diff options
Diffstat (limited to 'exec-all.h')
| -rw-r--r-- | exec-all.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/exec-all.h b/exec-all.h index 3c79eca917..9ecf2dca7f 100644 --- a/exec-all.h +++ b/exec-all.h @@ -400,6 +400,20 @@ static inline int testandset (int *p) } #endif +#ifdef __x86_64__ +static inline int testandset (int *p) +{ + char ret; + int readval; + + __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0" + : "=q" (ret), "=m" (*p), "=a" (readval) + : "r" (1), "m" (*p), "a" (0) + : "memory"); + return ret; +} +#endif + #ifdef __s390__ static inline int testandset (int *p) { |