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Date: Wed, 7 Dec 2016 11:35:58 +0100
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Subject: RE: [PHP-DEV] Use pthread in php extension
From: anatol.php@belski.net ("Anatol Belski")

Hi Simon,

> -----Original Message-----
> From: simon .barotte [mailto:simon.barotte@gmail.com]
> Sent: Tuesday, December 6, 2016 10:49 AM
> To: internals@lists.php.net
> Subject: [PHP-DEV] Use pthread in php extension
>=20
> Hi all,
>=20
> I developpe an extension php, and I would like use Linux pthread in my =
extension
> (PHP 5.6.27).
> But I have a feeling that my thread don't work, I looked for the =
documentation
> but I find no concrete example.
> Can I use pthread without zts activated ? Sample of my code :
>=20
> void *called_from_thread(void *num){
>     php_printf(" print by thread");
> }
>=20
> PHP_FUNCTION(test){
>     pthread_t inc_x_thread;
>     int x =3D 0;
>=20
>     if(pthread_create(&inc_x_thread, NULL, called_from_thread, &x)) {
>         php_printf("Error creating thread");
>         return;
>     }
>=20
>     php_printf("This is main print");
>=20
>     if(pthread_join(inc_x_thread, NULL)) {
>         php_printf("Error joining thread");
>         return;
>     }
> }
>=20
> When I execute my extension in php, I always obtain the same display, =
This is
> main print print by thread For me the normal behavior of thread would =
be to
> have different displays sometimes... no ?
>=20
Of course you can link your extension with any possible library. =
Particularly with pthreads, when PHP is compiled non thread safe, you =
need to be very careful using the PHP APIs. Many will be not thread safe =
in that case. Best strategy were probably not using PHP APIs in the =
thread callbacks at all.

Probably a scenario were thinkable, to process some huge amount of data =
internally with multiple threads. But you can of course prepare some =
data, start threads in some internal PHP function, but don't return from =
that function until all the jobs are done.=20

Regards

Anatol