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<title>Mutex Types</title>
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<!-- keywords: SQLITE_MUTEX_FAST SQLITE_MUTEX_RECURSIVE SQLITE_MUTEX_STATIC_APP1 SQLITE_MUTEX_STATIC_APP2 SQLITE_MUTEX_STATIC_APP3 SQLITE_MUTEX_STATIC_LRU SQLITE_MUTEX_STATIC_LRU2 SQLITE_MUTEX_STATIC_MAIN SQLITE_MUTEX_STATIC_MEM SQLITE_MUTEX_STATIC_MEM2 SQLITE_MUTEX_STATIC_OPEN SQLITE_MUTEX_STATIC_PMEM SQLITE_MUTEX_STATIC_PRNG SQLITE_MUTEX_STATIC_VFS1 SQLITE_MUTEX_STATIC_VFS2 SQLITE_MUTEX_STATIC_VFS3 -->
<div class=nosearch>
<a href="intro.html"><h2>SQLite C Interface</h2></a>
<h2>Mutex Types</h2>
</div>
<blockquote><pre>
#define SQLITE_MUTEX_FAST 0
#define SQLITE_MUTEX_RECURSIVE 1
#define SQLITE_MUTEX_STATIC_MAIN 2
#define SQLITE_MUTEX_STATIC_MEM 3 /* sqlite3_malloc() */
#define SQLITE_MUTEX_STATIC_MEM2 4 /* NOT USED */
#define SQLITE_MUTEX_STATIC_OPEN 4 /* sqlite3BtreeOpen() */
#define SQLITE_MUTEX_STATIC_PRNG 5 /* sqlite3_randomness() */
#define SQLITE_MUTEX_STATIC_LRU 6 /* lru page list */
#define SQLITE_MUTEX_STATIC_LRU2 7 /* NOT USED */
#define SQLITE_MUTEX_STATIC_PMEM 7 /* sqlite3PageMalloc() */
#define SQLITE_MUTEX_STATIC_APP1 8 /* For use by application */
#define SQLITE_MUTEX_STATIC_APP2 9 /* For use by application */
#define SQLITE_MUTEX_STATIC_APP3 10 /* For use by application */
#define SQLITE_MUTEX_STATIC_VFS1 11 /* For use by built-in VFS */
#define SQLITE_MUTEX_STATIC_VFS2 12 /* For use by extension VFS */
#define SQLITE_MUTEX_STATIC_VFS3 13 /* For use by application VFS */
</pre></blockquote>
<p>
The <a href="../c3ref/mutex_alloc.html">sqlite3_mutex_alloc()</a> interface takes a single argument
which is one of these integer constants.</p>
<p>The set of static mutexes may change from one SQLite release to the
next. Applications that override the built-in mutex logic must be
prepared to accommodate additional static mutexes.
</p><p>See also lists of
<a href="objlist.html">Objects</a>,
<a href="constlist.html">Constants</a>, and
<a href="funclist.html">Functions</a>.</p>
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