Pierre Habouzit
.@s_tolksdorf and as promised you can’t get more bare bones uncontended fast paths than that.
// @cocoawithlovepic.twitter.com/WbuuCFZ9tQ
Apple’s libplatform is now OSS too http://opensource.apple.com/source/libplatform/libplatform-125/ … with user-land os_unfair_lock (os/lock.c) in all its strict glory //@s_tolksdorf
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@pedantcoder Nice! (There's probably no way to replace the xchg in unlock with a store-release without making waiting much less efficient.) -
@s_tolksdorf we need the old value to know whether we need to wake waiters, so as you guessed, no. Your battery life depends on this. - View other replies
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@s_tolksdorf in practice that doesn’t make a difference on arm (xchg versus store-release), because the required release is what is costly.
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Stephan Tolksdorf
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