fix sendq lock, use different mutexes for in,out.

lichao

2021-04-15 af86015d724e5edf001aa024fe7d8581c45cffd9

 .gitignore

@@ -6,3 +6,6 @@
utest/utest
*.bak
gmon.out
box/bhshmqbox
box/bhshmq_center
box/help