Can you explain what a Network poller is in the Go language and how it works?

Network poller in Go language is a mechanism responsible for efficiently waiting for input-output events on network connections.

Go uses an event-driven model where the poller monitors when network descriptors are ready for reading or writing, without blocking the program execution. This allows goroutines (lightweight Go threads) to work efficiently with the network without constant waiting.

The poller is based on system calls such as epoll (Linux), kqueue (BSD, macOS), or IOCP (Windows), which notify about the readiness of file descriptors.

When the poller receives an event, it wakes up the corresponding goroutine to process the data, ensuring high performance and scalability of network applications in Go.