diff options
| author | Ingo Molnar <mingo@elte.hu> | 2005-01-07 21:49:36 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@evo.osdl.org> | 2005-01-07 21:49:36 -0800 |
| commit | f6aaca35e0aa4c7e3de79ace85f7380f4d451648 (patch) | |
| tree | bcd1e7b3e355dc2f2c1d71c8b2deb023ac36d074 /include/linux | |
| parent | 3365d1671c8f5f1ede7a07dcc632e70a385f27ad (diff) | |
[PATCH] add lock_need_resched()
Add lock_need_resched() which is to check for the necessity of lock-break
in a critical section. Used by later latency-break patches.
tested on x86, should work on all architectures.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 2b2282104bb4..c69d26d50fb0 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1083,6 +1083,17 @@ extern int cond_resched_lock(spinlock_t * lock); # define need_lockbreak(lock) 0 #endif +/* + * Does a critical section need to be broken due to another + * task waiting or preemption being signalled: + */ +static inline int lock_need_resched(spinlock_t *lock) +{ + if (need_lockbreak(lock) || need_resched()) + return 1; + return 0; +} + /* Reevaluate whether the task has signals pending delivery. This is required every time the blocked sigset_t changes. callers must hold sighand->siglock. */ |