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Magne Sjaastad
eec9a88bd3
All four cell filter loops guarded a push_back into a shared container with an unnamed critical section, taking a process wide lock for every cell matching the polygon. On large grids with a permissive polygon this can be slower than running single threaded, and it made the resulting cell order vary between runs. Collect the cells in per thread buffers and append them in thread order after the parallel region, following the pattern used elsewhere in the code base. This removes eight critical sections.