C++ Multithreaded Application utilizing a Singleton Pattern with multiple parameters

**_ C++ Multithreaded Application utilizing a Singleton Pattern with multiple parameters _** An existing application creates an object locally in a .cpp file with new operator and within the object calls a function LoadPosKeys to load data row in to cache a few minutes after the program starts. Current proposal is to replace the object that’s gets created locally with a one instance globally accessible singleton pattern so there’s only one existing and double checked to permit access from anywhere and serialize access in a multi-threaded application for any thread accessing the singleton object. This is rather a request or bid for information to investigate the advantage and disadvantages and pros and cons and if there’s a better way of doing this so using threads and conditionals or this method would be fine. And also a few other questions that may arise if errors come and watch to look for. Will provide any further details as well if required. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform UNIX. Pthreads C++