'Twas brillig, and Nathan Nobbe at 11/02/09 00:10 did gyre and gimble:
a lot of php extensions are not thread safe, perhaps apc is one of them. most people compile apache w/ mpm_prefork rather than mpm_worker for this reason.
I know the problem is solved now but I think APC is pretty solid threading wise. It has various locking mechanisms that you can compile in to APC, including filelocks, IPC semaphores, spinlocks and pthread mutexes.
So while I don't want to comment inaccurately, I suspect that APC is pretty solid in this area.
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