exception lock_error while intensive locking/unlocking of mutex

[sergey.stepanov@…]

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.