kernel/spinlock.h

   1 #ifndef __SPINLOCK_H__
   2 #define __SPINLOCK_H__
   3
   4 #include "kernel/kernel.h"
   5
   6 typedef struct spinlock {
   7         atomic_t val;
   8 } spinlock_t;
   9
  10 #ifndef CONFIG_SMP
  11
  12 #define SPINLOCK_DEFINE(name)
  13 #define PRIVATE_SPINLOCK_DEFINE(name)
  14 #define SPINLOCK_DECLARE(name)
  15 #define spinlock_init(sl)
  16 #define spinlock_lock(sl)
  17 #define spinlock_unlock(sl)
  18
  19 #else
  20
  21 /* SMP */
  22 #define SPINLOCK_DEFINE(name)   spinlock_t name;
  23 #define PRIVATE_SPINLOCK_DEFINE(name)   PRIVATE SPINLOCK_DEFINE(name)
  24 #define SPINLOCK_DECLARE(name)  extern SPINLOCK_DEFINE(name)
  25 #define spinlock_init(sl) do { (sl)->val = 0; } while (0)
  26
  27 #if CONFIG_MAX_CPUS == 1
  28 #define spinlock_lock(sl)
  29 #define spinlock_unlock(sl)
  30 #else
  31 void arch_spinlock_lock(atomic_t * sl);
  32 void arch_spinlock_unlock(atomic_t * sl);
  33 #define spinlock_lock(sl)       arch_spinlock_lock((atomic_t*) sl)
  34 #define spinlock_unlock(sl)     arch_spinlock_unlock((atomic_t*) sl)
  35 #endif
  36
  37
  38 #endif /* CONFIG_SMP */
  39
  40 #define BKL_LOCK()      spinlock_lock(&big_kernel_lock)
  41 #define BKL_UNLOCK()    spinlock_unlock(&big_kernel_lock)
  42
  43 #endif /* __SPINLOCK_H__ */