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TOMOYO Linux Cross Reference
Linux/include/asm-generic/local.h

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  1 #ifndef _ASM_GENERIC_LOCAL_H
  2 #define _ASM_GENERIC_LOCAL_H
  3 
  4 #include <linux/percpu.h>
  5 #include <linux/atomic.h>
  6 #include <asm/types.h>
  7 
  8 /*
  9  * A signed long type for operations which are atomic for a single CPU.
 10  * Usually used in combination with per-cpu variables.
 11  *
 12  * This is the default implementation, which uses atomic_long_t.  Which is
 13  * rather pointless.  The whole point behind local_t is that some processors
 14  * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs
 15  * running on this CPU.  local_t allows exploitation of such capabilities.
 16  */
 17 
 18 /* Implement in terms of atomics. */
 19 
 20 /* Don't use typedef: don't want them to be mixed with atomic_t's. */
 21 typedef struct
 22 {
 23         atomic_long_t a;
 24 } local_t;
 25 
 26 #define LOCAL_INIT(i)   { ATOMIC_LONG_INIT(i) }
 27 
 28 #define local_read(l)   atomic_long_read(&(l)->a)
 29 #define local_set(l,i)  atomic_long_set((&(l)->a),(i))
 30 #define local_inc(l)    atomic_long_inc(&(l)->a)
 31 #define local_dec(l)    atomic_long_dec(&(l)->a)
 32 #define local_add(i,l)  atomic_long_add((i),(&(l)->a))
 33 #define local_sub(i,l)  atomic_long_sub((i),(&(l)->a))
 34 
 35 #define local_sub_and_test(i, l) atomic_long_sub_and_test((i), (&(l)->a))
 36 #define local_dec_and_test(l) atomic_long_dec_and_test(&(l)->a)
 37 #define local_inc_and_test(l) atomic_long_inc_and_test(&(l)->a)
 38 #define local_add_negative(i, l) atomic_long_add_negative((i), (&(l)->a))
 39 #define local_add_return(i, l) atomic_long_add_return((i), (&(l)->a))
 40 #define local_sub_return(i, l) atomic_long_sub_return((i), (&(l)->a))
 41 #define local_inc_return(l) atomic_long_inc_return(&(l)->a)
 42 
 43 #define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n))
 44 #define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n))
 45 #define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u))
 46 #define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)
 47 
 48 /* Non-atomic variants, ie. preemption disabled and won't be touched
 49  * in interrupt, etc.  Some archs can optimize this case well. */
 50 #define __local_inc(l)          local_set((l), local_read(l) + 1)
 51 #define __local_dec(l)          local_set((l), local_read(l) - 1)
 52 #define __local_add(i,l)        local_set((l), local_read(l) + (i))
 53 #define __local_sub(i,l)        local_set((l), local_read(l) - (i))
 54 
 55 #endif /* _ASM_GENERIC_LOCAL_H */
 56 

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