include/linux/rtmutex.h

Source file repositories/reference/linux-study-clean/include/linux/rtmutex.h

File Facts

System
Linux kernel
Corpus path
include/linux/rtmutex.h
Extension
.h
Size
3972 bytes
Lines
141
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rt_mutex_base {
	raw_spinlock_t		wait_lock;
	struct rb_root_cached   waiters __guarded_by(&wait_lock);
	struct task_struct	*owner  __guarded_by(&wait_lock);
};

#define __RT_MUTEX_BASE_INITIALIZER(rtbasename)				\
{									\
	.wait_lock = __RAW_SPIN_LOCK_UNLOCKED(rtbasename.wait_lock),	\
	.waiters = RB_ROOT_CACHED,					\
	.owner = NULL							\
}

/**
 * rt_mutex_base_is_locked - is the rtmutex locked
 * @lock: the mutex to be queried
 *
 * Returns true if the mutex is locked, false if unlocked.
 */
static inline bool rt_mutex_base_is_locked(struct rt_mutex_base *lock)
{
	return data_race(READ_ONCE(lock->owner) != NULL);
}

#ifdef CONFIG_RT_MUTEXES
#define RT_MUTEX_HAS_WAITERS	1UL

static inline struct task_struct *rt_mutex_owner(struct rt_mutex_base *lock)
{
	unsigned long owner = (unsigned long) data_race(READ_ONCE(lock->owner));

	return (struct task_struct *) (owner & ~RT_MUTEX_HAS_WAITERS);
}
#endif
extern void rt_mutex_base_init(struct rt_mutex_base *rtb);

context_lock_struct(rt_mutex);

/**
 * The rt_mutex structure
 *
 * @wait_lock:	spinlock to protect the structure
 * @waiters:	rbtree root to enqueue waiters in priority order;
 *              caches top-waiter (leftmost node).
 * @owner:	the mutex owner
 */
struct rt_mutex {
	struct rt_mutex_base	rtmutex;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	struct lockdep_map	dep_map;
#endif
};

struct rt_mutex_waiter;
struct hrtimer_sleeper;

#ifdef CONFIG_DEBUG_RT_MUTEXES
extern void rt_mutex_debug_task_free(struct task_struct *tsk);
#else
static inline void rt_mutex_debug_task_free(struct task_struct *tsk) { }
#endif

#define rt_mutex_init(mutex) \
do { \
	static struct lock_class_key __key; \
	__rt_mutex_init(mutex, __func__, &__key); \
} while (0)

#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)	\
	.dep_map = {					\
		.name = #mutexname,			\
		.wait_type_inner = LD_WAIT_SLEEP,	\
	}
#else
#define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)
#endif

#define __RT_MUTEX_INITIALIZER(mutexname)				\
{									\
	.rtmutex = __RT_MUTEX_BASE_INITIALIZER(mutexname.rtmutex),	\
	__DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)			\
}

#define DEFINE_RT_MUTEX(mutexname) \
	struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)

extern void __rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key);

#ifdef CONFIG_DEBUG_LOCK_ALLOC

Annotation

Implementation Notes