mirror of
https://github.com/apple/container.git
synced 2026-09-09 17:25:36 +00:00
Danny Canter
6bc4bf5124
This change adds documentation to quite a few existing public types that didn't have a blurb before. Additionally, this fixes a couple things that I think either didn't make sense when going to document them: - Rename ConnectionStream to VsockConnectionStream. This type only functions for vsock connections. - Deletes NsLock+Closure. This was not used anywhere. - Rename ContainerizationOCI/Config.swift to ImageConfig.swift. Signed-off-by: Danny Canter <danny_canter@apple.com>
55 lines
1.9 KiB
Swift
55 lines
1.9 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025 Apple Inc. and the containerization project authors. All rights reserved.
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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 Foundation
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/// `AsyncLock` provides a familiar locking API, with the main benefit being that it
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/// is safe to call async methods while holding the lock. This is primarily used in spots
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/// where an actor makes sense, but we may need to ensure we don't fall victim to actor
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/// reentrancy issues.
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public actor AsyncLock {
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private var busy = false
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private var queue: ArraySlice<CheckedContinuation<(), Never>> = []
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public struct Context: Sendable {
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fileprivate init() {}
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}
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public init() {}
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public func withLock<T: Sendable>(_ body: @Sendable @escaping (Context) async throws -> T) async rethrows -> T {
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while self.busy {
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await withCheckedContinuation { cc in
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self.queue.append(cc)
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}
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}
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self.busy = true
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defer {
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self.busy = false
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if let next = self.queue.popFirst() {
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next.resume(returning: ())
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} else {
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self.queue = []
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}
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}
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let context = Context()
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return try await body(context)
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}
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}
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