Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 61e1a9ea authored by Alan Stern's avatar Alan Stern Committed by Linus Torvalds
Browse files

[PATCH] Add kthread_stop_sem() 



Enhance the kthread API by adding kthread_stop_sem, for use in stopping
threads that spend their idle time waiting on a semaphore.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 83521d3e

include/linux/kthread.h

+12 −0
Original line number Diff line number Diff line
@@ -69,6 +69,18 @@ void kthread_bind(struct task_struct *k, unsigned int cpu); 
 * was never called. */

int kthread_stop(struct task_struct *k);



/**

 * kthread_stop_sem: stop a thread created by kthread_create().

 * @k: thread created by kthread_create().

 * @s: semaphore that @k waits on while idle.

 *

 * Does essentially the same thing as kthread_stop() above, but wakes

 * @k by calling up(@s).

 *

 * Returns the result of threadfn(), or -EINTR if wake_up_process()

 * was never called. */

int kthread_stop_sem(struct task_struct *k, struct semaphore *s);



/**

 * kthread_should_stop: should this kthread return now?

 *

kernel/kthread.c

+11 −2
Original line number Diff line number Diff line
@@ -164,6 +164,12 @@ void kthread_bind(struct task_struct *k, unsigned int cpu) 
EXPORT_SYMBOL(kthread_bind);



int kthread_stop(struct task_struct *k)

{

	return kthread_stop_sem(k, NULL);

}

EXPORT_SYMBOL(kthread_stop);



int kthread_stop_sem(struct task_struct *k, struct semaphore *s)

{

	int ret;
@@ -178,6 +184,9 @@ int kthread_stop(struct task_struct *k) 


	/* Now set kthread_should_stop() to true, and wake it up. */

	kthread_stop_info.k = k;

	if (s)

		up(s);

	else

		wake_up_process(k);

	put_task_struct(k);
@@ -189,7 +198,7 @@ int kthread_stop(struct task_struct *k) 


	return ret;

}

EXPORT_SYMBOL(kthread_stop);

EXPORT_SYMBOL(kthread_stop_sem);



static __init int helper_init(void)

{