diff options
| -rw-r--r-- | src/include/storage/s_lock.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/include/storage/s_lock.h b/src/include/storage/s_lock.h index ff7eb1418e6..9b02d1f5a40 100644 --- a/src/include/storage/s_lock.h +++ b/src/include/storage/s_lock.h @@ -358,6 +358,9 @@ typedef unsigned int slock_t; #define TAS(lock) tas(lock) +/* On PPC, it's a win to use a non-locking test before the lwarx */ +#define TAS_SPIN(lock) (*(lock) ? 1 : TAS(lock)) + /* * NOTE: per the Enhanced PowerPC Architecture manual, v1.0 dated 7-May-2002, * an isync is a sufficient synchronization barrier after a lwarx/stwcx loop. |