mirror of
https://github.com/autc04/Retro68.git
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65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
// Copyright (C) 2009-2014 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 <future>
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#include <thread>
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#include <testsuite_performance.h>
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inline bool is_ready(std::shared_future<void>& f)
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{
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return f.wait_for(std::chrono::microseconds(1)) == std::future_status::ready;
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}
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void poll(std::shared_future<void> f)
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{
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while (!is_ready(f))
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{ }
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}
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int main()
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{
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#ifdef TEST_T1
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#define thread_type true
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#endif
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using namespace __gnu_test;
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time_counter time;
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resource_counter resource;
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const int n = 20;
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std::promise<void> p;
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std::shared_future<void> f = p.get_future();
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std::thread pollers[n];
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for (int i=0; i < n; ++i)
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pollers[i] = std::thread(poll, f);
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start_counters(time, resource);
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for (int i = 0; i < 1000000; ++i)
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(void)is_ready(f);
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p.set_value();
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for (int i=0; i < n; ++i)
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pollers[i].join();
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stop_counters(time, resource);
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report_performance(__FILE__, "", time, resource);
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return 0;
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}
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