Forum Discussion
kendalladkins_5
Nimbostratus
NimbostratusVariable Scope & Lifetime
I am relatively new to iRule development and I need a little help understanding variable scope. My main objective is to understand how I pass values from the HTTP_REQUEST event to the HTTP_RESPONSE ev...
That's correct, global variables are not shared across TMMs, rather 1 is maintained per TMM, separately.
From PD:
Each TMM has it's own copy of the global variables.... That's why we added logic to the Tcl syntax checker to detect the use of globals and disable CMP for any virtuals that are using iRules that use global variables. However, the detection logic certainly isn't foolproof and if someone has disabled syntax checking or otherwise obfuscated their use of global variables, then we won't detect them and thus not disable CMP.This limitation will be removed in an upcoming release. Until then, the best way to share global data between TMMs is to store it in the session table using the session command: (Click here)
HTH
/deb