On Nov 11, 2008, at 6:54 PM, Charles Oliver Nutter wrote:

> * require must only initiate loading once
> * we can't guarantee loading has completed without risking deadlocks
> * callers of require expect loading to be completed by the time it  
> returns
>
> Then:
>
> * it is impossible to provide all basic require guarantees to  
> multiple threads requiring the same file at the same time

It would seem that many of the global $ variables would need  
protecting from concurrent access from multiple threads. So, wouldn't  
it solve the problem simply to have a mutex (or set of mutexes) to  
controll access to these, and then claim the mutex associated with $"  
while doing the require?


Dave