Hi,

If i am using static variable in a function, in say a dll. If that dll
is being used by a multi-threaded program, will the static variable be
safe to use? I mean, will it have the problems associated with using
global variables in this case, i.e. same variable being modified by
multiple threads, and hence creating issues...?

Thanks,
Kumar

"Kumar" <kumar_gaurava@yahoo.co.uk> wrote in message
news:80965d4.0401100252.36997e2b@posting.google.co m...[color=blue]
> If i am using static variable in a function, in say a dll. If that dll
> is being used by a multi-threaded program, will the static variable be
> safe to use? I mean, will it have the problems associated with using
> global variables in this case, i.e. same variable being modified by
> multiple threads, and hence creating issues...?[/color]

Yes.

(The fact that threads, DLLs and similar stuff is off-topical on this
group is irrelevant ;-))

Peter

I wrote:[color=blue]
> "Kumar" <kumar_gaurava@yahoo.co.uk> wrote:[color=green]
> > If i am using static variable in a function, in say a dll. If that dll
> > is being used by a multi-threaded program, will the static variable be
> > safe to use? I mean, will it have the problems associated with using
> > global variables in this case, i.e. same variable being modified by
> > multiple threads, and hence creating issues...?[/color]
>
> Yes.[/color]

On the second thought, I may not have been as clear as I could have been.

The answer is "no" to your first question and "yes" to the other(s).

Peter

Peter Pichler wrote:[color=blue]
>
> "Kumar" <kumar_gaurava@yahoo.co.uk> wrote in message
> news:80965d4.0401100252.36997e2b@posting.google.co m...[color=green]
> > If i am using static variable in a function, in say a dll.
> > If that dll
> > is being used by a multi-threaded program,
> > will the static variable be
> > safe to use? I mean, will it have the problems associated with using
> > global variables in this case, i.e. same variable being modified by
> > multiple threads, and hence creating issues...?[/color]
>
> Yes.
>
> (The fact that threads, DLLs and similar stuff is off-topical on this
> group is irrelevant ;-))[/color]

Unless the right answer is really "No".

--
pete

"pete" <pfiland@mindspring.com> wrote in message
news:4000001D.7A0@mindspring.com...[color=blue]
> Peter Pichler wrote:[color=green]
> >
> > "Kumar" <kumar_gaurava@yahoo.co.uk> wrote in message
> > news:80965d4.0401100252.36997e2b@posting.google.co m...[color=darkred]
> > > If i am using static variable in a function, in say a dll.
> > > If that dll
> > > is being used by a multi-threaded program,
> > > will the static variable be
> > > safe to use? I mean, will it have the problems associated with using
> > > global variables in this case, i.e. same variable being modified by
> > > multiple threads, and hence creating issues...?[/color]
> >
> > Yes.
> >
> > (The fact that threads, DLLs and similar stuff is off-topical on this
> > group is irrelevant ;-))[/color]
>
> Unless the right answer is really "No".[/color]

It depends on the question ;-)

Peter Pichler wrote:[color=blue]
>
> "pete" <pfiland@mindspring.com> wrote in message
> news:4000001D.7A0@mindspring.com...[color=green]
> > Peter Pichler wrote:[color=darkred]
> > >
> > > "Kumar" <kumar_gaurava@yahoo.co.uk> wrote in message
> > > news:80965d4.0401100252.36997e2b@posting.google.co m...
> > > > If i am using static variable in a function, in say a dll.
> > > > If that dll
> > > > is being used by a multi-threaded program,
> > > > will the static variable be
> > > > safe to use? I mean, will it have the problems associated with using
> > > > global variables in this case, i.e. same variable being modified by
> > > > multiple threads, and hence creating issues...?
> > >
> > > Yes.
> > >
> > > (The fact that threads,
> > > DLLs and similar stuff is off-topical on this
> > > group is irrelevant ;-))[/color]
> >
> > Unless the right answer is really "No".[/color]
>
> It depends on the question ;-)[/color]

Anyway, you can convert a function from one that uses a
local static variable, to one that doesn't,
simply by replacing the local static variable
with a parameter which points to an
{automatic variable in the calling function}.

--
pete

Kumar wrote:[color=blue]
>
> If i am using static variable in a function, in say a dll. If that
> dll is being used by a multi-threaded program, will the static
> variable be safe to use? I mean, will it have the problems
> associated with using global variables in this case, i.e. same
> variable being modified by multiple threads, and hence creating
> issues...?[/color]

In a word, yes. A static variable is always a 'global', but with
restricted visibility.

--
Chuck F (cbfalconer@yahoo.com) (cbfalconer@worldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net> USE worldnet address!