Is there any lock-free malloc under BSD/BSD-like license?

Like NBmalloc: http://www.cse.chalmers.se/research/group/dcs/nbmalloc.html

Or Maged M. Michael's malloc: http://www.research.ibm.com/people/m/michael/pldi-2004.开发者_开发知识库pdf

Thanks!!

Jemalloc is BSD/BSD-like licensed. http://www.canonware.com/jemalloc/

There is also SuperMalloc which is licensed as dual GPL3/MIT https://github.com/kuszmaul/SuperMalloc

Can you say what is the meaning of "lock-free"?