add mutex timeout limit; use atomic as refcount.

lichao

2021-04-22 1d6c040dcb9a01648edc66d8c0006c8c9294a705

 .gitignore

@@ -6,7 +6,8 @@
utest/utest
*.bak
gmon.out
box/bhshmqbox
box/bhshmq_center
box/help
utest/bhshmq_center
*/bhshmq_center
*/help
*/bhshmqbox
*/bhshmq_status
.idea