SysCall97 SysCall97

Hello, I am Mashry from Bangladesh.I am a computer science student.I love mathematics.

SysCall97 / DispatchSemaphore.swift

Last active April 9, 2024 07:24

	import Foundation

	// Create a custom concurrent queue
	let concurrentQueue = DispatchQueue(label: "com.example.concurrentQueue", attributes:.concurrent)

	var sharedArray: [Int] = []


	let numberOfThreadsAllowedToAccessSharedReource: Int = 1
	// Semaphore to control access the shared resource

SysCall97 / DispatchBarrierFlag.swift

Created April 9, 2024 06:45

	import Foundation

	// Create a custom concurrent queue
	let concurrentQueue = DispatchQueue(label: "com.example.concurrentQueue", attributes:.concurrent)

	var sharedArray: [Int] = []

	// Function to write to the shared array in a thread-safe manner using barrier
	func writeToArray(element: Int) {
	concurrentQueue.async(flags: .barrier) {

SysCall97 / DispatchWorkItem.swift

Last active April 9, 2024 06:46

	import Foundation

	class Search {
	private var suggestedCitiesWorkItem: DispatchWorkItem?

	func getSuggestedCities(for prefix: String) {
	// here cancelling the previous workitem before assigning the new one
	suggestedCitiesWorkItem?.cancel()

	let workItem: DispatchWorkItem = DispatchWorkItem {

SysCall97 / DispatchGroup-enter-leave-wait.swift

Last active April 9, 2024 06:46

	import UIKit

	class SplashViewController: UIViewController {
	var launchDataDispatchGroup: DispatchGroup = DispatchGroup()
	override func viewDidLoad() {
	super.viewDidLoad()

	DispatchQueue.global().async { [weak self] in
	self?.getAppLaunchData()
	}

SysCall97 / DispatchGroup-enter-leave-notify.swift

Created April 9, 2024 04:39

	import UIKit

	class SplashViewController: UIViewController {
	var launchDataDispatchGroup: DispatchGroup = DispatchGroup()
	override func viewDidLoad() {
	super.viewDidLoad()

	DispatchQueue.global().async { [weak self] in
	self?.getAppLaunchData()
	}

SysCall97 / QoS.swift

Created April 8, 2024 16:21

	import Foundation

	// Perform loop 1 to 10 on global concurrent queue with 'userInteractive' QoS
	DispatchQueue.global(qos: .userInteractive).async {
	for i in 1...10 {
	print("Queue 1: \(i)")
	}
	}

	// Perform loop 11 to 20 on global concurrent queue with 'userInitiated' QoS

SysCall97 / UILabelExtension.swift

Created April 8, 2024 15:58

	import UIKit

	extension UILabel {
	func updateLabel(with newText: String) {
	DispatchQueue.main.async {
	// Update the text of the label on the main thread
	self.text = newText
	}
	}
	}

SysCall97 / ParentWithCallback.tsx

Created June 16, 2021 11:49

	const Parent = () => {
	const [count, setCount] = useState<number>(0);

	const printFunction = useCallback((text: string) => {
	console.log(text);
	}, []);

	// some other functions

	return (

SysCall97 / Child.tsx

Last active June 16, 2021 11:03

	type props = {
	callback: (a: string) => void;
	}

	const Child: React.FC<props> = ({callback}) => {
	const [value, setVlaue] = useState<number>(0);

	const isEven = () => {
	let i = 0;
	// this while loop is to mock a costly operation

SysCall97 / Parent.tsx

Last active June 16, 2021 10:50

	const Parent = () => {
	const [count, setCount] = useState<number>(0);

	const printFunction = (text: string) => {
	console.log(text);
	}

	// some other functions

	return (