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由 Rich Felker 提交于
this is analogous commit fffc5cda which fixed the corresponding issue for mutexes. the robust list can't be used here because the locks do not share a common layout with mutexes. at some point it may make sense to simply incorporate a mutex object into the FILE structure and use it, but that would be a much more invasive change, and it doesn't mesh well with the current design that uses a simpler code path for internal locking and pulls in the recursive-mutex-like code when the flockfile API is used explicitly.
5345c9b8