LCOV - code coverage report
Current view: top level - lkbce/include/linux - rtmutex.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       1             : /*
       2             :  * RT Mutexes: blocking mutual exclusion locks with PI support
       3             :  *
       4             :  * started by Ingo Molnar and Thomas Gleixner:
       5             :  *
       6             :  *  Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
       7             :  *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
       8             :  *
       9             :  * This file contains the public data structure and API definitions.
      10             :  */
      11             : 
      12             : #ifndef __LINUX_RT_MUTEX_H
      13             : #define __LINUX_RT_MUTEX_H
      14             : 
      15             : #include <linux/linkage.h>
      16             : #include <linux/plist.h>
      17             : #include <linux/spinlock_types.h>
      18             : 
      19             : /**
      20             :  * The rt_mutex structure
      21             :  *
      22             :  * @wait_lock:  spinlock to protect the structure
      23             :  * @wait_list:  pilist head to enqueue waiters in priority order
      24             :  * @owner:      the mutex owner
      25             :  */
      26             : struct rt_mutex {
      27             :         raw_spinlock_t          wait_lock;
      28             :         struct plist_head       wait_list;
      29             :         struct task_struct      *owner;
      30             : #ifdef CONFIG_DEBUG_RT_MUTEXES
      31           1 :         int                     save_state;
      32             :         const char              *name, *file;
      33             :         int                     line;
      34             :         void                    *magic;
      35             : #endif
      36             : };
      37             : 
      38             : struct rt_mutex_waiter;
      39             : struct hrtimer_sleeper;
      40             : 
      41             : #ifdef CONFIG_DEBUG_RT_MUTEXES
      42             :  extern int rt_mutex_debug_check_no_locks_freed(const void *from,
      43             :                                                 unsigned long len);
      44             :  extern void rt_mutex_debug_check_no_locks_held(struct task_struct *task);
      45             : #else
      46             :  static inline int rt_mutex_debug_check_no_locks_freed(const void *from,
      47             :                                                        unsigned long len)
      48             :  {
      49             :         return 0;
      50             :  }
      51             : # define rt_mutex_debug_check_no_locks_held(task)       do { } while (0)
      52             : #endif
      53             : 
      54             : #ifdef CONFIG_DEBUG_RT_MUTEXES
      55             : # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
      56             :         , .name = #mutexname, .file = __FILE__, .line = __LINE__
      57             : # define rt_mutex_init(mutex)                   __rt_mutex_init(mutex, __func__)
      58             :  extern void rt_mutex_debug_task_free(struct task_struct *tsk);
      59             : #else
      60             : # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
      61             : # define rt_mutex_init(mutex)                   __rt_mutex_init(mutex, NULL)
      62             : # define rt_mutex_debug_task_free(t)                    do { } while (0)
      63             : #endif
      64             : 
      65             : #define __RT_MUTEX_INITIALIZER(mutexname) \
      66             :         { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
      67             :         , .wait_list = PLIST_HEAD_INIT_RAW(mutexname.wait_list, mutexname.wait_lock) \
      68             :         , .owner = NULL \
      69             :         __DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
      70             : 
      71             : #define DEFINE_RT_MUTEX(mutexname) \
      72             :         struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
      73             : 
      74             : /**
      75             :  * rt_mutex_is_locked - is the mutex locked
      76             :  * @lock: the mutex to be queried
      77             :  *
      78             :  * Returns 1 if the mutex is locked, 0 if unlocked.
      79             :  */
      80             : static inline int rt_mutex_is_locked(struct rt_mutex *lock)
      81             : {
      82             :         return lock->owner != NULL;
      83             : }
      84             : 
      85             : extern void __rt_mutex_init(struct rt_mutex *lock, const char *name);
      86             : extern void rt_mutex_destroy(struct rt_mutex *lock);
      87             : 
      88             : extern void rt_mutex_lock(struct rt_mutex *lock);
      89             : extern int rt_mutex_lock_interruptible(struct rt_mutex *lock,
      90             :                                                 int detect_deadlock);
      91             : extern int rt_mutex_timed_lock(struct rt_mutex *lock,
      92             :                                         struct hrtimer_sleeper *timeout,
      93             :                                         int detect_deadlock);
      94             : 
      95             : extern int rt_mutex_trylock(struct rt_mutex *lock);
      96             : 
      97             : extern void rt_mutex_unlock(struct rt_mutex *lock);
      98             : 
      99             : #ifdef CONFIG_RT_MUTEXES
     100             : # define INIT_RT_MUTEXES(tsk)                                           \
     101             :         .pi_waiters     = PLIST_HEAD_INIT(tsk.pi_waiters, tsk.pi_lock), \
     102             :         INIT_RT_MUTEX_DEBUG(tsk)
     103             : #else
     104             : # define INIT_RT_MUTEXES(tsk)
     105             : #endif
     106             : 
     107             : #endif

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