Session 11

What are the benefits of using monitors instead of simple locks/semaphores?

• They can be escaped until some condition is met.

• They avoid spinning by using signaling mechanisms.

• They are a lower level mechanism and faster.

• There is no difference.

Re-checking a condition after returning from a wait usually isn't necessary.

• True

• False

Which is correct?

• Wait-freedom implies lock-freedom.

• Lock-freedom implies wait-freedom.

• Wait-freedom and lock-freedom are the same.

• Lock-freedom implies freedom from starvation.

Multiple concurrent reads of the same memory are a problem.

• True

• False

Multiple concurrent writes of the same memory are a problem.

• True

• False

One-thread-at-a-time is ideal for multiple concurrent reads and writes of the same memory.

• True

• False

We can use Java's synchronized statement as a reader/writer lock.

• True

• False