Make taosHashGetSize thread-safe and rename function

src/client/src/tscLocal.c

@@ -920,7 +920,7 @@ int tscProcessLocalCmd(SSqlObj *pSql) {
   } else if (pCmd->command == TSDB_SQL_SHOW_CREATE_DATABASE) {
     pRes->code = tscProcessShowCreateDatabase(pSql); 
   } else if (pCmd->command == TSDB_SQL_RESET_CACHE) {
-    taosHashEmpty(tscTableMetaInfo);
+    taosHashClear(tscTableMetaInfo);
     pRes->code = TSDB_CODE_SUCCESS;
   } else if (pCmd->command == TSDB_SQL_SERV_VERSION) {
     pRes->code = tscProcessServerVer(pSql);

src/client/src/tscPrepare.c

@@ -1159,7 +1159,7 @@ static void insertBatchClean(STscStmt* pStmt) {
   pCmd->insertParam.pDataBlocks = tscDestroyBlockArrayList(pCmd->insertParam.pDataBlocks);
   pCmd->insertParam.numOfTables = 0;
 
-  taosHashEmpty(pCmd->insertParam.pTableBlockHashList);
+  taosHashClear(pCmd->insertParam.pTableBlockHashList);
   tscFreeSqlResult(pSql);
   tscFreeSubobj(pSql);
   tfree(pSql->pSubs);

src/client/src/tscServer.c

@@ -2309,7 +2309,7 @@ int tscProcessDropDbRsp(SSqlObj *pSql) {
   //TODO LOCK DB WHEN MODIFY IT
   //pSql->pTscObj->db[0] = 0;
   
-  taosHashEmpty(tscTableMetaInfo);
+  taosHashClear(tscTableMetaInfo);
   return 0;
 }
 
@@ -2340,7 +2340,7 @@ int tscProcessAlterTableMsgRsp(SSqlObj *pSql) {
   tfree(pTableMetaInfo->pTableMeta);
 
   if (isSuperTable) {  // if it is a super table, iterate the hashTable and remove all the childTableMeta
-    taosHashEmpty(tscTableMetaInfo);
+    taosHashClear(tscTableMetaInfo);
   }
 
   return 0;

src/tsdb/src/tsdbFS.c

@@ -771,7 +771,7 @@ int tsdbLoadMetaCache(STsdbRepo *pRepo, bool recoverMeta) {
   int64_t   maxBufSize = 0;
   SMFInfo   minfo;
 
-  taosHashEmpty(pfs->metaCache);
+  taosHashClear(pfs->metaCache);
 
   // No meta file, just return
   if (pfs->cstatus->pmf == NULL) return 0;

src/util/inc/hash.h

@@ -140,7 +140,7 @@ int32_t taosHashRemoveWithData(SHashObj *pHashObj, const void *key, size_t keyLe
 
 int32_t taosHashCondTraverse(SHashObj *pHashObj, bool (*fp)(void *, void *), void *param);
 
-void taosHashEmpty(SHashObj *pHashObj);
+void taosHashClear(SHashObj *pHashObj);
 
 /**
  * clean up hash table

src/util/src/hash.c

@@ -144,6 +144,14 @@ static FORCE_INLINE SHashNode *doUpdateHashNode(SHashObj *pHashObj, SHashEntry*
  */
 static void pushfrontNodeInEntryList(SHashEntry *pEntry, SHashNode *pNode);
 
+/**
+ * Check whether the hash table is empty or not.
+ *
+ * @param pHashObj the hash table object
+ * @return if the hash table is empty or not
+ */
+static FORCE_INLINE bool taosHashTableEmpty(const SHashObj *pHashObj);
+
 /**
  * Get the next element in hash table for iterator
  * @param pIter
@@ -195,7 +203,16 @@ void taosHashSetEqualFp(SHashObj *pHashObj, _equal_fn_t fp) {
   } 
 } 
 
-int32_t taosHashGetSize(const SHashObj *pHashObj) { return (int32_t)((pHashObj == NULL) ? 0 : pHashObj->size); }
+int32_t taosHashGetSize(const SHashObj *pHashObj) {
+  if (!pHashObj) {
+    return 0;
+  }
+  return (int32_t)atomic_load_64(&pHashObj->size);
+}
+
+static FORCE_INLINE bool taosHashTableEmpty(const SHashObj *pHashObj) {
+  return taosHashGetSize(pHashObj) == 0;
+}
 
 int32_t taosHashPut(SHashObj *pHashObj, const void *key, size_t keyLen, void *data, size_t size) {
   uint32_t   hashVal = (*pHashObj->hashFp)(key, (uint32_t)keyLen);
@@ -281,7 +298,7 @@ void *taosHashGet(SHashObj *pHashObj, const void *key, size_t keyLen) {
 }
 
 void* taosHashGetClone(SHashObj *pHashObj, const void *key, size_t keyLen, void (*fp)(void *), void* d, size_t dsize) {
-  if (pHashObj->size <= 0 || keyLen == 0 || key == NULL) {
+  if (taosHashTableEmpty(pHashObj) || keyLen == 0 || key == NULL) {
     return NULL;
   }
 
@@ -338,7 +355,7 @@ int32_t taosHashRemove(SHashObj *pHashObj, const void *key, size_t keyLen) {
 }
 
 int32_t taosHashRemoveWithData(SHashObj *pHashObj, const void *key, size_t keyLen, void *data, size_t dsize) {
-  if (pHashObj == NULL || pHashObj->size <= 0) {
+  if (pHashObj == NULL || taosHashTableEmpty(pHashObj)) {
     return -1;
   }
 
@@ -405,7 +422,7 @@ int32_t taosHashRemoveWithData(SHashObj *pHashObj, const void *key, size_t keyLe
 }
 
 int32_t taosHashCondTraverse(SHashObj *pHashObj, bool (*fp)(void *, void *), void *param) {
-  if (pHashObj == NULL || pHashObj->size == 0) {
+  if (pHashObj == NULL || taosHashTableEmpty(pHashObj)) {
     return 0;
   }
 
@@ -478,7 +495,7 @@ int32_t taosHashCondTraverse(SHashObj *pHashObj, bool (*fp)(void *, void *), voi
   return 0;
 }
 
-void taosHashEmpty(SHashObj *pHashObj) {
+void taosHashClear(SHashObj *pHashObj) {
   if (pHashObj == NULL) {
     return;
   }
@@ -517,7 +534,7 @@ void taosHashCleanup(SHashObj *pHashObj) {
     return;
   }
 
-  taosHashEmpty(pHashObj);
+  taosHashClear(pHashObj);
   tfree(pHashObj->hashList);
 
   // destroy mem block
@@ -535,7 +552,7 @@ void taosHashCleanup(SHashObj *pHashObj) {
 
 // for profile only
 int32_t taosHashGetMaxOverflowLinkLength(const SHashObj *pHashObj) {
-  if (pHashObj == NULL || pHashObj->size == 0) {
+  if (pHashObj == NULL || taosHashTableEmpty(pHashObj)) {
     return 0;
   }