void reader(rw_data &d){
int x;
for(int i=0;i < 10; ++i){
this_thread::sleep(posix_time::milliseconds(5));
d.read(&x);
mutex::scoped_lock lock(io_mu);
cout <<"#" << this_thread::get_id() << ", reader:" << x << endl;
}
}
void reader(rw_data& d)
{
using namespace boost;
int x;
for(int i = 0; i < 10; i++)
{
this_thread::sleep(posix_time::millisec(5));
d.read(&x);
mutex::scoped_lock lock(io_mutex);
cout << "reader: " << x << endl;
}
}