LXR linux/include/linux/spinlock

   1#ifndef __LINUX_SPINLOCK_TYPES_H
   2#define __LINUX_SPINLOCK_TYPES_H
   3
   4/*
   5 * include/linux/spinlock_types.h - generic spinlock type definitions
   6 *                                  and initializers
   7 *
   8 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
   9 * Released under the General Public License (GPL).
  10 */
  11
  12#include <linux/spinlock_types_raw.h>
  13
  14#ifndef CONFIG_PREEMPT_RT
  15
  16/* Non PREEMPT_RT kernels map spinlock to raw_spinlock */
  17typedef struct spinlock {
  18        union {
  19                struct raw_spinlock rlock;
  20
  21#ifdef CONFIG_DEBUG_LOCK_ALLOC
  22# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
  23                struct {
  24                        u8 __padding[LOCK_PADSIZE];
  25                        struct lockdep_map dep_map;
  26                };
  27#endif
  28        };
  29} spinlock_t;
  30
  31#define ___SPIN_LOCK_INITIALIZER(lockname)      \
  32        {                                       \
  33        .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
  34        SPIN_DEBUG_INIT(lockname)               \
  35        SPIN_DEP_MAP_INIT(lockname) }
  36
  37#define __SPIN_LOCK_INITIALIZER(lockname) \
  38        { { .rlock = ___SPIN_LOCK_INITIALIZER(lockname) } }
  39
  40#define __SPIN_LOCK_UNLOCKED(lockname) \
  41        (spinlock_t) __SPIN_LOCK_INITIALIZER(lockname)
  42
  43#define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
  44
  45#else /* !CONFIG_PREEMPT_RT */
  46
  47/* PREEMPT_RT kernels map spinlock to rt_mutex */
  48#include <linux/rtmutex.h>
  49
  50typedef struct spinlock {
  51        struct rt_mutex_base    lock;
  52#ifdef CONFIG_DEBUG_LOCK_ALLOC
  53        struct lockdep_map      dep_map;
  54#endif
  55} spinlock_t;
  56
  57#define __SPIN_LOCK_UNLOCKED(name)                              \
  58        {                                                       \
  59                .lock = __RT_MUTEX_BASE_INITIALIZER(name.lock), \
  60                SPIN_DEP_MAP_INIT(name)                         \
  61        }
  62
  63#define __LOCAL_SPIN_LOCK_UNLOCKED(name)                        \
  64        {                                                       \
  65                .lock = __RT_MUTEX_BASE_INITIALIZER(name.lock), \
  66                LOCAL_SPIN_DEP_MAP_INIT(name)                   \
  67        }
  68
  69#define DEFINE_SPINLOCK(name)                                   \
  70        spinlock_t name = __SPIN_LOCK_UNLOCKED(name)
  71
  72#endif /* CONFIG_PREEMPT_RT */
  73
  74#include <linux/rwlock_types.h>
  75
  76#endif /* __LINUX_SPINLOCK_TYPES_H */
  77