[Live-devel] [EXTERNAL] Re: Possible issue in DelayQueue

[Hansen Jan Rørgård]

Thank you very much for the quick response and the new version.

Best Regards

Jan Rørgaard Hansen
Lead Software Developer
Communication Solutions
Business Area Surveillance

Tel.:  + 45 3638 3000
Call me on: Skype
E-mail: jan.r.hansen at dk.saabgroup.com





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-----Original Message-----
From: live-devel <live-devel-bounces at us.live555.com> On Behalf Of Ross Finlayson
Sent: 11. januar 2023 20:20
To: LIVE555 Streaming Media - development & use <live-devel at us.live555.com>
Subject: [EXTERNAL] Re: [Live-devel] Possible issue in DelayQueue



> On Jan 11, 2023, at 8:59 AM, Hansen Jan Rørgård <jan.r.hansen at dk.saabgroup.com> wrote:
> 
> Hi,
>  In the liveMedia FAQ section: ”Is this code 'thread safe'? I.e., can it be accessed by more than one thread at the same time?”, it is stated that:
> “…Another possible way to access the code from multiple threads is to have each thread use its own "UsageEnvironment" and "TaskScheduler" objects, and thus its own event loop.”
>  I know that it is not recommended to use this approach

Yes, and you discovered a reason why: The code might inadvertently make use of shared (or static) variables that can cause problems with multiple threads :-)


> Do you also see an issue here?

Yes.  I have just installed a new version (2023-01-11) of the code that moves the ’token counter’ to be a field of the ’task scheduler’ object, so that it will no longer be shared by multiple threads.  This should avoid this problem.

Thanks for the report.


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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