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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Atomics open source project
//
// Copyright (c) 2021 - 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
//
//===----------------------------------------------------------------------===//
extension RawRepresentable
where
Self: AtomicOptionalWrappable,
RawValue: AtomicOptionalWrappable,
RawValue.AtomicOptionalRepresentation.Value == RawValue?
{
public typealias AtomicOptionalRepresentation =
AtomicOptionalRawRepresentableStorage<Self>
}
/// A default atomic storage representation for a `RawRepresentable` type
/// whose `RawValue` conforms to `AtomicOptionalWrappable`.
@frozen
public struct AtomicOptionalRawRepresentableStorage<Wrapped>: AtomicStorage
where
Wrapped: RawRepresentable,
Wrapped.RawValue: AtomicOptionalWrappable,
Wrapped.RawValue.AtomicOptionalRepresentation.Value == Wrapped.RawValue?
{
public typealias Value = Optional<Wrapped>
@usableFromInline
internal typealias _Storage = Wrapped.RawValue.AtomicOptionalRepresentation
@usableFromInline
internal var _storage: _Storage
@_transparent @_alwaysEmitIntoClient
public init(_ value: __owned Optional<Wrapped>) {
self._storage = _Storage(value?.rawValue)
}
@_transparent @_alwaysEmitIntoClient
__consuming public func dispose() -> Optional<Wrapped> {
_storage.dispose().flatMap(Wrapped.init(rawValue:))
}
@usableFromInline
@_transparent @_alwaysEmitIntoClient
static func _extract(
_ ptr: UnsafeMutablePointer<Self>
) -> UnsafeMutablePointer<_Storage> {
// `Self` is layout-compatible with its only stored property.
return UnsafeMutableRawPointer(ptr).assumingMemoryBound(to: _Storage.self)
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicLoad(
at pointer: UnsafeMutablePointer<Self>,
ordering: AtomicLoadOrdering
) -> Optional<Wrapped> {
let ro = _Storage.atomicLoad(
at: _extract(pointer), ordering: ordering)
return ro.flatMap(Wrapped.init(rawValue:))
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicStore(
_ desired: __owned Optional<Wrapped>,
at pointer: UnsafeMutablePointer<Self>,
ordering: AtomicStoreOrdering
) {
_Storage.atomicStore(
desired?.rawValue, at: _extract(pointer), ordering: ordering)
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicExchange(
_ desired: __owned Optional<Wrapped>,
at pointer: UnsafeMutablePointer<Self>,
ordering: AtomicUpdateOrdering
) -> Optional<Wrapped> {
let ro = _Storage.atomicExchange(
desired?.rawValue, at: _extract(pointer), ordering: ordering)
return ro.flatMap(Wrapped.init(rawValue:))
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicCompareExchange(
expected: Optional<Wrapped>,
desired: __owned Optional<Wrapped>,
at pointer: UnsafeMutablePointer<Self>,
ordering: AtomicUpdateOrdering
) -> (exchanged: Bool, original: Optional<Wrapped>) {
let ro = _Storage.atomicCompareExchange(
expected: expected?.rawValue,
desired: desired?.rawValue,
at: _extract(pointer),
ordering: ordering)
return (ro.exchanged, ro.original.flatMap(Wrapped.init(rawValue:)))
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicCompareExchange(
expected: Optional<Wrapped>,
desired: __owned Optional<Wrapped>,
at pointer: UnsafeMutablePointer<Self>,
successOrdering: AtomicUpdateOrdering,
failureOrdering: AtomicLoadOrdering
) -> (exchanged: Bool, original: Optional<Wrapped>) {
let ro = _Storage.atomicCompareExchange(
expected: expected?.rawValue,
desired: desired?.rawValue,
at: _extract(pointer),
successOrdering: successOrdering,
failureOrdering: failureOrdering)
return (ro.exchanged, ro.original.flatMap(Wrapped.init(rawValue:)))
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicWeakCompareExchange(
expected: Optional<Wrapped>,
desired: __owned Optional<Wrapped>,
at pointer: UnsafeMutablePointer<Self>,
successOrdering: AtomicUpdateOrdering,
failureOrdering: AtomicLoadOrdering
) -> (exchanged: Bool, original: Optional<Wrapped>) {
let ro = _Storage.atomicWeakCompareExchange(
expected: expected?.rawValue,
desired: desired?.rawValue,
at: _extract(pointer),
successOrdering: successOrdering,
failureOrdering: failureOrdering)
return (ro.exchanged, ro.original.flatMap(Wrapped.init(rawValue:)))
}
}
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