Sources/SPTDataLoaderSwift/Utilities/AccessLock.swift

// Copyright 2015-2023 Spotify AB
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import Foundation

final class AccessLock {
    private let lock: os_unfair_lock_t

    init() {
        lock = .allocate(capacity: 1)
        lock.initialize(to: os_unfair_lock())
    }

    deinit {
        lock.deinitialize(count: 1)
        lock.deallocate()
    }

    @discardableResult
    func sync<Result>(closure: () throws -> Result) rethrows -> Result {
        os_unfair_lock_lock(lock)
        defer { os_unfair_lock_unlock(lock) }

        return try closure()
    }
}