diff options
Diffstat (limited to 'sys/arch/amd64/include/atomic.h')
| -rw-r--r-- | sys/arch/amd64/include/atomic.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/sys/arch/amd64/include/atomic.h b/sys/arch/amd64/include/atomic.h index effbb04c4db..48df00fae57 100644 --- a/sys/arch/amd64/include/atomic.h +++ b/sys/arch/amd64/include/atomic.h @@ -1,4 +1,4 @@ -/* $OpenBSD: atomic.h,v 1.8 2011/03/23 16:54:34 pirofti Exp $ */ +/* $OpenBSD: atomic.h,v 1.9 2012/11/19 15:18:06 pirofti Exp $ */ /* $NetBSD: atomic.h,v 1.1 2003/04/26 18:39:37 fvdl Exp $ */ /* @@ -90,6 +90,17 @@ x86_atomic_clearbits_u32(volatile u_int32_t *ptr, u_int32_t bits) __asm __volatile(LOCK " andl %1,%0" : "=m" (*ptr) : "ir" (~bits)); } +static __inline int +x86_atomic_cas_int32(volatile int32_t *ptr, int32_t expect, int32_t set) +{ + int res; + + __asm volatile(LOCK " cmpxchgl %2, %1" : "=a" (res), "=m" (*ptr) + : "r" (set), "a" (expect), "m" (*ptr) : "memory"); + + return (res); +} + static __inline u_long x86_atomic_cas_ul(volatile u_long *ptr, u_long expect, u_long set) { |