diff options
Diffstat (limited to 'include/linux/rwsem.h')
| -rw-r--r-- | include/linux/rwsem.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h index c8b543d428b0..f1aaf676a874 100644 --- a/include/linux/rwsem.h +++ b/include/linux/rwsem.h @@ -132,6 +132,18 @@ static inline int rwsem_is_contended(struct rw_semaphore *sem) return !list_empty(&sem->wait_list); } +#if defined(CONFIG_DEBUG_RWSEMS) || defined(CONFIG_DETECT_HUNG_TASK_BLOCKER) +/* + * Return just the real task structure pointer of the owner + */ +extern struct task_struct *rwsem_owner(struct rw_semaphore *sem); + +/* + * Return true if the rwsem is owned by a reader. + */ +extern bool is_rwsem_reader_owned(struct rw_semaphore *sem); +#endif + #else /* !CONFIG_PREEMPT_RT */ #include <linux/rwbase_rt.h> @@ -240,10 +252,11 @@ extern void up_write(struct rw_semaphore *sem); DEFINE_GUARD(rwsem_read, struct rw_semaphore *, down_read(_T), up_read(_T)) DEFINE_GUARD_COND(rwsem_read, _try, down_read_trylock(_T)) -DEFINE_GUARD_COND(rwsem_read, _intr, down_read_interruptible(_T) == 0) +DEFINE_GUARD_COND(rwsem_read, _intr, down_read_interruptible(_T), _RET == 0) DEFINE_GUARD(rwsem_write, struct rw_semaphore *, down_write(_T), up_write(_T)) DEFINE_GUARD_COND(rwsem_write, _try, down_write_trylock(_T)) +DEFINE_GUARD_COND(rwsem_write, _kill, down_write_killable(_T), _RET == 0) /* * downgrade write lock to read lock |