modules/spl/spl-rwlock.c

   1 #include <sys/rwlock.h>
   2
   3 int
   4 rw_lock_held(krwlock_t *rwlp)
   5 {
   6         BUG_ON(rwlp->rw_magic != RW_MAGIC);
   7
   8 #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
   9         if (rwlp->rw_sem.activity != 0) {
  10 #else
  11         if (rwlp->rw_sem.count != 0) {
  12 #endif
  13                 return 1;
  14         }
  15
  16         return 0;
  17 }
  18
  19 int
  20 rw_read_held(krwlock_t *rwlp)
  21 {
  22         BUG_ON(rwlp->rw_magic != RW_MAGIC);
  23
  24         if (rw_lock_held(rwlp) && rwlp->rw_owner == NULL) {
  25                 return 1;
  26         }
  27
  28         return 0;
  29 }
  30
  31 int
  32 rw_write_held(krwlock_t *rwlp)
  33 {
  34         BUG_ON(rwlp->rw_magic != RW_MAGIC);
  35
  36         if (rwlp->rw_owner == current) {
  37                 return 1;
  38         }
  39
  40         return 0;
  41 }