Explain IO multiplexing, select, poll, epoll in detail

IO Multiplexing

  Follow the previous article , Optimize IO Two data operations of

First of all, understand Linux File descriptors in

  According to monitoring FD Different , There are three modes   select   ,poll  ,epoll

  Next, we will explain their differences and implementation

 1.select The implementation of the And shortcomings

  Process performed

  2. poll The implementation of the

3. epoll Improvement

      Array is not being copied , How to use handle , Create a new structure

      The total event of red and black trees , The event that the linked list is ready for storage , Realization Find the specific number

      Can really customize Number of listeners

summary

Expand io Multiplex Event notification mechanism

be based on epoll Of web Service process