Chapter 27APIs: Web Workers
Every HTML5 app is written in JavaScript, but the single and the most
crucial limitation of HTML5 apps is that the browsers’ JavaScript runtimes
are single-threaded in nature. Some of you might say
that you have run tasks asynchronously in the past using functions like
setTimeout, setInterval, and our
all-time favorite, XMLHttpRequest. But, in reality, those
functions are just asynchronous, not concurrent. Actually, all JavaScript
tasks run one after the other and are queued accordingly. Web Workers offer
us a multi-threaded environment where multiple
threads can execute in parallel, offering true concurrency.
In this chapter, we’ll first discuss the purpose and how to use Web Workers, before having a look at some ...
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