kthread.h
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上传日期:2009-04-28
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- #ifndef _LINUX_KTHREAD_H
- #define _LINUX_KTHREAD_H
- /* Simple interface for creating and stopping kernel threads without mess. */
- #include <linux/err.h>
- #include <linux/sched.h>
- /**
- * kthread_create: create a kthread.
- * @threadfn: the function to run until signal_pending(current).
- * @data: data ptr for @threadfn.
- * @namefmt: printf-style name for the thread.
- *
- * 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).
- */
- struct task_struct *kthread_create(int (*threadfn)(void *data),
- void *data,
- const char namefmt[], ...);
- /**
- * kthread_run: create and wake a thread.
- * @threadfn: the function to run until signal_pending(current).
- * @data: data ptr for @threadfn.
- * @namefmt: printf-style name for the thread.
- *
- * Description: Convenient wrapper for kthread_create() followed by
- * wake_up_process(). Returns the kthread, or ERR_PTR(-ENOMEM). */
- #define kthread_run(threadfn, data, namefmt, ...)
- ({
- struct task_struct *__k
- = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__);
- if (!IS_ERR(__k))
- wake_up_process(__k);
- __k;
- })
- /**
- * kthread_bind: bind a just-created kthread to a cpu.
- * @k: thread created by kthread_create().
- * @cpu: cpu (might not be online, must be possible) for @k to run on.
- *
- * Description: This function is equivalent to set_cpus_allowed(),
- * except that @cpu doesn't need to be online, and the thread must be
- * stopped (ie. just returned from kthread_create().
- */
- void kthread_bind(struct task_struct *k, unsigned int cpu);
- /**
- * kthread_stop: stop a thread created by kthread_create().
- * @k: thread created by kthread_create().
- *
- * Sets kthread_should_stop() for @k to return true, wakes it, and
- * waits for it to exit. Your threadfn() must not call do_exit()
- * itself if you use this function! This can also be called after
- * kthread_create() instead of calling wake_up_process(): the thread
- * will exit without calling threadfn().
- *
- * Returns the result of threadfn(), or -EINTR if wake_up_process()
- * was never called. */
- int kthread_stop(struct task_struct *k);
- /**
- * kthread_should_stop: should this kthread return now?
- *
- * When someone calls kthread_stop on your kthread, it will be woken
- * and this will return true. You should then return, and your return
- * value will be passed through to kthread_stop().
- */
- int kthread_should_stop(void);
- #endif /* _LINUX_KTHREAD_H */