#include <boost/thread.hpp>
#include <assert.h>
#include <iostream>
#include <stdlib.h>
#include <unistd.h>

boost::mutex mtx;
boost::condition_variable cv;

int main()
{
    while(1) {
	for (int i=0; i<3; ++i) {
		const time_t wait_time = ::time(0)+1;

		boost::mutex::scoped_lock lk(mtx);
		const bool res = cv.timed_wait(lk, boost::posix_time::from_time_t(wait_time));
		const time_t end_time = ::time(0);
		assert(end_time >= wait_time);
		std::cerr << "OK\n";
	}
	const long s = random() % 100000;
	std::cerr << "switch, sleep " << s << " ms\n";
	usleep(s);
    }
}