steipete/SpinlockTestTests.swift

## SpinlockTestTests.swift
//
//  SpinlockTestTests.swift
//  SpinlockTestTests
//
//  Created by Peter Steinberger on 04/10/2016.
//  Copyright © 2016 PSPDFKit GmbH. All rights reserved.
//

import XCTest

final class LockingTests: XCTestCase {

    func testSpinLock() {
        var spinLock = OS_SPINLOCK_INIT
        executeLockTest { (block) in
            OSSpinLockLock(&spinLock)
            block()
            OSSpinLockUnlock(&spinLock)
        }
    }

    func testUnfairLock() {
        var unfairLock = os_unfair_lock_s()
        executeLockTest { (block) in
            os_unfair_lock_lock(&unfairLock)
            block()
            os_unfair_lock_unlock(&unfairLock)
        }
    }

    func testDispatchSemaphore() {
        let sem = DispatchSemaphore(value: 1)
        executeLockTest { (block) in
            _ = sem.wait(timeout: DispatchTime.distantFuture)
            block()
            sem.signal()
        }
    }

    func testNSLock() {
        let lock = NSLock()
        executeLockTest { (block) in
            lock.lock()
            block()
            lock.unlock()
        }
    }

    func testPthreadMutex() {
        var mutex = pthread_mutex_t()
        pthread_mutex_init(&mutex, nil)
        executeLockTest{ (block) in
            pthread_mutex_lock(&mutex)
            block()
            pthread_mutex_unlock(&mutex)
        }
        pthread_mutex_destroy(&mutex);
    }

    func testSyncronized() {
        let obj = NSObject()
        executeLockTest{ (block) in
            objc_sync_enter(obj)
            block()
            objc_sync_exit(obj)
        }
    }

    func testQueue() {
        let lockQueue = DispatchQueue.init(label: "com.test.LockQueue")
        executeLockTest{ (block) in
            lockQueue.sync() {
                block()
            }
        }
    }

    func disabled_testNoLock() {
        executeLockTest { (block) in
            block()
        }
    }
    private func executeLockTest(performBlock:@escaping (_ block:() -> Void) -> Void) {
        let dispatchBlockCount = 16
        let iterationCountPerBlock = 100_000
        // This is an example of a performance test case.
        let queues = [
            DispatchQueue.global(qos: DispatchQoS.QoSClass.userInteractive),
            DispatchQueue.global(qos: DispatchQoS.QoSClass.default),
            DispatchQueue.global(qos: DispatchQoS.QoSClass.utility),
            ]
        var value = 0
        self.measure {
            let group = DispatchGroup.init()
            for block in 0..<dispatchBlockCount {
                group.enter()
                let queue = queues[block % queues.count]
                queue.async(execute: {
                    for _ in 0..<iterationCountPerBlock {
                        performBlock({
                            value = value + 2
                            value = value - 1
                        })
                    }
                    group.leave()
                })
            }
            _ = group.wait(timeout: DispatchTime.distantFuture)
        }
    }
}
	//
	// SpinlockTestTests.swift
	// SpinlockTestTests
	//
	// Created by Peter Steinberger on 04/10/2016.
	// Copyright © 2016 PSPDFKit GmbH. All rights reserved.
	//

	import XCTest

	final class LockingTests: XCTestCase {

	func testSpinLock() {
	var spinLock = OS_SPINLOCK_INIT
	executeLockTest { (block) in
	OSSpinLockLock(&spinLock)
	block()
	OSSpinLockUnlock(&spinLock)
	}
	}

	func testUnfairLock() {
	var unfairLock = os_unfair_lock_s()
	executeLockTest { (block) in
	os_unfair_lock_lock(&unfairLock)
	block()
	os_unfair_lock_unlock(&unfairLock)
	}
	}

	func testDispatchSemaphore() {
	let sem = DispatchSemaphore(value: 1)
	executeLockTest { (block) in
	_ = sem.wait(timeout: DispatchTime.distantFuture)
	block()
	sem.signal()
	}
	}

	func testNSLock() {
	let lock = NSLock()
	executeLockTest { (block) in
	lock.lock()
	block()
	lock.unlock()
	}
	}

	func testPthreadMutex() {
	var mutex = pthread_mutex_t()
	pthread_mutex_init(&mutex, nil)
	executeLockTest{ (block) in
	pthread_mutex_lock(&mutex)
	block()
	pthread_mutex_unlock(&mutex)
	}
	pthread_mutex_destroy(&mutex);
	}

	func testSyncronized() {
	let obj = NSObject()
	executeLockTest{ (block) in
	objc_sync_enter(obj)
	block()
	objc_sync_exit(obj)
	}
	}

	func testQueue() {
	let lockQueue = DispatchQueue.init(label: "com.test.LockQueue")
	executeLockTest{ (block) in
	lockQueue.sync() {
	block()
	}
	}
	}

	func disabled_testNoLock() {
	executeLockTest { (block) in
	block()
	}
	}
	private func executeLockTest(performBlock:@escaping (_ block:() -> Void) -> Void) {
	let dispatchBlockCount = 16
	let iterationCountPerBlock = 100_000
	// This is an example of a performance test case.
	let queues = [
	DispatchQueue.global(qos: DispatchQoS.QoSClass.userInteractive),
	DispatchQueue.global(qos: DispatchQoS.QoSClass.default),
	DispatchQueue.global(qos: DispatchQoS.QoSClass.utility),
	]
	var value = 0
	self.measure {
	let group = DispatchGroup.init()
	for block in 0..<dispatchBlockCount {
	group.enter()
	let queue = queues[block % queues.count]
	queue.async(execute: {
	for _ in 0..<iterationCountPerBlock {
	performBlock({
	value = value + 2
	value = value - 1
	})
	}
	group.leave()
	})
	}
	_ = group.wait(timeout: DispatchTime.distantFuture)
	}
	}
	}