Parallel.For(): Update variable outside of loop
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by TSS
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Published on 2010-05-05T14:37:54Z
Indexed on
2010/05/06
12:08 UTC
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I'm just looking in to the new .NET 4.0 features. With that, I'm attempting a simple calculation using Parallel.For and a normal for(x;x;x) loop.
However, I'm getting different results about 50% of the time.
long sum = 0;
Parallel.For(1, 10000, y =>
{
sum += y;
}
);
Console.WriteLine(sum.ToString());
sum = 0;
for (int y = 1; y < 10000; y++)
{
sum += y;
}
Console.WriteLine(sum.ToString());
My guess is that the threads are trying to update "sum" at the same time.
Is there an obvious way around it?
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