Interface BaseReadableChannel<T>

Reads a value from the channel. If there are no values, blocks until there is

If channel is buffered, takes next value from the buffer. This unblocks first of blocked WritableChannel.write calls if there are any

If channel is unbuffered, simply unblocks the first of blocked WritableChannel.write

If the channel is closed and has no values left in the buffer, returns undefined

Concurrent calls are allowed - each read will get own value (no two reads will get the same value). If multiple calls are blocked, they will unblock one-by-one in unspecified order

Note: each blocked call occupies memory, and there is no limit on how many calls there can be at once. Typically, programs have a fixed or a finite number of reads, so this should not be a problem