Re: Limiting to one instance

http://support.microsoft.com/default.aspx?scid=kb;en-us;106385

I guess it is an officially recommended technique.
A mutex is a proper kernel object, so should be pretty safe.

--  
()()      Richard Mitton
( '.')
(")_(")       code jester .:. treyarch .:. [email protected]




On 16 Aug 2006, at 12:37 am, Alen Ladavac wrote:

> Jon wrote:
>> Using FindWindow() introduces a possible race condition
>
> I stand corrected. I was using this for installers, not for actually
> preventing double-startup of the same app. So scratch my remark on
> FindWindow being useful here.
>
> Stefan wrote:
>> But CreateMutex etc *is* intended for the purpose.
>
> Well, I was replying to Andrew's comment on IP ports not being
> suitable for that purpose. In that context, I believe CreateMutex is
> not any more suitable. CreateMutex (named) is intended for the purpose
> of synchronizing two processes by actually using a mutex. Using the
> mutex's mere existance to note anything is as much of a hack as using
> an IP port for that. The fact that there are personal firewalls in the
> modern world is another hack as well. IP port creation was not
> supposed to be intercepted in this way - in the original design,
> AFAIK.
>
> Simply trying to point out the fact that we frequently have to use
> something for what it is not supposed to be used for. And often one
> can't predict all possible side-effects. Like that poor guy didn't
> predict that a firewall would make the IP-port solution useless, like
> FindWindow is not perfect due to a possible race condition, like the
> CreateMutex might have possible user-switching problem (although not
> likely, as local creation is default, IIRC).
>
> Put simply: unless the manual says "this can be used to do XYZ", then
> if you are using it for that, you are risking possible problems.
> (Although, you are probably risking possible problems even if it does
> say so. :p )
>
> JM2C,
> Alen
>
>
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