add mutex timeout limit; use atomic as refcount.

lichao

2021-04-22 1d6c040dcb9a01648edc66d8c0006c8c9294a705

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