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03d8ea5248
This is a tool specifically designed to generate Xcode projects for the Swift repo (as well as a couple of adjacent repos such as LLVM and Clang). It aims to provide a much more user-friendly experience than the CMake Xcode generation (`build-script --xcode`).
44 lines
1.1 KiB
Swift
44 lines
1.1 KiB
Swift
//===--- Lock.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) 2024 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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import os
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final class Lock: @unchecked Sendable {
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private let lockPtr: UnsafeMutablePointer<os_unfair_lock>
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init() {
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self.lockPtr = UnsafeMutablePointer<os_unfair_lock>.allocate(capacity: 1)
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self.lockPtr.initialize(to: os_unfair_lock())
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}
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func lock() {
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os_unfair_lock_lock(self.lockPtr)
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}
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func unlock() {
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os_unfair_lock_unlock(self.lockPtr)
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}
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@inline(__always)
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func withLock<R>(_ body: () throws -> R) rethrows -> R {
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lock()
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defer {
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unlock()
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}
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return try body()
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}
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deinit {
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self.lockPtr.deinitialize(count: 1)
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self.lockPtr.deallocate()
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}
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}
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