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

lichao

2021-04-15 af86015d724e5edf001aa024fe7d8581c45cffd9

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*.un~
build/
debug/
release/
Makefile
utest/utest
*.bak
gmon.out
box/bhshmqbox
box/bhshmq_center
box/help