ActualJvm.jvm.kt
/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.compose.runtime
import androidx.compose.runtime.internal.ThreadMap
import androidx.compose.runtime.internal.emptyThreadMap
import androidx.compose.runtime.snapshots.Snapshot
import androidx.compose.runtime.snapshots.SnapshotContextElement
import kotlin.coroutines.CoroutineContext
import kotlinx.coroutines.ThreadContextElement
internal actual typealias AtomicReference<V> = java.util.concurrent.atomic.AtomicReference<V>
internal actual open class ThreadLocal<T> actual constructor(
private val initialValue: () -> T
) : java.lang.ThreadLocal<T>() {
@Suppress("UNCHECKED_CAST")
actual override fun get(): T {
return super.get() as T
}
actual override fun set(value: T) {
super.set(value)
}
override fun initialValue(): T? {
return initialValue.invoke()
}
actual override fun remove() {
super.remove()
}
}
internal actual class SnapshotThreadLocal<T> {
private val map = AtomicReference<ThreadMap>(emptyThreadMap)
private val writeMutex = Any()
@Suppress("UNCHECKED_CAST")
actual fun get(): T? = map.get().get(Thread.currentThread().id) as T?
actual fun set(value: T?) {
val key = Thread.currentThread().id
synchronized(writeMutex) {
val current = map.get()
if (current.trySet(key, value)) return
map.set(current.newWith(key, value))
}
}
}
internal actual fun identityHashCode(instance: Any?): Int = System.identityHashCode(instance)
@PublishedApi
internal actual inline fun <R> synchronized(lock: Any, block: () -> R): R {
return kotlin.synchronized(lock, block)
}
internal actual typealias TestOnly = org.jetbrains.annotations.TestOnly
internal actual fun invokeComposable(composer: Composer, composable: @Composable () -> Unit) {
@Suppress("UNCHECKED_CAST")
val realFn = composable as Function2<Composer, Int, Unit>
realFn(composer, 1)
}
internal actual fun <T> invokeComposableForResult(
composer: Composer,
composable: @Composable () -> T
): T {
@Suppress("UNCHECKED_CAST")
val realFn = composable as Function2<Composer, Int, T>
return realFn(composer, 1)
}
internal actual class AtomicInt actual constructor(value: Int) {
val delegate = java.util.concurrent.atomic.AtomicInteger(value)
actual fun get(): Int = delegate.get()
actual fun set(value: Int) = delegate.set(value)
actual fun add(amount: Int): Int = delegate.addAndGet(amount)
}
internal actual fun ensureMutable(it: Any) { /* NOTHING */ }
/**
* Implementation of [SnapshotContextElement] that enters a single given snapshot when updating
* the thread context of a resumed coroutine.
*/
@ExperimentalComposeApi
internal actual class SnapshotContextElementImpl actual constructor(
private val snapshot: Snapshot
) : SnapshotContextElement, ThreadContextElement<Snapshot?> {
override val key: CoroutineContext.Key<*>
get() = SnapshotContextElement
override fun updateThreadContext(context: CoroutineContext): Snapshot? =
snapshot.unsafeEnter()
override fun restoreThreadContext(context: CoroutineContext, oldState: Snapshot?) {
snapshot.unsafeLeave(oldState)
}
}