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TOMOYO Linux Cross Reference
Linux/include/linux/rtmutex.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * RT Mutexes: blocking mutual exclusion locks with PI support
  4  *
  5  * started by Ingo Molnar and Thomas Gleixner:
  6  *
  7  *  Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
  8  *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
  9  *
 10  * This file contains the public data structure and API definitions.
 11  */
 12 
 13 #ifndef __LINUX_RT_MUTEX_H
 14 #define __LINUX_RT_MUTEX_H
 15 
 16 #include <linux/linkage.h>
 17 #include <linux/rbtree.h>
 18 #include <linux/spinlock_types.h>
 19 
 20 extern int max_lock_depth; /* for sysctl */
 21 
 22 /**
 23  * The rt_mutex structure
 24  *
 25  * @wait_lock:  spinlock to protect the structure
 26  * @waiters:    rbtree root to enqueue waiters in priority order;
 27  *              caches top-waiter (leftmost node).
 28  * @owner:      the mutex owner
 29  */
 30 struct rt_mutex {
 31         raw_spinlock_t          wait_lock;
 32         struct rb_root_cached   waiters;
 33         struct task_struct      *owner;
 34 #ifdef CONFIG_DEBUG_RT_MUTEXES
 35         int                     save_state;
 36         const char              *name, *file;
 37         int                     line;
 38         void                    *magic;
 39 #endif
 40 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 41         struct lockdep_map      dep_map;
 42 #endif
 43 };
 44 
 45 struct rt_mutex_waiter;
 46 struct hrtimer_sleeper;
 47 
 48 #ifdef CONFIG_DEBUG_RT_MUTEXES
 49  extern int rt_mutex_debug_check_no_locks_freed(const void *from,
 50                                                 unsigned long len);
 51  extern void rt_mutex_debug_check_no_locks_held(struct task_struct *task);
 52 #else
 53  static inline int rt_mutex_debug_check_no_locks_freed(const void *from,
 54                                                        unsigned long len)
 55  {
 56         return 0;
 57  }
 58 # define rt_mutex_debug_check_no_locks_held(task)       do { } while (0)
 59 #endif
 60 
 61 #ifdef CONFIG_DEBUG_RT_MUTEXES
 62 # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
 63         , .name = #mutexname, .file = __FILE__, .line = __LINE__
 64 
 65 # define rt_mutex_init(mutex) \
 66 do { \
 67         static struct lock_class_key __key; \
 68         __rt_mutex_init(mutex, __func__, &__key); \
 69 } while (0)
 70 
 71  extern void rt_mutex_debug_task_free(struct task_struct *tsk);
 72 #else
 73 # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
 74 # define rt_mutex_init(mutex)                   __rt_mutex_init(mutex, NULL, NULL)
 75 # define rt_mutex_debug_task_free(t)                    do { } while (0)
 76 #endif
 77 
 78 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 79 #define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname) \
 80         , .dep_map = { .name = #mutexname }
 81 #else
 82 #define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)
 83 #endif
 84 
 85 #define __RT_MUTEX_INITIALIZER(mutexname) \
 86         { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
 87         , .waiters = RB_ROOT_CACHED \
 88         , .owner = NULL \
 89         __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
 90         __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)}
 91 
 92 #define DEFINE_RT_MUTEX(mutexname) \
 93         struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
 94 
 95 /**
 96  * rt_mutex_is_locked - is the mutex locked
 97  * @lock: the mutex to be queried
 98  *
 99  * Returns 1 if the mutex is locked, 0 if unlocked.
100  */
101 static inline int rt_mutex_is_locked(struct rt_mutex *lock)
102 {
103         return lock->owner != NULL;
104 }
105 
106 extern void __rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key);
107 extern void rt_mutex_destroy(struct rt_mutex *lock);
108 
109 extern void rt_mutex_lock(struct rt_mutex *lock);
110 extern int rt_mutex_lock_interruptible(struct rt_mutex *lock);
111 extern int rt_mutex_timed_lock(struct rt_mutex *lock,
112                                struct hrtimer_sleeper *timeout);
113 
114 extern int rt_mutex_trylock(struct rt_mutex *lock);
115 
116 extern void rt_mutex_unlock(struct rt_mutex *lock);
117 
118 #endif
119 

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