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//===--- Lock.swift -----------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2024 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
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import os
final class Lock: @unchecked Sendable {
private let lockPtr: UnsafeMutablePointer<os_unfair_lock>
init() {
self.lockPtr = UnsafeMutablePointer<os_unfair_lock>.allocate(capacity: 1)
self.lockPtr.initialize(to: os_unfair_lock())
}
func lock() {
os_unfair_lock_lock(self.lockPtr)
}
func unlock() {
os_unfair_lock_unlock(self.lockPtr)
}
@inline(__always)
func withLock<R>(_ body: () throws -> R) rethrows -> R {
lock()
defer {
unlock()
}
return try body()
}
deinit {
self.lockPtr.deinitialize(count: 1)
self.lockPtr.deallocate()
}
}
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