commonMain.kotlin.concurrent.Volatile.kt Maven / Gradle / Ivy
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Kotlin Standard Library for JVM
/*
* Copyright 2010-2022 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.concurrent
import kotlin.internal.RequireKotlin
import kotlin.internal.RequireKotlinVersionKind
/**
* Marks the backing field of the annotated `var` property as `volatile`, meaning that reads and writes to this field
* are atomic and writes are always made visible to other threads. If another thread reads the value of this field (e.g. through its accessor),
* it sees not only that value, but all side effects that led to writing that value.
*
* This annotation has effect in Kotlin/JVM and Kotlin/Native.
*
* Note that only _backing field_ operations are atomic when the field is annotated with `Volatile`.
* For example, if the property getter or setter make several operations with the backing field,
* a _property_ operation, i.e. reading or setting it through these accessors, is not guaranteed to be atomic.
*/
@Target(AnnotationTarget.FIELD)
@Retention(AnnotationRetention.SOURCE)
@MustBeDocumented
@OptionalExpectation
@SinceKotlin("1.9")
@RequireKotlin(version = "1.8.20", versionKind = RequireKotlinVersionKind.COMPILER_VERSION)
public expect annotation class Volatile()