include/linux/rwlock_types.h

   1 #ifndef __LINUX_RWLOCK_TYPES_H
   2 #define __LINUX_RWLOCK_TYPES_H
   3
   4 #if !defined(__LINUX_SPINLOCK_TYPES_H)
   5 # error "Do not include directly, include spinlock_types.h"
   6 #endif
   7
   8 #ifdef CONFIG_DEBUG_LOCK_ALLOC
   9 # define RW_DEP_MAP_INIT(lockname)                                      \
  10         .dep_map = {                                                    \
  11                 .name = #lockname,                                      \
  12                 .wait_type_inner = LD_WAIT_CONFIG,                      \
  13         }
  14 #else
  15 # define RW_DEP_MAP_INIT(lockname)
  16 #endif
  17
  18 #ifndef CONFIG_PREEMPT_RT
  19 /*
  20  * generic rwlock type definitions and initializers
  21  *
  22  * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
  23  * Released under the General Public License (GPL).
  24  */
  25 typedef struct {
  26         arch_rwlock_t raw_lock;
  27 #ifdef CONFIG_DEBUG_SPINLOCK
  28         unsigned int magic, owner_cpu;
  29         void *owner;
  30 #endif
  31 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  32         struct lockdep_map dep_map;
  33 #endif
  34 } rwlock_t;
  35
  36 #define RWLOCK_MAGIC            0xdeaf1eed
  37
  38 #ifdef CONFIG_DEBUG_SPINLOCK
  39 #define __RW_LOCK_UNLOCKED(lockname)                                    \
  40         (rwlock_t)      {       .raw_lock = __ARCH_RW_LOCK_UNLOCKED,    \
  41                                 .magic = RWLOCK_MAGIC,                  \
  42                                 .owner = SPINLOCK_OWNER_INIT,           \
  43                                 .owner_cpu = -1,                        \
  44                                 RW_DEP_MAP_INIT(lockname) }
  45 #else
  46 #define __RW_LOCK_UNLOCKED(lockname) \
  47         (rwlock_t)      {       .raw_lock = __ARCH_RW_LOCK_UNLOCKED,    \
  48                                 RW_DEP_MAP_INIT(lockname) }
  49 #endif
  50
  51 #define DEFINE_RWLOCK(x)        rwlock_t x = __RW_LOCK_UNLOCKED(x)
  52
  53 #else /* !CONFIG_PREEMPT_RT */
  54
  55 #include <linux/rwbase_rt.h>
  56
  57 typedef struct {
  58         struct rwbase_rt        rwbase;
  59         atomic_t                readers;
  60 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  61         struct lockdep_map      dep_map;
  62 #endif
  63 } rwlock_t;
  64
  65 #define __RWLOCK_RT_INITIALIZER(name)                                   \
  66 {                                                                       \
  67         .rwbase = __RWBASE_INITIALIZER(name),                           \
  68         RW_DEP_MAP_INIT(name)                                           \
  69 }
  70
  71 #define __RW_LOCK_UNLOCKED(name) __RWLOCK_RT_INITIALIZER(name)
  72
  73 #define DEFINE_RWLOCK(name)                                             \
  74         rwlock_t name = __RW_LOCK_UNLOCKED(name)
  75
  76 #endif /* CONFIG_PREEMPT_RT */
  77
  78 #endif /* __LINUX_RWLOCK_TYPES_H */