diff options
Diffstat (limited to 'include/my_atomic.h')
| -rw-r--r-- | include/my_atomic.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/my_atomic.h b/include/my_atomic.h index 8ba3e201730..a2f454ac319 100644 --- a/include/my_atomic.h +++ b/include/my_atomic.h @@ -20,6 +20,7 @@ This header defines five atomic operations: my_atomic_add#(&var, what) + 'Fetch and Add' add 'what' to *var, and return the old value of *var my_atomic_fas#(&var, what) @@ -27,9 +28,10 @@ store 'what' in *var, and return the old value of *var my_atomic_cas#(&var, &old, new) - 'Compare And Swap' + An odd variation of 'Compare And Set/Swap' if *var is equal to *old, then store 'new' in *var, and return TRUE otherwise store *var in *old, and return FALSE + Usually, &old should not be accessed if the operation is successful. my_atomic_load#(&var) return *var |