How to do strict synchronous i/o on Windows?

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I need to simulate strict synchronous, round robin i/o to a group of
files. I am on Windows 7 32-bit.
fio is very nearly working, except that even with a queue depth of 1,
it is still resulting in a disk queue that is > 1, because the
"iodepth" parameter is not global - it is per thread. (correct?)

I've tried using the "sync" engine, however that doesn't work at all -
just spews out errors.

Any assistance much appreciated.

Greg.
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