io-multiplexing

name	io-multiplexing
description	High-performance I/O multiplexing including epoll, IOCP, kqueue, and io_uring
sasmp_version	1.3.0
version	2.0.0
bonded_agent	02-networking-specialist
bond_type	PRIMARY_BOND
parameters	{"required":["io_model"],"optional":["max_events","timeout_ms"],"validation":{"io_model":{"type":"string","enum":["epoll","iocp","kqueue","io_uring","select"]},"max_events":{"type":"integer","min":64,"max":10000,"default":1024},"timeout_ms":{"type":"integer","min":0,"max":1000,"default":16}}}
retry_config	{"max_attempts":1,"fallback":"blocking_io"}
observability	{"logging":{"level":"debug","fields":["events_count","wait_time_ms"]},"metrics":[{"name":"io_events_processed","type":"counter"},{"name":"io_wait_duration_ms","type":"histogram"}]}

I/O Multiplexing for Game Servers

Implement high-performance I/O handling for thousands of concurrent connections.

I/O Model Comparison

Model	Platform	Connections	Latency
epoll	Linux	100K+	Low
kqueue	BSD/macOS	100K+	Low
IOCP	Windows	100K+	Low
io_uring	Linux 5.1+	1M+	Lowest
select	All	~1000	Medium

Linux epoll

#include <sys/epoll.h>

int epollfd = epoll_create1(0);

// Add socket
struct epoll_event ev;
ev.events = EPOLLIN | EPOLLET;  // Edge-triggered
ev.data.fd = client_socket;
epoll_ctl(epollfd, EPOLL_CTL_ADD, client_socket, &ev);

// Event loop
struct epoll_event events[MAX_EVENTS];
while (running) {
    int nfds = epoll_wait(epollfd, events, MAX_EVENTS, timeout_ms);
    for (int i = 0; i < nfds; i++) {
        if (events[i].events & EPOLLIN) handleRead(events[i].data.fd);
        if (events[i].events & EPOLLOUT) handleWrite(events[i].data.fd);
    }
}

Linux io_uring

#include <liburing.h>

struct io_uring ring;
io_uring_queue_init(, &ring, );


 io_uring_get_sqe(&ring);
io_uring_prep_recv(sqe, socket_fd, buffer, BUFFER_SIZE, );
io_uring_sqe_set_data(sqe, &connection);
io_uring_submit(&ring);



io_uring_wait_cqe(&ring, &cqe);
Connection* conn = io_uring_cqe_get_data(cqe);
handleCompletion(conn, cqe->res);
io_uring_cqe_seen(&ring, cqe);