From: "Iñaki Baz Castillo" <ibc@...>
Date: 2012-04-17T19:15:45+09:00
Subject: GVL lock and unlock

Hi, I'm coding a Ruby wrapper for libuv (the event-driven library used
in node.js). At some point I cann "uv_run()" which is blocking and
start the reactor loop, so I need to unlock the GVL:


VALUE MyLib_loop_start(VALUE self) {
  # Allow other Ruby threads to run.
  # TODO: unlock_GVL function ???

  uv_run(uv_default_loop());

  # At some point (when there is no more events to watch)
  # uv_run terminates, so I need to take the GVL again.
  # TODO: lock_GVL function ???

  return self;
}


So how should I fill the above GVL functions?
I use Ruby 1.9.3. I expected that GVL_UNLOCK_BEGIN/END [*] could work
but they are not defined in any .h file but in thread.c.

Any tip please? Thanks a lot.


BTW: During the libuv event loop, Ruby callbacks will be called.
Should I take the GVL before invoking them?


[*] http://rxr.whitequark.org/mri/source/thread.c?v=1.9.3#106

-- 
Iñaki Baz Castillo
<ibc@aliax.net>