在jRuby中使用"fork"生成进程的替代方法? [英] Alternative for spawning a process with 'fork' in jRuby?

问题描述

在MRI Ruby中，我可以这样做:

In MRI Ruby I can do this:

def transfer
  internal_server = self.init_server
  pid = fork do
    internal_server.run
  end

  # Make the server process run independently.
  Process.detach(pid)

  internal_client = self.init_client
  # Do other stuff with connecting to internal_server...
  internal_client.post('some data')    
ensure
  # Kill server
  Process.kill('KILL', pid) if pid
end

但是上述代码无法在jRuby中运行，因为它不支持'fork'方法:

However the above code will not run in jRuby, because it does not support 'fork' method:

NotImplementedError: fork is not available on this platform

jRuby中是否有其他解决方案?

Is there any alternative solution for this in jRuby?

谢谢.

推荐答案

我找到了解决方案.我们可以使用JRuby中的内置库FFI在MRI中模拟" Process.fork.

I found out the solution for this. We can use the built-in library FFI in JRuby to 'simulate' the Process.fork in MRI.

# To mimic the Process.fork in MRI Ruby
module JRubyProcess
  require 'ffi'
  extend FFI::Library
  ffi_lib FFI::Library::LIBC
  attach_function :fork, [], :int
end

pid = JRubyProcess.fork do
  #internal_server.run
end

更多详细信息:

https://github.com/ffi/ffi

http://blog.headius.com/2008/10/ffi-for-ruby-now-available.html

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