Make asyncMap to prevent from race-condition #1492
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giginet
commented
Aug 7, 2024
| @@ -89,12 +89,13 @@ public class Glob: Collection { | |||
| } | |||
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| let patterns = behavior.supportsGlobstar ? expandGlobstar(pattern: adjustedPattern) : [adjustedPattern] | |||
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| let isIncludingFiles = includeFiles | |||
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This closure made @Sendable closure, so it's better to avoid passing mutable variables
freddi-kit
reviewed
Aug 7, 2024
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| var buffer = ContiguousArray<T?>(repeating: nil, count: count) | ||
| DispatchQueue.concurrentPerform(iterations: count) { idx in | ||
| buffer[idx] = transform(self[idx]) | ||
| } | ||
| return buffer.map { $0! } |
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tab/space is not unified
giginet
commented
Aug 7, 2024
| func parallelMap<T>(transform: @Sendable (Element) -> T) -> [T] { | ||
| var buffer = ContiguousArray<T?>(repeating: nil, count: count) | ||
| DispatchQueue.concurrentPerform(iterations: count) { idx in | ||
| buffer[idx] = transform(self[idx]) |
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This implementation is dangerous, it may cause a race-condition...
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This PR seems to pass the test and builds, but I'm concerned that this change is breaking thread-safe... 🤔 The best solution is to replace the modern concurrency mechanism, but it's tough to introduce Swift Concurrency to this project. |
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This issue seems to be fixed on Beta 6 |
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closes #1491
Build failure due to concurrency issue since Xcode 16 Beta 5 · Issue #1491 · yonaskolb/XcodeGen
The current main can't build with Xcode 16 Beta 5.
Because,
UnsafeMutableBudderPointeris not a thread-safe, so we can't pass it toSendableclosure even if compiled in Swift 5 mode.This PR resolves this issue.
This change may cause the performance, but I have no idea how much not using
ContiguousArraywill affect performance