AMDG Space Ship Traveller wrote:
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I'm experiencing a very infrequent crash at the line marked with (*). The note is a reference counted pointer (boost::intrusive_ptr), but by the time we get here, this pointer is invalid, even though there are still references to it in the system. The odd thing is, further up the chain (and on the same thread), I'm checking to ensure that note is valid, i.e.
//... display update system, separate thread from event-loop. ensure(ctx->notificationSource); loop->postNotification(ctx->notificationSource); //...
After writing this far in the email, I'm starting to see something where there could be an error. Is it possible that the object reference count is being messed up due to multi-threading issues? I.e. if the object is being passed around on two separate threads, having the reference count incremented and decremented at the same time? Actually, it seems obvious that this could be a problem...
Are there any "patterns" for using reference counted objects across different threads?
shared_ptr's reference count is thread safe. For intrusive_ptr, it depends on how you define the reference count. In Christ, Steven Watanabe