Re: [Dbus-cxx-users] 100% cpu usage on watcher thread under Linux

[Rick L. V. Jr. <rvi...@cs...>]

Hello Patrick,

Thanks for looking into this one. It's fixed in 0.3.1.


Patrick Allison wrote:
> Hi:
>
> watch_thread_main reuses its struct timeval timeout after passing a
> pointer to it to select(). Under Linux, the timeout is modified to reflect
> the amount of time remaining before timeout (i.e. zero after a timeout).
> POSIX allows either behavior (modifying or not modifying), and recommends
> that timeout be considered undefined after the select() call.
>
> Since the timeout's reduced to zero after the first call, the dispatcher's
> watch thread consumes 100% of the CPU.
>
> A simple fix is just
> struct timeval timeout = m_responsiveness;
> .. select(... , &timeout);
>
> instead of just passing &m_responsiveness.
>
> Patrick
>