NAME

       Coro::Select - a (slow but coro-aware) replacement for CORE::select

SYNOPSIS

        use Coro::Select;          # replace select globally (be careful, see below)
        use Core::Select 'select'; # only in this module
        use Coro::Select ();       # use Coro::Select::select

DESCRIPTION

       This module tries to create a fully working replacement for perl's "select" built-in,
       using "AnyEvent" watchers to do the job, so other threads can run in parallel to any
       select user. As many libraries that only have a blocking API do not use global variables
       and often use select (or IO::Select), this effectively makes most such libraries
       "somewhat" non-blocking w.r.t. other threads.

       This implementation works fastest when only very few bits are set in the fd set(s).

       To be effective globally, this module must be "use"'d before any other module that uses
       "select", so it should generally be the first module "use"'d in the main program. Note
       that overriding "select" globally might actually cause problems, as some "AnyEvent"
       backends use "select" themselves, and asking AnyEvent to use Coro::Select, which in turn
       asks AnyEvent will not quite work.

       You can also invoke it from the commandline as "perl -MCoro::Select".

       To override select only for a single module (e.g. "Net::DBus::Reactor"), use a code
       fragment like this to load it:

          {
             package Net::DBus::Reactor;
             use Coro::Select qw(select);
             use Net::DBus::Reactor;
          }

       Some modules (notably POE::Loop::Select) directly call "CORE::select". For these modules,
       we need to patch the opcode table by sandwiching it between calls to
       "Coro::Select::patch_pp_sselect" and "Coro::Select::unpatch_pp_sselect":

        BEGIN {
           use Coro::Select ();
           Coro::Select::patch_pp_sselect;
           require evil_poe_module_using_CORE::SELECT;
           Coro::Select::unpatch_pp_sselect;
        }

BUGS

       For performance reasons, Coro::Select's select function might not properly detect bad file
       descriptors (but relying on EBADF is inherently non-portable).

SEE ALSO

       Coro::LWP.

AUTHOR

        Marc Lehmann <schmorp@schmorp.de>
        http://home.schmorp.de/