jvmMain.internal.Concurrent.kt Maven / Gradle / Ivy

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Coroutines support libraries for Kotlin

There is a newer version: 1.9.0

/*
 * Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

package kotlinx.coroutines.internal

import java.lang.reflect.*
import java.util.*
import java.util.concurrent.*

internal actual fun  subscriberList(): SubscribersList = CopyOnWriteArrayList()

internal actual fun  identitySet(expectedSize: Int): MutableSet = Collections.newSetFromMap(IdentityHashMap(expectedSize))

private val REMOVE_FUTURE_ON_CANCEL: Method? = try {
    ScheduledThreadPoolExecutor::class.java.getMethod("setRemoveOnCancelPolicy", Boolean::class.java)
} catch (e: Throwable) {
    null
}

@Suppress("NAME_SHADOWING")
internal fun removeFutureOnCancel(executor: Executor): Boolean {
    try {
        val executor = executor as? ScheduledThreadPoolExecutor ?: return false
        (REMOVE_FUTURE_ON_CANCEL ?: return false).invoke(executor, true)
        return true
    } catch (e: Throwable) {
        return false // failed to setRemoveOnCancelPolicy, assume it does not removes future on cancel
    }
}