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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/compiler.h>
 17 #include <linux/linkage.h>
 18 #include <linux/rbtree_types.h>
 19 #include <linux/spinlock_types_raw.h>
 20 
 21 extern int max_lock_depth; /* for sysctl */
 22 
 23 struct rt_mutex_base {
 24         raw_spinlock_t          wait_lock;
 25         struct rb_root_cached   waiters;
 26         struct task_struct      *owner;
 27 };
 28 
 29 #define __RT_MUTEX_BASE_INITIALIZER(rtbasename)                         \
 30 {                                                                       \
 31         .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(rtbasename.wait_lock),    \
 32         .waiters = RB_ROOT_CACHED,                                      \
 33         .owner = NULL                                                   \
 34 }
 35 
 36 /**
 37  * rt_mutex_base_is_locked - is the rtmutex locked
 38  * @lock: the mutex to be queried
 39  *
 40  * Returns true if the mutex is locked, false if unlocked.
 41  */
 42 static inline bool rt_mutex_base_is_locked(struct rt_mutex_base *lock)
 43 {
 44         return READ_ONCE(lock->owner) != NULL;
 45 }
 46 
 47 extern void rt_mutex_base_init(struct rt_mutex_base *rtb);
 48 
 49 /**
 50  * The rt_mutex structure
 51  *
 52  * @wait_lock:  spinlock to protect the structure
 53  * @waiters:    rbtree root to enqueue waiters in priority order;
 54  *              caches top-waiter (leftmost node).
 55  * @owner:      the mutex owner
 56  */
 57 struct rt_mutex {
 58         struct rt_mutex_base    rtmutex;
 59 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 60         struct lockdep_map      dep_map;
 61 #endif
 62 };
 63 
 64 struct rt_mutex_waiter;
 65 struct hrtimer_sleeper;
 66 
 67 #ifdef CONFIG_DEBUG_RT_MUTEXES
 68 extern void rt_mutex_debug_task_free(struct task_struct *tsk);
 69 #else
 70 static inline void rt_mutex_debug_task_free(struct task_struct *tsk) { }
 71 #endif
 72 
 73 #define rt_mutex_init(mutex) \
 74 do { \
 75         static struct lock_class_key __key; \
 76         __rt_mutex_init(mutex, __func__, &__key); \
 77 } while (0)
 78 
 79 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 80 #define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)       \
 81         .dep_map = {                                    \
 82                 .name = #mutexname,                     \
 83                 .wait_type_inner = LD_WAIT_SLEEP,       \
 84         }
 85 #else
 86 #define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)
 87 #endif
 88 
 89 #define __RT_MUTEX_INITIALIZER(mutexname)                               \
 90 {                                                                       \
 91         .rtmutex = __RT_MUTEX_BASE_INITIALIZER(mutexname.rtmutex),      \
 92         __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)                       \
 93 }
 94 
 95 #define DEFINE_RT_MUTEX(mutexname) \
 96         struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
 97 
 98 extern void __rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key);
 99 
100 #ifdef CONFIG_DEBUG_LOCK_ALLOC
101 extern void rt_mutex_lock_nested(struct rt_mutex *lock, unsigned int subclass);
102 extern void _rt_mutex_lock_nest_lock(struct rt_mutex *lock, struct lockdep_map *nest_lock);
103 #define rt_mutex_lock(lock) rt_mutex_lock_nested(lock, 0)
104 #define rt_mutex_lock_nest_lock(lock, nest_lock)                        \
105         do {                                                            \
106                 typecheck(struct lockdep_map *, &(nest_lock)->dep_map); \
107                 _rt_mutex_lock_nest_lock(lock, &(nest_lock)->dep_map);  \
108         } while (0)
109 
110 #else
111 extern void rt_mutex_lock(struct rt_mutex *lock);
112 #define rt_mutex_lock_nested(lock, subclass) rt_mutex_lock(lock)
113 #define rt_mutex_lock_nest_lock(lock, nest_lock) rt_mutex_lock(lock)
114 #endif
115 
116 extern int rt_mutex_lock_interruptible(struct rt_mutex *lock);
117 extern int rt_mutex_lock_killable(struct rt_mutex *lock);
118 extern int rt_mutex_trylock(struct rt_mutex *lock);
119 
120 extern void rt_mutex_unlock(struct rt_mutex *lock);
121 
122 #endif
123 

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