libstdc++-v3/testsuite/20_util/shared_ptr/atomic/3.cc

   1 // { dg-do run }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-gthreads "" }
   5
   6 // Copyright (C) 2014-2022 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #include <thread>
  24 #include <memory>
  25 #include <testsuite_hooks.h>
  26
  27 struct leaddock
  28 {
  29   ~leaddock();
  30 };
  31
  32 std::shared_ptr<leaddock> global;
  33
  34 leaddock::~leaddock()
  35 {
  36   // If this destructor is called "inside" an atomic operation on global it
  37   // will deadlock, so this checks that the atomic_store is done atomically.
  38   auto copy = std::atomic_load(&global);
  39   VERIFY( !copy );
  40 }
  41
  42 void f()
  43 {
  44   std::atomic_store(&global, std::make_shared<leaddock>());
  45   std::atomic_store(&global, {});
  46 }
  47
  48 int main()
  49 {
  50   std::thread{ f }.join();
  51 }