For better system performances, we adopt some techniques to improve system's real-time performance, optimize parallelism of program using threads instead of processes, and realize kernel data integrity using reentrant program. 为了实现良好的系统性能,采取多种技巧提高系统的实时性,利用线程代替进程提高程序的并行度,运用代码的可重入性实现内核数据的完整性。