<!--$Id: lock_stat.so,v 10.54 2003/11/08 19:17:35 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv::lock_stat</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h3>DbEnv::lock_stat</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a> <a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db_cxx.h> <p> int DbEnv::lock_stat(DB_LOCK_STAT **statp, u_int32_t flags); </pre></h3> <hr size=1 noshade> <h3>Description: DbEnv::lock_stat</h3> <p>The DbEnv::lock_stat method returns the locking subsystem statistics.</p> <p>The DbEnv::lock_stat method creates a statistical structure of type DB_LOCK_STAT and copies a pointer to it into a user-specified memory location.</p> <p>Statistical structures are stored in allocated memory. If application-specific allocation routines have been declared (see <a href="../../db42-devel-4.2.52/api_cxx/env_set_alloc.html">DbEnv::set_alloc</a> for more information), they are used to allocate the memory; otherwise, the standard C library <b>malloc</b>(3) is used. The caller is responsible for deallocating the memory. To deallocate the memory, free the memory reference; references inside the returned memory need not be individually freed.</p> <p>The following DB_LOCK_STAT fields will be filled in:</p> <p><dl compact> <dt>u_int32_t st_id;<dd>The last allocated locker ID. <dt>u_int32_t st_cur_maxid;<dd>The current maximum unused locker ID. <dt>u_int32_t st_nmodes;<dd>The number of lock modes. <dt>u_int32_t st_maxlocks;<dd>The maximum number of locks possible. <dt>u_int32_t st_maxlockers;<dd>The maximum number of lockers possible. <dt>u_int32_t st_maxobjects;<dd>The maximum number of lock objects possible. <dt>u_int32_t st_nlocks;<dd>The number of current locks. <dt>u_int32_t st_maxnlocks;<dd>The maximum number of locks at any one time. <dt>u_int32_t st_nlockers;<dd>The number of current lockers. <dt>u_int32_t st_maxnlockers;<dd>The maximum number of lockers at any one time. <dt>u_int32_t st_nobjects;<dd>The number of current lock objects. <dt>u_int32_t st_maxnobjects;<dd>The maximum number of lock objects at any one time. <dt>u_int32_t st_nrequests;<dd>The total number of locks requested. <dt>u_int32_t st_nreleases;<dd>The total number of locks released. <dt>u_int32_t st_nnowaits;<dd>The total number of lock requests failing because <a href="../../db42-devel-4.2.52/api_cxx/lock_vec.html#DB_LOCK_NOWAIT">DB_LOCK_NOWAIT</a> was set. <dt>u_int32_t st_nconflicts;<dd>The total number of locks not immediately available due to conflicts. <dt>u_int32_t st_ndeadlocks;<dd>The number of deadlocks. <dt>u_int32_t st_locktimeout;<dd>Lock timeout value. <dt>u_int32_t st_nlocktimeouts;<dd>The number of lock requests that have timed out. <dt>u_int32_t st_txntimeout;<dd>Transaction timeout value. <dt>u_int32_t st_ntxntimeouts;<dd>The number of transactions that have timed out. This value is also a component of <b>st_ndeadlocks</b>, the total number of deadlocks detected. <dt>u_int32_t st_regsize;<dd>The size of the lock region. <dt>u_int32_t st_region_wait;<dd>The number of times that a thread of control was forced to wait before obtaining the region lock. <dt>u_int32_t st_region_nowait;<dd>The number of times that a thread of control was able to obtain the region lock without waiting. </dl> <p>The DbEnv::lock_stat method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>flags</b><dd> The <b>flags</b> parameter must be set to 0 or the following value: <p><dl compact> <p><dt><a name="DB_STAT_CLEAR">DB_STAT_CLEAR</a><dd>Reset statistics after returning their values. </dl> <p><dt><b>statp</b><dd> The <b>statp</b> parameter references memory into which a pointer to the allocated statistics structure is copied. </dl> <h3>Errors</h3> <p>The DbEnv::lock_stat method may fail and throw <a href="../../db42-devel-4.2.52/api_cxx/except_class.html">DbException</a>, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:</p> <p><dl compact> <p><dt>EINVAL<dd>An invalid flag value or parameter was specified. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_cxx/env_class.html">DbEnv</a>, <a href="../../db42-devel-4.2.52/api_cxx/lock_class.html">DbLock</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_cxx/lock_list.html">Locking Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a><a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="../../db42-devel-4.2.52/sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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