Date: Tue, 22 Jan 2019 21:28:47 +0100 From: Markus Wichmann <nullplan@....net> To: musl@...ts.openwall.com Subject: MSB in rwlock? Hi all, would someone kindly explain what the highest bit in the rwlock value is doing? As far as I can see, it is set whenever one of the locking functions enters a contended case, and cleared when the unlock function sets the lock to 0 (so when the last reader or the writer unlocks the rwlock). But at any other point the bit is masked out, AFAICS. So what is it doing? Or is it just a vestige that can be done away with? Ciao, Markus
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