Talk about Shared clone reentrant execution

[John.liu1019]

when the top VI set Shared clone reentrant execution,  does its subVIs need set  Shared clone reentrant execution?  does its subVIs auto follow the top VI ?

[santo_13]

No, subVI retain their own reentrancy config.

For example, VI-A calls VI-B, if VI-A is reentrant and VI-B is non reentrant, when multiple parallel instances of VI-A try to use the same instance of VI-B, one of the instances of VI-A use the VI-B and once it is released, only then the other instance of VI-A will get to use VI-B.

[crossrulz]

There is an old blog series (2012), but it is good information on this subject.  Start here: https://stravaro.com/lvjournal/2012/02/maintaining-state-1/ 

[billko]

I guess you can experiment for yourself.  Make a shared clone reentrant subVI, pop a non-reentrant subVI with a wait for five seconds, then place several copies in a top level VI.  Then make the subVI shared clone reentrant.  You should be able to interpret the results yourself...

PS I did this myself by accident and was annoyed with the results...