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BerkeleyDB-Core-Cxx-Txn.pdf
(1007.21 KB)
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abortresults.html
(3.37 KB)
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apireq.html
(8.15 KB)
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architectrecovery.html
(25.01 KB)
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autocommit.html
(7.71 KB)
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backuprestore.html
(18.35 KB)
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blocking_deadlocks.html
(32.31 KB)
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deadlock.jpg
(12.3 KB)
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enabletxn.html
(45 KB)
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envopen.html
(7.22 KB)
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exclusivelock.html
(4.61 KB)
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filemanagement.html
(14.08 KB)
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gettingStarted.css
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hotfailover.html
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index.html
(18.38 KB)
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inmem_txnexample_c.html
(21.47 KB)
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introduction.html
(8.39 KB)
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isolation.html
(32.43 KB)
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lockingsubsystem.html
(25.48 KB)
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logconfig.html
(17.96 KB)
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logfileremoval.html
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maxtxns.html
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moreinfo.html
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multithread-intro.html
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nestedtxn.html
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nodurabletxn.html
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perftune-intro.html
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preface.html
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readblock.jpg
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readmodifywrite.html
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recovery-intro.html
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recovery.html
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reversesplit.html
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rwlocks1-pdf.jpg
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rwlocks1.jpg
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simplelock-pdf.jpg
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simplelock.jpg
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sysfailure.html
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txn_ccursor.html
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txnconcurrency.html
(13.8 KB)
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txncursor.html
(4.68 KB)
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txnexample_c.html
(27.19 KB)
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txnindices.html
(5.22 KB)
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txnnowait.html
(3.48 KB)
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usingtxns.html
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wrapup.html
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writeblock.jpg
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Editing: txnnowait.html
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>No Wait on Blocks</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Getting Started with Berkeley DB Transaction Processing" /> <link rel="up" href="txnconcurrency.html" title="Chapter 4. Concurrency" /> <link rel="prev" href="readmodifywrite.html" title="Read/Modify/Write" /> <link rel="next" href="reversesplit.html" title="Reverse BTree Splits" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">No Wait on Blocks</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="readmodifywrite.html">Prev</a> </td> <th width="60%" align="center">Chapter 4. Concurrency</th> <td width="20%" align="right"> <a accesskey="n" href="reversesplit.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="txnnowait"></a>No Wait on Blocks</h2> </div> </div> </div> <p> Normally when a DB transaction is blocked on a lock request, it must wait until the requested lock becomes available before its thread-of-control can proceed. However, it is possible to configure a transaction handle such that it will report a deadlock rather than wait for the block to clear. </p> <p> You do this on a transaction by transaction basis by specifying <span> <code class="literal">DB_TXN_NOWAIT</code> to the <code class="methodname">DbEnv::txn_begin()</code> method. </span> </p> <p> For example: </p> <pre class="programlisting"> DbTxn *txn = NULL; try { envp->txn_begin(NULL, &txn, DB_TXN_NOWAIT); ... } catch (DbException &de) { // Deadlock detection and exception handling omitted // for brevity ...</pre> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="readmodifywrite.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="txnconcurrency.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="reversesplit.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">Read/Modify/Write </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> Reverse BTree Splits</td> </tr> </table> </div> </body> </html>
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