[Asterisk-Users] Global variables - collision?

[Koen Van Impe]

If I edit the value of a global variable in my dialplan, could there be a
risk of collision between calls?

More in details: could a global var be used to build a counter that will be
incremented by every call that passes.
I think when 2 calls come in almost sumiltaneously, they could both be
incrementing and saving the same value... which is bad!

Anybody knows how asterisk handles this?

K
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