OS Memory Management Quiz and Flashcards: Questions and Answers

Questions and Answers

To define the logical address space and ensure memory protection (correct)

To increase access speed and decrease access time

To provide direct access to secondary storage

To allocate memory to processes and manage CPU registers

To sit between main memory and CPU registers, increasing access speed (correct)

To store programs and data directly referenced by the CPU

To directly interface with the CPU and execute instructions

To provide long-term storage for programs and data

To manage input/output operations

To provide direct access to secondary storage

To store programs and data for direct CPU access (correct)

To execute program instructions directly

To bring a program into memory and place it within a process for execution Signup and view all the answers

To ensure that each memory access generated in user mode is within the defined limits of the logical address space Signup and view all the answers

Data race condition Signup and view all the answers

Semaphore Signup and view all the answers

Critical section Signup and view all the answers

The value cannot be predicted correctly due to the presence of a race condition Signup and view all the answers

Read, Modify, Write Signup and view all the answers

Study Notes

The base and limit registers define the boundaries of a process's memory space, preventing it from accessing memory outside its allocated area.

Cache storage acts as a buffer between main memory and the CPU, storing frequently accessed data to improve access speed and reduce latency.

Main memory temporarily stores data and program instructions the CPU uses to execute tasks.
Its primary functions include:
- Storing data temporarily while it's being processed
- Holding program instructions for execution

Address binding translates symbolic addresses used in a program into physical memory addresses during program execution.

Memory protection ensures that each process runs in its own allocated memory space, preventing one process from accessing or altering another process's memory.

The condition where concurrent access to shared data may result in data inconsistency is called a "race condition."
In process synchronization, "mutex" (mutual exclusion) is used to ensure the orderly execution of cooperating processes by preventing simultaneous access to shared resources.
A "critical section" is the portion of code that needs to be executed as an atomic action, without interruption from other processes.

If both threads (t1 and t2) concurrently call the getIncrement method once, assuming the initial value of the counter was 0, the final value of the counter variable would be indeterminate due to the non-atomic nature of the increment operation.

The 'counter++' operation involves three CPU operations:
- Load: retrieving the current value of the counter
- Increment: adding 1 to the current value
- Store: storing the updated value back into memory