volatile (computer programming) - Wikipedia

In computer programming, a variable is said to be volatile if its value can be read or modified asynchronously by something other than the current thread of execution. The value of a volatile variable may spontaneously change for reasons such as: sharing values with other threads; sharing values with asynchronous signal handlers; accessing hardware devices via memory-mapped I/O (where you can send

[aya_eiya]

volatileって恥ずかしながら知らなかったです。そう言われりゃそうだなってはなしだった。