On Mon, Dec 23, 2002 at 01:37:18PM -0500, Dan Sugalski wrote: > At 1:50 PM +0000 12/22/02, Leopold Toetsch (via RT) wrote: > >Here is another approach, to finally unify the marking routines: > >- next_for_GC remains what it is > >- instead of current_end_of_list and a return value, mark_used() uuses > > a file static mark_ptr. As we don't have recursive DOD runs, this > > ought to be safe. > > Nope. Threads. Two interpreters can be DODing at the same time. > Static variables aren't tenable for much of anything with threads... > :(
Unless protected by a mutex. I have now read the programming POSIX threads book. I take it that makes me a fully qualified l33t threads d00d who knows everything. How much of a speed impact could it be to serialise DOD runs between threads? Presumably 1 thread doing a DOD run could actually manage to free up enough memory to make both happy? Nicholas Clark
