[parrot/parrot] 5ee91f: Make embed API invoke work with green threads

[GitHub]

  Branch: refs/heads/gh798_embed_api_green_threads
  Home:   https://github.com/parrot/parrot
  Commit: 5ee91fa6268ffab98a51fe7ad9a15a704d6acb3c
      https://github.com/parrot/parrot/commit/5ee91fa6268ffab98a51fe7ad9a15a704d6acb3c
  Author: Stefan Seifert <nine at detonation.org>
  Date:   2012-07-14 (Sat, 14 Jul 2012)

  Changed paths:
    M config/gen/makefiles/root.in
    M src/embed/pmc.c
    M src/pmc/task.pmc

  Log Message:
  -----------
  Make embed API invoke work with green threads

Task now have an optional signature data attribute which can be passed to
to Parrot_pcc_invoke_from_sig_object directly instead of creating a
signature using Parrot_ext_call.

This is used to have Parrot_api_pmc_invoke create a task and invoke the
scheduler's outer runloop instead of invoking the given sub directly.
This way the green threads infratructure is used correctly and ops like
sleep should work.