OS/161
LANGUAGE C
TIME January - April, 2018
DESCRIPTION
OS/161 is an educational operating system developed by Harvard University. It aims to assist computer developers to understand the underlying secrets of an operating system.
- Understood key operating system concepts, such as resource virtualization, protection and concurrency.
- Implemented native locking mechanism such as lock, semaphore and CV to ensure synchronization.
- Formulated virtual memory subsystem by implementing the MIPS software managed Translation Lookaside Buffer (TLB), paging, and page faults on Harvard's OS-161 kernel.
- Wrote system calls such as fork(), waitpid(), execv() and sbrk() to implement processes and threads.
| Sample Syscall Performance |
|---|
fork
Duplicates the running process with unique process id. Processes 0, 1, 2 & 3 are forked at various instances.
set break
Sets a process break (i.e. allocate memory). Dynamically changes the amount of space allocated for the data segment of the calling process.
wait
Waits on a process. Allows a process to wait until one of its child processes change its state. Correct sequence of letters are printed based on the implemented mechanism.