[Boost-users] boost::recursive_mutex doesn't lock ???

2 Nov 2010

      Hello.

I have a question about mutexes:

Scenario 1: (OK)

	int main()
	{
		boost::mutex		io_mutex;
		io_mutex.lock();

		// thread will be blocked now
		boost::mutex::scoped_lock lock(io_mutex);
		cout << "Test"		// this statement is not executed: OK
	}

So far no problem, but if I use recursive_mutex instead...

Scenario 2: (NOT OK)

	int main()
	{
		boost::recursive_mutex	io_mutex;
		io_mutex.lock();

		// thread will NOT be blocked   ???
		boost::recursive_mutex::scoped_lock lock(io_mutex);
		cout << "Test"		// this statement is executed  ???
	}

no blocking occurs??
I tried with unique_lock instead of scoped_lock but still no blocking
Why not? I don't understand.

How does one lock a recursive_mutex then?

thank you
Chris