[irishjohnnie]

IIRC, the data structure that they used was not thread-safe. There eventually had to be an interlocked compare exchange operation which slowed throughput. Also, I couldn't imagine this working correctly in out-of-order cores without memory barriers at the very least.

[ahoka]

Yes, you need to use CAS and barriers to make it thread safe. I have also used a condvar for the consumer to avoid spinning while waiting for log messages.