How to Kill a Coroutine in Kotlin in 2024?

To kill a coroutine in Kotlin, you can use the cancel() function on the coroutine instance. This will immediately stop the execution of the coroutine and release any allocated resources. You can also use a job to manage the coroutine's lifecycle and cancel it using the cancel() function on the job instance. It is important to handle any exceptions or cleanup tasks before canceling the coroutine to avoid any unexpected behavior.

How to cancel a coroutine in Kotlin?

In Kotlin, you can cancel a coroutine by calling the cancel function on the Job object that was returned when the coroutine was launched. Here's an example of how to cancel a coroutine:

import kotlinx.coroutines.*

fun main() {
    val job = GlobalScope.launch {
        repeat(1000) { i ->
            println("Coroutine is running: $i")
            delay(100L) // simulate some work being done
        }
    }
    
    // Cancel the coroutine after 500 milliseconds
    delay(500L)
    job.cancel()
    
    println("Coroutine cancelled")
    
    // Make sure to wait for the coroutine to finish
    runBlocking {
        job.join()
    }
}

In this example, a coroutine is launched using GlobalScope.launch and is cancelled after 500 milliseconds using the cancel function on the Job object returned by GlobalScope.launch. The runBlocking function is used to wait for the coroutine to finish after cancelling it.

How to stop a coroutine execution in Kotlin?

There are several ways to stop a coroutine execution in Kotlin:

Using a cancellation token: You can use a cancellation token to explicitly cancel a coroutine. To do this, you can call the cancel function on the coroutine's job object.

val job = GlobalScope.launch {
    // Coroutine code here
}

// Cancelling the coroutine
job.cancel()

Using a timeout: You can use a timeout to automatically cancel a coroutine after a certain period of time. To do this, you can use the withTimeout function.

GlobalScope.launch {
    withTimeout(5000) {
        // Coroutine code here
    }
}

Using structured concurrency: Another option is to use structured concurrency, where you launch child coroutines within a coroutine scope. By cancelling the outer coroutine scope, you can cancel all child coroutines as well.

val job = GlobalScope.launch {
    coroutineScope {
        // Child coroutines here
    }
}

// Cancelling the outer coroutine scope will cancel all child coroutines
job.cancel()

Using cooperative cancellation: You can check for cancellation status within your coroutine using the isActive property, and manually stop the coroutine if needed.

val job = GlobalScope.launch {
    while (isActive) {
        // Coroutine code here
    }
}

These are some ways you can stop a coroutine execution in Kotlin. Choose the method that best fits your use case and requirements.

How to terminate a coroutine in Kotlin?

To terminate a coroutine in Kotlin, you can use the cancel function provided by the Job interface. Here's an example of how you can terminate a coroutine:

import kotlinx.coroutines.*

fun main() {
    val job = GlobalScope.launch {
        repeat(10) {
            println("Coroutine is running")
            delay(1000)
        }
    }

    // Cancel the coroutine after 5 seconds
    GlobalScope.launch {
        delay(5000)
        job.cancel()
    }

    // Wait for the coroutine to finish
    runBlocking {
        job.join()
        println("Coroutine has been terminated")
    }
}

In this example, we create a coroutine that runs for 10 iterations printing "Coroutine is running" message every second. We then create a new coroutine that waits for 5 seconds before canceling the first coroutine using job.cancel(). The runBlocking block ensures that the main thread waits for the coroutine to finish or be canceled before exiting.

When the first coroutine is canceled, it will throw a CancellationException and the join() function will wait for the coroutine to finish before printing "Coroutine has been terminated". This is how you can terminate a coroutine in Kotlin using the cancel function.

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How to Kill a Coroutine in Kotlin?

How to cancel a coroutine in Kotlin?

How to stop a coroutine execution in Kotlin?

How to terminate a coroutine in Kotlin?

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