On 07/06/2018 10:49, Viresh Kumar wrote: > On 07-06-18, 10:46, Daniel Lezcano wrote: >> Yes, correct. >> >> But if we don't care about who wins to store to value, is there a risk >> of scramble variable if we just assign a value ? > > Normally no, as the compiler wouldn't screw it up badly. But there is no rule > which stops the compiler from doing this: > > idle_duration_ms = 5; > idle_duration_ms = -5; > idle_duration_ms = 0; > idle_duration_ms = <real-value-we-want-to-write>; > > So we *must* use READ/WRITE_ONCE() to make sure garbage values aren't seen by > readers.
Ok understood. Why would a compiler do this kind of things ? -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
