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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 | extern int max_lock_depth; /* for sysctl */ |
20 | |
21 | /** |
22 | * The rt_mutex structure |
23 | * |
24 | * @wait_lock: spinlock to protect the structure |
25 | * @wait_list: pilist head to enqueue waiters in priority order |
26 | * @owner: the mutex owner |
27 | */ |
28 | struct 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 | |
40 | struct rt_mutex_waiter; |
41 | struct 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) |
75 | |
76 | /** |
77 | * rt_mutex_is_locked - is the mutex locked |
78 | * @lock: the mutex to be queried |
79 | * |
80 | * Returns 1 if the mutex is locked, 0 if unlocked. |
81 | */ |
82 | static inline int rt_mutex_is_locked(struct rt_mutex *lock) |
83 | { |
84 | return lock->owner != NULL; |
85 | } |
86 | |
87 | extern void __rt_mutex_init(struct rt_mutex *lock, const char *name); |
88 | extern void rt_mutex_destroy(struct rt_mutex *lock); |
89 | |
90 | extern void rt_mutex_lock(struct rt_mutex *lock); |
91 | extern int rt_mutex_lock_interruptible(struct rt_mutex *lock, |
92 | int detect_deadlock); |
93 | extern int rt_mutex_timed_lock(struct rt_mutex *lock, |
94 | struct hrtimer_sleeper *timeout, |
95 | int detect_deadlock); |
96 | |
97 | extern int rt_mutex_trylock(struct rt_mutex *lock); |
98 | |
99 | extern 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 |
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