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Subject: Help please: child processes are not killed when PHP is done
From: oneil@saxonica.com (O'Neil Delpratt)

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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 =3D getmypid();
$child_threads =3D trim(`ls /proc/{$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 =3D new Saxon\SaxonProcessor();

// 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;
/>


Gives the output:

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

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.AP=
I/php7_saxon.cpp =
<https://dev.saxonica.com/repos/archive/opensource/latest9.8/hec/Saxon.C.A=
PI/php7_saxon.cpp>=

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