virThread: why no return values permitted in thread API?

[Daniel P. Berrangé]

On Wed, Apr 20, 2022 at 02:24:39PM +0200, Claudio Fontana wrote:
> Hi,
> 
> I noticed that in the virThread API return values from threads are explicitly excluded from the API.
> 
> The "virThreadHelper" sits in the middle between the caller of
> virThreadCreate and pthread, making it impossible to return a
> value from the thread, to check after joining the thread.

Mostly a historical artifact from when we had a native impl of
threads for Win32. We didn't need that ability, so I never
bothered to try to figure it out for Win32  and thus for
consistency I left it out of POSIX impl too.

With regards,
Daniel
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