LC

Implement Shared Memory for Fast IPC

medium4/8

Implement Unix Domain Sockets for Local IPC Synchronize Shared Memory Access with Semaphores

Language

Compiler

2.0s Limit 256MB

Implementation

Implement shared memory producer-consumer.

Requirements:

Create shared memory segment with shmget()
Attach segment with shmat()
Writer process: write data to shared memory
Reader process: read data from shared memory
Detach with shmdt()
Remove segment with shmctl()
Use simple busy-wait for synchronization
Demonstrate zero-copy data transfer

Test:

Create shared memory
Write message from producer
Read message from consumer
Detach and cleanup

Why This Matters

PostgreSQL's shared buffer pool and Chrome's GPU compositor both rely on SysV or POSIX shared memory for exactly the reason this task highlights: zero-copy access is dramatically faster than message-passing IPC for large, frequently-touched data. The task's warning about missing synchronization is a real operational hazard too, since orphaned `shmget` segments that outlive their creating process are a well-known source of production memory leaks, which is why `ipcs`/`ipcrm` exist as cleanup tools.

Hints

0 / 3 revealed

Validation Suite

main.c

Workspace 1.0