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configure.ac

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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);
    }
    
    /*
     * lock->owner state tracking:
     */
    #define RT_MUTEX_HAS_WAITERS	1UL
    #define RT_MUTEX_OWNER_MASKALL	1UL
    
    static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock)
    {
    	unsigned long owner = (unsigned long) READ_ONCE(lock->owner);
    
    	return (struct task_struct *) (owner & ~RT_MUTEX_OWNER_MASKALL);
    }
    
    /*
     * Constants for rt mutex functions which have a selectable deadlock
     * detection.
     *
     * RT_MUTEX_MIN_CHAINWALK:	Stops the lock chain walk when there are
     *				no further PI adjustments to be made.
     *
     * RT_MUTEX_FULL_CHAINWALK:	Invoke deadlock detection with a full
     *				walk of the lock chain.
     */
    enum rtmutex_chainwalk {
    	RT_MUTEX_MIN_CHAINWALK,
    	RT_MUTEX_FULL_CHAINWALK,
    };
    
    /*
     * PI-futex support (proxy locking functions, etc.):
     */
    extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock);
    extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
    				       struct task_struct *proxy_owner);
    extern void rt_mutex_proxy_unlock(struct rt_mutex *lock,
    				  struct task_struct *proxy_owner);
    extern int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
    				     struct rt_mutex_waiter *waiter,
    				     struct task_struct *task);
    extern int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
    				      struct hrtimer_sleeper *to,
    				      struct rt_mutex_waiter *waiter);
    extern int rt_mutex_timed_futex_lock(struct rt_mutex *l, struct hrtimer_sleeper *to);
    extern bool rt_mutex_futex_unlock(struct rt_mutex *lock,
    				  struct wake_q_head *wqh);
    extern void rt_mutex_adjust_prio(struct task_struct *task);
    
    #ifdef CONFIG_DEBUG_RT_MUTEXES
    # include "rtmutex-debug.h"
    #else
    # include "rtmutex.h"
    #endif
    
    #endif