include/sys/mutex.h

   1 #ifndef _SPL_MUTEX_H
   2 #define _SPL_MUTEX_H
   3
   4 #ifdef  __cplusplus
   5 extern "C" {
   6 #endif
   7
   8 #include <linux/module.h>
   9 #include <linux/hardirq.h>
  10 #include <sys/types.h>
  11 #include <sys/kmem.h>
  12
  13 //#define DEBUG_MUTEX
  14 #undef DEBUG_MUTEX
  15
  16 #define MUTEX_DEFAULT           0
  17 #define MUTEX_SPIN              1
  18 #define MUTEX_ADAPTIVE          2
  19
  20 #define MUTEX_ENTER_TOTAL       0
  21 #define MUTEX_ENTER_NOT_HELD    1
  22 #define MUTEX_ENTER_SPIN        2
  23 #define MUTEX_ENTER_SLEEP       3
  24 #define MUTEX_TRYENTER_TOTAL    4
  25 #define MUTEX_TRYENTER_NOT_HELD 5
  26 #define MUTEX_STATS_SIZE        6
  27
  28 #define KM_MAGIC                0x42424242
  29 #define KM_POISON               0x84
  30
  31 typedef struct {
  32         int32_t km_magic;
  33         int16_t km_type;
  34         int16_t km_name_size;
  35         char *km_name;
  36         struct task_struct *km_owner;
  37         struct semaphore *km_sem;
  38 #ifdef DEBUG_MUTEX
  39         int *km_stats;
  40         struct list_head km_list;
  41 #endif
  42 } kmutex_t;
  43
  44 extern int mutex_spin_max;
  45
  46 #ifdef DEBUG_MUTEX
  47 extern int mutex_stats[MUTEX_STATS_SIZE];
  48 extern struct mutex mutex_stats_lock;
  49 extern struct list_head mutex_stats_list;
  50 #define MUTEX_STAT_INC(stats, stat)     ((stats)[stat]++)
  51 #else
  52 #define MUTEX_STAT_INC(stats, stat)
  53 #endif
  54
  55 int spl_mutex_init(void);
  56 void spl_mutex_fini(void);
  57
  58 extern void __spl_mutex_init(kmutex_t *mp, char *name, int type, void *ibc);
  59 extern void __spl_mutex_destroy(kmutex_t *mp);
  60 extern int __mutex_tryenter(kmutex_t *mp);
  61 extern void __mutex_enter(kmutex_t *mp);
  62 extern void __mutex_exit(kmutex_t *mp);
  63 extern int __mutex_owned(kmutex_t *mp);
  64 extern kthread_t *__spl_mutex_owner(kmutex_t *mp);
  65
  66 #undef mutex_init
  67 #undef mutex_destroy
  68
  69 #define mutex_init(mp, name, type, ibc)                                 \
  70 ({                                                                      \
  71         if ((name) == NULL)                                             \
  72                 __spl_mutex_init(mp, #mp, type, ibc);                   \
  73         else                                                            \
  74                 __spl_mutex_init(mp, name, type, ibc);                  \
  75 })
  76 #define mutex_destroy(mp)       __spl_mutex_destroy(mp)
  77 #define mutex_tryenter(mp)      __mutex_tryenter(mp)
  78 #define mutex_enter(mp)         __mutex_enter(mp)
  79 #define mutex_exit(mp)          __mutex_exit(mp)
  80 #define mutex_owned(mp)         __mutex_owned(mp)
  81 #define mutex_owner(mp)         __spl_mutex_owner(mp)
  82 #define MUTEX_HELD(mp)          mutex_owned(mp)
  83
  84 #ifdef  __cplusplus
  85 }
  86 #endif
  87
  88 #endif  /* _SPL_MUTEX_H */