sigsegv_register and async-safety

[Marc Nieper-Wißkirchen]

Hi,

when a sigsegv handler is installed that uses sigsegv_dispatch, how
can we achieve async-safety in multithreaded programs?

One thread may want to register a new area handler while a
segmentation fault is currently handled.

I may be able to think of some complicated ways to solve this problem,
but maybe there is a simple one.

Marc