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分享请教两个关于kernel thread的问题。
（1）看有的资料上说，kernel thread启动之后将一直运行，直到thread func调用do_exit。那如果thread func没有调用do_exit，而是直接return了会怎样呢？
（2）如果kernel thread的创建者想要监控一下新线程的运行状态，有没有简单的类似user space中的那种wait的机制？
以上问题假定通过kthread_create或kthread_run创建内核线程。
（2）如果kernel thread的创建者想要监控一下新线程的运行状态，有没有简单的类似user space中的那种wait的机制？
以上问题假定通过kthread_create或kthread_run创建内核线程。
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晨星 2009-12-13
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谢谢猪头，呵呵。
结帖。
结帖。
hallowwar 2009-12-13
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如此深奥。
playmud 2009-12-13
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http://www.gnugeneration.com/books/linux/2.6.20/kernel-api/
晨星 2009-12-13
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多谢楼上，能否告知这段文字是来自哪里的？
或者哪里能找到详细一点的内核API的文档？
或者哪里能找到详细一点的内核API的文档？
Wenxy1 2009-12-13
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kthread_create
Inne wersje manuala:
* kthread_create (9freebsd) - The function is used to start daemons such as bufdaemon, pagedaemon, vmdaemon, and the syncer and is intended to be called from The argument is actual...
Name
kthread_create - create a kthread.
Synopsis
struct task_struct * kthread_create(int (*threadfn) (void *data), void * data, const char namefmt[], ...);
Arguments
threadfn
the function to run until signal_pending(current).
data
data ptr for threadfn.
namefmt[]
printf-style name for the thread.
...
variable arguments
Description
This helper function creates and names a kernel thread. The thread will be stopped: use wake_up_process to start it. See also kthread_run, kthread_create_on_cpu.
When woken, the thread will run threadfn() with data as its argument. threadfn() can either call do_exit directly if it is a standalone thread for which noone will call kthread_stop, or return when ´kthread_should_stop´ is true (which means kthread_stop has been called). The return value should be zero or a negative error number; it will be passed to kthread_stop.
Returns a task_struct or ERR_PTR(-ENOMEM).
Inne wersje manuala:
* kthread_create (9freebsd) - The function is used to start daemons such as bufdaemon, pagedaemon, vmdaemon, and the syncer and is intended to be called from The argument is actual...
Name
kthread_create - create a kthread.
Synopsis
struct task_struct * kthread_create(int (*threadfn) (void *data), void * data, const char namefmt[], ...);
Arguments
threadfn
the function to run until signal_pending(current).
data
data ptr for threadfn.
namefmt[]
printf-style name for the thread.
...
variable arguments
Description
This helper function creates and names a kernel thread. The thread will be stopped: use wake_up_process to start it. See also kthread_run, kthread_create_on_cpu.
When woken, the thread will run threadfn() with data as its argument. threadfn() can either call do_exit directly if it is a standalone thread for which noone will call kthread_stop, or return when ´kthread_should_stop´ is true (which means kthread_stop has been called). The return value should be zero or a negative error number; it will be passed to kthread_stop.
Returns a task_struct or ERR_PTR(-ENOMEM).
晨星 2009-12-13
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第一个已经有点明白了，好像是说：如果是个独立的线程（别人不会对它调用kthread_stop），则应该自己调用do_exit退出；否则，应该在别人调用kthread_stop（从而被终止线程将检测到kthread_should_stop()）之后通过return将一个0值或者错误码返回给kthread_stop的调用者。
是这样吧？
是这样吧？
