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epoll
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![EPOLL_CTL_DISABLE and multithreaded applications [LWN.net]](/imgres?imgurl=https://static.lwn.net/images/2012/epoll_API.png&imgrefurl=https://lwn.net/Articles/520012/&h=598&w=434&tbnid=MdbcxeG4173aFM&q=epoll&tbnh=135&tbnw=98&usg=AI4_-kS-VehIIWdULuCFsYFFNEisYGGbvw&vet=1&docid=fozNAFg42gowvM&sa=X&ved=2ahUKEwij0NnT0-CFAxU5Z_UHHQk_Ap4Q9QF6BAgAEAk)
epoll is a Linux kernel system call for a scalable I/O event notification mechanism, first introduced in version 2.5.45 of the Linux kernel. Its function is to monitor multiple file descriptors to see whether I/O is possible on any of them. Wikipedia