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1 // Implementation file for the -*- C++ -*- dynamic memory management header.
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2
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145
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3 // Copyright (C) 1996-2020 Free Software Foundation, Inc.
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111
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4 //
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5 // This file is part of GCC.
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6 //
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7 // GCC is free software; you can redistribute it and/or modify
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8 // it under the terms of the GNU General Public License as published by
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9 // the Free Software Foundation; either version 3, or (at your option)
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10 // any later version.
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11 //
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12 // GCC is distributed in the hope that it will be useful,
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13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 // GNU General Public License for more details.
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16 //
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17 // Under Section 7 of GPL version 3, you are granted additional
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18 // permissions described in the GCC Runtime Library Exception, version
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19 // 3.1, as published by the Free Software Foundation.
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20
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21 // You should have received a copy of the GNU General Public License and
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22 // a copy of the GCC Runtime Library Exception along with this program;
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23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 // <http://www.gnu.org/licenses/>.
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25
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26 #include "new"
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27 #include <bits/atomic_lockfree_defines.h>
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28
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29 #if ATOMIC_POINTER_LOCK_FREE < 2
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30 #include <ext/concurrence.h>
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31 namespace
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32 {
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33 __gnu_cxx::__mutex mx;
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34 }
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35 #endif
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36
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37 const std::nothrow_t std::nothrow = std::nothrow_t{ };
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38
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39 using std::new_handler;
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40 namespace
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41 {
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42 new_handler __new_handler;
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43 }
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44
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45 new_handler
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46 std::set_new_handler (new_handler handler) throw()
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47 {
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48 new_handler prev_handler;
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49 #if ATOMIC_POINTER_LOCK_FREE > 1
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50 __atomic_exchange (&__new_handler, &handler, &prev_handler,
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51 __ATOMIC_ACQ_REL);
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52 #else
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53 __gnu_cxx::__scoped_lock l(mx);
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54 prev_handler = __new_handler;
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55 __new_handler = handler;
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56 #endif
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57 return prev_handler;
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58 }
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59
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60 new_handler
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61 std::get_new_handler () noexcept
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62 {
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63 new_handler handler;
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64 #if ATOMIC_POINTER_LOCK_FREE > 1
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65 __atomic_load (&__new_handler, &handler, __ATOMIC_ACQUIRE);
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66 #else
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67 __gnu_cxx::__scoped_lock l(mx);
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68 handler = __new_handler;
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69 #endif
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70 return handler;
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71 }
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