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Make ArticleStatus properly Sendable (rather than unchecked Sendable) via proper use of OSAllocatedUnfairLock.

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This commit is contained in:
Brent Simmons 2024-05-01 19:36:38 -07:00
parent 2f422b5141
commit 625983c74e
1 changed files with 14 additions and 38 deletions
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52
Articles/Sources/Articles/ArticleStatus.swift
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@ -11,11 +11,11 @@ import os
/// Read and starred status for an Article.
///
/// These are uniqued — there is never more than one instance per articleID.
/// These are uniqued — there is never more than one instance per articleID per account.
///
/// Its two Bool properties, `read` and `starred`, are both protected
/// by an internal lock, which makes `ArticleStatus` thread-safe.
public final class ArticleStatus: Hashable, @unchecked Sendable {
/// Its two mutable Bool properties, `read` and `starred`, are each protected
/// by an OSAllocatedUnfairLock, which makes `ArticleStatus` Sendable.
public final class ArticleStatus: Hashable, Sendable {
public enum Key: String, Sendable {
case read = "read"
@ -25,56 +25,32 @@ public final class ArticleStatus: Hashable, @unchecked Sendable {
public let articleID: String
public let dateArrived: Date
// Sharing one lock for all instances is preferred to having one (or two)
// locks per instance — that could means thousands of locks in memory.
private static let lock = OSAllocatedUnfairLock()
private let _read: OSAllocatedUnfairLock<Bool>
private let _starred: OSAllocatedUnfairLock<Bool>
public var read: Bool {
get {
Self.lock.lock()
defer {
Self.lock.unlock()
}
return _read
_read.withLock { $0 }
}
set {
Self.lock.lock()
defer {
Self.lock.unlock()
}
_read = newValue
_read.withLock { $0 = newValue }
}
}
public var starred: Bool {
get {
Self.lock.lock()
defer {
Self.lock.unlock()
}
return _starred
_starred.withLock { $0 }
}
set {
Self.lock.lock()
defer {
Self.lock.unlock()
}
_starred = newValue
_starred.withLock { $0 = newValue }
}
}
private var _read = false
private var _starred = false
public init(articleID: String, read: Bool, starred: Bool, dateArrived: Date) {
self.articleID = articleID
self.dateArrived = dateArrived
self._read = read
self._starred = starred
self._read = OSAllocatedUnfairLock(initialState: read)
self._starred = OSAllocatedUnfairLock(initialState: starred)
}
public convenience init(articleID: String, read: Bool, dateArrived: Date) {
@ -95,9 +71,9 @@ public final class ArticleStatus: Hashable, @unchecked Sendable {
switch key {
case .read:
_read = status
read = status
case .starred:
_starred = status
starred = status
}
}