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Message: [QUOTE="Ladislav Andel, post: 3004077"] Hi, I'm writing an application which will be periodically testing servers. I will have a global list of these servers(domain names) and need to do few tasks. 1) DNS checks - I will use asynchronous twisted-names for it - in case there is a difference comparing to the list it should update the list(then also in DB) 2) ICMP pings - should be also possible to do it asynchronously 3) Blocking function which will be pinging with SIP requests - here I will use function deferToThread to make it non-blocking. Questions: 1) How do I lock each thread when writing to a global list in twisted? 2) How will I put together all three results mentioned above in the global list - is it by using function callLater ? 3) Could you help me with a rough skeleton of this application, please? Thank you, Lada [/QUOTE]