Eukaryotes. Eukaryotes are organisms made up of cells that possess a membrane-bound nucleus (that holds genetic material) as well as membrane-bound organelles. Genetic material in eukaryotes is contained within a nucleus within the cell and DNA is organized into chromosomes. Eukaryotic organisms may be multicellular or single-celled organisms. All animals are eukaryotes. Other eukaryotes include plants, fungi, and protists. A typical eukaryotic cell might contain the following parts: plasma membrane; nucleolus
A unique_lock can be created without immediately locking, can unlock at any point in its existence, and can transfer ownership of the lock from one instance to another. So you always use lock_guard, unless you need the capabilities of unique_lock. A condition_variable needs a unique_lock.
The reason people use this rather than the method level synchronized keyword (which locks on the executing class object's instance) is that they might want a finer-grained or different thing to wait for locking on, depending on how their multi-threaded algorithm is designed.hey'll have to wait for the key to become available. This is how such a lock construct works. The parameter to the synchronized keyword is the key in this case. You lock the key, do what you need to do, then you unlock the key to let others have access to it.