Computer scienceProgramming languagesKotlinConcurrency and parallelismParallelismSynchronization

Executors

Supplying a task

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Suppose you have an instance of ExecutorService.

val executor: ExecutorService = Executors.newSingleThreadExecutor()

The main thread supplies two tasks to it:

val task: Runnable = Runnable {
    try {
        TimeUnit.MILLISECONDS.sleep(1000)
        println("Hello!")
    } catch (e: Exception) {
        println(e.stackTraceToString())
    }
}

executor.submit(task)
executor.submit(task)

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This code will not work if we create an executor with four threads in the pool instead of the given executor

This executor does not stop after completing both tasks

The main thread will not wait for the completion of the submitted tasks

This executor can perform both tasks in parallel

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