[TD-6169]<fix>: windows dll client can not quit.

src/util/src/tcache.c

@@ -71,7 +71,8 @@ static pthread_once_t cacheThreadInit = PTHREAD_ONCE_INIT;
 static pthread_mutex_t guard          = PTHREAD_MUTEX_INITIALIZER;
 static SArray* pCacheArrayList        = NULL;
 static bool    stopRefreshWorker      = false;
-static bool    refreshWorkerStopped   = false;
+static bool    refreshWorkerNormalStopped       = false;
+static bool    refreshWorkerUnexpectedStopped   = false;
 
 static void doInitRefreshThread(void) {
   pCacheArrayList = taosArrayInit(4, POINTER_BYTES);
@@ -538,9 +539,10 @@ void taosCacheCleanup(SCacheObj *pCacheObj) {
   pCacheObj->deleting = 1;
 
   // wait for the refresh thread quit before destroying the cache object.
+  // But in the dll, the child thread will be killed before atexit takes effect.
   while(atomic_load_8(&pCacheObj->deleting) != 0) {
-    if (refreshWorkerUnexpectedStopped) return;    
     if (refreshWorkerNormalStopped) break;    
+    if (refreshWorkerUnexpectedStopped) return;    
     taosMsleep(50);
   }
 
@@ -693,7 +695,6 @@ void* taosCacheTimedRefresh(void *handle) {
 
   const int32_t SLEEP_DURATION = 500; //500 ms
   int64_t count = 0;
-
   atexit(taosCacheRefreshWorkerUnexpectedStopped);
 
   while(1) {
@@ -774,6 +775,6 @@ void taosCacheRefresh(SCacheObj *pCacheObj, __cache_free_fn_t fp) {
   doCacheRefresh(pCacheObj, now, fp);
 }
 
-void taosStopCacheRefreshWorker() {
-  stopRefreshWorker = false;
+void taosStopCacheRefreshWorker(void) {
+  stopRefreshWorker = true;
 }
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