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非阻塞模式下sl_send()的一些问题



程序中只对服务器端发送数据,具体代码如图

客户端每次发送40个,为何接收端只能接收2160(56次)个数据就在也接收不到了

请问下这是什么问题   我在阻塞模式下两边都能正常运行