1 /****************************************************************************
2 ****************************************************************************
4 *** This header was automatically generated from a Linux kernel header
5 *** of the same name, to make information necessary for userspace to
6 *** call into the kernel available to libc. It contains only constants,
7 *** structures, and macros generated from the original header, and thus,
8 *** contains no copyrightable information.
10 ****************************************************************************
11 ****************************************************************************/
12 #ifndef __ARCH_I386_ATOMIC__
13 #define __ARCH_I386_ATOMIC__
15 #include <linux/compiler.h>
16 #include <asm/processor.h>
17 #include <asm/cmpxchg.h>
19 typedef struct { int counter; } atomic_t;
21 #define ATOMIC_INIT(i) { (i) }
23 #define atomic_read(v) ((v)->counter)
25 #define atomic_set(v,i) (((v)->counter) = (i))
27 #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
28 #define atomic_xchg(v, new) (xchg(&((v)->counter), (new)))
29 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
30 #define atomic_inc_return(v) (atomic_add_return(1,v))
31 #define atomic_dec_return(v) (atomic_sub_return(1,v))
32 #define atomic_clear_mask(mask, addr) __asm__ __volatile__(LOCK_PREFIX "andl %0,%1" : : "r" (~(mask)),"m" (*addr) : "memory")
33 #define atomic_set_mask(mask, addr) __asm__ __volatile__(LOCK_PREFIX "orl %0,%1" : : "r" (mask),"m" (*(addr)) : "memory")
34 #define smp_mb__before_atomic_dec() barrier()
35 #define smp_mb__after_atomic_dec() barrier()
36 #define smp_mb__before_atomic_inc() barrier()
37 #define smp_mb__after_atomic_inc() barrier()
38 #include <asm-generic/atomic.h>