On 09/11/16 14:54, Zhengyu Gu wrote: > I am not sure I agree with OrderAccess change. I don't think release_store/load_acquire semantic > applies here... It doesn't, but it will work because cancelled_concgc() is polled in a loop. + OrderAccess::release_store(&_cancelled_concgc, true); This should be release_store_fence() Andrew.