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125 lines
3.5 KiB
125 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* RT Mutexes: blocking mutual exclusion locks with PI support |
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* |
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* started by Ingo Molnar and Thomas Gleixner: |
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* |
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* Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <[email protected]> |
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* Copyright (C) 2006, Timesys Corp., Thomas Gleixner <[email protected]> |
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* |
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* This file contains the public data structure and API definitions. |
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*/ |
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#ifndef __LINUX_RT_MUTEX_H |
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#define __LINUX_RT_MUTEX_H |
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#include <linux/linkage.h> |
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#include <linux/rbtree.h> |
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#include <linux/spinlock_types.h> |
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extern int max_lock_depth; /* for sysctl */ |
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/** |
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* The rt_mutex structure |
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* |
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* @wait_lock: spinlock to protect the structure |
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* @waiters: rbtree root to enqueue waiters in priority order; |
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* caches top-waiter (leftmost node). |
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* @owner: the mutex owner |
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*/ |
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struct rt_mutex { |
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raw_spinlock_t wait_lock; |
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struct rb_root_cached waiters; |
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struct task_struct *owner; |
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#ifdef CONFIG_DEBUG_RT_MUTEXES |
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int save_state; |
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const char *name, *file; |
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int line; |
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void *magic; |
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#endif |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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struct lockdep_map dep_map; |
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#endif |
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}; |
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struct rt_mutex_waiter; |
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struct hrtimer_sleeper; |
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#ifdef CONFIG_DEBUG_RT_MUTEXES |
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extern int rt_mutex_debug_check_no_locks_freed(const void *from, |
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unsigned long len); |
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extern void rt_mutex_debug_check_no_locks_held(struct task_struct *task); |
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#else |
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static inline int rt_mutex_debug_check_no_locks_freed(const void *from, |
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unsigned long len) |
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{ |
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return 0; |
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} |
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# define rt_mutex_debug_check_no_locks_held(task) do { } while (0) |
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#endif |
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#ifdef CONFIG_DEBUG_RT_MUTEXES |
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# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \ |
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, .name = #mutexname, .file = __FILE__, .line = __LINE__ |
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# define rt_mutex_init(mutex) \ |
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do { \ |
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static struct lock_class_key __key; \ |
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__rt_mutex_init(mutex, __func__, &__key); \ |
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} while (0) |
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extern void rt_mutex_debug_task_free(struct task_struct *tsk); |
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#else |
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# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) |
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# define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL, NULL) |
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# define rt_mutex_debug_task_free(t) do { } while (0) |
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#endif |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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#define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname) \ |
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, .dep_map = { .name = #mutexname } |
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#else |
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#define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname) |
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#endif |
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#define __RT_MUTEX_INITIALIZER(mutexname) \ |
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{ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \ |
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, .waiters = RB_ROOT_CACHED \ |
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, .owner = NULL \ |
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__DEBUG_RT_MUTEX_INITIALIZER(mutexname) \ |
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__DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)} |
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#define DEFINE_RT_MUTEX(mutexname) \ |
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struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname) |
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/** |
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* rt_mutex_is_locked - is the mutex locked |
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* @lock: the mutex to be queried |
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* |
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* Returns 1 if the mutex is locked, 0 if unlocked. |
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*/ |
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static inline int rt_mutex_is_locked(struct rt_mutex *lock) |
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{ |
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return lock->owner != NULL; |
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} |
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extern void __rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key); |
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extern void rt_mutex_destroy(struct rt_mutex *lock); |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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extern void rt_mutex_lock_nested(struct rt_mutex *lock, unsigned int subclass); |
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#define rt_mutex_lock(lock) rt_mutex_lock_nested(lock, 0) |
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#else |
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extern void rt_mutex_lock(struct rt_mutex *lock); |
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#define rt_mutex_lock_nested(lock, subclass) rt_mutex_lock(lock) |
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#endif |
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extern int rt_mutex_lock_interruptible(struct rt_mutex *lock); |
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extern int rt_mutex_timed_lock(struct rt_mutex *lock, |
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struct hrtimer_sleeper *timeout); |
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extern int rt_mutex_trylock(struct rt_mutex *lock); |
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extern void rt_mutex_unlock(struct rt_mutex *lock); |
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#endif
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