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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Builtin
/// An atomic value.
@available(SwiftStdlib 6.0, *)
@frozen
@_rawLayout(like: Value.AtomicRepresentation)
@_staticExclusiveOnly
public struct Atomic<Value: AtomicRepresentable>: ~Copyable {
@available(SwiftStdlib 6.0, *)
@_alwaysEmitIntoClient
@_transparent
var _address: UnsafeMutablePointer<Value.AtomicRepresentation> {
UnsafeMutablePointer<Value.AtomicRepresentation>(_rawAddress)
}
@available(SwiftStdlib 6.0, *)
@_alwaysEmitIntoClient
@_transparent
var _rawAddress: Builtin.RawPointer {
Builtin.unprotectedAddressOfBorrow(self)
}
/// Initializes a value of this atomic with the given initial value.
///
/// - Parameter initialValue: The initial value to set this atomic.
@available(SwiftStdlib 6.0, *)
@_alwaysEmitIntoClient
@_transparent
public init(_ initialValue: consuming Value) {
_address.initialize(to: Value.encodeAtomicRepresentation(initialValue))
}
// Deinit's can't be marked @_transparent. Do these things need all of these
// attributes..?
@available(SwiftStdlib 6.0, *)
@_alwaysEmitIntoClient
@inlinable
deinit {
let oldValue = Value.decodeAtomicRepresentation(_address.pointee)
_ = consume oldValue
_address.deinitialize(count: 1)
}
}
@available(SwiftStdlib 6.0, *)
extension Atomic: @unchecked Sendable where Value: Sendable {}
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