diff options
| author | Richard Braun <rbraun@sceen.net> | 2017-03-15 21:43:41 +0100 |
|---|---|---|
| committer | Richard Braun <rbraun@sceen.net> | 2017-03-15 21:56:42 +0100 |
| commit | 196eae0d9ee0d2d8ca42e96e49d6988313d39f6d (patch) | |
| tree | 81d20378edede1e02d8f8f578331848715667877 /kern/macros.h | |
| parent | 0f8c14517212dfd03c5cafcab56ffc7dead18209 (diff) | |
kern/syscnt: replace the evcnt module
The syscnt module supports more generic counters, in addition to atomic
access from any context on any architecture.
Diffstat (limited to 'kern/macros.h')
| -rw-r--r-- | kern/macros.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kern/macros.h b/kern/macros.h index a5b7b032..f3eb1075 100644 --- a/kern/macros.h +++ b/kern/macros.h @@ -55,6 +55,9 @@ #define structof(ptr, type, member) \ ((type *)((char *)(ptr) - offsetof(type, member))) +#define read_once(x) (*(volatile typeof(x) *)&(x)) +#define write_once(x, v) (read_once(x) = (v)) + #define alignof(x) __alignof__(x) #define likely(expr) __builtin_expect(!!(expr), 1) |