mirror of
https://github.com/apple/container.git
synced 2026-09-12 02:35:42 +00:00
47 lines
1.8 KiB
Swift
47 lines
1.8 KiB
Swift
//===----------------------------------------------------------------------===//
|
|
// Copyright © 2025 Apple Inc. and the Containerization project authors. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// https://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// `Synchronization` will be automatically imported with `SendableProperty`.
|
|
@_exported import Synchronization
|
|
|
|
// A declaration of the `@SendableProperty` macro.
|
|
@attached(peer, names: arbitrary)
|
|
@attached(accessor)
|
|
public macro SendableProperty() = #externalMacro(module: "SendablePropertyMacros", type: "SendablePropertyMacro")
|
|
|
|
/// A synchronization primitive that protects shared mutable state via mutual exclusion.
|
|
public final class Synchronized<T>: Sendable {
|
|
private let lock: Mutex<State>
|
|
|
|
private struct State: @unchecked Sendable {
|
|
var value: T
|
|
}
|
|
|
|
/// Creates a new instance.
|
|
/// - Parameter value: The initial value.
|
|
public init(_ value: T) {
|
|
self.lock = Mutex(State(value: value))
|
|
}
|
|
|
|
/// Calls the given closure after acquiring the lock and returns its value.
|
|
/// - Parameter body: The body of code to execute while the lock is held.
|
|
public func withLock<R>(_ body: (inout T) throws -> R) rethrows -> R {
|
|
try lock.withLock { state in
|
|
try body(&state.value)
|
|
}
|
|
}
|
|
}
|