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Date: Thu, 17 May 2018 15:04:09 +0100
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To: PHP internals <internals@lists.php.net>
Subject: Re: [PHP-DEV] Help please: child processes are not killed when PHP is done
From: oneil@saxonica.com (O'Neil Delpratt)

=46rom 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 <oneil@saxonica.com> wrote:
>=20
> Hi All,
>=20
> 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.
>=20
> 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.
>=20
> Code
> <?php
> // output current PID and number of threads
> $pid =3D getmypid();
> $child_threads =3D trim(`ls /proc/{$pid}/task | wc -l`);
>=20
> echo "&lt;pre&gt;";
> echo "Process ID :$pid".PHP_EOL;
> echo "Number of threads: $child_threads".PHP_EOL;
> echo str_repeat("-", 20).PHP_EOL;
>=20
> $sax =3D new Saxon\SaxonProcessor();
>=20
> // output number of threads again
> $child_threads =3D trim(`ls /proc/{$pid}/task | wc -l`).PHP_EOL;
> echo "Number of threads: $child_threads".PHP_EOL;
> />
>=20
>=20
> Gives the output:
>=20
> Process ID: 5591 Number of threads: 1 =E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94 Number of threads: 9
>=20
> Running that code snippet, I see that additional 9 child threads are =
running, but they stay alive until I manually kill them.
>=20
> Source code of php extension: =
https://dev.saxonica.com/repos/archive/opensource/latest9.8/hec/Saxon.C.AP=
I/php7_saxon.cpp =
<https://dev.saxonica.com/repos/archive/opensource/latest9.8/hec/Saxon.C.A=
PI/php7_saxon.cpp>