Senior LevelNode JS
How does libuv use kernel I/O multiplexing (epoll on Linux, kqueue on macOS, IOCP on Windows) for non-blocking sockets?
❓ Interview Prompt: Explain libuv kernel I/O multiplexing, epoll_wait on Linux, kqueue on macOS, IOCP on Windows, and event loop polling.
Instead of polling thousands of sockets in a loop, libuv registers socket file descriptors with OS event notification subsystems ('epoll_wait' on Linux, 'kqueue' on macOS, 'IOCP' on Windows):
Kernel Multiplexing Mechanics:
The OS kernel puts the Node.js process thread to sleep and wakes it instantly when network data arrives on any socket, achieving scalable $O(1)$ event notifications!
Code Implementation Example
javascript
console.log('libuv delegates socket multiplexing to OS kernel epoll/kqueue');💡libuv kernel I/O multiplexing architecture.
🎯 Interview Key Takeaway
libuv delegates non-blocking socket I/O multiplexing to OS kernel subsystems (epoll/kqueue/IOCP).
#libuv#epoll#kqueue#IOCP#Senior
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