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locking/rtmutex: Provide rt_mutex_base_is_locked()

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Provide rt_mutex_base_is_locked(), which will be used for various wrapped
locking primitives for RT.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211302.899572818@linutronix.de
This commit is contained in:
Thomas Gleixner
2021-08-15 23:28:02 +02:00
committed by Ingo Molnar
parent ebbdc41e90
commit 6bc8996add
1 changed files with 12 additions and 0 deletions
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12
include/linux/rtmutex.h
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@@ -13,6 +13,7 @@
#ifndef __LINUX_RT_MUTEX_H
#define __LINUX_RT_MUTEX_H
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <linux/rbtree.h>
#include <linux/spinlock_types.h>
@@ -32,6 +33,17 @@ struct rt_mutex_base {
.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 READ_ONCE(lock->owner) != NULL;
}
extern void rt_mutex_base_init(struct rt_mutex_base *rtb);
/**