rwlock_types.h

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#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 */