On Fri, Aug 11, 2017 at 04:31:44PM +0200, Mark Kettenis wrote: > The diff below implements __cxa_thread_atexit(). Calls to this > function are emitted by the compiler to schedule running desctructors > for thread_local objects when a thread terminates or calls exit(3). > The Linux implementation prevents unloading of shared libraries that > registered such destructors to prevent things from crashing. This > diff does not implement that functionality yet. I plan to add that > later. I expect this to be a bit of a corner case.
Well, if you don't care that much about the corner case, you can directly use the generic fallback implementation in libc++abi. Preventing unloading is the least stupid of all options, the rest basically break one major promise or another. > I've chosen to implement __cxa_thread_atexit() directly instead of > __cxa_thread_atexit_impl(). I think that is cleaner. It means we > don't need to make changes to libc++ for this to start working. It > looks like modern libstdc++ version will detect __cxa_thread_atexit(). Which version did you look at? All cases I have seen check exclusively for *_impl(). That's why I settled down on making it the official interface in NetBSD and providing the more natural __cxa_thread_atexit only as weak alias. Joerg
