gh-117657: Fix itertools.count thread safety #119267
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Thread safety in count_next. count_next has two modes. slow mode (obj->cnt set to PY_SSIZE_T_MAX), which now uses the object mutex (only if GIL is disabled) and fast mode, which is either simple cnt++ if GIL is enabled, or uses atomic_compare_exchange if GIL is disabled.
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Thread safety in count_next. count_next has two modes. slow mode (obj->cnt set to PY_SSIZE_T_MAX), which now uses the object mutex (only if GIL is disabled) and fast mode, which is either simple cnt++ if GIL is enabled, or uses atomic_compare_exchange if GIL is disabled.