[M3devel] lock before or after try?

[Roland Illig]

Jay K schrieb:
> lock
> try
>   stuff
> finally
>   unlock
> end
> 
> or
> try
>   lock
>   stuff
> finally
>   unlock
> end
> 
> Lock can't fail so no difference?

I would always choose the first variant, because if locking fails for 
some reason (although it cannot, I know), unlock will not be called 
without a corresponding lock.

At least in Java, it may happen that another thread interrupts this one 
just in the very nanosecond between the try and lock, throwing an 
exception, and then you would unlock something that hasn't been locked 
before.

Roland