| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | pgsql-patches(at)postgresql(dot)org |
| Cc: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Subject: | Synchronized Scan |
| Date: | 2007-05-20 22:01:32 |
| Message-ID: | 1179698492.2771.114.camel@jdavis |
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| Lists: | pgsql-patches |
Here is the latest version of my patch that's revised according to my
discussions with Heikki and Simon:
Changes:
* uses LWLocks when accessing shared memory
* removes the "sync_seqscan_offset" feature
* uses the relfilenode as a key rather than relation OID
* fixes regression test failure
* uses a simple LRU (that stays in fixed-size shared memory) to track
the locations of other concurrent scans
For the LRU I used a doubly-linked list, which isn't strictly necessary.
However, we may decide to use a hash table for the lookup, in which case
the extra pointers will be useful.
Regards,
Jeff Davis
| Attachment | Content-Type | Size |
|---|---|---|
| syncscan20.patch | text/x-patch | 19.2 KB |
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