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Introduction to I/O Multiplexing In traditional I/O models, functions like read() and write() handle both the waiting phase and the data transfer phase of I/O operations. Since I/O efficiency is primarily determined by waiting time, a new paradigm emerged: delegate the waiting process to a dedicated mechanism that monitors multiple file descrip ...

Non-Blocking I/O The recv function can operate in a non-blocking manner by passing the MSG_DONTWAIT flag as its final argument, though this approach is often cumbersome for consistent behavior. A more persistent method involves specifying the O_NONBLOCK flag during the open system call. Alternatively, the fcntl function modifies the status flag ...

I/O multiplexing is essential for handling high concurrency. Before Linux 2.6, select and poll were the primary mechanisms, but they struggle with massive connection counts. epoll resolves these limitations through an optimized architecture.Limitations of Select and PollWhen managing hundreds of thousands of connections where only a small fract ...