Add TaskExecutor conformance to EventLoops #2732
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fabianfett
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Lukasa
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May 29, 2024
| // MARK: TaskExecutor conformance | ||
| #if compiler(>=6.0) | ||
| @available(macOS 9999.0, iOS 9999.0, watchOS 9999.0, tvOS 9999.0, *) | ||
| extension SelectableEventLoop: NIOTaskEventLoopExecutor { } |
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Can you also add conformance for AsyncTestingEventLoop and a fatalErroring conformance for EmbeddedEventLoop?
fabianfett
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May 29, 2024
| let loop1 = iterator.next()! | ||
| let loop2 = iterator.next()! | ||
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| await self._runTests(loop1: loop1, loop2: loop2) |
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this test currently crashes:
Thread 4 Crashed:: NIO-ELT-0-#0
0 libswiftCore.dylib 0x19a319644 swift_getObjectType + 88
1 libswift_Concurrency.dylib 0x2617ea0e4 swift_task_enqueueImpl(swift::Job*, swift::SerialExecutorRef) + 160
2 libswift_Concurrency.dylib 0x2617ec890 swift::AsyncTask::flagAsAndEnqueueOnExecutor(swift::SerialExecutorRef) + 432
3 libswift_Concurrency.dylib 0x2617eacdc swift_task_switchImpl(swift::AsyncContext*, void (swift::AsyncContext* swift_async_context) swiftasynccall*, swift::SerialExecutorRef) + 640
4 swift-nioPackageTests 0x1080d5ca1 partial apply for closure #1 in closure #1 in TaskExecutorTests._runTests<A, B>(loop1:loop2:) + 1
5 swift-nioPackageTests 0x1080d4d3d thunk for @escaping @isolated(any) @callee_guaranteed @Sendable @async () -> (@out A) + 1
6 swift-nioPackageTests 0x1080d4e99 partial apply for thunk for @escaping @isolated(any) @callee_guaranteed @Sendable @async () -> (@out A) + 1
7 libswift_Concurrency.dylib 0x2617f1921 completeTaskWithClosure(swift::AsyncContext*, swift::SwiftError*) + 1
Why do we call swift_task_switchImpl with a SerialExecutorRef?
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switch is what checks if it can "switch" without releasing actor locks; it won't be able to switch when there's a task executor. I'll look into reproducing this though with a debug runtime to check.
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Can we also add another benchmark for the |
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Performance results on my machine: |
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Add TaskExecutor conformance to EventLoops
Motivation
Swift 6 introduces the option to supply your own task executors to the Swift concurrency runtime (SE-0417). SwiftNIO's EventLoop should conform to the new TaskExecutor protocol to support running Swift concurrency Tasks on it. This will allow fewer context switches in Swift on server applications.
Modifications
SerialExecutor)NIODefaultSerialEventLoopExecutortoNIODefaultEventLoopExecutorNIODefaultEventLoopExecutornow also implementsTaskExecutorprotocolNIOTaskEventLoopExecutorprotocol that makes it easy for adopters to get a better implementationResult
Adopters can use ELs as task executors