#Introduction

This is my implementation to Stanford's CS140 Pintos Project. Pintos is a simple operating system framework for the 80x86 architecture. It supports kernel threads, loading and running user programs, and a file system,but it implements all of these in a very simple way.

#Feature List

• Avoid alarm clock's busy waiting.
• Priority Scheduling Support.
• A multilevel feedback queue scheduler similar to the 4.4BSD scheduler.
• Implement argument passing to user program.
• Basic system call framework.
• Lazy loading of a user program.
• Stack growth support.
• Implement memory mapped files system call.

#TODO

• Fix the bugs of virtual memory implement.
• Strengthen the file system implementation.
• Socket API implementation.
• Support multi-core processors.