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Programming Language Features

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C volatile Objects declared as volatile are omitted from optimization because their values can be changed by code outside the scope of current code at any time. The system always reads the current value of a volatile object from the memory location rather than keeping its value in temporary register at the point it is requested, even if a previous instruction asked for a value from the same object. So the simple question is, how can value of a variable change in such a way that compiler cannot predict. Consider the following cases for answer to this question. Global variables modified by an interrupt service routine outside the scope Global variables within a multi-threaded application https://www.geeksforgeeks.org/understanding-volatile-qualifier-in-c/ C storage classes there are four storage classes: automatic , register , external , and static .  auto The scope of automatic variables is local to the block in which they are declared, inc...
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Core Data

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Core Data is an object-graph management and persistence framework Core Data stack A Core Data stack is composed of the following objects: one or more managed object contexts connected to a single persistent store coordinator which is in turn connected to one or more persistent stores. A stack contains all the Core Data components you need to fetch, create, and manipulate managed objects. Minimally it contains: An external persistent store that contains saved records.  A persistent object store that maps between records in the store and objects in your application.  A persistent store coordinator that aggregates all the stores.  A managed object model that describes the entities in the stores.  A managed object context that provides a scratch pad for managed objects.  Managed object A managed object is a model object (in the model-view-controller sense) that represents a record from a persistent store. A managed object is an instance...
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Server - Database

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Shared Hosting: Multiple Web Site in a single server which is the functionality of web server application, uses different http folder for each site. Virtual Private server: Web Server is differnent for each web app with own OS. Single Machine has can have multiple OS through virtualization or may have different Machine which is connected with a Proxy server. Proxy server decides which request forward to which machine or which vm machine same. Load Balancing: A load balancing setup includes a load-balancing virtual server and multiple load-balanced application servers. The virtual server receives incoming client requests, uses the load balancing algorithm to select an application server, and forwards the requests to the selected application server. Concurrent Request This is configurable by selecting multi-process or mutli-thread. where number of max thread can be selected. After reaching that max number of thread, new process will be created. Also, queue mechanism can ...
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