65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#include "job/flag.hpp"
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#include "job/spinlock.hpp"
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#include "tap.hpp"
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#include <thread>
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#include <mutex>
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///////////////////////////////////////////////////////////////////////////////
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void
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fight (util::job::flag &start, util::job::spinlock &l, int iterations)
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{
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start.wait ();
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for (int count = 0; count < iterations; ++count)
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std::lock_guard g (l);
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};
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//-----------------------------------------------------------------------------
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int
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main ()
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{
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util::TAP::logger tap;
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util::job::spinlock l;
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l.lock ();
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tap.expect (true, "locked without contention");
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l.unlock ();
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tap.expect (true, "unlocked without contention");
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if (std::thread::hardware_concurrency () < 2) {
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tap.skip ("n-way fight");
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} else {
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constexpr int iterations = 1 << 16;
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util::job::flag start_flag;
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std::vector<std::thread> contestants;
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for (unsigned i = 0; i < std::thread::hardware_concurrency (); ++i)
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contestants.emplace_back (fight, std::ref (start_flag), std::ref (l), iterations);
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start_flag.notify ();
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for (auto &t: contestants)
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t.join ();
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tap.expect (true, "n-way fight, %! contestants", std::thread::hardware_concurrency ());
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}
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} |