This topic created in 1418 days ago, the information mentioned may be changed or developed.
比如：
sema = make(chan struct{}, 1)
和 sema = make(chan struct{})
都是只能放一个元素，读取之前再放的话就会等待
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1
iBugOne Jun 21, 2022  1
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qianxi0410 Jun 21, 2022
unbuffered channel 会卡发送者，buffer channel 不卡
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