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#ifndef __LINUX_RWLOCK_TYPES_RT_H
#define __LINUX_RWLOCK_TYPES_RT_H
#ifndef __LINUX_SPINLOCK_TYPES_H
#error "Do not include directly. Include spinlock_types.h instead"
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
#else
# define RW_DEP_MAP_INIT(lockname)
#endif
typedef struct rt_rw_lock rwlock_t;
#define __RW_LOCK_UNLOCKED(name) __RWLOCK_RT_INITIALIZER(name)
#define DEFINE_RWLOCK(name) \
rwlock_t name = __RW_LOCK_UNLOCKED(name)
/*
* A reader biased implementation primarily for CPU pinning.
*
* Can be selected as general replacement for the single reader RT rwlock
* variant
*/
struct rt_rw_lock {
struct rt_mutex rtmutex;
atomic_t readers;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
#endif
};
#define READER_BIAS (1U << 31)
#define WRITER_BIAS (1U << 30)
#define __RWLOCK_RT_INITIALIZER(name) \
{ \
.readers = ATOMIC_INIT(READER_BIAS), \
.rtmutex = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.rtmutex), \
RW_DEP_MAP_INIT(name) \
}
void __rwlock_biased_rt_init(struct rt_rw_lock *lock, const char *name,
struct lock_class_key *key);
#define rwlock_biased_rt_init(rwlock) \
do { \
static struct lock_class_key __key; \
\
__rwlock_biased_rt_init((rwlock), #rwlock, &__key); \
} while (0)
#endif
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