[PATCH] pi-futex: rt mutex futex api (0cdbee99) · Commits · 戴 / test

kernel/rtmutex.c

+55 −0

Original line number	Diff line number	Diff line
		@@ -903,3 +903,58 @@ void __rt_mutex_init(struct rt_mutex lock, const char name)
		debug_rt_mutex_init(lock, name);
		}
		EXPORT_SYMBOL_GPL(__rt_mutex_init);

		/**
		* rt_mutex_init_proxy_locked - initialize and lock a rt_mutex on behalf of a
		* proxy owner
		*
		* @lock: the rt_mutex to be locked
		* @proxy_owner:the task to set as owner
		*
		* No locking. Caller has to do serializing itself
		* Special API call for PI-futex support
		*/
		void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
		struct task_struct *proxy_owner)
		{
		__rt_mutex_init(lock, NULL);
		debug_rt_mutex_proxy_lock(lock, proxy_owner __RET_IP__);
		rt_mutex_set_owner(lock, proxy_owner, 0);
		rt_mutex_deadlock_account_lock(lock, proxy_owner);
		}

		/**
		* rt_mutex_proxy_unlock - release a lock on behalf of owner
		*
		* @lock: the rt_mutex to be locked
		*
		* No locking. Caller has to do serializing itself
		* Special API call for PI-futex support
		*/
		void rt_mutex_proxy_unlock(struct rt_mutex *lock,
		struct task_struct *proxy_owner)
		{
		debug_rt_mutex_proxy_unlock(lock);
		rt_mutex_set_owner(lock, NULL, 0);
		rt_mutex_deadlock_account_unlock(proxy_owner);
		}

		/**
		* rt_mutex_next_owner - return the next owner of the lock
		*
		* @lock: the rt lock query
		*
		* Returns the next owner of the lock or NULL
		*
		* Caller has to serialize against other accessors to the lock
		* itself.
		*
		* Special API call for PI-futex support
		*/
		struct task_struct rt_mutex_next_owner(struct rt_mutex lock)
		{
		if (!rt_mutex_has_waiters(lock))
		return NULL;

		return rt_mutex_top_waiter(lock)->task;
		}