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Foil 40 Firstprivate and Lastprivate (2)

From Designing and Building Parallel Programs 2: openMP Shared Memory Programming Language DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel(Some foils prepared by Kuck & Associates, Inc.)
Parallelizing a loop and not knowing whether there are side effects?
subroutine foo(n)
common /foobar/a(1000),b(1000),x
c$omp parallel do shared(a,b,n) lastprivate(x)
do 10 i=1,n
x=a(i)**2 + b(i)**2
10 b(i)= sqrt(x)
end
Use lastprivate because don't
know where or if x in common
/foobar/ will be used again

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