GitHub - yangsfang/Nachos-Operating-System: This is my implementation of Nachos with some modifications.

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This is my implementation of Nachos with some modifications.

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Name		Name	Last commit message	Last commit date
Latest commit History 93 Commits
.settings		.settings
nachos		nachos
print		print
test		test
.classpath		.classpath
.project		.project
COPYRIGHT		COPYRIGHT
DISK0		DISK0
EclipseProfile.xml		EclipseProfile.xml
Makefile		Makefile
README		README
README_HW0		README_HW0
README_HW1		README_HW1
README_HW2		README_HW2
README_HW3		README_HW3
README_HW4		README_HW4
README_HW5		README_HW5
machine.jar		machine.jar
makejavadoc		makejavadoc
nachos_file		nachos_file
prj.el		prj.el
run		run

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Nachos Operating System was developed by Thomas Anderson at University of Washington. Its first release came in 1992.
This is my implementation of Nachos, with the following modifications:

1.Implemented various system calls such as sleep(), exec(), join(), fork(), read(), write() and exit().
2.Implemented semaphores, thread scheduling and process management routines, 
  extending functionality of Nachos Operating System to handle Multithreading and User Programming.
3.Extended Nachos OS to implement Round Robin Scheduling, Multi Feedback Scheduling.
4.Built a Console Driver for Nachos.
5.Extended the functionality of the Nachos File system, implementing File Extension, Directory Structure,  Single and 
  Double Indirect Blocks.
6.Extended Nachos to support demand paged, memory mapped files by adding two new system calls- Mmap() and
  Munmap().

More information can be found at this link:
https://en.wikipedia.org/wiki/Not_Another_Completely_Heuristic_Operating_System