reverselock_tests.cpp
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reverselock_tests.cpp
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	// Copyright (c) 2015-2016 The Bitcoin Core developers
	// Distributed under the MIT software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.

	#include "reverselock.h"
	#include "test/test_bitcoin.h"

	#include <boost/test/unit_test.hpp>

	BOOST_FIXTURE_TEST_SUITE(reverselock_tests, BasicTestingSetup)

	BOOST_AUTO_TEST_CASE(reverselock_basics) {
	boost::mutex mutex;
	boost::unique_lock<boost::mutex> lock(mutex);

	BOOST_CHECK(lock.owns_lock());
	{
	reverse_lock<boost::unique_lock<boost::mutex>> rlock(lock);
	BOOST_CHECK(!lock.owns_lock());
	}
	BOOST_CHECK(lock.owns_lock());
	}

	BOOST_AUTO_TEST_CASE(reverselock_errors) {
	boost::mutex mutex;
	boost::unique_lock<boost::mutex> lock(mutex);

	// Make sure trying to reverse lock an unlocked lock fails
	lock.unlock();

	BOOST_CHECK(!lock.owns_lock());

	bool failed = false;
	try {
	reverse_lock<boost::unique_lock<boost::mutex>> rlock(lock);
	} catch (...) {
	failed = true;
	}

	BOOST_CHECK(failed);
	BOOST_CHECK(!lock.owns_lock());

	// Locking the original lock after it has been taken by a reverse lock
	// makes no sense. Ensure that the original lock no longer owns the lock
	// after giving it to a reverse one.

	lock.lock();
	BOOST_CHECK(lock.owns_lock());
	{
	reverse_lock<boost::unique_lock<boost::mutex>> rlock(lock);
	BOOST_CHECK(!lock.owns_lock());
	}

	BOOST_CHECK(failed);
	BOOST_CHECK(lock.owns_lock());
	}

	BOOST_AUTO_TEST_SUITE_END()