root/include/linux/spinlock_types.h

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INCLUDED FROM

#ifndef __LINUX_SPINLOCK_TYPES_H
#define __LINUX_SPINLOCK_TYPES_H

/*
 * include/linux/spinlock_types.h - generic spinlock type definitions
 *                                  and initializers
 *
 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
 * Released under the General Public License (GPL).
 */

#if defined(CONFIG_SMP)
# include <asm/spinlock_types.h>
#else
# include <linux/spinlock_types_up.h>
#endif

#include <linux/lockdep.h>

typedef struct raw_spinlock {
        arch_spinlock_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
} raw_spinlock_t;

#define SPINLOCK_MAGIC          0xdead4ead

#define SPINLOCK_OWNER_INIT     ((void *)-1L)

#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define SPIN_DEP_MAP_INIT(lockname)    .dep_map = { .name = #lockname }
#else
# define SPIN_DEP_MAP_INIT(lockname)
#endif

#ifdef CONFIG_DEBUG_SPINLOCK
# define SPIN_DEBUG_INIT(lockname)              \
        .magic = SPINLOCK_MAGIC,                \
        .owner_cpu = -1,                        \
        .owner = SPINLOCK_OWNER_INIT,
#else
# define SPIN_DEBUG_INIT(lockname)
#endif

#define __RAW_SPIN_LOCK_INITIALIZER(lockname)   \
        {                                       \
        .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
        SPIN_DEBUG_INIT(lockname)               \
        SPIN_DEP_MAP_INIT(lockname) }

#define __RAW_SPIN_LOCK_UNLOCKED(lockname)      \
        (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)

#define DEFINE_RAW_SPINLOCK(x)  raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)

typedef struct spinlock {
        union {
                struct raw_spinlock rlock;

#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
                struct {
                        u8 __padding[LOCK_PADSIZE];
                        struct lockdep_map dep_map;
                };
#endif
        };
} spinlock_t;

#define __SPIN_LOCK_INITIALIZER(lockname) \
        { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }

#define __SPIN_LOCK_UNLOCKED(lockname) \
        (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)

#define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)

#include <linux/rwlock_types.h>

#endif /* __LINUX_SPINLOCK_TYPES_H */
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