Putting code in main of src/backend/main/main.c

HI,
We are working on a project where we want to create a single linked list  
that holds information of all the locks taken or being waited for by 
transactions in Postgresql. Since main in src/backend/main/main.c will be 
run just once when the Postgresql starts up, can declaration and 
initialization of this single linked list be put in this main?
Thank you
Sumaira

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