> 2023年11月10日 22:31，jacktby jacktby <jacktby(at)gmail(dot)com> 写道：
>
> In the bus_internal.h,I see
> ====================================================
> Note: Buffer header lock (BM_LOCKED flag) must be held to examine or change tag, state or wait_backend_pgprocno fields.
> ====================================================
> As we all know, this buffer header lock is implemented by a bit in state filed, and this state field is a atomic_u32 type, so in fact we don’t need to
> hold buffer lock when we update state, this comment has error，right?
Oh, sorry this is true, in fact we never acquire a spin lock when update the state.