| /* |
| * 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 <mingo@redhat.com> |
| * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com> |
| * |
| * 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 |