[Interest] QThreadPool - global instance or custom one

Frank Rueter | OHUfx frank at ohufx.com
Fri Jan 20 21:49:57 CET 2017

Thanks for confirming Bo, I will adjust my code accordingly.

On 20/01/17 10:36 PM, Bo Thorsen wrote:
> I have exactly the same rule for my coding as Thiago does. And my 
> answer would be the same for this. If one of the models have jobs that 
> could hurt the performance of the other jobs, give it a pool of it's 
> own. If not, you can share.
> Bo.
> 2017-01-20 4:44 GMT+01:00 Frank Rueter | OHUfx <frank at ohufx.com 
> <mailto:frank at ohufx.com>>:
>     Great, thanks for the quick reply and confirmation.
>     One more question: Would you create one QThreadPool instance for
>     the entire application or create new instances as you go (from
>     within different modules). Does it matter?
>     Cheers,
>     frank
>     On 20/01/17 3:29 PM, Thiago Macieira wrote:
>         On sexta-feira, 20 de janeiro de 2017 11:59:31 PST Frank
>         Rueter | OHUfx wrote:
>             Hi all,
>             I have started using QThreadPool for the first time and am
>             wondering if
>             it's save/recommended to create my own instance of it or
>             to always use
>             the global instance?
>         The rule I use is that you should use your own pool if you
>         plan on launching
>         tasks that may block, but it's ok to use the global one if you
>         need to run
>         things that run as fast as they can without blocking.
>         QHostInfo uses its own thread pool because it calls a blocking
>         function that
>         is known to sometimes take 30 seconds to return (getaddrinfo).
>             In my case my app will run inside a host application, so
>             my gut feeling
>             says to create my own thread pool so I don't accidentally
>             hijack the
>             host application's pool, but I may be wrong?!
>         You're probably right. QHostInfo's example also matches your
>         thinking: Qt's
>         behind-the-scenes usage should not affect the main
>         application's ability to
>         use the global thread pool.
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