symfony: Commands not working with pthreads

Symfony version(s) affected: 4.1.4

Description
I want to use Threads in Symfony commands to parallelize processes. Basis for this is the pthreads extension.

Starting a Thread in within a symfony command results in a

Fatal error: Uncaught Exception: Serialization of 'Closure' is not allowed in [no active file]:0
Stack trace:
#0 {main}
  thrown in [no active file] on line 0

error. My Thread example does not use any closures.

How to reproduce
Find the code that reproduces the error at: https://github.com/nahpeps/pthreads-example It encapsulates everything in a docker container.

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 18 (7 by maintainers)

Most upvoted comments

I came across this issue today. Spend almost all day trying to debug it. And at this point, it doesn’t look like it is something PSR-4 related. I assume all of us are using Symfony\Component\Console\Command\Command in order to run some pthreads magic. As latest (v3) pthreads works only in PHP cli mode. So if i put following code at the top of execute of my command, it fixes the issue:

        if ($phpHandler = set_exception_handler(function() {})) {
            restore_exception_handler();
            if (is_array($phpHandler) && $phpHandler[0] instanceof \Symfony\Component\Debug\ErrorHandler) {
                $phpHandler[0]->setExceptionHandler(null);
            }
        }

I don’t really want to spend another few days to figure out what is an actual problem and how to fix it. As I think it should be something relatively simple to do for a person who is familiar with Symfony core code. @nicolas-grekas maybe you can help with it?

Meantime, @curry684 @erik404 @nahpeps @fholbrook can any of you confirm this solution works for you too?

SerheyDolgushev on Feb 28, 2019