kotlin.coroutines.jvm.internal.RunSuspend.kt Maven / Gradle / Ivy

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Kotlin Standard Library for JVM

There is a newer version: 2.1.0-Beta1

/*
 * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package kotlin.coroutines.jvm.internal

import kotlin.coroutines.Continuation
import kotlin.coroutines.CoroutineContext
import kotlin.coroutines.EmptyCoroutineContext
import kotlin.coroutines.startCoroutine

/**
 * Wrapper for `suspend fun main` and `@Test suspend fun testXXX` functions.
 */
@SinceKotlin("1.3")
internal fun runSuspend(block: suspend () -> Unit) {
    val run = RunSuspend()
    block.startCoroutine(run)
    run.await()
}

private class RunSuspend : Continuation {
    override val context: CoroutineContext
        get() = EmptyCoroutineContext

    var result: Result? = null

    override fun resumeWith(result: Result) = synchronized(this) {
        this.result = result
        @Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN") (this as Object).notifyAll()
    }

    fun await() = synchronized(this) {
        while (true) {
            when (val result = this.result) {
                null -> @Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN") (this as Object).wait()
                else -> {
                    result.getOrThrow() // throw up failure
                    return
                }
            }
        }
    }
}