https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846
--- Comment #8 from dave.anglin at bell dot net --- On 2018-08-11 8:04 PM, redi at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846 > > --- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- > This should do it: The testsuite isn't quite finished but it's clear this fixes the bug on hppa64-hp-hpux11.11. Don't know about second patch. > > --- a/libstdc++-v3/src/c++17/memory_resource.cc > +++ b/libstdc++-v3/src/c++17/memory_resource.cc > @@ -25,6 +25,7 @@ > #include <memory_resource> > #include <atomic> > #include <new> > +#include <bits/std_mutex.h> > > namespace std _GLIBCXX_VISIBILITY(default) > { > @@ -81,7 +82,31 @@ namespace pmr > > constant_init<newdel_res_t> newdel_res{}; > constant_init<null_res_t> null_res{}; > +#if ATOMIC_POINTER_LOCK_FREE == 2 > constant_init<atomic<memory_resource*>> default_res{&newdel_res.obj}; > +#else > + struct locking_atomic > + { > + constexpr locking_atomic(memory_resource* r) : val(r) { } > + mutex mx; > + memory_resource* val; > + > + memory_resource* load() > + { > + lock_guard<mutex> lock(mx); > + return val; > + } > + > + memory_resource* exchange(memory_resource* r) > + { > + lock_guard<mutex> lock(mx); > + auto prev = val; > + val = r; > + return prev; > + } > + }; > + constant_init<locking_atomic> default_res{&newdel_res.obj}; > +#endif > } // namespace > > memory_resource* > Thanks, Dave
