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href="glib-changes.html#id2971085" title="Incompatible changes from 2.0 to 2.2"><link rel="section" href="glib-changes.html#id2971302" title="Incompatible changes from 1.2 to 2.0"><meta name="generator" content="GTK-Doc V1.2 (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" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"><td><a accesskey="p" href="glib-running.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="glib.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GLib Reference Manual</th><td><a accesskey="n" href="glib-resources.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr></table><div class="refentry" lang="en"><a name="glib-changes"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2><span class="refentrytitle">Changes to GLib</span></h2><p>Changes to GLib — Incompatible changes made between successing versions of GLib </p></div><div class="refsect1" lang="en"><a name="id2971085"></a><h2>Incompatible changes from 2.0 to 2.2</h2><div class="itemizedlist"><ul type="disc"><li><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 <tt class="function">g_rand*_int_range()</tt> 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 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 <tt class="envar">G_RANDOM_VERSION</tt> 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" lang="en"><a name="id2971302"></a><h2>Incompatible changes from 1.2 to 2.0</h2><p> The <a href="http://developer.gnome.org/dotplan/porting/" target="_top">GNOME 2.0 porting guide</a> on <a href="http://developer.gnome.org" target="_top">http://developer.gnome.org</a> has some more detailed discussion of porting from 1.2 to 2.0. See the section on GLib. </p><div class="itemizedlist"><ul type="disc"><li><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 type="circle"><li><p> Sources are now exposed as <span class="type">GSource *</span>, rather than simply as numeric ids. </p></li><li><p> New types of sources are created by structure "derivation" from <span class="structname">GSource</span>, so the <tt class="literal">source_data</tt> parameter to the <span class="structname">GSource</span> virtual functions has been replaced with a <span class="type">GSource *</span>. </p></li><li><p> Sources are first created, then later added to a specific <span class="structname">GMainContext</span>. </p></li><li><p> Dispatching has been modified so both the callback and data are passed in to the <tt class="function">dispatch()</tt> virtual function. </p></li></ul></div><p> To go along with this change, the vtable for <span class="structname">GIOChannel</span> has changed and <tt class="function">add_watch()</tt> has been replaced by <tt class="function">create_watch()</tt>. </p></li><li><p> <tt class="function">g_list_foreach()</tt> and <tt class="function">g_slist_foreach()</tt> 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><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 <tt class="function">g_locale_to_utf8()</tt> first. </p></li><li><p> <tt class="function">g_strsplit()</tt> has been fixed to: </p><div class="itemizedlist"><ul type="circle"><li><p> include trailing empty tokens, rather than stripping them </p></li><li><p> split into a maximum of <tt class="literal">max_tokens</tt> tokens, rather than <tt class="literal">max_tokens + 1</tt> </p></li></ul></div><p> Code depending on either of these bugs will need to be fixed. </p></li><li><p> Deprecated functions that got removed: <tt class="function">g_set_error_handler()</tt>, <tt class="function">g_set_warning_handler()</tt>, <tt class="function">g_set_message_handler()</tt>, use <tt class="function">g_log_set_handler()</tt> instead. </p></li></ul></div></div></div><table class="navigation" width="100%" summary="Navigation footer" cellpadding="2" cellspacing="0"><tr valign="middle"><td align="left"><a accesskey="p" href="glib-running.html"><b><< Running GLib Applications</b></a></td><td align="right"><a accesskey="n" href="glib-resources.html"><b>Mailing lists and bug reports >></b></a></td></tr></table></body></html>