14fee23f9Smrg // Implementation file for the -*- C++ -*- dynamic memory management header.
24fee23f9Smrg
3*b1e83836Smrg // Copyright (C) 1996-2022 Free Software Foundation, Inc.
44fee23f9Smrg //
54fee23f9Smrg // This file is part of GCC.
64fee23f9Smrg //
74fee23f9Smrg // GCC is free software; you can redistribute it and/or modify
84fee23f9Smrg // it under the terms of the GNU General Public License as published by
94fee23f9Smrg // the Free Software Foundation; either version 3, or (at your option)
104fee23f9Smrg // any later version.
114fee23f9Smrg //
124fee23f9Smrg // GCC is distributed in the hope that it will be useful,
134fee23f9Smrg // but WITHOUT ANY WARRANTY; without even the implied warranty of
144fee23f9Smrg // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
154fee23f9Smrg // GNU General Public License for more details.
164fee23f9Smrg //
174fee23f9Smrg // Under Section 7 of GPL version 3, you are granted additional
184fee23f9Smrg // permissions described in the GCC Runtime Library Exception, version
194fee23f9Smrg // 3.1, as published by the Free Software Foundation.
204fee23f9Smrg
214fee23f9Smrg // You should have received a copy of the GNU General Public License and
224fee23f9Smrg // a copy of the GCC Runtime Library Exception along with this program;
234fee23f9Smrg // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
244fee23f9Smrg // <http://www.gnu.org/licenses/>.
254fee23f9Smrg
264fee23f9Smrg #include "new"
274d5abbe8Smrg #include <bits/atomic_lockfree_defines.h>
284d5abbe8Smrg
294d5abbe8Smrg #if ATOMIC_POINTER_LOCK_FREE < 2
304d5abbe8Smrg #include <ext/concurrence.h>
314d5abbe8Smrg namespace
324d5abbe8Smrg {
334d5abbe8Smrg __gnu_cxx::__mutex mx;
344d5abbe8Smrg }
354d5abbe8Smrg #endif
364fee23f9Smrg
37f9a78e0eSmrg const std::nothrow_t std::nothrow = std::nothrow_t{ };
384fee23f9Smrg
394fee23f9Smrg using std::new_handler;
404d5abbe8Smrg namespace
414d5abbe8Smrg {
424fee23f9Smrg new_handler __new_handler;
434d5abbe8Smrg }
444fee23f9Smrg
454fee23f9Smrg new_handler
set_new_handler(new_handler handler)464fee23f9Smrg std::set_new_handler (new_handler handler) throw()
474fee23f9Smrg {
484d5abbe8Smrg new_handler prev_handler;
494d5abbe8Smrg #if ATOMIC_POINTER_LOCK_FREE > 1
504d5abbe8Smrg __atomic_exchange (&__new_handler, &handler, &prev_handler,
514d5abbe8Smrg __ATOMIC_ACQ_REL);
524d5abbe8Smrg #else
534d5abbe8Smrg __gnu_cxx::__scoped_lock l(mx);
544d5abbe8Smrg prev_handler = __new_handler;
554fee23f9Smrg __new_handler = handler;
564d5abbe8Smrg #endif
574fee23f9Smrg return prev_handler;
584fee23f9Smrg }
594d5abbe8Smrg
604d5abbe8Smrg new_handler
get_new_handler()614d5abbe8Smrg std::get_new_handler () noexcept
624d5abbe8Smrg {
634d5abbe8Smrg new_handler handler;
644d5abbe8Smrg #if ATOMIC_POINTER_LOCK_FREE > 1
654d5abbe8Smrg __atomic_load (&__new_handler, &handler, __ATOMIC_ACQUIRE);
664d5abbe8Smrg #else
674d5abbe8Smrg __gnu_cxx::__scoped_lock l(mx);
684d5abbe8Smrg handler = __new_handler;
694d5abbe8Smrg #endif
704d5abbe8Smrg return handler;
714d5abbe8Smrg }
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