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authorAlan Stern <stern@rowland.harvard.edu>2005-10-30 18:01:40 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 20:37:17 -0500
commit61e1a9ea4b425eb8c3b4965c35fe953bd881728f (patch)
tree2dcf017eedd4a72698593c878aff3ae31e3a6b09
parent83521d3eb8dd2dfb04dd78b4733e9766f61bb47e (diff)
[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: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/linux/kthread.h12
-rw-r--r--kernel/kthread.c13
2 files changed, 23 insertions, 2 deletions
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 3fa786448db3..ebdd41fd1082 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -70,6 +70,18 @@ void kthread_bind(struct task_struct *k, unsigned int cpu);
70int kthread_stop(struct task_struct *k); 70int kthread_stop(struct task_struct *k);
71 71
72/** 72/**
73 * kthread_stop_sem: stop a thread created by kthread_create().
74 * @k: thread created by kthread_create().
75 * @s: semaphore that @k waits on while idle.
76 *
77 * Does essentially the same thing as kthread_stop() above, but wakes
78 * @k by calling up(@s).
79 *
80 * Returns the result of threadfn(), or -EINTR if wake_up_process()
81 * was never called. */
82int kthread_stop_sem(struct task_struct *k, struct semaphore *s);
83
84/**
73 * kthread_should_stop: should this kthread return now? 85 * kthread_should_stop: should this kthread return now?
74 * 86 *
75 * When someone calls kthread_stop on your kthread, it will be woken 87 * When someone calls kthread_stop on your kthread, it will be woken
diff --git a/kernel/kthread.c b/kernel/kthread.c
index f50f174e92da..e75950a1092c 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -165,6 +165,12 @@ EXPORT_SYMBOL(kthread_bind);
165 165
166int kthread_stop(struct task_struct *k) 166int kthread_stop(struct task_struct *k)
167{ 167{
168 return kthread_stop_sem(k, NULL);
169}
170EXPORT_SYMBOL(kthread_stop);
171
172int kthread_stop_sem(struct task_struct *k, struct semaphore *s)
173{
168 int ret; 174 int ret;
169 175
170 down(&kthread_stop_lock); 176 down(&kthread_stop_lock);
@@ -178,7 +184,10 @@ int kthread_stop(struct task_struct *k)
178 184
179 /* Now set kthread_should_stop() to true, and wake it up. */ 185 /* Now set kthread_should_stop() to true, and wake it up. */
180 kthread_stop_info.k = k; 186 kthread_stop_info.k = k;
181 wake_up_process(k); 187 if (s)
188 up(s);
189 else
190 wake_up_process(k);
182 put_task_struct(k); 191 put_task_struct(k);
183 192
184 /* Once it dies, reset stop ptr, gather result and we're done. */ 193 /* Once it dies, reset stop ptr, gather result and we're done. */
@@ -189,7 +198,7 @@ int kthread_stop(struct task_struct *k)
189 198
190 return ret; 199 return ret;
191} 200}
192EXPORT_SYMBOL(kthread_stop); 201EXPORT_SYMBOL(kthread_stop_sem);
193 202
194static __init int helper_init(void) 203static __init int helper_init(void)
195{ 204{