remove unused header

fix typo

format code to save lines.

remove unnecessary qualifier.

passive disconnect & remove TcpConnection.

format code to save blank lines.

no double underscores.

format long lines.

Keep test3.cc all the same across steps.

Add diff files.

set quit_ to false before looping.

EventLoop::runInLoop(), wakeup a loop with eventfd.

update test1.cc, creating two threads.

timer queue works.

copy s02 from s01.