108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
|
/*
|
||
|
|
* 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/plist.h>
|
||
|
|
#include <linux/spinlock_types.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The rt_mutex structure
|
||
|
|
*
|
||
|
|
* @wait_lock: spinlock to protect the structure
|
||
|
|
* @wait_list: pilist head to enqueue waiters in priority order
|
||
|
|
* @owner: the mutex owner
|
||
|
|
*/
|
||
|
|
struct rt_mutex {
|
||
|
|
spinlock_t wait_lock;
|
||
|
|
struct plist_head wait_list;
|
||
|
|
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 = __SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
|
||
|
|
, .wait_list = PLIST_HEAD_INIT(mutexname.wait_list, mutexname.wait_lock) \
|
||
|
|
, .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,
|
||
|
|
int detect_deadlock);
|
||
|
|
extern int rt_mutex_timed_lock(struct rt_mutex *lock,
|
||
|
|
struct hrtimer_sleeper *timeout,
|
||
|
|
int detect_deadlock);
|
||
|
|
|
||
|
|
extern int rt_mutex_trylock(struct rt_mutex *lock);
|
||
|
|
|
||
|
|
extern void rt_mutex_unlock(struct rt_mutex *lock);
|
||
|
|
|
||
|
|
#ifdef CONFIG_RT_MUTEXES
|
||
|
|
# define INIT_RT_MUTEXES(tsk) \
|
||
|
|
.pi_waiters = PLIST_HEAD_INIT(tsk.pi_waiters, tsk.pi_lock), \
|
||
|
|
INIT_RT_MUTEX_DEBUG(tsk)
|
||
|
|
#else
|
||
|
|
# define INIT_RT_MUTEXES(tsk)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|