The send() function in Channel is suspending. The reasoning behind this is that you may want to pause the code that is sending elements until there is someone actually listening for the data. This concept is often referred to as backpressure, and helps to prevent your channels from being flooded with more elements than the receivers can actually process.

In order to configure this backpressure, you can define a buffer for your channel. The coroutine sending data through the channel will be suspended when the elements in the channel have reached the size of the buffer. Once elements are removed from the channel, the sender will be resumed.