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Handle circular dependency

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Handle the situation if a stream is told to depend on its descendant.
This is what
http://tools.ietf.org/html/draft-ietf-httpbis-http2-12#section-5.3.3
says.
This commit is contained in:
Tatsuhiro Tsujikawa
2014-04-24 23:44:34 +09:00
parent 853c9888d9
commit ee26469cd9
2 changed files with 8 additions and 6 deletions
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7
lib/nghttp2_session.c
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@@ -492,14 +492,15 @@ int nghttp2_session_reprioritize_stream
return 0;
}
/* Ignore priority request if resultant tree has cycle */
if(nghttp2_stream_dep_subtree_find(stream, dep_stream)) {
DEBUGF(fprintf(stderr,
"stream: future cycle detected, dep_stream(%p)=%d "
"stream: cycle detected, dep_stream(%p)=%d "
"stream(%p)=%d\n",
dep_stream, dep_stream->stream_id,
stream, stream->stream_id));
return 0;
nghttp2_stream_dep_remove_subtree(dep_stream);
nghttp2_stream_dep_make_root(dep_stream, &session->ob_pq);
}
nghttp2_stream_dep_remove_subtree(stream);