Simple Operating Systems （简称SOS）是一个可以运行在X86平台上（包括QEMU，BOCHS，VirtualBOX等模拟器上）的面向教学的微型嵌入式操作系统系列软件。从SOS-1到SOS9，逐步完成了一个从无（只有显示）到有（虚存、文件系统、线程、进程）的操作系统创建过程。通过分析、运行和修改此操作系统，会对操作系统的实际实现有更深入的的了解。这是第五部分SOS-5。-Simple Operating Systems (referred to as SOS) is a run on X86 platform (including QEMU, BOCHS, VirtualBOX simulator, etc.) teaching-oriented series of micro-embedded operating system software. From SOS-1 to SOS9, gradually completed a never (only display) to have (virtual memory, file system, thread, process) operating system creation process. Through the analysis, operation and revise the operating system, the actual realization of the operating system will have a better understanding. This is the fifth part of SOS-5.