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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
//
//===----------------------------------------------------------------------===//
#if canImport(Darwin)
import Darwin
#elseif os(Android)
import Bionic
#elseif canImport(Glibc)
import Glibc
#elseif canImport(Musl)
import Musl
#elseif canImport(WinSDK)
import WinSDK
#elseif canImport(threads_h)
internal import threads_h
#elseif canImport(threads)
internal import threads
#endif
struct _ThreadLocal {
#if canImport(Darwin) || os(Android) || canImport(Glibc) || canImport(Musl)
fileprivate typealias PlatformKey = pthread_key_t
#elseif USE_TSS
fileprivate typealias PlatformKey = tss_t
#elseif canImport(WinSDK)
fileprivate typealias PlatformKey = DWORD
#elseif os(WASI)
fileprivate typealias PlatformKey = UnsafeMutablePointer<UnsafeMutableRawPointer?>
#endif
struct Key<Value> {
fileprivate let key: PlatformKey
init() {
#if canImport(Darwin) || os(Android) || canImport(Glibc) || canImport(Musl)
var key = PlatformKey()
pthread_key_create(&key, nil)
self.key = key
#elseif USE_TSS
var key = PlatformKey()
tss_create(&key, nil)
self.key = key
#elseif canImport(WinSDK)
key = FlsAlloc(nil)
#elseif os(WASI)
key = UnsafeMutablePointer<UnsafeMutableRawPointer?>.allocate(capacity: 1)
#endif
}
}
private static subscript(_ key: PlatformKey) -> UnsafeMutableRawPointer? {
get {
#if canImport(Darwin) || os(Android) || canImport(Glibc) || canImport(Musl)
pthread_getspecific(key)
#elseif USE_TSS
tss_get(key)
#elseif canImport(WinSDK)
FlsGetValue(key)
#elseif os(WASI)
key.pointee
#endif
}
set {
#if canImport(Darwin) || os(Android) || canImport(Glibc) || canImport(Musl)
pthread_setspecific(key, newValue)
#elseif USE_TSS
tss_set(key, newValue)
#elseif canImport(WinSDK)
FlsSetValue(key, newValue)
#elseif os(WASI)
key.pointee = newValue
#endif
}
}
static subscript<Value>(_ key: Key<Value>) -> Value? {
self[key.key]?.load(as: Value.self)
}
static func withValue<Value, R>(_ value: inout Value, for key: Key<Value>, _ block: () throws -> R) rethrows -> R {
precondition(Self[key.key] == nil, "Not allowed to set the value for a key within the subscope of that key")
return try withUnsafeMutablePointer(to: &value) {
Self[key.key] = UnsafeMutableRawPointer($0)
defer { Self[key.key] = nil }
return try block()
}
}
}
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