diff options
Diffstat (limited to 'src/support.h')
| -rw-r--r-- | src/support.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/support.h b/src/support.h index 5256e62..99cd518 100644 --- a/src/support.h +++ b/src/support.h @@ -82,4 +82,25 @@ sogetsockaddr(struct socket *so, struct sockaddr **nam) return (error); } +/* These are defined in sys/compat/linuxkpi/common/include/linux/compiler.h, + * however I don't really want to include all that. */ +#define barrier() __asm__ __volatile__("": : :"memory") + +#define ACCESS_ONCE(x) (*(volatile __typeof(x) *)&(x)) + +#define WRITE_ONCE(x,v) do { \ + barrier(); \ + ACCESS_ONCE(x) = (v); \ + barrier(); \ +} while (0) + +#define READ_ONCE(x) ({ \ + __typeof(x) __var = ({ \ + barrier(); \ + ACCESS_ONCE(x); \ + }); \ + barrier(); \ + __var; \ +}) + #endif |