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[PATCH] pi-futex: rt mutex core
Core functions for the rt-mutex subsystem. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar
committed by
Linus Torvalds
Linus Torvalds
parent
b29739f902
commit
23f78d4a03
@@ -124,6 +124,7 @@ extern struct group_info init_groups;
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.cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \
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.fs_excl = ATOMIC_INIT(0), \
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.pi_lock = SPIN_LOCK_UNLOCKED, \
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INIT_RT_MUTEXES(tsk) \
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}
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@@ -0,0 +1,104 @@
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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 <mingo@redhat.com>
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* Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
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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/plist.h>
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#include <linux/spinlock_types.h>
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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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* @wait_list: pilist head to enqueue waiters in priority order
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* @owner: the mutex owner
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*/
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struct rt_mutex {
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spinlock_t wait_lock;
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struct plist_head wait_list;
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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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struct list_head held_list_entry;
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unsigned long acquire_ip;
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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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};
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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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# 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) __rt_mutex_init(mutex, __FUNCTION__)
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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)
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# define rt_mutex_debug_task_free(t) do { } while (0)
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#endif
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#define __RT_MUTEX_INITIALIZER(mutexname) \
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{ .wait_lock = SPIN_LOCK_UNLOCKED \
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, .wait_list = PLIST_HEAD_INIT(mutexname.wait_list, mutexname.wait_lock) \
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, .owner = NULL \
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__DEBUG_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);
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extern void rt_mutex_destroy(struct rt_mutex *lock);
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extern void rt_mutex_lock(struct rt_mutex *lock);
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extern int rt_mutex_lock_interruptible(struct rt_mutex *lock,
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int detect_deadlock);
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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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int detect_deadlock);
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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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#ifdef CONFIG_DEBUG_RT_MUTEXES
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# define INIT_RT_MUTEX_DEBUG(tsk) \
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.held_list_head = LIST_HEAD_INIT(tsk.held_list_head), \
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.held_list_lock = SPIN_LOCK_UNLOCKED
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#else
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# define INIT_RT_MUTEX_DEBUG(tsk)
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#endif
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#ifdef CONFIG_RT_MUTEXES
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# define INIT_RT_MUTEXES(tsk) \
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.pi_waiters = PLIST_HEAD_INIT(tsk.pi_waiters, tsk.pi_lock), \
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INIT_RT_MUTEX_DEBUG(tsk)
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#else
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# define INIT_RT_MUTEXES(tsk)
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#endif
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#endif
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@@ -73,6 +73,7 @@ struct sched_param {
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#include <linux/seccomp.h>
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#include <linux/rcupdate.h>
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#include <linux/futex.h>
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#include <linux/rtmutex.h>
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#include <linux/time.h>
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#include <linux/param.h>
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@@ -858,6 +859,17 @@ struct task_struct {
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/* Protection of the PI data structures: */
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spinlock_t pi_lock;
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#ifdef CONFIG_RT_MUTEXES
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/* PI waiters blocked on a rt_mutex held by this task */
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struct plist_head pi_waiters;
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/* Deadlock detection and priority inheritance handling */
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struct rt_mutex_waiter *pi_blocked_on;
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# ifdef CONFIG_DEBUG_RT_MUTEXES
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spinlock_t held_list_lock;
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struct list_head held_list_head;
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# endif
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#endif
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#ifdef CONFIG_DEBUG_MUTEXES
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/* mutex deadlock detection */
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struct mutex_waiter *blocked_on;
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@@ -149,6 +149,7 @@ enum
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KERN_ACPI_VIDEO_FLAGS=71, /* int: flags for setting up video after ACPI sleep */
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KERN_IA64_UNALIGNED=72, /* int: ia64 unaligned userland trap enable */
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KERN_COMPAT_LOG=73, /* int: print compat layer messages */
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KERN_MAX_LOCK_DEPTH=74,
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};
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