forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
2.8 KiB
101 lines
2.8 KiB
/* |
|
* RT Mutexes: blocking mutual exclusion locks with PI support |
|
* |
|
* started by Ingo Molnar and Thomas Gleixner: |
|
* |
|
* Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <[email protected]> |
|
* Copyright (C) 2006, Timesys Corp., Thomas Gleixner <[email protected]> |
|
* |
|
* This file contains the public data structure and API definitions. |
|
*/ |
|
|
|
#ifndef __LINUX_RT_MUTEX_H |
|
#define __LINUX_RT_MUTEX_H |
|
|
|
#include <linux/linkage.h> |
|
#include <linux/rbtree.h> |
|
#include <linux/spinlock_types.h> |
|
|
|
extern int max_lock_depth; /* for sysctl */ |
|
|
|
/** |
|
* The rt_mutex structure |
|
* |
|
* @wait_lock: spinlock to protect the structure |
|
* @waiters: rbtree root to enqueue waiters in priority order |
|
* @waiters_leftmost: top waiter |
|
* @owner: the mutex owner |
|
*/ |
|
struct rt_mutex { |
|
raw_spinlock_t wait_lock; |
|
struct rb_root waiters; |
|
struct rb_node *waiters_leftmost; |
|
struct task_struct *owner; |
|
#ifdef CONFIG_DEBUG_RT_MUTEXES |
|
int save_state; |
|
const char *name, *file; |
|
int line; |
|
void *magic; |
|
#endif |
|
}; |
|
|
|
struct rt_mutex_waiter; |
|
struct hrtimer_sleeper; |
|
|
|
#ifdef CONFIG_DEBUG_RT_MUTEXES |
|
extern int rt_mutex_debug_check_no_locks_freed(const void *from, |
|
unsigned long len); |
|
extern void rt_mutex_debug_check_no_locks_held(struct task_struct *task); |
|
#else |
|
static inline int rt_mutex_debug_check_no_locks_freed(const void *from, |
|
unsigned long len) |
|
{ |
|
return 0; |
|
} |
|
# define rt_mutex_debug_check_no_locks_held(task) do { } while (0) |
|
#endif |
|
|
|
#ifdef CONFIG_DEBUG_RT_MUTEXES |
|
# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \ |
|
, .name = #mutexname, .file = __FILE__, .line = __LINE__ |
|
# define rt_mutex_init(mutex) __rt_mutex_init(mutex, __func__) |
|
extern void rt_mutex_debug_task_free(struct task_struct *tsk); |
|
#else |
|
# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) |
|
# define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL) |
|
# define rt_mutex_debug_task_free(t) do { } while (0) |
|
#endif |
|
|
|
#define __RT_MUTEX_INITIALIZER(mutexname) \ |
|
{ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \ |
|
, .waiters = RB_ROOT \ |
|
, .owner = NULL \ |
|
__DEBUG_RT_MUTEX_INITIALIZER(mutexname)} |
|
|
|
#define DEFINE_RT_MUTEX(mutexname) \ |
|
struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname) |
|
|
|
/** |
|
* rt_mutex_is_locked - is the mutex locked |
|
* @lock: the mutex to be queried |
|
* |
|
* Returns 1 if the mutex is locked, 0 if unlocked. |
|
*/ |
|
static inline int rt_mutex_is_locked(struct rt_mutex *lock) |
|
{ |
|
return lock->owner != NULL; |
|
} |
|
|
|
extern void __rt_mutex_init(struct rt_mutex *lock, const char *name); |
|
extern void rt_mutex_destroy(struct rt_mutex *lock); |
|
|
|
extern void rt_mutex_lock(struct rt_mutex *lock); |
|
extern int rt_mutex_lock_interruptible(struct rt_mutex *lock); |
|
extern int rt_mutex_timed_lock(struct rt_mutex *lock, |
|
struct hrtimer_sleeper *timeout); |
|
|
|
extern int rt_mutex_trylock(struct rt_mutex *lock); |
|
|
|
extern void rt_mutex_unlock(struct rt_mutex *lock); |
|
|
|
#endif
|
|
|