> On Jan 8, 2018, at 11:47, Fadi Botros <botros_f...@yahoo.com> wrote: > > 1st: How to invoke the thread sanitizer?
Check out this article on developer.apple.com: https://developer.apple.com/documentation/code_diagnostics/thread_sanitizer/enabling_the_thread_sanitizer > 2nd: I think making something like ConcurrentModificationException of Java > should be a little better experience (if it will not make, or make a small > performance penalty, also if it makes performance penalty, it would be > activated only when you make a debug version or non-optimized version) I don't exactly disagree, but my understanding is that the work to do such a thing is nearly equivalent to having thread sanitizer on all the time. But maybe there's a simpler model that we could still turn on in debug builds. Can you file a bug report requesting this now that bugs.swift.org is back up? Thanks! Jordan > > > من: Jordan Rose <jordan_r...@apple.com> > إلى: Fadi Botros <botros_f...@yahoo.com> > نسخة كربونية: "swift-users@swift.org" <swift-users@swift.org> > تاريخ الإرسال: الإثنين 8 يناير، 2018 9:14 م > الموضوع: Re: [swift-users] Swift 4.0 bug in concurrent array access > > That sounds expected to me. While Array values are thread-safe, writing to > the global variable 'array' from two different threads would be a race. You > can see this properly diagnosed if you enable Thread Sanitizer. > > Jordan > > P.S. bugs.swift.org <http://bugs.swift.org/> should be back up now, if you > find any other issues. > > >> On Jan 8, 2018, at 11:02, Fadi Botros via swift-users >> <swift-users@swift.org <mailto:swift-users@swift.org>> wrote: >> >> I'm on macOS Sierra 10.12.6, and using Swift 4.0 >> Tried to access the array concurrently to see whether is it synchronized or >> no >> import Foundation let global = DispatchQueue.global() var array: [Int] = [ - >> Pastebin.com <https://pastebin.com/PnvyM3Qn> >> >> >> import Foundation let global = DispatchQueue.global() var array: [Int... >> <https://pastebin.com/PnvyM3Qn> >> >> When tried to run it using the terminal >> This crash happened >> >> swift(69836,0x700002dc2000) malloc: *** error for object 0x7ffe4be237e0: >> pointer - Pastebin.com <https://pastebin.com/vrdKTfrP> >> >> >> swift(69836,0x700002dc2000) malloc: *** error for object 0x7ffe4be237e0: >> po... >> <https://pastebin.com/vrdKTfrP> >> >> Avoided this crash using Serial Dispatch Queue >> >> let otherDispatch = DispatchQueue(label: "another.dispatch.com >> <http://another.dispatch.com/>", >> qos: .default) >> func appending(_ i: Int) { >> otherDispatch.sync { array.append(i) } >> } >> >> >> >> Also tried to file this issue on bugs.swift.org <http://bugs.swift.org/>, >> and it appears your site is down (under maintainence) >> >> Sorry >> _______________________________________________ >> swift-users mailing list >> swift-users@swift.org <mailto:swift-users@swift.org> >> https://lists.swift.org/mailman/listinfo/swift-users > > >
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