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Make MPSCAsyncChannel #isolation methods use nonisolated(nonsending)`. #384

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Make MPSCAsyncChannel #isolation methods use nonisolated(nonsending)`. #384

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4 changes: 2 additions & 2 deletions ...MultiProducerSingleConsumerChannel/MultiProducerSingleConsumerAsyncChannel+Internal.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -391,7 +391,7 @@ extension MultiProducerSingleConsumerAsyncChannel {
}

@inlinable
func next(isolation: isolated (any Actor)? = #isolation) async throws -> Element? {
nonisolated(nonsending) func next() async throws -> Element? {
let action = self._stateMachine.withLock {
$0.next()
}
Expand Down Expand Up @@ -431,7 +431,7 @@ extension MultiProducerSingleConsumerAsyncChannel {
}

@inlinable
func suspendNext(isolation: isolated (any Actor)? = #isolation) async throws -> Element? {
nonisolated(nonsending) func suspendNext() async throws -> Element? {
try await withTaskCancellationHandler {
try await withUnsafeThrowingContinuation { (continuation: UnsafeContinuation<Element?, Error>) in
let action = self._stateMachine.withLock {
Expand Down
8 changes: 2 additions & 6 deletions ...gorithms/MultiProducerSingleConsumerChannel/MultiProducerSingleConsumerAsyncChannel.swift
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Expand Up @@ -201,9 +201,7 @@ public struct MultiProducerSingleConsumerAsyncChannel<Element, Failure: Error>:
/// - Parameter isolation: The callers isolation.
/// - Returns: The next buffered element.
@inlinable
public mutating func next(
isolation: isolated (any Actor)? = #isolation
) async throws(Failure) -> Element? {
nonisolated(nonsending) public mutating func next() async throws(Failure) -> Element? {
do {
return try await self.storage.next()
} catch {
Expand Down Expand Up @@ -710,9 +708,7 @@ extension MultiProducerSingleConsumerAsyncChannel.ChannelAsyncSequence where Ele
}

@inlinable
mutating func next(
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@FranzBusch FranzBusch Dec 9, 2025

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I don't think we can change this one since this is a protocol requirement of AsyncSequence unless nonisolated(nonsending) methods are capable of fulfilling isolated protocol requirement

isolation actor: isolated (any Actor)? = #isolation
) async throws(Failure) -> Element? {
nonisolated(nonsending) mutating func next() async throws(Failure) -> Element? {
do {
return try await self._backing.storage.next(isolation: actor)
} catch {
Expand Down
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