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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
19extern int max_lock_depth;
20
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27
28struct rt_mutex {
29 raw_spinlock_t wait_lock;
30 struct plist_head wait_list;
31 struct task_struct *owner;
32#ifdef CONFIG_DEBUG_RT_MUTEXES
33 int save_state;
34 const char *name, *file;
35 int line;
36 void *magic;
37#endif
38};
39
40struct rt_mutex_waiter;
41struct hrtimer_sleeper;
42
43#ifdef CONFIG_DEBUG_RT_MUTEXES
44 extern int rt_mutex_debug_check_no_locks_freed(const void *from,
45 unsigned long len);
46 extern void rt_mutex_debug_check_no_locks_held(struct task_struct *task);
47#else
48 static inline int rt_mutex_debug_check_no_locks_freed(const void *from,
49 unsigned long len)
50 {
51 return 0;
52 }
53# define rt_mutex_debug_check_no_locks_held(task) do { } while (0)
54#endif
55
56#ifdef CONFIG_DEBUG_RT_MUTEXES
57# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
58 , .name = #mutexname, .file = __FILE__, .line = __LINE__
59# define rt_mutex_init(mutex) __rt_mutex_init(mutex, __func__)
60 extern void rt_mutex_debug_task_free(struct task_struct *tsk);
61#else
62# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
63# define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL)
64# define rt_mutex_debug_task_free(t) do { } while (0)
65#endif
66
67#define __RT_MUTEX_INITIALIZER(mutexname) \
68 { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
69 , .wait_list = PLIST_HEAD_INIT(mutexname.wait_list) \
70 , .owner = NULL \
71 __DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
72
73#define DEFINE_RT_MUTEX(mutexname) \
74 struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
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82static inline int rt_mutex_is_locked(struct rt_mutex *lock)
83{
84 return lock->owner != NULL;
85}
86
87extern void __rt_mutex_init(struct rt_mutex *lock, const char *name);
88extern void rt_mutex_destroy(struct rt_mutex *lock);
89
90extern void rt_mutex_lock(struct rt_mutex *lock);
91extern int rt_mutex_lock_interruptible(struct rt_mutex *lock,
92 int detect_deadlock);
93extern int rt_mutex_timed_lock(struct rt_mutex *lock,
94 struct hrtimer_sleeper *timeout,
95 int detect_deadlock);
96
97extern int rt_mutex_trylock(struct rt_mutex *lock);
98
99extern void rt_mutex_unlock(struct rt_mutex *lock);
100
101#ifdef CONFIG_RT_MUTEXES
102# define INIT_RT_MUTEXES(tsk) \
103 .pi_waiters = PLIST_HEAD_INIT(tsk.pi_waiters), \
104 INIT_RT_MUTEX_DEBUG(tsk)
105#else
106# define INIT_RT_MUTEXES(tsk)
107#endif
108
109#endif
110