Sharing data when download the same object from upstream (take 2)
alex.garzao at azion.com
Tue Sep 24 21:15:36 UTC 2013
I have some doubts, and I will appreciate if someone help me :-)
I posted something about this some days ago .
Basically, in the node tree that keeps the objects in the cache, I
inserted a list that keeps all listeners  and a FD that points to
tempfile. In ngx_http_upstream.c, after the call to ngx_event_pipe(),
I try to send data to all listeners.
The list and FD are in shared memory, and all processs can use them.
When NGINX starts with 1 worker, my patch works well. But, when it
starts with more than 1 worker, I have some problems. In fact, if a
request is in process 1 (P1), and requests from other process (P2) are
added in the listeners list, P1 can iterate in this list, but it
cannot send data to requests from P2 :-/
If possible, I would like some suggestions about how can I address this issue.
Thanks for your attention.
 - http://mailman.nginx.org/pipermail/nginx-devel/2013-August/004112.html
 - Listeners are requests that are waiting data from upstream
 - Request that connected to upstream
Projetista de Software
alex.garzao (at) azion.com
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