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: Use atomic operations for gcstate->collecting (
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: Use atomic operations for `gcstate->collecting` The `collecting` field in `GCState` is used to prevent overlapping garbage collections within the same interpreter. This is updated to use atomic operations in order to be thread-safe in `--disable-gil` builds. The GC code is refactored a bit to support this. More of the logic is pushed down to `gc_collect_main()` so that we can safely order the logic setting `collecting`, the selection of the generation, and the invocation of callbacks with respect to the atomic operations and the (future) stop-the-world pauses. The change uses atomic operations for both `--disable-gil` and the default build (with the GIL) to avoid extra `#ifdef` guards and ease the maintenance burden.1 file changed
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