hpx::threads::get_self() should throw an exception when called outside of a pxthread

[brycelelbach]

[reported by blelbach] [Trac time Tue Aug 9 21:08:56 2011] get_self() has been one of our biggest causes of segmentation faults. A few weeks ago I modified this function to raise an assertion when called outside of a PX thread, however, this only affects debug modes (assertions are turned off for full release). This function (and possibly the underlying get_self_ptr()) should throw an exception if they are used outside of pxthreads.

[brycelelbach]

[comment by hkaiser] [Trac time Wed Aug 10 13:30:46 2011] get_self_ptr() should not throw nor assert as its purpose is to be able to test whether the thread is executing as a px-thread. If it returns NULL it's executing outside of the HPX thread-manager, non-NULL otherwise.

[brycelelbach]

[comment by blelbach] [Trac time Wed Aug 10 15:22:45 2011] Understood!

[brycelelbach]

[comment by blelbach] [Trac time Thu Aug 11 20:38:45 2011] This was already fixed, r4770