In some articles about algorithm, some use the word lockfree, and some use lockless. What's the difference between lockless and lockfree? Thanks!
Update
http://www.intel.com/content/dam/www/public/us/en/documents/guides/intel-dpdk-programmers-guide.pdf
section 5.2 --"Lockless Ring Buffer in Linux*", it's a example of use word "lockless"