root/include/linux/rwlock_types.h

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INCLUDED FROM

#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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