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To: Derick Rethans <derick@php.net>, David Rodrigues <david.proweb@gmail.com>
CC: PHP Internals <internals@lists.php.net>
Thread-Topic: [PHP-DEV] Graceful timeout
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Date: Sat, 16 May 2020 18:55:58 +0000
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Subject: Re: [PHP-DEV] Graceful timeout
From: tysonandre775@hotmail.com (tyson andre)

Hi David,=0A=
=0A=
> You can probably implement this already with PHP's tick functionality =0A=
(https://www.php.net/manual/en/function.register-tick-function.php), as=0A=
> long as the code in the anonymous function does PHP statements/function =
=0A=
> calls.=0A=
>=0A=
> If your problem is waiting for an external resource to be available =0A=
> (database call, http call), then instead you should be able to use =0A=
> functionality of these services to handle your timeouts.=0A=
=0A=
If pcntl is available for your OS (not available on Windows), you can also =
use pcntl_async_signals() to allow receiving signals at any time, pcntl_ala=
rm() to send a signal at a given number of seconds from then, and throw a c=
ustom exception from pcntl_signal() for SIGALRM.=0A=
=0A=
ticks() is limited - Every file would need to declare ticks=3D1 as of php 7=
.0, or you might get delayed in the files that didn't.=0A=
=0A=
Supporting a cross-platform form of pcntl_alarm() might be a better abstrac=
tion,=0A=
but I don't have a strong use case for either of those.=0A=
When implementing it, you'd need to ensure it didn't interfere with php's i=
nternal time limit implementations or signal handlers in an undesirable way=
 (not something I'm deeply familiar with).=0A=
That would also need to enable the checks that pcntl_async_signals(true) do=
es. =0A=
=0A=
https://www.php.net/manual/en/function.pcntl-alarm.php=0A=
https://www.php.net/manual/en/function.pcntl-async-signals.php=0A=
https://www.php.net/manual/en/function.pcntl-signal.php=0A=
=0A=
- Tyson=