Tusker/TuskerTests/TuskerTests.swift

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//
// TuskerTests.swift
// TuskerTests
//
// Created by Shadowfacts on 8/15/18.
// Copyright © 2018 Shadowfacts. All rights reserved.
//
import XCTest
@testable import Tusker
class TuskerTests: XCTestCase {
override func setUp() {
// Put setup code here. This method is called before the invocation of each test method in the class.
}
override func tearDown() {
// Put teardown code here. This method is called after the invocation of each test method in the class.
}
func testExample() {
// This is an example of a functional test case.
// Use XCTAssert and related functions to verify your tests produce the correct results.
}
func testPerformanceExample() {
// This is an example of a performance test case.
self.measure {
// Put the code you want to measure the time of here.
}
}
func testFuckingLock() {
let lock = MutexLock<[Int: Bool]>(initialState: [:])
for i in 0..<100 {
Thread.detachNewThread {
for j in 0..<50_000 {
lock.withLock {
$0[i * 50_000 + j] = true
}
}
}
}
while true {
if lock.withLock({ $0.count }) == 5_000_000 {
break
}
}
lock.withLock({ _ in
print("WHAT THE FUUUUUUUUUUUUCK")
})
}
}
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fileprivate class MutexLock<State> {
private var state: State
private var lock = NSLock()
init(initialState: State) {
self.state = initialState
}
func withLock<R>(_ body: @Sendable (inout State) throws -> R) rethrows -> R where R : Sendable {
if !lock.lock(before: Date(timeIntervalSinceNow: 1)) {
// if we can't acquire the lock after 1 second, something has gone catastrophically wrong
fatalError()
}
defer { lock.unlock() }
return try body(&state)
}
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}