A thread-safe chain of streaming elements is a composition of streaming elements in which one of the streaming elements is a synchronized filtered stream. Synchronized filtered streams ensure that each operation carried out on a stream is executed atomically in a multithreaded environment. Synchronized filtered streams can also be used in conjunction with guarded filtered streams to ensure that a group of operations are executed atomically in a multithreaded environment. For more information on the synchronized and guarded filtered streams, see Synchronized Streams and Guarded Streams.