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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Changes to GLib: GLib Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GLib Reference Manual"> <link rel="up" href="glib.html" title="GLib Overview"> <link rel="prev" href="glib-running.html" title="Running GLib Applications"> <link rel="next" href="glib-resources.html" title="Mailing lists and bug reports"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="glib.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="glib-running.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="glib-resources.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="glib-changes"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle">Changes to GLib</span></h2> <p>Changes to GLib — Incompatible changes made between successing versions of GLib </p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="id-1.2.8.3"></a><h2>Incompatible changes from 2.0 to 2.2</h2> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> <p> GLib changed the seeding algorithm for the pseudo-random number generator Mersenne Twister, as used by <span class="structname">GRand</span> and <span class="structname">GRandom</span>. This was necessary, because some seeds would yield very bad pseudo-random streams. Also the pseudo-random integers generated by <code class="function">g_rand*_int_range()</code> will have a slightly better equal distribution with the new version of GLib. </p> <p> Further information can be found at the website of the Mersenne Twister random number generator at <a class="ulink" href="http://www.math.keio.ac.jp/~matumoto/emt.html" target="_top">http://www.math.keio.ac.jp/~matumoto/emt.html</a>. </p> <p> The original seeding and generation algorithms, as found in GLib 2.0.x, can be used instead of the new ones by setting the environment variable <code class="envar">G_RANDOM_VERSION</code> to the value of '2.0'. Use the GLib-2.0 algorithms only if you have sequences of numbers generated with Glib-2.0 that you need to reproduce exactly. </p> </li></ul></div> </div> <div class="refsect1"> <a name="id-1.2.8.4"></a><h2>Incompatible changes from 1.2 to 2.0</h2> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"> <p> The event loop functionality <span class="structname">GMain</span> has extensively been revised to support multiple separate main loops in separate threads. All sources (timeouts, idle functions, etc.) are associated with a <span class="structname">GMainContext</span>. </p> <p> Compatibility functions exist so that most application code dealing with the main loop will continue to work. However, code that creates new custom types of sources will require modification. </p> <p> The main changes here are: </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "> <li class="listitem"><p> Sources are now exposed as <span class="type">GSource *</span>, rather than simply as numeric ids. </p></li> <li class="listitem"><p> New types of sources are created by structure "derivation" from <span class="structname">GSource</span>, so the <code class="literal">source_data</code> parameter to the <span class="structname">GSource</span> virtual functions has been replaced with a <span class="type">GSource *</span>. </p></li> <li class="listitem"><p> Sources are first created, then later added to a specific <span class="structname">GMainContext</span>. </p></li> <li class="listitem"><p> Dispatching has been modified so both the callback and data are passed in to the <code class="function">dispatch()</code> virtual function. </p></li> </ul></div> <p> To go along with this change, the vtable for <span class="structname">GIOChannel</span> has changed and <code class="function">add_watch()</code> has been replaced by <code class="function">create_watch()</code>. </p> </li> <li class="listitem"> <p> <code class="function">g_list_foreach()</code> and <code class="function">g_slist_foreach()</code> have been changed so they are now safe against removal of the current item, not the next item. </p> <p> It's not recommended to mutate the list in the callback to these functions in any case. </p> </li> <li class="listitem"><p> <span class="structname">GDate</span> now works in UTF-8, not in the current locale. If you want to use it with the encoding of the locale, you need to convert strings using <code class="function">g_locale_to_utf8()</code> first. </p></li> <li class="listitem"> <p> <code class="function">g_strsplit()</code> has been fixed to: </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "> <li class="listitem"><p> include trailing empty tokens, rather than stripping them </p></li> <li class="listitem"><p> split into a maximum of <code class="literal">max_tokens</code> tokens, rather than <code class="literal">max_tokens + 1</code> </p></li> </ul></div> <p> Code depending on either of these bugs will need to be fixed. </p> </li> <li class="listitem"><p> Deprecated functions that got removed: <code class="function">g_set_error_handler()</code>, <code class="function">g_set_warning_handler()</code>, <code class="function">g_set_message_handler()</code>, use <code class="function">g_log_set_handler()</code> instead. </p></li> </ul></div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>