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a sentinel must be black
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@ -50,6 +50,11 @@ void ngx_rbtree_insert_timer_value(ngx_rbtree_node_t *root,
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ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
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/* a sentinel must be black */
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#define ngx_rbtree_sentinel_init(node) node->color = 0
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static ngx_inline ngx_rbtree_node_t *
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ngx_rbtree_min(ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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{
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