race condition on  update counter for a page, a pagecounter could be removed by another process
race condition on  update counter for a page, a pagecounter could be removed by another process

git-svn-id: 8a657200d0854a286cb489334e0912b153950abf@1185 9fbdc01b-0d2c-0410-bfb7-fb27d70d8b52

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