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authorPierre Peiffer <pierre.peiffer@bull.net>2007-05-09 05:35:02 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-09 15:30:55 -0400
commitd0aa7a70bf03b9de9e995ab272293be1f7937822 (patch)
tree194b30b7b8374b946f166996cb99fb95eb3b7819 /kernel/rtmutex_common.h
parentc19384b5b296905d4988c7c684ff540a0f9d65be (diff)
futex_requeue_pi optimization
This patch provides the futex_requeue_pi functionality, which allows some threads waiting on a normal futex to be requeued on the wait-queue of a PI-futex. This provides an optimization, already used for (normal) futexes, to be used with the PI-futexes. This optimization is currently used by the glibc in pthread_broadcast, when using "normal" mutexes. With futex_requeue_pi, it can be used with PRIO_INHERIT mutexes too. Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net> Cc: Ingo Molnar <mingo@elte.hu> Cc: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/rtmutex_common.h')
-rw-r--r--kernel/rtmutex_common.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/kernel/rtmutex_common.h b/kernel/rtmutex_common.h
index 9c75856e791e..242ec7ee740b 100644
--- a/kernel/rtmutex_common.h
+++ b/kernel/rtmutex_common.h
@@ -113,6 +113,29 @@ static inline unsigned long rt_mutex_owner_pending(struct rt_mutex *lock)
113} 113}
114 114
115/* 115/*
116 * We can speed up the acquire/release, if the architecture
117 * supports cmpxchg and if there's no debugging state to be set up
118 */
119#if defined(__HAVE_ARCH_CMPXCHG) && !defined(CONFIG_DEBUG_RT_MUTEXES)
120# define rt_mutex_cmpxchg(l,c,n) (cmpxchg(&l->owner, c, n) == c)
121static inline void mark_rt_mutex_waiters(struct rt_mutex *lock)
122{
123 unsigned long owner, *p = (unsigned long *) &lock->owner;
124
125 do {
126 owner = *p;
127 } while (cmpxchg(p, owner, owner | RT_MUTEX_HAS_WAITERS) != owner);
128}
129#else
130# define rt_mutex_cmpxchg(l,c,n) (0)
131static inline void mark_rt_mutex_waiters(struct rt_mutex *lock)
132{
133 lock->owner = (struct task_struct *)
134 ((unsigned long)lock->owner | RT_MUTEX_HAS_WAITERS);
135}
136#endif
137
138/*
116 * PI-futex support (proxy locking functions, etc.): 139 * PI-futex support (proxy locking functions, etc.):
117 */ 140 */
118extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock); 141extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock);
@@ -120,4 +143,15 @@ extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
120 struct task_struct *proxy_owner); 143 struct task_struct *proxy_owner);
121extern void rt_mutex_proxy_unlock(struct rt_mutex *lock, 144extern void rt_mutex_proxy_unlock(struct rt_mutex *lock,
122 struct task_struct *proxy_owner); 145 struct task_struct *proxy_owner);
146
147extern void rt_mutex_set_owner(struct rt_mutex *lock, struct task_struct *owner,
148 unsigned long mask);
149extern void __rt_mutex_adjust_prio(struct task_struct *task);
150extern int rt_mutex_adjust_prio_chain(struct task_struct *task,
151 int deadlock_detect,
152 struct rt_mutex *orig_lock,
153 struct rt_mutex_waiter *orig_waiter,
154 struct task_struct *top_task);
155extern void remove_waiter(struct rt_mutex *lock,
156 struct rt_mutex_waiter *waiter);
123#endif 157#endif