Re: visibility maps

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От Pavan Deolasee
Тема Re: visibility maps
Дата
Msg-id 2e78013d0812060646rbee1676g76e54e3c0d55d818@mail.gmail.com
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Ответ на Re: visibility maps  (Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>)
Ответы Re: visibility maps  (Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>)
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<br /><br /><div class="gmail_quote">On Sat, Dec 6, 2008 at 7:57 PM, Heikki Linnakangas <span dir="ltr"><<a
href="mailto:heikki.linnakangas@enterprisedb.com">heikki.linnakangas@enterprisedb.com</a>></span>wrote:<br
/><blockquoteclass="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex;
padding-left:1ex;"><div class="Ih2E3d"><br /></div> Umm, what non-atomic state could the bit be in? Half-set,
half-cleared?Or do you think that if some other bit in proximity is changed, the other bit would temporarily flip
0->1->0,or something like that? I don't think that should happen.<br /><br /></blockquote></div><br clear="all"
/>Sincethe lock is not held, the bit can be flipped while we are reading, isn't it ? IOW, the test is not reliable is
whatI fear.<br /><br />Thanks,<br />Pavan<br /><br />-- <br />Pavan Deolasee<br /> EnterpriseDB     <a
href="http://www.enterprisedb.com">http://www.enterprisedb.com</a><br/> 

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