thread/test/test_once.cpp

#include <boost/thread/once.hpp>
#include <boost/thread/thread.hpp>

#include <boost/test/unit_test.hpp>

namespace
{
	int once_value = 0;
	boost::once_flag once = BOOST_ONCE_INIT;

	void init_once_value()
	{
		once_value++;
	}

	void test_once_thread()
	{
		boost::call_once(&init_once_value, once);
	}
}

void test_once()
{
	const int NUMTHREADS=5;
	boost::thread_group threads;
	for (int i=0; i<NUMTHREADS; ++i)
		threads.create_thread(&test_once_thread);
	threads.join_all();
	BOOST_CHECK_EQUAL(once_value, 1);
}

boost::unit_test_framework::test_suite* once_tests()
{
	boost::unit_test_framework::test_suite* test = BOOST_TEST_SUITE("Boost.Threads: once test suite");

	test->add(BOOST_TEST_CASE(&test_once));

	return test;
}