Re: [patch] C++11: Observers for the three 'handler functions'

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

This should fix the handlers for platforms without __atomic_exchange
for pointers by using a mutex. I used the old __mutex type not
std::mutex because it's available on more platforms and works for the
'single' thread model too.  I didn't try to optimise away the atomic
ops for accessing the handlers because throwing exceptions and
getting/setting these handlers should not be on the fast path of
performance sensitive code.

        PR libstdc++/56841
        * libsupc++/eh_ptr.cc (rethrow_exception): Use get_unexpected() and
        get_terminate() accessors.
        * libsupc++/eh_throw.cc (__cxa_throw): Likewise.
        * libsupc++/eh_terminate.cc: Use mutex when atomic builtins not
        available.
        * libsupc++/new_handler.cc: Likewise.

Tested x86_64-linux and hppa2.0-linux, committed to trunk.

Attachment: patch.txt
Description: Text document