context_query_cmp
int context_query_cmp(const void* a, const void* b);
rbtree_init(&ctx->queries, &context_query_cmp);
else if(fptr == &context_query_cmp) return 1;
int context_query_cmp(const void* a, const void* b);
rbtree_init(&ctx->queries, &context_query_cmp);
else if(fptr == &context_query_cmp) return 1;