use two conditions during the thread creation phase to make sure that it is *really* impossible to signal the condition and get our own signal the line after. The pthread lib under linux works just fine on such a borderline case, but it may not be the case of any thread implementation. Namly, our xbt_thread implem for windows is not that permissive. It could be possible to make our implem more robust, but it is ways easier to make our user code less demanding
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@3287
48e7efb5-ca39-0410-a469-
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