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18f1236595
Unlinking before re-creating fixes the premature-EOF spin on unix, but Windows refuses to remove a file another handle still has open and returns a sharing violation. Because Create surfaces that error, every cache miss on a path with a live reader would have failed outright - worse than the spin it was meant to fix. Split the create behind a build tag: unix unlinks for a fresh inode, Windows keeps truncating in place and stays exposed to the spin, which is the behaviour it already had. The unix-only spec is skipped there.
16 lines
383 B
Go
16 lines
383 B
Go
//go:build windows
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package cache
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import (
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"os"
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"github.com/djherbis/stream"
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)
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// createDataFile truncates in place: Windows refuses to unlink a file another handle
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// has open, and failing the create would break every miss on a path with a live reader.
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func createDataFile(name string) (stream.File, error) {
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return os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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}
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