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

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venkat
venkat am 30 Okt. 2012
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 am 31 Okt. 2012
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 am 31 Okt. 2012
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
Kaustubha Govind am 2 Nov. 2012
venkat: Thanks for posting a more detailed explanation. :)

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