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32 results

rtmutex_common.h

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  • rtmutex_common.h 3.30 KiB
    /*
     * RT Mutexes: blocking mutual exclusion locks with PI support
     *
     * started by Ingo Molnar and Thomas Gleixner:
     *
     *  Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
     *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
     *
     * This file contains the private data structure and API definitions.
     */
    
    #ifndef __KERNEL_RTMUTEX_COMMON_H
    #define __KERNEL_RTMUTEX_COMMON_H
    
    #include <linux/rtmutex.h>
    
    /*
     * This is the control structure for tasks blocked on a rt_mutex,
     * which is allocated on the kernel stack on of the blocked task.
     *
     * @tree_entry:		pi node to enqueue into the mutex waiters tree
     * @pi_tree_entry:	pi node to enqueue into the mutex owner waiters tree
     * @task:		task reference to the blocked task
     */
    struct rt_mutex_waiter {
    	struct rb_node          tree_entry;
    	struct rb_node          pi_tree_entry;
    	struct task_struct	*task;
    	struct rt_mutex		*lock;
    #ifdef CONFIG_DEBUG_RT_MUTEXES
    	unsigned long		ip;
    	struct pid		*deadlock_task_pid;
    	struct rt_mutex		*deadlock_lock;
    #endif
    	int prio;
    };
    
    /*
     * Various helpers to access the waiters-tree:
     */
    static inline int rt_mutex_has_waiters(struct rt_mutex *lock)
    {
    	return !RB_EMPTY_ROOT(&lock->waiters);
    }
    
    static inline struct rt_mutex_waiter *
    rt_mutex_top_waiter(struct rt_mutex *lock)
    {
    	struct rt_mutex_waiter *w;
    
    	w = rb_entry(lock->waiters_leftmost, struct rt_mutex_waiter,
    		     tree_entry);
    	BUG_ON(w->lock != lock);
    
    	return w;
    }
    
    static inline int task_has_pi_waiters(struct task_struct *p)
    {
    	return !RB_EMPTY_ROOT(&p->pi_waiters);
    }
    
    static inline struct rt_mutex_waiter *
    task_top_pi_waiter(struct task_struct *p)
    {
    	return rb_entry(p->pi_waiters_leftmost, struct rt_mutex_waiter,
    			pi_tree_entry);
    }
    
    /*