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Grand Central Dispatch in Operating System

Posted on December 6, 2021December 6, 2021 By christo No Comments on Grand Central Dispatch in Operating System

Grand Central Dispatch (GCD)—a technology for Apple’s Mac OS X and iOS operating systems—is a combination of extensions to the C language, an API, and a run-time library that allows application developers to identify sections of code to run in parallel. Like OpenMP, GCD manages most of the details of threading

GCD identifies extensions to the C and C++ languages known as blocks. A block is simply a self-contained unit of work. It is specified by a caret ˆ inserted in front of a pair of braces { }. A simple example of a block is shown below:

ˆ{ printf("I am a block"); }

GCD schedules blocks for run-time execution by placing them on a dispatch queue. When it removes a block from a queue, it assigns the block to an available thread from the thread pool it manages. GCD identifies two types of dispatch queues: serial and concurrent

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