Hi Wankai, The following design document explains the rationale behind the new epoll implementation. Polling island was added as a part of this change. https://github.com/grpc/grpc/blob/master/doc/epoll-polling-engine.md (see section 4).
Here is some high level summary: - Polling island represents the underlying epoll set containing the file descriptors (which is why it contains the epoll-fd) - The main idea in having them is to prevent a file descriptor from being in multiple epoll sets. This means that whenever we add a file descriptor (that already belongs to an epoll set) to another epoll set, we merge the underlying polling islands and old polling island's merged_to field points to the new polling island.. the document's section 4 explains it all thanks, Sree On Tue, Oct 18, 2016 at 8:38 AM, Wankai Zhang <wankaizhan...@gmail.com> wrote: > > Hello, all: > I am using c/c++. > I am confused of polling_island data structure. Why it contains a field > "merged_to" ? > Could anyone help me? > > -- > You received this message because you are subscribed to the Google Groups " > grpc.io" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to grpc-io+unsubscr...@googlegroups.com. > To post to this group, send email to firstname.lastname@example.org. > Visit this group at https://groups.google.com/group/grpc-io. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/grpc-io/24a57321-0d44-407c-95c4-f4debd94055c%40googlegroups.com > <https://groups.google.com/d/msgid/grpc-io/24a57321-0d44-407c-95c4-f4debd94055c%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to grpc-io+unsubscr...@googlegroups.com. To post to this group, send email to email@example.com. Visit this group at https://groups.google.com/group/grpc-io. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/CALRi9QfBp2nYLyDct4noMLRDEZ3orCypBqtxHRvw2PS64s2NHA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.