RTW : Why is errorStatus in Release 14 SP3 & R2006b is declared differently?

The errorStatus in R14 SP3 is declared as 'const' whereas from R2006b it is being declared as 'const volatile'. Why is it declared so? how can i avoid this change? please help...

[Kaustubha Govind]

What is the System Target File selected?

[venkat]

ert

Answer 1

[Kaustubha Govind]

Not sure, but perhaps it is expected that there might be external hardware drivers that could update the errorStatus flag? I don't know if this can be avoided - it is best to contact MathWorks Tech Support for this question to get an authoritative answer.

[venkat]

Got it. The volatile type specifier tells the compiler that some other thread can change the value unexpectedly and the compiler must not load the error flag into a register

To some extent this compromises the code optimisation, but whats more important is whether the compiler is referring the updated value.

Thank you KG & Mathworks Tech Support for your responses.

[Kaustubha Govind]

venkat: Thanks for posting a more detailed explanation. :)