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4.7 KiB
HTML
<!--$Id: lock_stat.so,v 10.30 2000/12/08 20:43:15 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: lock_stat</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>lock_stat</h1>
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</td>
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<td width="1%">
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<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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#include <db.h>
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<p>
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int
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lock_stat(DB_ENV *env,
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DB_LOCK_STAT **statp, void *(*db_malloc)(size_t));
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</pre></h3>
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<h1>Description</h1>
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<p>The lock_stat function
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creates a statistical structure and copies a pointer to it into a
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user-specified memory location.
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<p>Statistical structures are created in allocated memory. If <b>db_malloc</b> is non-NULL, it
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is called to allocate the memory, otherwise, the library function
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<b>malloc</b>(3) is used. The function <b>db_malloc</b> must match
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the calling conventions of the <b>malloc</b>(3) library routine.
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Regardless, the caller is responsible for deallocating the returned
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memory. To deallocate returned memory, free the returned memory
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reference, references inside the returned memory do not need to be
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individually freed.
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<p>The lock region statistics are stored in a structure of type
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DB_LOCK_STAT. The following DB_LOCK_STAT fields will be filled in:
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<p><dl compact>
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<dt>u_int32_t st_lastid;<dd>The last allocated lock ID.
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<dt>u_int32_t st_nmodes;<dd>The number of lock modes.
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<dt>u_int32_t st_maxlocks;<dd>The maximum number of locks possible.
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<dt>u_int32_t st_maxlockers;<dd>The maximum number of lockers possible.
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<dt>u_int32_t st_maxobjects;<dd>The maximum number of objects possible.
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<dt>u_int32_t st_nlocks;<dd>The number of current locks.
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<dt>u_int32_t st_maxnlocks;<dd>The maximum number of locks at any one time.
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<dt>u_int32_t st_nlockers;<dd>The number of current lockers.
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<dt>u_int32_t st_maxnlockers;<dd>The maximum number of lockers at any one time.
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<dt>u_int32_t st_nobjects;<dd>The number of current objects.
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<dt>u_int32_t st_maxnobjects;<dd>The maximum number of objects at any one time.
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<dt>u_int32_t st_nrequests;<dd>The total number of locks requested.
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<dt>u_int32_t st_nreleases;<dd>The total number of locks released.
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<dt>u_int32_t st_nnowaits;<dd>The total number of lock requests that failed because
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<a href="../api_c/lock_vec.html#DB_LOCK_NOWAIT">DB_LOCK_NOWAIT</a> was set.
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<dt>u_int32_t st_nconflicts;<dd>The total number of locks not immediately available due to conflicts.
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<dt>u_int32_t st_ndeadlocks;<dd>The number of deadlocks detected.
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<dt>u_int32_t st_regsize;<dd>The size of the region.
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<dt>u_int32_t st_region_wait;<dd>The number of times that a thread of control was forced to wait before
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obtaining the region lock.
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<dt>u_int32_t st_region_nowait;<dd>The number of times that a thread of control was able to obtain
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the region lock without waiting.
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</dl>
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<p>The lock_stat function returns a non-zero error value on failure and 0 on success.
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<h1>Errors</h1>
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<p>The lock_stat function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
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If a catastrophic error has occurred, the lock_stat function may fail and return
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<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
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in the same way.
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<h1>See Also</h1>
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<a href="../api_c/env_set_lk_conflicts.html">DBENV->set_lk_conflicts</a>,
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<a href="../api_c/env_set_lk_detect.html">DBENV->set_lk_detect</a>,
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<a href="../api_c/env_set_lk_max_locks.html">DBENV->set_lk_max_locks</a>,
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<a href="../api_c/env_set_lk_max_lockers.html">DBENV->set_lk_max_lockers</a>,
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<a href="../api_c/env_set_lk_max_objects.html">DBENV->set_lk_max_objects</a>,
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<a href="../api_c/env_set_lk_max.html">DBENV->set_lk_max</a>,
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<a href="../api_c/lock_detect.html">lock_detect</a>,
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<a href="../api_c/lock_get.html">lock_get</a>,
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<a href="../api_c/lock_id.html">lock_id</a>,
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<a href="../api_c/lock_put.html">lock_put</a>,
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<a href="../api_c/lock_stat.html">lock_stat</a>
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and
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<a href="../api_c/lock_vec.html">lock_vec</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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