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From: Eric Wong <>
Subject: [ruby-core:86655] cross-thread IO#close semantics
Date: Mon, 23 Apr 2018 13:39:46 +0000
Message-ID: <20180423133946.GA6019@dcvr> (raw)

Related to the discussion on [Bug #14681]

I found an old Ruby 1.8 installation, and the following code
exits after 100ms with: [IOError, "stream closed"]
1.9 and later hangs forever:

  r, w = IO.pipe
  th = do
    rescue => e
      warn [ e.class, e.message ].inspect
  sleep 0.1

Of course I know why: it's not implemented in 1.9+;
rb_thread_io_blocking_region only cares for operations on the
single FD case, multiplexing functions like select aren't
supported.  I could implement it, but it has overhead and maybe
nobody cares for this feature. is an inefficient API

This also pertains to [Feature #13618] for auto-fiber/green thread
support or whatever it will be called.

If I replace with single FD operation which hits
rb_thread_io_blocking_region in 1.9+ such as "", then Ruby
behaves consistently in 1.8/1.9/2.x

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-23 13:39 Eric Wong [this message]
2018-05-15  9:53 ` [ruby-core:87040] " Eric Wong

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