The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
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其中，2 月 23 日发送旅客 1873.3 万人次，创春运单日旅客发送量历史新高。，详情可参考旺商聊官方下载
└─ AF_UNIX SEQPACKET ─→ Launcher