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Date: Tue, 07 Apr 2015 16:56:37 +0200
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To: Dmitry Stogov <dmitry@zend.com>
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Subject: Re: [PATCH] Tick functions (on C level) with state
From: php@hristov.com (Andrey Hristov)

  Hi Dmitry,
On  7.04.2015 16:33, Dmitry Stogov wrote:
> Hi Andrey,
>
> I didn't get why do you need this extension and how it's going to be used.

I would like to implement  (I have a PoC for this too), asynchronous 
query handlers in mysqli@mysqlnd. Currently it is possible to have some 
asynchronisity like

$c = mysqli_query("....", MYSQLI_ASYNC);

// do some work
// poll with mysqli_poll

// synchronise with mysqli_reap_async_query

// fetch data

I would like to skip the //poll and in some cases the //synchronise part 
and have

$c = mysqli_query("....", MYSQLI_ASYNC,
    function () use ($c) {
       $res = mysqli_reap_async_query($c);
       // do something with the result
    }
);

The closure can also set some global flag, and somewhere in the "main" 
thread it one can synchronize on it. It can also use [class, method] 
callback syntax. For example one can subclass class mysqli, add some 
status variables for state, and a method to pass to mysqli_query()/ 
mysqli::query().

mysqlnd registers a small tick function, that does select, and if there 
is data to be read the closure is called. Another closure for handling 
an error should be added too (but I don't have it my PoC).

Hope this helps to enlighten my intentions.

Best,
Andrey


> Thanks. Dmitry.
>
> On Tue, Apr 7, 2015 at 4:43 PM, Andrey Hristov <php@hristov.com
> <mailto:php@hristov.com>> wrote:
>
>       Hi,
>     I would like to hear comments about a small change to the low-level
>     tick functionality (main/php_ticks.c) to add state to when calling a
>     C tick function
>     The patch is alive at : http://pastebin.com/0zhVNxaY
>
>     Currently a C tick function gets as a parameter just the number of
>     ticks, and can't preserve state between calls. On PHP level one can
>     use closures to mitigate this, but in the C world we don't have this
>     luxury.
>
>     Any comments are very welcome. If possible to get in PHP7.
>
>
>     Cheers,
>     Andrey
>
>