[asterisk-users] global variables and updates

[Al lists]

Not sure what you are doing with meetme but,
i Always used AstDB() for this type of needs.


On 7/28/07, Lee Jenkins <lee at datatrakpos.com> wrote:
>
> Watkins, Bradley wrote:
> > The contents of this e-mail are intended for the named addressee only.
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> >> From: asterisk-users-bounces at lists.digium.com
> >> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of
> >> Julian Lyndon-Smith
> >> Sent: Saturday, July 28, 2007 5:18 AM
> >> To: asterisk-users at lists.digium.com
> >> Subject: [asterisk-users] global variables and updates
> >>
> >> Sorry if this appears twice - I originally sent it nearly 18
> >> hours ago
> >> and never saw it ..
> >>
> >> I have a need to have a unique integer number that can be used by a
> >> dynamic meetme room (I am wanting to redirect a call into a meeting
> >> room, and need a unique number to make sure I don't put two people
> >> together !)
> >>
> >> I was going to use a global variable ${NEXTMEETME}, and add one every
> >> time I redirect.
> >>
> >> Is the changing of a global variable atomic ? That is, if I
> >> have two or
> >> more channels being redirected at the same time, and they all execute
> >>
> >> exten => _X.,n,Set(NEXTMEETME=${MATH(${NEXTMEETME}+1,i)})
> >> exten => _X.,n,Set(MYMEETME=${NEXTMEETME})
> >>
> >> if NEXTMEETME is initially 0, would channel A get MYMEETME as
> >> 1, channel
> >> B get 2 and channel C get 3, even if they execute the dialplan at the
> >> same time ?
> >>
> >
> > The changing of variables is not atomic as would hope, but there is a
> > solution for you.  Look the application MacroExclusive.  Put your Set to
> > increment the global variable inside of a macro and call it using this,
> > and you will get the behavior you desire.  One caveat, however, is that
> > you will want as little logic as possible inside of this macro.
> > MacroExclusive will block all other calls to this macro until the first
> > one exits.  But this is not an issue if all you are doing is a quick
> > var++ and then leaving.
> >
>
> That's a very nice feature.  A quick Google search on the wiki didn't
> turn up any topics.  Does it queue subsequent calls or just block them
> and then logic in the dialplan must be used against a return value?
>
> ---
> Warm Regards,
>
> Lee
>
>
>
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