[asterisk-users] global variables and updates

[Julian Lyndon-Smith]

Thanks for all the replies and help - For future reference I eventually 
decided to go for a func_odbc solution and use a database sequence that 
*is* atomic and gives me what I needed.

Julian.

Julian Lyndon-Smith wrote:
> 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 ?
> 
> Julian.
> 
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