libstdc++-v3/config/cpu/sh/atomicity.h

   1 // Low-level functions for atomic operations: sh version  -*- C++ -*-
   2
   3 // Copyright (C) 1999-2019 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 // Use the default atomicity stuff, which will use __atomic* builtins
  26 // if threads are available, or the *_single functions on single-thread
  27 // configurations.
  28 // Actually we wouldn't need this header at all, but because of PR 53579
  29 // libstdc++'s configury will not pickup the -matomic-model= option when
  30 // set in the environment.  This makes it impossible to enable the proper
  31 // atomic model on SH without modifying GCC itself, because libstdc++ always
  32 // thinks the target doesn't do any atomics and uses the default mutex based
  33 // implementation from cpu/generic/atomicity_mutex.
  34
  35 #include <ext/atomicity.h>