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

Subject: [Boost-users] boost::recursive_mutex doesn't lock ???
From: Chris (cmrchs_at_[hidden])
Date: 2010-11-02 15:33:00

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