Re: [PHP-DEV] Help please: child processes are not killed when PHP is done

[O'Neil Delpratt]

From my investigation an internal library Excelsior Jet is creating the extra 
threads, which I need to release.


> On 17 May 2018, at 09:57, O'Neil Delpratt <on...@saxonica.com> wrote:
> 
> Hi All,
> 
> I am experiencing a strange behaviour in my PHP extension. My setup: Ubuntu 
> LTS 16, Apache 2.4, PHP 7.0.30 (tested with PHP 7.1.17) and latest Saxon-HE/C 
> 64bit.
> 
> Observed behaviour is that Apache spawns a couple of child processes as soon 
> as Saxon is invoked. Problem is that those child processes are not killed 
> when PHP is done.
> 
> Code
> <?php
> // output current PID and number of threads
> $pid = getmypid();
> $child_threads = trim(`ls /proc/{$pid}/task | wc -l`);
> 
> echo "&lt;pre&gt;";
> echo "Process ID :$pid".PHP_EOL;
> echo "Number of threads: $child_threads".PHP_EOL;
> echo str_repeat("-", 20).PHP_EOL;
> 
> $sax = new Saxon\SaxonProcessor();
> 
> // output number of threads again
> $child_threads = trim(`ls /proc/{$pid}/task | wc -l`).PHP_EOL;
> echo "Number of threads: $child_threads".PHP_EOL;
> />
> 
> 
> Gives the output:
> 
> Process ID: 5591 Number of threads: 1 ——————— Number of threads: 9
> 
> Running that code snippet, I see that additional 9 child threads are running, 
> but they stay alive until I manually kill them.
> 
> Source code of php extension: 
> https://dev.saxonica.com/repos/archive/opensource/latest9.8/hec/Saxon.C.API/php7_saxon.cpp
>  
> <https://dev.saxonica.com/repos/archive/opensource/latest9.8/hec/Saxon.C.API/php7_saxon.cpp>


--
PHP Internals - PHP Runtime Development Mailing List
To unsubscribe, visit: http://www.php.net/unsub.php