| handle | The AtomicSafetyHandle to check. |
检查句柄是否仍然有效，如果句柄已销毁，则抛出异常。
An AtomicSafetyHandle becomes invalid when the version number it stores no longer matches the version number of the associated entry in the safety system. This always happens when AtomicSafetyHandle.Release has been called on this handle, or on one of the other handles referencing the same memory region. It can also happen if this handle is using the secondary version and some handle has called AtomicSafetyHandle.CheckWriteAndBumpSecondaryVersion or AtomicSafetyHandle.SetBumpSecondaryVersionOnSchedule.
For more information about container version numbers, see Copying NativeContainer structures.
CheckExistsAndThrow is identical in behavior to AtomicSafetyHandle.IsHandleValid, except that it throws an exception when the handle is not valid, rather than returning false.