1. CS415 Minithreads Project 6 Overview
Adrian Bozdog (Adi)

2. What you have to do Default problem: Optional Problems:
Implement Virtual File System
Optional Problems:
Peer-to-peer file sharing
Secret sharing
Efficient data collection
Application Level Multicast Infrastructure
Quorum system
Software RAID
Sign up for the optional problems until Friday, April 18, 5pm
At most 5 groups allowed to work at an optional problem (FCFS policy)
One TA supervises an optional problem
In the first assignment you should implement a Minithread package at the user-level using a single threaded process. In fact, you should implement a package that can be used by multithreaded programs. The students who will finish the assignment early may try to add preemption to the package.

3. Virtual File System (1)
Uses a block-based interface which simulates a disk (disk.[ch]).
Translates block reads/writes to file accesses
Provides block-based disk operations
There is an NT thread assigned to each disk
Provides concurrency control
Multiple threads can access the file system
An interrupt is generated after each disk operation is completed
In the first assignment you should implement a Minithread package at the user-level using a single threaded process. In fact, you should implement a package that can be used by multithreaded programs. The students who will finish the assignment early may try to add preemption to the package.

4. Virtual File System (2) You need to write a disk interrupt handler
Receives a reply from each request
Return the result to the minithread that trigger the disk operation (the minithread must be blocked)
Disk results refer to block operations, not to user data operations
Only one thread is allowed to have disk operations that write data on a file (implement file-level concurrency control)
Disk organization:
Superblock:
Global information about the file system
Inodes:
Information about the file or directory they represent
In the first assignment you should implement a Minithread package at the user-level using a single threaded process. In fact, you should implement a package that can be used by multithreaded programs. The students who will finish the assignment early may try to add preemption to the package.

5. Optional problem supervisors
Peer-to-peer file sharing
Mark Robson (mr228)
Secret sharing
Niranjan Nagarajan
Efficient data collection
Alex Livshits (as246)
Application Level Multicast Infrastructure
Adi
Quorum system
Shafat
Software RAID
Alex Mochtchouk (anm23)
In the first assignment you should implement a Minithread package at the user-level using a single threaded process. In fact, you should implement a package that can be used by multithreaded programs. The students who will finish the assignment early may try to add preemption to the package.

6. Demo presentations Presentations will start May 7
Sign up sheet at 4119
Available at the end of semester (in 2-3 weeks)
I will put a message on CMS
15 minutes per group
In the first assignment you should implement a Minithread package at the user-level using a single threaded process. In fact, you should implement a package that can be used by multithreaded programs. The students who will finish the assignment early may try to add preemption to the package.