add SendQ TrySend() TryRecv(); handle re-register.

lichao

2021-04-14 aa1542b6d6a4680088ac715c4ce40f97ada554fb

1
2
3
4
5
6
7
8
9
10
11
*.un~
build/
debug/
release/
Makefile
utest/utest
*.bak
gmon.out
box/bhshmqbox
box/bhshmq_center
box/help