waitlatch流程

0）bgwriter进程调用waitlatch

(gdb) p set->epoll_fd
$1 = 3

1）backend调用setLatch

给bgwriter发sigusr1

2）bgwriter收到信号

往管道里写一个字符，退出信号处理函数

标签：waitlatch,调用,sigusr1,流程,epoll,bgwriter,gdb
来源： https://www.cnblogs.com/jiangshifu/p/15721527.html