Hi

I take a look into the patch, and here some comments.

1.
+
+       ereport(WARNING,
+                       (errmsg("could not wait for the termination of the 
backend with PID %d within %ld milliseconds",
+                                       pid, timeout)));
+

The code use %ld to print int64 type.
How about use INT64_FORMAT, which looks more appropriate. 

2.
+       if (timeout <= 0)
+       {
+               ereport(WARNING,
+                               (errmsg("timeout cannot be negative or zero: 
%ld", timeout)));
+               PG_RETURN_BOOL(r);
+       }

The same as 1.

3.
+pg_terminate_backend_and_wait(PG_FUNCTION_ARGS)
+{
+       int     pid = PG_GETARG_DATUM(0);

+pg_wait_backend(PG_FUNCTION_ARGS)
+{
+       int             pid = PG_GETARG_INT32(0);

The code use different macro to get pid,
How about use PG_GETARG_INT32(0) for each one.


I changed the status to 'wait on anthor'.
The others of the patch LGTM, 
I think it can be changed to Ready for Committer again, when this comment is 
confirmed.


Best regards,
houzj






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