Re: functions inside of go blocks

2014-01-17 Thread Alex Miller
You can definitely call functions, just not ones use the channel ops. The 
recommendation is to keep the io ops inside the go block and pull your 
logic into external functions. 

There are two benefits to this approach: 
1) You keep all the impure io stuff together in the go block while putting 
your logic into pure functions.
2) Code in the go block has a performance penalty as it is being rewritten 
by the go macro - putting your logic into external functions avoids this 
penalty.

If you really want to abstract code with channel ops, then you should use a 
macro. 



On Saturday, January 11, 2014 1:45:08 PM UTC-6, t x wrote:

 Hi,

   Consider this function:

 (defn try-put! [chan msg]
 (not (= (alts! [chan msg]
 :default :chan-full)
 :chan-full)))


 Now, I understand that:
 * go blocks involve deep macro walking / rewriting
 * thus, I can't call this function inside of a go block

 My question:

 * without rewriting the above as a macro, is there a way to
 call functions inside a go block?




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Re: functions inside of go blocks

2014-01-16 Thread Bart Spiers
I'm not really familiar with async, but why would you not be allowed to 
call that function inside a go block?

On Saturday, January 11, 2014 8:45:08 PM UTC+1, t x wrote:

 Hi,

   Consider this function:

 (defn try-put! [chan msg]
 (not (= (alts! [chan msg]
 :default :chan-full)
 :chan-full)))


 Now, I understand that:
 * go blocks involve deep macro walking / rewriting
 * thus, I can't call this function inside of a go block

 My question:

 * without rewriting the above as a macro, is there a way to
 call functions inside a go block?




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Re: functions inside of go blocks

2014-01-16 Thread t x
Hi Bart,

  !, !, alts! must happen within a _lexical scope_ of a (async/go block)


On Thu, Jan 16, 2014 at 1:32 PM, Bart Spiers bart.ape...@gmail.com wrote:

 I'm not really familiar with async, but why would you not be allowed to
 call that function inside a go block?


 On Saturday, January 11, 2014 8:45:08 PM UTC+1, t x wrote:

 Hi,

   Consider this function:

 (defn try-put! [chan msg]
 (not (= (alts! [chan msg]
 :default :chan-full)
 :chan-full)))


 Now, I understand that:
 * go blocks involve deep macro walking / rewriting
 * thus, I can't call this function inside of a go block

 My question:

 * without rewriting the above as a macro, is there a way to
 call functions inside a go block?


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functions inside of go blocks

2014-01-11 Thread t x
Hi,

  Consider this function:

(defn try-put! [chan msg]
(not (= (alts! [chan msg]
:default :chan-full)
:chan-full)))


Now, I understand that:
* go blocks involve deep macro walking / rewriting
* thus, I can't call this function inside of a go block

My question:
* without rewriting the above as a macro, is there a way to
call functions inside a go block?

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