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