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Implement Message Queues for Structured IPC

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Synchronize Shared Memory Access with Semaphores Implement Signal Handling for Inter-Process Notification

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Implementation

Implement message queue producer-consumer.

Requirements:

Create message queue with msgget()
Define message structure with type and data
Producer: send messages with different types
Consumer: receive messages by type
Use msgsnd() to send messages
Use msgrcv() to receive messages
Show prioritized delivery (lower type = higher priority)
Remove queue with msgctl()

Test:

Create message queue
Send messages with types 1, 2, 3
Receive messages (show priority ordering)
Receive specific type
Clean up queue

Why This Matters

System V message queues predate and directly inspired the message-type-and-priority model that production brokers like RabbitMQ and ZeroMQ still expose today, letting unrelated processes exchange structured, typed messages without the strict FIFO-only constraint of a pipe. The kernel persistence this task highlights is a double-edged sword in practice: forgotten message queues from crashed test programs are a classic source of `/proc/sys/kernel/msgmni` exhaustion on long-running Linux servers, which is exactly why `ipcs`/`ipcrm` exist.

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main.c

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