Subclasses of PixelMemory implement this method to lock the memory.
Atalasoft.dotImage (in Atalasoft.dotImage.dll) Version: 22.214.171.124.0.297 (.NET 4.5.2, x86)
protected virtual void LLLock()
Protected Overridable Sub LLLock
LLLock is called by Lock only when it is necessary to actually lock the memory. Lock manages both thread
safety as well as accumulation of locks. For any number of calls to Lock without a call to Unlock, there will be
precisely one call to LLLock. It is also guaranteed that LLLock can only be called by one thread at a time.