Immediate IO in ReadFile / WriteFile

[Martin Wilck]

What about the following idea:

Instead of doing an explicit immediate IO operation in e.g. ReadFile(),
que an asynchronous request by calling ReadFileEx() as if no data were
available. Then issue a

	WaitForSingleObject (overlapped->hEvent, 0) /* zero timeout ! */

to see if the request can be handled immediately. Apart from preserving
request order, this would also ensure that previous async requests are
actually scheduled.

Opinions?

Martin

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