Answer Posted / chandrashekar kalvacherla
volatile tells the compiler that this variable can get altered by ways that the compiler cannot deduce. As a consequence, the compiler will exclude that variable from optimizations and the code will always fetch the variables content from memory, even if it has done so before (no caching).
Imagine a hardware clock which is mapped into memory. You need some way to tell the compiler: whenever I access that variable (mapped to the hardware clock), I want you to actually fetch the content from there. Otherwise the compiler might just ask the clock once for the current time and use the cached value (in a processor register) throught the rest of the program.
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