60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#include "thread/flag.hpp"
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#include "thread/spinlock.hpp"
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#include "tap.hpp"
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#include <mutex>
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#include <thread>
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///////////////////////////////////////////////////////////////////////////////
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void
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fight (cruft::thread::flag &start, cruft::thread::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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cruft::TAP::logger tap;
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cruft::thread::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 << 12;
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cruft::thread::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_all ();
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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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return tap.status ();
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} |