include/asm-generic/qrwlock_types.h

   1 #ifndef __ASM_GENERIC_QRWLOCK_TYPES_H
   2 #define __ASM_GENERIC_QRWLOCK_TYPES_H
   3
   4 #include <linux/types.h>
   5 #include <asm/spinlock_types.h>
   6
   7 /*
   8  * The queue read/write lock data structure
   9  */
  10
  11 typedef struct qrwlock {
  12         union {
  13                 atomic_t cnts;
  14                 struct {
  15 #ifdef __LITTLE_ENDIAN
  16                         u8 wlocked;     /* Locked for write? */
  17                         u8 __lstate[3];
  18 #else
  19                         u8 __lstate[3];
  20                         u8 wlocked;     /* Locked for write? */
  21 #endif
  22                 };
  23         };
  24         arch_spinlock_t         wait_lock;
  25 } arch_rwlock_t;
  26
  27 #define __ARCH_RW_LOCK_UNLOCKED {               \
  28         { .cnts = ATOMIC_INIT(0), },            \
  29         .wait_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
  30 }
  31
  32 #endif /* __ASM_GENERIC_QRWLOCK_TYPES_H */