async read from device?

[Simon Byrne]

I'm trying to read from an input device asynchronously. I tried the obvious

@async begin

    dev = open(STICK_INPUT_DEV)

    while true

        s = read(dev, Stick)

        if s.ev_type == EV_KEY

            println(s)

        end

    end

end

But this doesn't seem to yield correctly. The full code is available here:

https://gist.github.com/simonbyrne/70f8c944ed7a76c95b1c90a964e9d7d1

I did come across this related discussion for file IO which didn't really resolve the issue:

https://groups.google.com/d/topic/julia-users/kfu_hgM3bnI/discussion

What's the best way to do this?

Simon

[Simon Byrne]

I found that this seemed to work:

const STICK_INPUT_DEV="/dev/input/event0"

@async begin

    stream, pipe = open(`cat $STICK_INPUT_DEV`)

    while true

        s = read(stream, Stick)

        if s.ev_type == EV_KEY

            println(s)

        end

    end

end

but it would be nice if there was a way to do this without cat

On Tuesday, 1 November 2016 11:17:31 UTC, Simon Byrne wrote:

I'm trying to read from an input device asynchronously. I tried the obvious

@async begin

    dev = open(STICK_INPUT_DEV)

    while true

        s = read(dev, Stick)

        if s.ev_type == EV_KEY

            println(s)

        end

    end

end

But this doesn't seem to yield correctly. The full code is available here:

<a href="https://gist.github.com/simonbyrne/70f8c944ed7a76c95b1c90a964e9d7d1" target="_blank" rel="nofollow" onmousedown="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgist.github.com%2Fsimonbyrne%2F70f8c944ed7a76c95b1c90a964e9d7d1\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNG3D1XOYUh9EOuZSG-QaxvDh6nnsw&#39;;return true;" onclick="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgist.github.com%2Fsimonbyrne%2F70f8c944ed7a76c95b1c90a964e9d7d1\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNG3D1XOYUh9EOuZSG-QaxvDh6nnsw&#39;;return true;">https://gist.github.com/simonbyrne/70f8c944ed7a76c95b1c90a964e9d7d1

I did come across this related discussion for file IO which didn't really resolve the issue:

<a href="https://groups.google.com/d/topic/julia-users/kfu_hgM3bnI/discussion" target="_blank" rel="nofollow" onmousedown="this.href=&#39;https://groups.google.com/d/topic/julia-users/kfu_hgM3bnI/discussion&#39;;return true;" onclick="this.href=&#39;https://groups.google.com/d/topic/julia-users/kfu_hgM3bnI/discussion&#39;;return true;">https://groups.google.com/d/topic/julia-users/kfu_hgM3bnI/discussion

What's the best way to do this?

Simon