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

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venkat
venkat 2012-10-30
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...

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Kaustubha Govind
Kaustubha Govind 2012-10-31
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.
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venkat
venkat 2012-10-31
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.

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