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OSSpinLock is unsafe in iOS #43

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vampirewalk opened this issue Jan 14, 2016 · 2 comments
Closed

OSSpinLock is unsafe in iOS #43

vampirewalk opened this issue Jan 14, 2016 · 2 comments
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@vampirewalk
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@vampirewalk vampirewalk commented Jan 14, 2016

Hi ibireme, thank you for bring us this great library.
My concern is that OSSpinLock is unsafe in iOS. It does not guarantee progress in the face of priority inversion.

http://mjtsai.com/blog/2015/12/16/osspinlock-is-unsafe/
https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20151214/000372.html

@ibireme
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@ibireme ibireme commented Jan 14, 2016

Thanks very much!
I'll do some research and fix it later.

ibireme added a commit that referenced this issue Jan 15, 2016
Apple engineers have pointed out that OSSpinLocks are vulnerable to live locking
on iOS in cases of priority inversion:

. http://mjtsai.com/blog/2015/12/16/osspinlock-is-unsafe/
. https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20151214/000372.html
@ibireme
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@ibireme ibireme commented Jan 17, 2016

Fixed

@ibireme ibireme closed this Jan 17, 2016
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