include/sys/condvar.h

   1 #ifndef _SPL_CONDVAR_H
   2 #define _SPL_CONDVAR_H
   3
   4 #ifdef  __cplusplus
   5 extern "C" {
   6 #endif
   7
   8 #include <linux/module.h>
   9 #include <linux/wait.h>
  10 #include <sys/mutex.h>
  11
  12 /* The kcondvar_t struct is protected by mutex taken externally before
  13  * calling any of the wait/signal funs, and passed into the wait funs.
  14  */
  15 #define CV_MAGIC                        0x346545f4
  16 #define CV_POISON                       0x95
  17
  18 typedef struct {
  19         int cv_magic;
  20         char *cv_name;
  21         int cv_name_size;
  22         wait_queue_head_t cv_event;
  23         atomic_t cv_waiters;
  24         kmutex_t *cv_mutex;
  25         spinlock_t cv_lock;
  26 } kcondvar_t;
  27
  28 typedef enum { CV_DEFAULT=0, CV_DRIVER } kcv_type_t;
  29
  30 extern void __cv_init(kcondvar_t *cvp, char *name, kcv_type_t type, void *arg);
  31 extern void __cv_destroy(kcondvar_t *cvp);
  32 extern void __cv_wait(kcondvar_t *cvp, kmutex_t *mp);
  33 extern clock_t __cv_timedwait(kcondvar_t *cvp, kmutex_t *mp,
  34                               clock_t expire_time);
  35 extern void __cv_signal(kcondvar_t *cvp);
  36 extern void __cv_broadcast(kcondvar_t *cvp);
  37
  38 #define cv_init(cvp, name, type, arg)                                 \
  39 ({                                                                    \
  40         if ((name) == NULL)                                           \
  41                 __cv_init(cvp, #cvp, type, arg);                      \
  42         else                                                          \
  43                 __cv_init(cvp, name, type, arg);                      \
  44 })
  45 #define cv_destroy(cvp)                 __cv_destroy(cvp)
  46 #define cv_wait(cvp, mp)                __cv_wait(cvp, mp)
  47 #define cv_timedwait(cvp, mp, t)        __cv_timedwait(cvp, mp, t)
  48 #define cv_signal(cvp)                  __cv_signal(cvp)
  49 #define cv_broadcast(cvp)               __cv_broadcast(cvp)
  50
  51 #endif /* _SPL_CONDVAR_H */