如何使用 Linux 工作队列 [英] How to use Linux Work Queue

问题描述

Linux 工作队列是具有进程上下文的内核级线程.我试图将它用作没有特定进程上下文的 kthread 的替代方案.但是如何将数据传递到工作队列?work_struct 有一个类型为 atomic_long_t 的数据字段.我无法传递指向该字段的指针.我该怎么做?

Linux work queues are meant to be kernel level threads with process context. I was trying to use it as an alternative to kthread which has no specific process context. But how do I pass data to work queue? work_struct has a data field which is of type atomic_long_t. I could not pass pointer to this field. How do I do it?

我也找不到工作队列的一个具体例子.你能推荐一个吗?

Also I could not find a single concrete example of work queue. Can you suggest one?

推荐答案

如果你想将数据传递给你的工作队列函数，只需将 work_struct 结构嵌入你自己的数据结构中并使用 container_of 在您的工作函数中检索它.

If you want to pass data to your work queue function, just embed the work_struct structure inside your own data structure and use container_of inside your work function to retrieve it.

举个简单的例子，内核中充满了它——只是git grep work_struct.您可以查看 drivers/cpufreq/cpufreq.c(handle_update 函数)的简单示例.下面的文章也在最后嵌入了一个示例，但它没有使用 container_of 而是依赖于结构的第一个成员与其父级具有相同地址的事实:

As for a simple example, the kernel is full of it - just git grep work_struct. You can look at drivers/cpufreq/cpufreq.c (handle_update function) for a simple example. The article below also embeds an example at the end, but it does not use container_of and instead relies on the fact that the first member of a structure has the same address as its parent:

http://www.ibm.com/developerworks/linux/library/l-tasklets/index.html

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