synchronized

kotlin-stdlib / kotlin / synchronized
Platform and version requirements: 
inline fun <R> synchronized(lock: Any, block: () -> R): R
Deprecated: Synchronization on any object is not supported on every platform and will be removed from the common standard library soon.
Platform and version requirements: JVM (1.0), JS (1.1) 
inline fun <R> synchronized(lock: Any, block: () -> R): R

Executes the given function block while holding the monitor of the given object lock.

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/synchronized.html