[PATCH][gdbsupport] Use task size in parallel_for_each

[Tom Tromey]

Simon> Just a nit, if we are talking about a centralized work pool that threads
Simon> pick from to get their next work item, that's not really work stealing.
Simon> Work stealing is when threads all have their own work queue, and threads
Simon> with empty queues go steal some work from other threads' queues.

Thanks, that's a clear explanation.

Simon> Given our work items are fairly large, I'm guessing that having one
Simon> centralized queue is fine.  Well, benchmarks will tell if that is faster
Simon> than Tom de Vries' balancing approach.

Yeah.  Also I didn't see a straightforward way to implement work
stealing.

Tom