dblink_is_busy
Name
dblink_is_busy -- checks if connection is busy with an async query
Synopsis
dblink_is_busy(text connname) returns int
Description
    dblink_is_busy tests whether an async query is in progress.
   
Arguments
- conname
-        Name of the connection to check.
       
Return Value
    Returns 1 if connection is busy, 0 if it is not busy.
    If this function returns 0, it is guaranteed that
    dblink_get_result will not block.
   
Examples
SELECT dblink_is_busy('dtest1');