为什么并发红宝石立即退出

Question

我正在尝试使用并发红宝石来执行一些并行任务，我正在遵循文档并使用Concurrent::Async：

require 'concurrent'
class Echo
include Concurrent::Async
def echo(msg)
p msg
end
end
horn = Echo.new
horn.async.echo('one')

并在终端中运行它，但进程什么都不打印，并立即退出

Answer 1

require 'concurrent'
class Echo
include Concurrent::Async
def echo(msg)
p msg
end
end
horn = Echo.new
# t is an instance of Concurrent::IVar which includes Concurrent::Concern::Obligation
t = horn.async.echo('one')
# wait until obligation is complete or the timeout has been reached
t.wait! 

资源代码