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authorRoland McGrath <roland@redhat.com>2008-07-25 19:45:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 12:00:09 -0700
commit85ba2d862e521375a8ee01526c5c46b1f24bb4af (patch)
treef098555cb580b2864f145aa845b574f07d2cf694 /include/linux
parent1f5a4ad97a0e7b663d527ecc02aabe203d000d91 (diff)
tracehook: wait_task_inactive
This extends wait_task_inactive() with a new argument so it can be used in a "soft" mode where it will check for the task changing state unexpectedly and back off. There is no change to existing callers. This lays the groundwork to allow robust, noninvasive tracing that can try to sample a blocked thread but back off safely if it wakes up. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Reviewed-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index a95d84d0da95..f59318a0099b 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1882,9 +1882,13 @@ extern void set_task_comm(struct task_struct *tsk, char *from);
extern char *get_task_comm(char *to, struct task_struct *tsk);
#ifdef CONFIG_SMP
-extern void wait_task_inactive(struct task_struct * p);
+extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
#else
-#define wait_task_inactive(p) do { } while (0)
+static inline unsigned long wait_task_inactive(struct task_struct *p,
+ long match_state)
+{
+ return 1;
+}
#endif
#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)