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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。业内人士推荐爱思助手下载最新版本作为进阶阅读
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The locking problem，这一点在WPS下载最新地址中也有详细论述
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