fun <E> SendChannel<E>.sendBlocking(element: E): Unit
Platform and version requirements: JVM
Adds element into to this channel, blocking the caller while this channel Channel.isFull,
or throws exception if the channel Channel.isClosedForSend (see Channel.close for details).
This is a way to call Channel.send method inside a blocking code using runBlocking,
so this function should not be used from coroutine.