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-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
-<html>
- <head>
- <title>Relocating a File Data Structure</title>
- </head>
-
- <body>
- <h1>Relocating a File Data Structure</h1>
-
- <p>Since file data structures can be cached in memory by the H5AC
- package it becomes problematic to move such a data structure in
- the file. One cannot just copy a portion of the file from one
- location to another because:
-
- <ol>
- <li>the file might not contain the latest information, and</li>
- <li>the H5AC package might not realize that the object's
- address has changed and attempt to write the object to disk
- at the old address.</li>
- </ol>
-
- <p>Here's a correct method to move data from one location to
- another. The example code assumes that one is moving a B-link
- tree node from <code>old_addr</code> to <code>new_addr</code>.
-
- <ol>
- <li>Make sure the disk is up-to-date with respect to the
- cache. There is no need to remove the item from the cache,
- hence the final argument to <code>H5AC_flush</code> is
- <code>FALSE</code>.
- <br><br>
- <code>
- H5AC_flush (f, H5AC_BT, old_addr, FALSE);<br>
- </code>
- <br>
- </li>
-
- <li>Read the data from the old address and write it to the new
- address.
- <br><br>
- <code>
- H5F_block_read (f, old_addr, size, buf);<br>
- H5F_block_write (f, new_addr, size, buf);<br>
- </code>
- <br>
- </li>
-
- <li>Notify the cache that the address of the object changed.
- <br><br>
- <code>
- H5AC_rename (f, H5AC_BT, old_addr, new_addr);<br>
- </code>
- <br>
- </li>
- </ol>
-
-
-
- <hr>
- <address><a href="mailto:robb@maya.nuance.com">Robb Matzke</a></address>
-<!-- Created: Mon Jul 14 15:09:06 EST 1997 -->
-<!-- hhmts start -->
-Last modified: Mon Jul 14 15:38:29 EST
-<!-- hhmts end -->
- </body>
-</html>