[Webkit-unassigned] [Bug 70995] The GC should be parallel

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70995





--- Comment #11 from Filip Pizlo <fpizlo at apple.com>  2011-10-29 22:35:36 PST ---
(In reply to comment #4)
> I am not sure how relevant it is, but you may want to look at wtf/ParallelJobs.h.  On the Mac it will use libdispatch, which can be fun.

One big reason why not to use libdispatch or other such mechanisms: if anyone else uses them and we stop a WebKit thread due to GC whilst it is sitting inside of some libdispatch lock (or a lock of some dependency of libdispatch, like, say, malloc), then we deadlock the whole process.

I think that even starting pthreads during a GC could be a dangerous game to play.  Hence this code makes sure that it has a pool of threads started before any GC can happen.

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