/* * LockShardDistributionMetadata returns after grabbing a lock for distribution * metadata related to the specified shard, blocking if required. ExclusiveLock * and ShareLock modes are supported. Any locks acquired using this method are * released at transaction end. */ void LockShardDistributionMetadata(int64 shardId, LOCKMODE lockMode) { LOCKTAG tag; const bool sessionLock = false; const bool dontWait = false; SET_LOCKTAG_SHARD_METADATA_RESOURCE(tag, MyDatabaseId, shardId); (void) LockAcquire(&tag, lockMode, sessionLock, dontWait); }
/* * TryLockShardDistributionMetadata tries to grab a lock for distribution * metadata related to the specified shard, returning false if the lock * is currently taken. Any locks acquired using this method are released * at transaction end. */ bool TryLockShardDistributionMetadata(int64 shardId, LOCKMODE lockMode) { LOCKTAG tag; const bool sessionLock = false; const bool dontWait = true; bool lockAcquired = false; SET_LOCKTAG_SHARD_METADATA_RESOURCE(tag, MyDatabaseId, shardId); lockAcquired = LockAcquire(&tag, lockMode, sessionLock, dontWait); return lockAcquired; }