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23f78d4a IM |
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 | spinlock_t wait_lock; | |
28 | struct plist_head wait_list; | |
29 | struct task_struct *owner; | |
30 | #ifdef CONFIG_DEBUG_RT_MUTEXES | |
31 | int save_state; | |
32 | struct list_head held_list_entry; | |
33 | unsigned long acquire_ip; | |
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 | # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \ | |
45 | , .name = #mutexname, .file = __FILE__, .line = __LINE__ | |
46 | # define rt_mutex_init(mutex) __rt_mutex_init(mutex, __FUNCTION__) | |
47 | extern void rt_mutex_debug_task_free(struct task_struct *tsk); | |
48 | #else | |
49 | # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) | |
50 | # define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL) | |
51 | # define rt_mutex_debug_task_free(t) do { } while (0) | |
52 | #endif | |
53 | ||
54 | #define __RT_MUTEX_INITIALIZER(mutexname) \ | |
55 | { .wait_lock = SPIN_LOCK_UNLOCKED \ | |
56 | , .wait_list = PLIST_HEAD_INIT(mutexname.wait_list, mutexname.wait_lock) \ | |
57 | , .owner = NULL \ | |
58 | __DEBUG_RT_MUTEX_INITIALIZER(mutexname)} | |
59 | ||
60 | #define DEFINE_RT_MUTEX(mutexname) \ | |
61 | struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname) | |
62 | ||
63 | /*** | |
64 | * rt_mutex_is_locked - is the mutex locked | |
65 | * @lock: the mutex to be queried | |
66 | * | |
67 | * Returns 1 if the mutex is locked, 0 if unlocked. | |
68 | */ | |
69 | static inline int rt_mutex_is_locked(struct rt_mutex *lock) | |
70 | { | |
71 | return lock->owner != NULL; | |
72 | } | |
73 | ||
74 | extern void __rt_mutex_init(struct rt_mutex *lock, const char *name); | |
75 | extern void rt_mutex_destroy(struct rt_mutex *lock); | |
76 | ||
77 | extern void rt_mutex_lock(struct rt_mutex *lock); | |
78 | extern int rt_mutex_lock_interruptible(struct rt_mutex *lock, | |
79 | int detect_deadlock); | |
80 | extern int rt_mutex_timed_lock(struct rt_mutex *lock, | |
81 | struct hrtimer_sleeper *timeout, | |
82 | int detect_deadlock); | |
83 | ||
84 | extern int rt_mutex_trylock(struct rt_mutex *lock); | |
85 | ||
86 | extern void rt_mutex_unlock(struct rt_mutex *lock); | |
87 | ||
88 | #ifdef CONFIG_DEBUG_RT_MUTEXES | |
89 | # define INIT_RT_MUTEX_DEBUG(tsk) \ | |
90 | .held_list_head = LIST_HEAD_INIT(tsk.held_list_head), \ | |
91 | .held_list_lock = SPIN_LOCK_UNLOCKED | |
92 | #else | |
93 | # define INIT_RT_MUTEX_DEBUG(tsk) | |
94 | #endif | |
95 | ||
96 | #ifdef CONFIG_RT_MUTEXES | |
97 | # define INIT_RT_MUTEXES(tsk) \ | |
98 | .pi_waiters = PLIST_HEAD_INIT(tsk.pi_waiters, tsk.pi_lock), \ | |
99 | INIT_RT_MUTEX_DEBUG(tsk) | |
100 | #else | |
101 | # define INIT_RT_MUTEXES(tsk) | |
102 | #endif | |
103 | ||
104 | #endif |