# Module Netsys_pollset_posix

    module Netsys_pollset_posix: sig .. end

Pollsets for POSIX operating systems

    val poll_based_pollset : unit -> Netsys_pollset.pollset

Returns a poll set whose implementation is based on the `poll` system call.

Win32: On Win32 this implementation works, but only for sockets, and is not cancellable in multi-threaded programs. (This is a restriction because we have to map it to the `select` call of the WinSock layer.)

    val reset : unit -> unit

This module may keep some global state. This function resets this state. As the state may contain file descriptors, it is advisable to reset after calling `fork` to free these descriptors.

    val accelerated_pollset : unit -> Netsys_pollset.pollset

Returns a pollset using a "fast" poll mechanism, if available. Otherwise this is the same as `poll_based_pollset`.

Fast poll mechanisms are:

- `epoll` on Linux

Generally, these mechanisms are not 100% compatible with the standard `poll`. In particular, the poll events may be slightly differently interpreted. Also, there are many, many reports about buggy implementations in the OS.