Working on COLLADA support

Some time ago start working on COLLADA format support.

Spurious wakeup

There are some freaky things in multithreads programming. One of the is so called "Spurious wakeup".
So, seemly valid code:

void wait_for_data() {

boost::mutex::scoped_lock lock(the_mutex);
if(the_queue.empty()) {
the_condition_variable.wait(lock); }
}

need to be corrected:

void wait_for_data()
{
boost::mutex::scoped_lock lock(the_mutex);
while(the_queue.empty()) {

the_condition_variable.wait(lock); }}

links:

http://en.wikipedia.org/wiki/Spurious_wakeup
http://www.justsoftwaresolutions.co.uk/threading/implementing-a-thread-safe-queue-using-condition-variables.html