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| author | Thomas Gleixner <tglx@linutronix.de> | 2021-08-15 23:28:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-08-17 17:04:35 +0200 |
| commit | 6bc8996add9f82d0153b0be44efe282bd45dc702 (patch) | |
| tree | 086acd6d4d75f32ddd0dbf5212b0462a447351af /include/linux/rtmutex.h | |
| parent | ebbdc41e90ffce8b6bb3cbba1801ede2dd07a89b (diff) | |
| download | linux-6bc8996add9f82d0153b0be44efe282bd45dc702.tar.gz linux-6bc8996add9f82d0153b0be44efe282bd45dc702.tar.bz2 linux-6bc8996add9f82d0153b0be44efe282bd45dc702.zip | |
locking/rtmutex: Provide rt_mutex_base_is_locked()
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
Diffstat (limited to 'include/linux/rtmutex.h')
| -rw-r--r-- | include/linux/rtmutex.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h index 852740285d71..174419ee58e9 100644 --- a/include/linux/rtmutex.h +++ b/include/linux/rtmutex.h @@ -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); /** |