Inter-process communication (pipes, shared memory) in Operating Systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Inter-process Communication (IPC)?

IPC is a way for different processes running on the same or different computers to exchange data and signals to coordinate their actions.

beginner

How do pipes facilitate communication between processes?

Pipes allow one process to send data to another in a unidirectional flow, like a pipe carrying water from one place to another.

beginner

What is shared memory in IPC?

Shared memory is a method where multiple processes access the same memory space to read and write data quickly without copying it between processes.

intermediate

What is the main difference between pipes and shared memory?

Pipes send data in a stream from one process to another, while shared memory allows multiple processes to access the same memory area directly.

intermediate

Why is synchronization important in shared memory IPC?

Because multiple processes can access the same memory at the same time, synchronization prevents conflicts and ensures data is consistent and not corrupted.

Which IPC method allows data to flow in one direction between processes?

A Message queue

B Pipe

C Shared memory

D Semaphore

Pipes provide a unidirectional data flow from one process to another.

What is a key advantage of shared memory over pipes?

A Only works between parent and child processes

B Data is copied multiple times

C Faster data exchange by direct memory access

D Data flows only one way

Shared memory allows processes to access the same memory area directly, making data exchange faster.

Why do processes using shared memory need synchronization?

A To prevent data corruption from simultaneous access

B To increase data copying speed

C To allow unidirectional data flow

D To create separate memory spaces

Synchronization prevents conflicts when multiple processes access shared memory at the same time.

Which IPC method is typically simpler to use but slower for large data?

A Shared memory

B Signals

C Sockets

D Pipes

Pipes are simpler but involve copying data, which can be slower for large amounts.

In which scenario is shared memory most useful?

A When processes need to share large amounts of data efficiently

B When processes need to send small messages quickly

C When processes run on different machines

D When only one process is running

Shared memory is ideal for efficient sharing of large data between processes.

Explain how pipes work for inter-process communication and give a real-life example.

Think about how water flows through a pipe from one place to another.

Describe shared memory IPC and why synchronization is necessary.

Imagine several people writing on the same whiteboard at once.