Method: Cod::Select#do

Defined in:
lib/cod/select.rb

#do ⇒ Hash, ...

Performs the IO.select and returns a thinned out version of that initial groups, containing only FDs and channels that are ready for reading.

Returns:



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# File 'lib/cod/select.rb', line 37

def do
  fds = groups.values { |e| to_read_fd(e) }.compact
  
  # Perform select  
  r,w,e = IO.select(fds, nil, nil, timeout)

  # Nothing is ready if r is nil
  return groups.empty unless r
  
  # Prepare a return value: The original hash, where the fds are ready.
  groups.
    keep_if { |e| r.include?(to_read_fd(e)) }.
    unpack
end