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57 lines
1.9 KiB
Swift
57 lines
1.9 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#if canImport(Synchronization) && FOUNDATION_FRAMEWORK
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internal import Synchronization
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#endif
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/// Keeps a global generation count for updated Locale information, including locale, time zone, and calendar preferences.
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/// If any of those preferences change, then `count` will update to a new value. Compare that to a cached value to see if your cached `Locale.current`, `TimeZone.current`, or `Calendar.current` to see if it is out of date.
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/// If any cached values need to be recalculated process-wide, call `reset`.
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struct LocaleNotifications : Sendable, ~Copyable {
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static let cache = LocaleNotifications()
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#if canImport(Synchronization) && FOUNDATION_FRAMEWORK
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let _count = Atomic<Int>(1)
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#else
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let _count = LockedState<Int>(initialState: 1)
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#endif
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func count() -> Int {
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#if canImport(Synchronization) && FOUNDATION_FRAMEWORK
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_count.load(ordering: .relaxed)
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#else
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_count.withLock { $0 }
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#endif
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}
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/// Make a new generation current, but no associated Locale.
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func reset() {
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LocaleCache.cache.reset()
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CalendarCache.cache.reset()
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_ = TimeZoneCache.cache.reset()
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#if canImport(Synchronization) && FOUNDATION_FRAMEWORK
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_count.add(1, ordering: .relaxed)
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#else
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_count.withLock { $0 += 1 }
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#endif
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}
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}
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#if FOUNDATION_FRAMEWORK
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@_cdecl("_localeNotificationCount")
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func _localeNotificationCount() -> Int {
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LocaleNotifications.cache.count()
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}
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#endif
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