[Boost-users] [Thread] Strange problem.

4 Apr 2011

      Hello. I'm designing a class with a locking policy. I have some code
that does exaclty this:

		if (cond) {
			locking_policy_.lock();
			out << message.message();
			locking_policy_.unlock();
		}
		return *this;

And the lockingpolicy is a class like this one:

struct ThreadSafe {
	boost::mutex io_mutex_;
	boost::unique_lockboost::mutex lock_;

	ThreadSafe() : io_mutex_(), lock_(io_mutex_, boost::defer_lock) {}

	void lock() {
		std::cout << "Locking from " << boost::this_thread::get_id() << std::endl;
		lock_.lock();
	}

	void unlock() {
		std::cout << "Unlocking from " << boost::this_thread::get_id() << std::endl;
		lock_.unlock();
	}
};

Then, I create 3 threads and join them in the same order I created them:

boost::thread t1(&doSomething, "Hello1", boost::ref(logsink));
boost::thread t2(&doSomething, "Hello2", boost::ref(logsink));
boost::thread t3(&doSomehting, "Hello3", boost::ref(logsink));

	t1.join();
	t2.join();
	t3.join();

and I get a lock_error. Any help here, please? I can't figure out the problem.

[Boost-users] [Thread] Strange problem.

Germán Diago