kotlin-stdlib / kotlin / synchronized synchronized JVM 1.0 inline fun <R> synchronized(lock: Any, block: () -> R): R(source) JS 1.1 @DeprecatedSinceKotlin("1.6", "1.9") inline fun <R> synchronized( lock: Any, block: () -> R): R(source) Deprecated: Synchronization on any object is not supported in Kotlin/JS Executes the given function block while holding the monitor of the given object lock.