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[Config] Prefer NSLock over objc_sync_enter for synchronizing value types #14041

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Nov 6, 2024
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[Config] Prefer NSLock over objc_sync_enter for synchronizing value types #14041

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15 changes: 8 additions & 7 deletions FirebaseRemoteConfig/SwiftNew/UserDefaultsManager.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,7 @@ public class UserDefaultsManager: NSObject {
}
}

private static let sharedInstanceMapLock = NSLock()
private static var sharedInstanceMap: [String: UserDefaults] = [:]

/// Returns the shared user defaults instance for the given bundle identifier.
Expand All @@ -81,14 +82,14 @@ public class UserDefaultsManager: NSObject {
/// - Returns: The shared user defaults instance.
@objc(sharedUserDefaultsForBundleIdentifier:)
static func sharedUserDefaultsForBundleIdentifier(_ bundleIdentifier: String) -> UserDefaults {
objc_sync_enter(sharedInstanceMap)
defer { objc_sync_exit(sharedInstanceMap) }
if let instance = sharedInstanceMap[bundleIdentifier] {
return instance
sharedInstanceMapLock.withLock {
if let instance = sharedInstanceMap[bundleIdentifier] {
return instance
}
let userDefaults = UserDefaults(suiteName: userDefaultsSuiteName(for: bundleIdentifier))!
sharedInstanceMap[bundleIdentifier] = userDefaults
return userDefaults
}
let userDefaults = UserDefaults(suiteName: userDefaultsSuiteName(for: bundleIdentifier))!
sharedInstanceMap[bundleIdentifier] = userDefaults
return userDefaults
}

/// Returns the user defaults suite name for the given bundle identifier.
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