Linux阻塞非阻塞操作的相关内容

文章 2017-11-01 来自：开发者社区

深入浅出Linux设备驱动编程－－设备的阻塞与非阻塞操作

宋宝华 [email]21cnbao@21cn.com[/email] yesky 5.设备的阻塞与非阻塞操作阻塞操作是指，在执行设备操作时，若不能获得资源，则进程挂起直到满足可操作的条件再进行操作。非阻塞操作的进程在不能进行设备操作时，并不挂起。被挂起的进程进入sleep状态，被从调度器的运行队列移走，直到等待的条件被满足。在Linux驱动程序中，我们可以使用等待队列（w...

文章 2015-06-13 来自：开发者社区

linux下串口的阻塞和非阻塞操作

有两个可以进行控制串口阻塞性（同时控制read和write）：一个是在打开串口的时候，open函数是否带O_NDELAY；第二个是可以在打开串口之后通过fcntl()函数进行控制。阻塞的定义：对于read，block指当串口输入缓冲区没有数据的时候，read函数将会阻塞在这里，移植到串口输入缓冲区中有数据可读取，read读到了需要的字节数之...

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