Release 4.12 include/linux/rwlock_types.h

#ifndef __LINUX_RWLOCK_TYPES_H

#define __LINUX_RWLOCK_TYPES_H

/*
 * include/linux/rwlock_types.h - generic rwlock type definitions
 *                                and initializers
 *
 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
 * Released under the General Public License (GPL).
 */
typedef struct {
	
arch_rwlock_t raw_lock;
#ifdef CONFIG_GENERIC_LOCKBREAK
	
unsigned int break_lock;
#endif
#ifdef CONFIG_DEBUG_SPINLOCK
	

unsigned int magic, owner_cpu;
	
void *owner;
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	
struct lockdep_map dep_map;
#endif

} rwlock_t;


#define RWLOCK_MAGIC		0xdeaf1eed

#ifdef CONFIG_DEBUG_LOCK_ALLOC

# define RW_DEP_MAP_INIT(lockname)	.dep_map = { .name = #lockname }
#else

# define RW_DEP_MAP_INIT(lockname)
#endif

#ifdef CONFIG_DEBUG_SPINLOCK

#define __RW_LOCK_UNLOCKED(lockname)					\
	(rwlock_t)      {       .raw_lock = __ARCH_RW_LOCK_UNLOCKED,    \
                                .magic = RWLOCK_MAGIC,                  \
                                .owner = SPINLOCK_OWNER_INIT,           \
                                .owner_cpu = -1,                        \
                                RW_DEP_MAP_INIT(lockname) }
#else

#define __RW_LOCK_UNLOCKED(lockname) \
	(rwlock_t)      {       .raw_lock = __ARCH_RW_LOCK_UNLOCKED,    \
                                RW_DEP_MAP_INIT(lockname) }
#endif


#define DEFINE_RWLOCK(x)	rwlock_t x = __RW_LOCK_UNLOCKED(x)

#endif /* __LINUX_RWLOCK_TYPES_H */
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