143 lines
4.6 KiB
HTML
143 lines
4.6 KiB
HTML
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<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>File Locking Levels</title>
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<!-- path=../ -->
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</head>
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<body>
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<div class=nosearch>
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<a href="../index.html">
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<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0">
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</a>
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<div><!-- IE hack to prevent disappearing logo --></div>
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<div class="tagline desktoponly">
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Small. Fast. Reliable.<br>Choose any three.
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</div>
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<div class="menu mainmenu">
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<ul>
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<li><a href="../index.html">Home</a>
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<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a>
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<li class='wideonly'><a href='../about.html'>About</a>
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<li class='desktoponly'><a href="../docs.html">Documentation</a>
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<li class='desktoponly'><a href="../download.html">Download</a>
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<li class='wideonly'><a href='../copyright.html'>License</a>
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<li class='desktoponly'><a href="../support.html">Support</a>
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<li class='desktoponly'><a href="../prosupport.html">Purchase</a>
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<li class='search' id='search_menubutton'>
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<a href="javascript:void(0)" onclick='toggle_search()'>Search</a>
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</ul>
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</div>
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<div class="menu submenu" id="submenu">
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<ul>
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<li><a href='../about.html'>About</a>
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<li><a href='../docs.html'>Documentation</a>
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<li><a href='../download.html'>Download</a>
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<li><a href='../support.html'>Support</a>
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<li><a href='../prosupport.html'>Purchase</a>
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</ul>
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</div>
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<div class="searchmenu" id="searchmenu">
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<form method="GET" action="../search">
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<select name="s" id="searchtype">
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<option value="d">Search Documentation</option>
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<option value="c">Search Changelog</option>
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</select>
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<input type="text" name="q" id="searchbox" value="">
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<input type="submit" value="Go">
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</form>
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</div>
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</div>
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<script>
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function toggle_div(nm) {
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var w = document.getElementById(nm);
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if( w.style.display=="block" ){
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w.style.display = "none";
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}else{
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w.style.display = "block";
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}
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}
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function toggle_search() {
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var w = document.getElementById("searchmenu");
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if( w.style.display=="block" ){
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w.style.display = "none";
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} else {
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w.style.display = "block";
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setTimeout(function(){
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document.getElementById("searchbox").focus()
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}, 30);
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}
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}
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function div_off(nm){document.getElementById(nm).style.display="none";}
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window.onbeforeunload = function(e){div_off("submenu");}
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/* Disable the Search feature if we are not operating from CGI, since */
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/* Search is accomplished using CGI and will not work without it. */
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if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){
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document.getElementById("search_menubutton").style.display = "none";
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}
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/* Used by the Hide/Show button beside syntax diagrams, to toggle the */
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function hideorshow(btn,obj){
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var x = document.getElementById(obj);
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var b = document.getElementById(btn);
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if( x.style.display!='none' ){
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x.style.display = 'none';
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b.innerHTML='show';
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}else{
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x.style.display = '';
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b.innerHTML='hide';
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}
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return false;
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}
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var antiRobot = 0;
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function antiRobotGo(){
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if( antiRobot!=3 ) return;
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antiRobot = 7;
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var j = document.getElementById("mtimelink");
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if(j && j.hasAttribute("data-href")) j.href=j.getAttribute("data-href");
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}
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function antiRobotDefense(){
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document.body.onmousedown=function(){
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antiRobot |= 2;
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antiRobotGo();
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document.body.onmousedown=null;
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}
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document.body.onmousemove=function(){
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antiRobot |= 2;
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antiRobotGo();
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document.body.onmousemove=null;
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}
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setTimeout(function(){
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antiRobot |= 1;
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antiRobotGo();
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}, 100)
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antiRobotGo();
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}
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antiRobotDefense();
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</script>
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<!-- keywords: SQLITE_LOCK_EXCLUSIVE SQLITE_LOCK_NONE SQLITE_LOCK_PENDING SQLITE_LOCK_RESERVED SQLITE_LOCK_SHARED -->
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<div class=nosearch>
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<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
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<h2>File Locking Levels</h2>
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</div>
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<blockquote><pre>
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#define SQLITE_LOCK_NONE 0 /* xUnlock() only */
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#define SQLITE_LOCK_SHARED 1 /* xLock() or xUnlock() */
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#define SQLITE_LOCK_RESERVED 2 /* xLock() only */
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#define SQLITE_LOCK_PENDING 3 /* xLock() only */
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#define SQLITE_LOCK_EXCLUSIVE 4 /* xLock() only */
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</pre></blockquote>
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<p>
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SQLite uses one of these integer values as the second
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argument to calls it makes to the xLock() and xUnlock() methods
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of an <a href="../c3ref/io_methods.html">sqlite3_io_methods</a> object. These values are ordered from
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lest restrictive to most restrictive.</p>
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<p>The argument to xLock() is always SHARED or higher. The argument to
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xUnlock is either SHARED or NONE.
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</p><p>See also lists of
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<a href="../c3ref/objlist.html">Objects</a>,
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<a href="../c3ref/constlist.html">Constants</a>, and
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<a href="../c3ref/funclist.html">Functions</a>.</p>
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