C When To Use Volatile

C When To Use Volatile. When the /volatile:ms compiler option is used—by default when architectures other than ARM are targeted—the compiler generates extra code to maintain ordering among references to volatile objects in addition to maintaining ordering to references to other global objects. If you need to change anything in your code that is out of compiler reach you can use this volatile keyword before the variable for which you want to change the value.

C Tutorial Volatile Keyword - Tutoriel All (Martin Peterson)

It tells the compiler that the value of the variable may change at any time. When another running thread also uses the variable; or when there is a signal handler that may change the value of the variable. The volatile keyword forces the compiler to not store a copy of the variable in the registers and fetch it each time from memory.

The volatile keyword forces the compiler to not store a copy of the variable in the registers and fetch it each time from memory.

This is not surprising, as most C texts dismiss volatile in a C's volatile keyword is a qualifier that is applied to a variable when it is declared.

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When another running thread also uses the variable; or when there is a signal handler that may change the value of the variable. The volatile qualifier is to help compiler optimization avoid messing up th. It tells the compiler that the value of the variable may change at any time.

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