1 files changed, 203 insertions, 0 deletions
diff --git a/www/c3ref/mutex_methods.html b/www/c3ref/mutex_methods.html
new file mode 100644
index 0000000..2d47826
--- /dev/null
+++ b/www/c3ref/mutex_methods.html
@@ -0,0 +1,203 @@
+<!DOCTYPE html>
+<html><head>
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<link href="../sqlite.css" rel="stylesheet">
+<title>Mutex Methods Object</title>
+<!-- path=../ -->
+</head>
+<body>
+<div class=nosearch>
+<a href="../index.html">
+<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0">
+</a>
+<div><!-- IE hack to prevent disappearing logo --></div>
+<div class="tagline desktoponly">
+Small. Fast. Reliable.<br>Choose any three.
+</div>
+<div class="menu mainmenu">
+<ul>
+<li><a href="../index.html">Home</a>
+<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a>
+<li class='wideonly'><a href='../about.html'>About</a>
+<li class='desktoponly'><a href="../docs.html">Documentation</a>
+<li class='desktoponly'><a href="../download.html">Download</a>
+<li class='wideonly'><a href='../copyright.html'>License</a>
+<li class='desktoponly'><a href="../support.html">Support</a>
+<li class='desktoponly'><a href="../prosupport.html">Purchase</a>
+<li class='search' id='search_menubutton'>
+<a href="javascript:void(0)" onclick='toggle_search()'>Search</a>
+</ul>
+</div>
+<div class="menu submenu" id="submenu">
+<ul>
+<li><a href='../about.html'>About</a>
+<li><a href='../docs.html'>Documentation</a>
+<li><a href='../download.html'>Download</a>
+<li><a href='../support.html'>Support</a>
+<li><a href='../prosupport.html'>Purchase</a>
+</ul>
+</div>
+<div class="searchmenu" id="searchmenu">
+<form method="GET" action="../search">
+<select name="s" id="searchtype">
+<option value="d">Search Documentation</option>
+<option value="c">Search Changelog</option>
+</select>
+<input type="text" name="q" id="searchbox" value="">
+<input type="submit" value="Go">
+</form>
+</div>
+</div>
+<script>
+function toggle_div(nm) {
+var w = document.getElementById(nm);
+if( w.style.display=="block" ){
+w.style.display = "none";
+}else{
+w.style.display = "block";
+}
+}
+function toggle_search() {
+var w = document.getElementById("searchmenu");
+if( w.style.display=="block" ){
+w.style.display = "none";
+} else {
+w.style.display = "block";
+setTimeout(function(){
+document.getElementById("searchbox").focus()
+}, 30);
+}
+}
+function div_off(nm){document.getElementById(nm).style.display="none";}
+window.onbeforeunload = function(e){div_off("submenu");}
+/* Disable the Search feature if we are not operating from CGI, since */
+/* Search is accomplished using CGI and will not work without it. */
+if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){
+document.getElementById("search_menubutton").style.display = "none";
+}
+/* Used by the Hide/Show button beside syntax diagrams, to toggle the */
+function hideorshow(btn,obj){
+var x = document.getElementById(obj);
+var b = document.getElementById(btn);
+if( x.style.display!='none' ){
+x.style.display = 'none';
+b.innerHTML='show';
+}else{
+x.style.display = '';
+b.innerHTML='hide';
+}
+return false;
+}
+var antiRobot = 0;
+function antiRobotGo(){
+if( antiRobot!=3 ) return;
+antiRobot = 7;
+var j = document.getElementById("mtimelink");
+if(j && j.hasAttribute("data-href")) j.href=j.getAttribute("data-href");
+}
+function antiRobotDefense(){
+document.body.onmousedown=function(){
+antiRobot |= 2;
+antiRobotGo();
+document.body.onmousedown=null;
+}
+document.body.onmousemove=function(){
+antiRobot |= 2;
+antiRobotGo();
+document.body.onmousemove=null;
+}
+setTimeout(function(){
+antiRobot |= 1;
+antiRobotGo();
+}, 100)
+antiRobotGo();
+}
+antiRobotDefense();
+</script>
+<!-- keywords: sqlite3_mutex_methods -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Mutex Methods Object</h2>
+</div>
+<blockquote><pre>
+typedef struct sqlite3_mutex_methods sqlite3_mutex_methods;
+struct sqlite3_mutex_methods {
+  int (*xMutexInit)(void);
+  int (*xMutexEnd)(void);
+  sqlite3_mutex *(*xMutexAlloc)(int);
+  void (*xMutexFree)(sqlite3_mutex *);
+  void (*xMutexEnter)(sqlite3_mutex *);
+  int (*xMutexTry)(sqlite3_mutex *);
+  void (*xMutexLeave)(sqlite3_mutex *);
+  int (*xMutexHeld)(sqlite3_mutex *);
+  int (*xMutexNotheld)(sqlite3_mutex *);
+};
+</pre></blockquote>
+<p>
+An instance of this structure defines the low-level routines
+used to allocate and use mutexes.</p>
+
+<p>Usually, the default mutex implementations provided by SQLite are
+sufficient, however the application has the option of substituting a custom
+implementation for specialized deployments or systems for which SQLite
+does not provide a suitable implementation. In this case, the application
+creates and populates an instance of this structure to pass
+to sqlite3_config() along with the <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigmutex">SQLITE_CONFIG_MUTEX</a> option.
+Additionally, an instance of this structure can be used as an
+output variable when querying the system for the current mutex
+implementation, using the <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfiggetmutex">SQLITE_CONFIG_GETMUTEX</a> option.</p>
+
+<p>The xMutexInit method defined by this structure is invoked as
+part of system initialization by the sqlite3_initialize() function.
+The xMutexInit routine is called by SQLite exactly once for each
+effective call to <a href="../c3ref/initialize.html">sqlite3_initialize()</a>.</p>
+
+<p>The xMutexEnd method defined by this structure is invoked as
+part of system shutdown by the sqlite3_shutdown() function. The
+implementation of this method is expected to release all outstanding
+resources obtained by the mutex methods implementation, especially
+those obtained by the xMutexInit method.  The xMutexEnd()
+interface is invoked exactly once for each call to <a href="../c3ref/initialize.html">sqlite3_shutdown()</a>.</p>
+
+<p>The remaining seven methods defined by this structure (xMutexAlloc,
+xMutexFree, xMutexEnter, xMutexTry, xMutexLeave, xMutexHeld and
+xMutexNotheld) implement the following interfaces (respectively):</p>
+
+<p><ul>
+<li>  <a href="../c3ref/mutex_alloc.html">sqlite3_mutex_alloc()</a> </li>
+<li>  <a href="../c3ref/mutex_alloc.html">sqlite3_mutex_free()</a> </li>
+<li>  <a href="../c3ref/mutex_alloc.html">sqlite3_mutex_enter()</a> </li>
+<li>  <a href="../c3ref/mutex_alloc.html">sqlite3_mutex_try()</a> </li>
+<li>  <a href="../c3ref/mutex_alloc.html">sqlite3_mutex_leave()</a> </li>
+<li>  <a href="../c3ref/mutex_held.html">sqlite3_mutex_held()</a> </li>
+<li>  <a href="../c3ref/mutex_held.html">sqlite3_mutex_notheld()</a> </li>
+</ul></p>
+
+<p>The only difference is that the public sqlite3_XXX functions enumerated
+above silently ignore any invocations that pass a NULL pointer instead
+of a valid mutex handle. The implementations of the methods defined
+by this structure are not required to handle this case. The results
+of passing a NULL pointer instead of a valid mutex handle are undefined
+(i.e. it is acceptable to provide an implementation that segfaults if
+it is passed a NULL pointer).</p>
+
+<p>The xMutexInit() method must be threadsafe.  It must be harmless to
+invoke xMutexInit() multiple times within the same process and without
+intervening calls to xMutexEnd().  Second and subsequent calls to
+xMutexInit() must be no-ops.</p>
+
+<p>xMutexInit() must not use SQLite memory allocation (<a href="../c3ref/free.html">sqlite3_malloc()</a>
+and its associates).  Similarly, xMutexAlloc() must not use SQLite memory
+allocation for a static mutex.  However xMutexAlloc() may use SQLite
+memory allocation for a fast or recursive mutex.</p>
+
+<p>SQLite will invoke the xMutexEnd() method when <a href="../c3ref/initialize.html">sqlite3_shutdown()</a> is
+called, but only if the prior call to xMutexInit returned SQLITE_OK.
+If xMutexInit fails in any way, it is expected to clean up after itself
+prior to returning.
+</p><p>See also lists of
+  <a href="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+