NEW 178049
[Linux] Use futex directly for WordLock 
https://bugs.webkit.org/show_bug.cgi?id=178049
Summary [Linux] Use futex directly for WordLock
Yusuke Suzuki
Reported 2017-10-07 05:16:59 PDT
Let's use futex directly for WordLock.
Attachments
Patch (12.36 KB, patch)
2017-10-07 05:18 PDT, Yusuke Suzuki 		no flags
DetailsFormatted DiffDiff
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Yusuke Suzuki
Comment 1 2017-10-07 05:18:16 PDT
Created attachment 323095 [details] Patch
Yusuke Suzuki
Comment 2 2017-10-07 05:22:31 PDT
WIP. Super simple implementation. It just uses upper most bit for isLockedBit. And using the other 31bit for futexing threads counting. The problem is that it only accepts 31bit threads... I'm not sure this is ok for bmalloc/WTF requirement. If it is not acceptable, we should make this unsigned meaning to, 0: unlocked, 1: locked, 2: locked, and having pending threads as it can be seen in https://www.akkadia.org/drepper/futex.pdf.
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