wehub-resource-sync
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113 lines
3.8 KiB
Swift
113 lines
3.8 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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import Dispatch
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import Synchronization
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#if canImport(Musl)
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import Musl
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#elseif canImport(Glibc)
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import Glibc
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#elseif canImport(Darwin)
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import Darwin
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#endif
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/// Async friendly wrapper around `DispatchSourceSignal`. Provides an `AsyncStream`
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/// interface to get notified of received signals.
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public final class AsyncSignalHandler: Sendable {
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/// An async stream that returns the signal that was caught, if ever.
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public var signals: AsyncStream<Int32> {
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let (stream, cont) = AsyncStream.makeStream(of: Int32.self)
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self.state.withLock {
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$0.conts.append(cont)
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}
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cont.onTermination = { @Sendable _ in
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self.cancel()
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}
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return stream
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}
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/// Cancel every AsyncStream of signals, as well as the underlying
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/// DispatchSignalSource's for each registered signal.
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public func cancel() {
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self.state.withLock {
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if $0.conts.isEmpty {
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return
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}
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for cont in $0.conts {
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cont.finish()
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}
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for source in $0.sources {
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source.cancel()
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}
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$0.conts.removeAll()
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$0.sources.removeAll()
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}
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}
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struct State: Sendable {
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var conts: [AsyncStream<Int32>.Continuation] = []
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// `sources` isn't used concurrently.
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nonisolated(unsafe) var sources: [any DispatchSourceSignal] = []
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}
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// We keep a reference to the continuation object that is created for
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// our AsyncStream and tell our signal handler to yield a value to it
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// returning a value to the consumer
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private func handler(_ sig: Int32) {
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self.state.withLock {
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for cont in $0.conts {
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cont.yield(sig)
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}
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}
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}
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private let state: Mutex<State> = .init(State())
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/// Create a new `AsyncSignalHandler` that catches all signals.
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public static func catchAll() -> AsyncSignalHandler {
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#if os(macOS)
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let range = 1...31
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#else
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let range = 1...64
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#endif
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return create(notify: range.map { Int32($0) })
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}
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/// Create a new `AsyncSignalHandler` for the list of given signals `notify`.
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/// The default signal handlers for these signals are removed and async handlers
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/// added in their place. The async signal handlers that are installed simply
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/// yield to a stream if and when a signal is caught.
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public static func create(notify on: [Int32]) -> AsyncSignalHandler {
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let out = AsyncSignalHandler()
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var sources = [any DispatchSourceSignal]()
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for sig in on {
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signal(sig, SIG_IGN)
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let source = DispatchSource.makeSignalSource(signal: sig)
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source.setEventHandler {
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out.handler(sig)
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}
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source.resume()
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// Retain a reference to our signal sources so that they
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// do not go out of scope.
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sources.append(source)
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}
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out.state.withLock { $0.sources = sources }
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return out
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}
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}
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