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46 lines
1.8 KiB
Swift
46 lines
1.8 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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// `Foundation` will be automatically imported with `SendableProperty`.
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@_exported import Foundation
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// A declaration of the `@SendableProperty` macro.
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@attached(peer, names: arbitrary)
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@attached(accessor)
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public macro SendableProperty() = #externalMacro(module: "SendablePropertyMacros", type: "SendablePropertyMacro")
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/// A synchronization primitive that protects shared mutable state via mutual exclusion.
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public final class Synchronized<T>: @unchecked Sendable {
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private let lock = NSLock()
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private var value: T
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/// Creates a new instance.
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/// - Parameter value: The initial value.
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public init(_ value: T) {
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self.value = value
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}
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/// Calls the given closure after acquiring the lock and returns its value.
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/// - Parameter body: The body of code to execute while the lock is held.
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public func withLock<R>(_ body: (inout T) throws -> R) rethrows -> R {
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lock.lock()
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defer {
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lock.unlock()
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}
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return try body(&value)
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}
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}
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