Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 29 Jan 2003 00:41:33 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] (1/4) 2.5.59 fast reader/writer lock for gettimeofday |
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Anton Blanchard <anton@samba.org> wrote: > > > > These need to be mb(), not wmb(), if you want the bits in between > > to actually happen in between, as with your xtime example. At > > present there's nothing stoping xtime from being *read* before > > your read from pre_sequence happens. > > But with frlocks we synchronise writers with a spinlock, so shouldnt it > provide that synchronisation? >
Richard is referring to the new fr_write_begin/end code, which doesn't take a spinlock because it assumes that writer serialisation has been provided by external means.
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