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//===----------------------------------------------------------------------===//
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// The LLVM Compiler Infrastructure
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// Copyright (C) 2011 Vicente J. Botet Escriba
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// <boost/thread/locks.hpp>
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// template <class Mutex> class shared_lock;
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// shared_lock(mutex_type& m, try_to_lock_t);
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#include <boost/thread/lock_types.hpp>
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#include <boost/thread/shared_mutex.hpp>
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#include <boost/thread/thread.hpp>
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#include <boost/detail/lightweight_test.hpp>
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boost::shared_mutex m;
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#if defined BOOST_THREAD_USES_CHRONO
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typedef boost::chrono::system_clock Clock;
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typedef Clock::time_point time_point;
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typedef Clock::duration duration;
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typedef boost::chrono::milliseconds ms;
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typedef boost::chrono::nanoseconds ns;
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#if defined BOOST_THREAD_USES_CHRONO
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time_point t0 = Clock::now();
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boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
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BOOST_TEST(lk.owns_lock() == false);
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boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
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BOOST_TEST(lk.owns_lock() == false);
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boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
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BOOST_TEST(lk.owns_lock() == false);
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boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
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if (lk.owns_lock()) break;
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time_point t1 = Clock::now();
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ns d = t1 - t0 - ms(250);
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// This test is spurious as it depends on the time the thread system switches the threads
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BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
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// time_point t0 = Clock::now();
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// boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
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// BOOST_TEST(lk.owns_lock() == false);
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// boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
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// BOOST_TEST(lk.owns_lock() == false);
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// boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
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// BOOST_TEST(lk.owns_lock() == false);
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boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
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if (lk.owns_lock()) break;
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//time_point t1 = Clock::now();
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//ns d = t1 - t0 - ms(250);
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// This test is spurious as it depends on the time the thread system switches the threads
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//BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
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#if defined BOOST_THREAD_USES_CHRONO
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boost::this_thread::sleep_for(ms(250));
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return boost::report_errors();