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');