Epoll

epoll is a Linux kernel system call, a scalable I/O event notification mechanism, first introduced in Linux kernel 2.5.44.[1] It is meant to replace the older POSIX select(2) and poll(2) system calls, to achieve better performance in more demanding applications, where the number of watched file descriptors is large (unlike the older system calls, which operate in O(n) time, epoll operates in O(1) time[2]). epoll is similar to FreeBSD's kqueue, in that it operates on a configurable kernel object, exposed to user space as a file descriptor of its own.

See also

• Input/Output
• kqueue
• IOCP
• Overlapped IO
• libevent
• Context switch

Favorite site

• Wikipedia (en) epoll에 대한 설명
• Joinc: epoll - 커널 2.4 기준
• C언어 epoll 설명
• GpgStudy - epoll 과연 대단한가?
• epoll 번역
• 고급 I/O 모델 : epoll() 함수
• [추천] (C언어) epoll 설명 ¹
• Epoll의 기초 개념 및 사용 방법

References

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1. Blueheartscabin.blogspot.com_-c-_epoll.pdf ↩