如何在 linux 驱动程序模块中暂停 100+ 毫秒？
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How can I pause for 100+ milliseconds in a linux driver module?
提问by Jamie
I'm writing a kernel driver for a device that produces regular amounts of data for reading periodically. The user space program is ideally suited to making this a blocking driver.
我正在为一个设备编写内核驱动程序，该设备会产生定期读取的定期数据量。用户空间程序非常适合使其成为阻塞驱动程序。
What methods are available for pausing anywhere from 4 to 100ms in a driver (i.e. doing the "block")? In user space I'd do something akin to:
有哪些方法可以在驱动程序中暂停 4 到 100 毫秒（即执行“阻止”）？在用户空间我会做一些类似于：
tv.tv_sec = microsecond_delay / 1000000ul;
tv.tv_usec = microsecond_delay % 1000000ul;
(void)select(0, NULL, NULL, NULL, & tv);
or
或者
gettimeofday(tv,NULL);
and compare the structures.
并比较结构。
[Edit - my own answer]
[编辑 - 我自己的答案]
I will be using the following code in my driver:
我将在我的驱动程序中使用以下代码：
#include <linux/jiffies.h>
...
schedule_timeout(file->private_data->my_driver_struct.read_pause_jiffies);
Voila! I shall now test ...
瞧！我现在要测试...
采纳答案by Jamie
#include <linux/delay.h>
...
msleep(100);
...
回答by adrianmcmenamin
Using schedule_timeout does NOT sleep for a specified time but for a minimum specified time. If you really want to blockfor a specified time, you will have to use locks. Sleeping will only guarantee you a minimum time - this may not matter to you depending on much granularity you need. But a better driver would sleep until the reader asked for more data in any case.
使用 schedule_timeout 不会休眠指定的时间，而是休眠指定的最短时间。如果你真的想阻塞指定的时间，你将不得不使用锁。睡眠只能保证您有最少的时间 - 这对您来说可能无关紧要，具体取决于您需要的粒度。但是，无论如何，更好的驱动程序会一直睡到读者要求提供更多数据为止。
