tree 177ab231a95cd539903d8d342f375fcfff34deff
parent 3a53acc96bf988b162d8e722e7d68b865b9831a0
author Taizeng Wu <wutaizeng@gmail.com> 1543998609 +0800
committer Taizeng Wu <wutaizeng@gmail.com> 1543998609 +0800

Use channel to implement a simple way to wait