Learning Concurrency in Kotlin

On channel open and not full

If the channel is open and it's not full, offer() will add the element to the queue. This is the only way to add elements to a channel without it happening from a suspending computation:

val channel = Channel<Int>(1)channel.offer(2) // truechannel.receive() // 2

The send() implementation in AbstractSendChannel tries to add the element to the queue using offer() first; that way, the sender will not suspend if it's not needed.