POSIX

POSIX: In a POSIX-based dashboard system where a speed sensor process and a fuel sensor process send their status updates to the parent dashboard process, explain how POSIX features such as fork(), pipe(), read(), write(), wait(), copy-on-write memory, scheduling, and process queues are used in practice. Explain how these features coordinate the parent and child processes to ensure that speed and fuel data are safely transmitted, synchronized, and displayed on the dashboard.

Design, with a neat sketch, a multithreaded model for an embedded multimedia device in which audio playback, video rendering, and user interaction execute concurrently. Write suitable Pthread pseudocode to create and manage separate threads for audio processing, video display, and user input handling.

A smart city project collects huge amounts of data for prediction and analysis. There are three processes executing simultaneously. Build the three processes using POSIX and incorporate scheduling.

A database system allows multiple clients to read data simultaneously, but only one client can write data at a time. Using POSIX semaphores, implement a solution that allows concurrent reads, ensures exclusive access for writes, and prevents starvation of readers or writers. Explain the role of each semaphore and provide a suitable implementation.