Can I delete this post? I found out my own mistake. I stored shared_ptr to a data structure as shared_ptr&, and since the original share_ptr is out-of-scope, the object has reference 0 and thusly deallocated, which is why there is segfault.
I now store shared_ptr as shared_ptr, copied the whole shared_ptr into the data structure as the new container, and now problem is fixed. & is good for performance, but watch out because it's not a reference to the actual object and does not count as shared_ptr count!. On Sunday, December 10, 2017 at 7:14:55 PM UTC-5, Jasper Wu wrote: > > I'm working on a async client that keeps on sending tasks to servers. To > make it efficient and fail-tolerant, I maintain server status by constantly > checking if the channel is working. > > However, for all channel query apis, I've tried > channel::GetState(), channel::WaitForConnnected(T deadline), etc... > All of them gives segfault after multiple queries. > Does anyone know why? And how should I query about channel connectivity or > server up/down info? > > I read connectivity-semantics-and-api.md > <https://github.com/grpc/grpc/blob/master/doc/connectivity-semantics-and-api.md> > > and understand that connection status will become "TRANSIENT_FAILURE" if > the server is down. > > My goal here is to know if that server is later up so that I can > distribute tasks to it. I understand that I can simply keep sending > messages to potentially up servers and grpc will keep reconnecting if the > server is down. But I keep tasks as a pool and send the task while removing > it from the pool. And later if deadline is exceeded, I will then added back > to the pool. So if I keep sending the task to an already-known-failed > server, I would waste time resources by keep sending tasks. So any other > idea for implementing this? > > I'm not sure if I can my points clearly. My project is kind of involved > and yet I'm a newbie to this area, sorry and thanks for reading!! > -- 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 [email protected]. To post to this group, send email to [email protected]. 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/00250b6c-ddbc-48e8-86e9-e96fed32730b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
