56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
// { dg-do run }
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// { dg-options "-pthread" }
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// { dg-require-effective-target c++11 }
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// { dg-require-effective-target pthread }
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// { dg-require-gthreads "" }
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// Copyright (C) 2009-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <mutex>
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#include <thread>
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#include <testsuite_hooks.h>
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std::once_flag flag;
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int value = 0;
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struct Inc { void operator()() const { ++value; } };
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struct Func
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{
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void operator()() const
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{
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Inc inc;
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for (int i = 0; i < 10000; ++i)
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std::call_once(flag, inc);
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}
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};
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int main()
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{
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Func f;
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std::thread t1(f);
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std::thread t2(f);
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std::thread t3(f);
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t1.join();
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t2.join();
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t3.join();
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VERIFY( value == 1 );
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return 0;
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}
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