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