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Date: Fri, 05 Aug 2011 10:47:41 +0100
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Subject: Re: [PHP-DEV] TameJS syntax for Async/Parallel execution in PHP
From: jezz.g@officechristmas.co.uk (Jezz Goodwin)

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Ah, I've just done a bit of reading in to the PHP MySQL native driver.

It is already possible to do async mysql calls. The documentation in 
mysqli::query (http://www.php.net/manual/en/mysqli.query.php) references 
MYSQL_ASYNC.

So, if you're just using Mysql, I think there is enough functionality in 
PHP today to make the kind of program you're after.


On 05/08/2011 09:20, Jezz Goodwin wrote:
> This looks similar to Twisted in Python 
> (http://twistedmatrix.com/trac/) and NodeJS (http://nodejs.org/) which 
> are both non-blocking event driven IO engines.
>
> The actual event driven side of things could be written today in PHP. 
> There's nothing stopping you from writing an event call stack that 
> manages call backs.
>
> The problem will occur when you try to do any IO in a asynchronous 
> manner. As far as I know all of the PHP IO operations happen in sync 
> (there is a pause in the script while waiting for the IO event to 
> return.)
>
> So, basically async versions of all the needed IO calls (MySQL, 
> MemCache, FileIO etc) would need to be created which can handle a 
> callback function. These could be done initially with PECL modules. 
> (no reason to touch the core to get these working).
>
> Apparently (according to Ryan Dahl of NodeJs) making async calls isn't 
> as easy as it could be. Especially in MySQL as the base MySQL 
> libraries in C are blocking (synchronous).
>
> If you're interested in non-blocking IO, I recommend watching the 
> videos on NodeJs.org
>
>
>
> On 05/08/2011 02:54, Raymond Irving wrote:
>> Hello,
>>
>> I came across this little library called TameJS (http://tamejs.org/) and
>> fell in love with the it's syntax. This had me thinking if it was 
>> possible
>> to add such features to a PHP CLI (or web app):
>>
>> <?php
>>
>> await { // wait until all calls within this block is
>>      mysql_query_async($sql, $args, defer($rs)); // call asynchronous 
>> query
>>      curl_post_async($url,$data, defer($response)); // make 
>> asynchronous http
>> request
>> }
>> $rows = $rs->fetchAll();
>> // do something here
>>
>> ?>
>>
>> The "await" keyword marks a section of code that depends on externals
>> events, like network or disk activity, or a timer. An await block 
>> contains
>> one or more calls to defer.
>>
>> I think the above syntax makes it easier to write asynchronous apps 
>> that can
>> take advantage of multiple threads or processors
>>
>>
>> What do you think?
>>
>>
>> __
>> Raymond
>>
>

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