adjust pitr barrier time

Offering: openGaussDev

More detail: adjust pitr barrier time

Match-id-4bd3feb79953fdfe59ac34788c57d59b5a3e356b

src/gausskernel/process/postmaster/barrier_creator.cpp

@@ -57,13 +57,14 @@ void GetCsnBarrierName(char* barrierRet, bool isSwitchoverBarrier)
     struct timeval tv;
     int rc;
     CommitSeqNo csn;
-    
-    gettimeofday(&tv, NULL);
+
     if (GTM_MODE)
         csn = GetCSNGTM();
     else
         csn = CommitCSNGTM(false);
 
+    gettimeofday(&tv, NULL);
+
     if (isSwitchoverBarrier) {
         rc = snprintf_s(barrierRet, BARRIER_NAME_LEN, BARRIER_NAME_LEN - 1, CSN_SWITCHOVER_BARRIER_PATTREN_STR, csn);
     } else {