Yes when I write block I meant park.
My first idea was to use a control channel which have pause and resume 
input but then my question is 
<! control-channel would park until a value is available, what if I want to 
continue is there is nothing ?

On Thursday, September 11, 2014 4:39:51 PM UTC+2, Alex Miller wrote:
>
> You should never block a go loop other than by using a parking channel op 
> (like <!, >!, etc).
>
> You probably instead want a control channel where you can send it a pause 
> message telling it to block on the control channel until a resume message 
> arrives.
>
> On Thursday, September 11, 2014 6:52:48 AM UTC-5, Jeremy Vuillermet wrote:
>>
>> Hello,
>>
>> here is my use case 
>>
>> (defn replay [history] (go (doseq [millis history] 
>>                                           (<! (timeout millis)) 
>>                                           (prn millis))))
>>
>> history is a vector of duration: [1000 2000 4000]
>>
>> Now I would like to pause this doseq. One way is to use an atom pause?, 
>> check for the pause and block until a new value in a "resume" chan.
>>
>> But there may be an other way with channels only and avoid global/shared 
>> pause atom.
>> I was naively thinking of a pause channel and at each loop I check if 
>> there is a value but I'm not sure it's better and I couldn't manage to do 
>> it anyway.
>>
>

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