[Interest] Terminating a QThread

[Etienne Sandré-Chardonnal]

Except in this particular case where:
 - The flag is set to false at the start of the thread
 - Set to true for stopping by the controlling(parent) thread (writen,
never read)
 - Checked by the thread as a quit condition (read, never written)

In that case, there is absolutely no possible race condition & undefined
state. No thread makes composite access (fetch and set, fetch & add, etc...)

OK, that's not worth the discussion since the cost of atomic is negligible
and it's definitely a better habit to use atomics everywhere for values
accessed between threads.

Etienne


2013/6/22 Thiago Macieira <thiago.macieira at intel.com>

> On sábado, 22 de junho de 2013 12.41.10, Tony Rietwyk wrote:
> > But a bool value can be cached indefinitely, so make sure you declare the
> > flag as volatile!
>
> That's wrong and has been explained away several times. You need to
> declare it
> as atomic, not as volatile.
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
>
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