Clarification regarding managing advisory locks in postgresql

[Sasmit Utkarsh <utkarshsasmit@xxxxxxxxx>]

Hi Postgresql Team,

Need your support on understanding advisory locks in Postgresql and what is the best practice to have advisory locks and unlocks to work properly when we have multiple process forked from single process? is there any option for setting the locktype or please share a sample program using libpq in C explaining the above scenario if possible 

Regards,
Sasmit Utkarsh
+91-7674022625