From: Alex Bennée <alex.ben...@linaro.org> Useful for counting down.
Signed-off-by: Alex Bennée <alex.ben...@linaro.org> Signed-off-by: Sergey Fedorov <sergey.fedo...@linaro.org> --- include/qemu/atomic.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h index 7e13fca351d1..560b1af703a8 100644 --- a/include/qemu/atomic.h +++ b/include/qemu/atomic.h @@ -160,6 +160,8 @@ #define atomic_fetch_and(ptr, n) __atomic_fetch_and(ptr, n, __ATOMIC_SEQ_CST) #define atomic_fetch_or(ptr, n) __atomic_fetch_or(ptr, n, __ATOMIC_SEQ_CST) +#define atomic_dec_fetch(ptr) __atomic_sub_fetch(ptr, 1, __ATOMIC_SEQ_CST) + /* And even shorter names that return void. */ #define atomic_inc(ptr) ((void) __atomic_fetch_add(ptr, 1, __ATOMIC_SEQ_CST)) #define atomic_dec(ptr) ((void) __atomic_fetch_sub(ptr, 1, __ATOMIC_SEQ_CST)) @@ -355,6 +357,8 @@ #define atomic_fetch_or __sync_fetch_and_or #define atomic_cmpxchg __sync_val_compare_and_swap +#define atomic_dec_fetch(ptr) __sync_sub_and_fetch(ptr, 1) + /* And even shorter names that return void. */ #define atomic_inc(ptr) ((void) __sync_fetch_and_add(ptr, 1)) #define atomic_dec(ptr) ((void) __sync_fetch_and_add(ptr, -1)) -- 2.9.1
