1. Set the SIGINT signal handler of receiver workers to die() routine.

2. Set the SIGHUP signal handler of receiver workers to standard PostgresSigHupHandler() routine.
3. Add log messages for Cancel and Shutdown of BgwPool.
4. Change soft exit (BgwPoolShutdown) to hard exit (BgwPoolCancel) at the case of postmaster death.

Author: danolivo

src/bgwpool.c

@@ -123,10 +123,10 @@ BgwPoolMainLoop(BgwPool* poolDesc)
 	MtmBackgroundWorker = true;
 	MtmIsLogicalReceiver = true;
 
-	pqsignal(SIGINT, ApplyCancelHandler);
+	pqsignal(SIGINT, die);
 	pqsignal(SIGQUIT, BgwShutdownHandler);
 	pqsignal(SIGTERM, BgwShutdownHandler);
-	pqsignal(SIGHUP, ApplyCancelHandler);
+	pqsignal(SIGHUP, PostgresSigHupHandler);
 
 	// XXX: probably we should add static variable that signalizes that
 	// we are between pool->active += 1 and pool->active -= 1, so if
@@ -396,6 +396,8 @@ BgwPoolShutdown(BgwPool* poolDesc)
 			continue;
 		WaitForBackgroundWorkerShutdown(poolDesc->bgwhandles[i]);
 	}
+	elog(LOG, "Shutdown of the receiver workers pool. Pool name = %s",
+															poolDesc->poolName);
 }
 
 /*
@@ -429,4 +431,6 @@ BgwPoolCancel(BgwPool* poolDesc)
 	poolDesc->pending = 0;
 	poolDesc->producerBlocked = false;
 	memset(poolDesc->bgwhandles, 0, MtmMaxWorkers * sizeof(BackgroundWorkerHandle *));
+	elog(LOG, "Cancel of the receiver workers pool. Pool name = %s",
+															poolDesc->poolName);
 }

src/pglogical_receiver.c

@@ -702,7 +702,7 @@ pglogical_receiver_main(Datum main_arg)
 			/* Emergency bailout if postmaster has died */
 			if (rc & WL_POSTMASTER_DEATH)
 			{
-				BgwPoolShutdown(&Mtm->pools[nodeId-1]);
+				BgwPoolCancel(&Mtm->pools[nodeId-1]);
 				proc_exit(1);
 			}