id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7720	exception lock_error while intensive locking/unlocking of mutex	sergey.stepanov@…	viboes	"Hi, Anthony and Vicente. 


{{{
////////////////////////////////////////////
#include <boost/thread/thread.hpp>
using namespace boost;

shared_mutex mtx;

void f()
{
    while (true)
    {
        upgrade_lock<shared_mutex> lock(mtx);
    }
}

void g()
{
    while (true)
    {
        shared_lock<shared_mutex> lock(mtx);
    }
}

void h()
{
    while (true)
    {
        unique_lock<shared_mutex> lock(mtx);
    }
}

int main()
{
    thread t0(f);
    thread t1(g);
    thread t2(h);

    t0.join();
    t1.join();
    t2.join();

    return 0;
}
////////////////////////////////////////////
}}}


I ran this program and got exception boost::lock_error in some minutes.

Used MS VS 2005 Version 8.0.50727.867, Boost C++ Libraries 1.51 and MS Windows 7 Pro version 6.1.7601 SP1. 

Regards, Sergey.
"	Bugs	closed	Boost 1.60.0	thread	Boost 1.51.0	Regression	fixed	lock_error