!837 修复修改系统时间后关闭集群，可能存在的walwriterauxiliary线程长时间阻塞在WaitLatch的问题

Merge pull request !837 from chenxiaobin/stop_fail

src/common/backend/port/unix_latch.cpp

@@ -423,6 +423,8 @@ int WaitLatchOrSocket(volatile Latch* latch, int wakeEvents, pgsocket sock, long
             cur_timeout = timeout - (long)INSTR_TIME_GET_MILLISEC(cur_time);
             if (cur_timeout < 0) {
                 cur_timeout = 0;
+            } else if (cur_timeout > timeout) {
+                cur_timeout = timeout;
             }
 
 #ifndef HAVE_POLL

src/gausskernel/process/postmaster/walwriterauxiliary.cpp

@@ -238,7 +238,7 @@ void WalWriterAuxiliaryMain(void)
             }
         }
 
-        rc = WaitLatch(&t_thrd.proc->procLatch, WL_TIMEOUT | WL_POSTMASTER_DEATH, cur_timeout);
+        rc = WaitLatch(&t_thrd.proc->procLatch, WL_LATCH_SET | WL_TIMEOUT | WL_POSTMASTER_DEATH, cur_timeout);
 
         if (rc & WL_POSTMASTER_DEATH) {
             gs_thread_exit(1);

src/gausskernel/storage/replication/heartbeat.cpp

@@ -174,11 +174,12 @@ static void delay_control(TimestampTz last_send_time)
     TimestampTz now = GetCurrentTimestamp();
     TimestampTz timeout = TimestampTzPlusMilliseconds(last_send_time, u_sess->attr.attr_common.dn_heartbeat_interval);
     TimestampDifference(now, timeout, &secs, &microsecs);
-    Assert(secs <= u_sess->attr.attr_common.dn_heartbeat_interval);
 
     /* If has exceeded send_interval, don't delay. */
     if (secs == 0 && microsecs == 0) {
         return;
+    } else if (secs > u_sess->attr.attr_common.dn_heartbeat_interval) {
+        secs = u_sess->attr.attr_common.dn_heartbeat_interval;
     }
 
     pg_usleep(secs * USECS_PER_SEC + microsecs);