 

rd,wr=redirect_stdout()

print("xx")

println("\n")

readavailable(rd) ---->ok

readavailable(rd)---->blocked here

the question is sometimes I don't know whether there are output in buffer or not, so readavailable will block .

how to avoid blocked when read from pipe when don't know output is null or not ?

 

[Miguel Bazdresch]

You can wrap the `readavailable()` call on a task:

    @async while true

        if !isopen(rd)

            break

        end

        data = readavailable(rd)

    end

`data` is a global variable that can be read and written by both the task and the main process.

-- mb

[Yu Gong]

thanks a lot 

[Stefan Karpinski]

In the future, this sort of question is better suited for julia-users.