[erlang-questions] Port Driver. erl_drv_thread_join and ErlDrvTid reuse.

Zhemzhitsky Sergey <>
Thu Oct 11 16:17:25 CEST 2012


Thanks a lot. Now it's clear enough.

Best Regards,
Sergey

-----Original Message-----
From: Rickard Green [mailto:] 
Sent: Thursday, October 11, 2012 6:13 PM
To: Zhemzhitsky Sergey
Cc: Erlang Questions
Subject: Re: [erlang-questions] Port Driver. erl_drv_thread_join and ErlDrvTid reuse.



On 10/11/2012 03:11 PM, Zhemzhitsky Sergey wrote:
> Hi Rickard,
>
>>> Are you calling driver_failure_atom() from your thread? That would explain this issue.
>
> Exactly. Could you explain a little bit more why it can cause this issue (I suppose it's due to it is not thread safe)?
>

Yes, it is because driver_failure_atom() is not thread safe. Apart from misc thread unsafe modifications of the port internal state,
driver_failure_atom() can call the stop() callback which means that your thread will end up trying to join with itself.

Regards,
Rickard
--
Rickard Green, Erlang/OTP, Ericsson AB.

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