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dispatchQueue.async(flags: .barrier, execute: …) does not work. When executed on a concurrent queue, it executes as a normal block instead of a barrier block.
I'm leaving this open until the next Xcode beta so I can confirm that the project I first diagnosed this with works (that project is tracking Xcode betas rather than swift snapshots).
Environment
Xcode 8 beta 4
Apple Swift version 3.0 (swiftlang-800.0.41.2 clang-800.0.36)
OS X 10.11.6 (15G31)
Additional Detail from JIRA
md5: ff61bb039a743599a3c83b4cefb47e4d
Issue Description:
dispatchQueue.async(flags: .barrier, execute: …)
does not work. When executed on a concurrent queue, it executes as a normal block instead of a barrier block.Here's some code that reproduces the issue:
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