1. Welcome
2. Fall 2020
3. CS3650 - Computer Systems
4. 3650 notes
5. 07 mmap
6. Data Races

Data Races

• Count example
• Discuss semaphores
  • Locks
• Second count example

Conditions for a data race:

• Concurrent execution of two processes / threads.
• Shared data that both processes access (read or write)
• At least one process writes

Barriers and data races:

• Review the barrier code.
• Figure out how it stops data races.

Deadlocks

• Real work example

Conditions for a deadlock:

• Circular wait.