fix-notice-before-waiting.patch

diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 6ab19b1..e97fef1 100644
*** a/src/test/isolation/isolationtester.c
--- b/src/test/isolation/isolationtester.c
*************** try_complete_step(Step *step, int flags)
*** 752,757 ****
--- 752,777 ----
  
  				if (waiting)	/* waiting to acquire a lock */
  				{
+ 					/*
+ 					 * Since it takes time to perform the lock-check query,
+ 					 * some data --- notably, NOTICE messages --- might have
+ 					 * arrived since we looked.  We should do PQconsumeInput
+ 					 * to process any such messages, and we might as well then
+ 					 * check PQisBusy, though it's unlikely to succeed.
+ 					 */
+ 					if (!PQconsumeInput(conn))
+ 					{
+ 						fprintf(stderr, "PQconsumeInput failed: %s\n",
+ 								PQerrorMessage(conn));
+ 						exit(1);
+ 					}
+ 					if (!PQisBusy(conn))
+ 						break;
+ 
+ 					/*
+ 					 * conn is still busy, so conclude that the step really is
+ 					 * waiting.
+ 					 */
  					if (!(flags & STEP_RETRY))
  						printf("step %s: %s <waiting ...>\n",
  							   step->name, step->sql);