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Date: Mon, 27 Jun 2016 14:28:31 +0300
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Subject: Re: [PHP-DEV] [RFC] Asynchronous Signal Handling (withiut TICKs and
 any additional overhead).
From: dmitry@zend.com (Dmitry Stogov)



On 06/27/2016 02:05 PM, Pierre Joye wrote:
> On Mon, Jun 27, 2016 at 5:08 PM, Joe Watkins <pthreads@pthreads.org> wrote:
>> Morning,
>>
>>      How is the impact wider than ext/pcntl ?
> The implementation is only in pctnl. The feature is used indirectly by
> the engine and makes it a core feature. Quote from the RFC:
>
> "Zend Engine in PHP 7.1 was extended with ability of safe time-out and
> interrupt handling. Actually, PHP VM checks for EG(vm_interrupt) flag
> on each loop iteration, user function entry or internal function exit,
> and call callback function if necessary.
>
> I propose to use this ability to implement asynchronous signal
> handling. Registered signal handlers are going to be called at some
> points during user script execution without any overhead."
>
> and the test:
>
> <?php
> ini_set("pcntl.async_signals", "1");
> pcntl_signal(SIGTERM, function ($signo) { echo "Signal handler called!\n"; });
>
> echo "Start!\n";
> posix_kill(posix_getpid(), SIGTERM);
> $i = 0; // dummy
> echo "Done!\n";
>
> It affects how signals are handled within the engine, obvioulsy.
>
> I have no doubt that this RFC will be accepted, by large, so it is not
> a big issue. However it does affect the engine so the 2/3 rule
> applies.
We use 2/3 vote for "a feature affecting the language itself (new syntax 
for example)", not the engine internals.

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