import perf

DUP = 4096

runner = perf.Runner()
for selector in ('SelectSelector', 'PollSelector', 'EpollSelector'):
    setup = ';'.join((
        'import os, selectors',
        's=selectors.%s()' % selector,
        'r,w=os.pipe()',
        's.register(r, selectors.EVENT_READ)'
    ))
    code = ';'.join((
        's.modify(r, selectors.EVENT_WRITE)',
        's.modify(r, selectors.EVENT_READ)',
    ))
    runner.timeit( '%s.modify' % selector, code, setup, duplicate=DUP)