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<title>Changes to GLib: GLib Reference Manual</title>
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Changes to GLib
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Changes to GLib —
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Incompatible changes made between successing versions of GLib
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Incompatible changes from 2.0 to 2.2
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GLib changed the seeding algorithm for the pseudo-random number
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generator Mersenne Twister, as used by GRand
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and GRandom. This was necessary, because some
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seeds would yield very bad pseudo-random streams. Also the
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pseudo-random integers generated by
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g_rand*_int_range() will have a
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slightly better equal distribution with the new version of GLib.
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Further information can be found at the website of the Mersenne
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Twister random number generator at http://www.math.keio.ac.jp/~matumoto/emt.html.
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The original seeding and generation algorithms, as found in GLib
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2.0.x, can be used instead of the new ones by setting the environment
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variable G_RANDOM_VERSION to the value of '2.0'. Use
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the GLib-2.0 algorithms only if you have sequences of numbers generated
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with Glib-2.0 that you need to reproduce exactly.
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Incompatible changes from 1.2 to 2.0
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The event loop functionality GMain has extensively
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been revised to support multiple separate main loops in separate threads.
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All sources (timeouts, idle functions, etc.) are associated with a
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GMainContext.
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Compatibility functions exist so that most application code dealing with
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the main loop will continue to work. However, code that creates new custom
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types of sources will require modification.
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The main changes here are:
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Sources are now exposed as GSource *, rather than simply as
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numeric ids.
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New types of sources are created by structure "derivation" from
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GSource, so the source_data
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parameter to the GSource virtual functions has been
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replaced with a GSource *.
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Sources are first created, then later added to a specific
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GMainContext.
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Dispatching has been modified so both the callback and data are passed
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in to the dispatch() virtual function.
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To go along with this change, the vtable for
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GIOChannel has changed and
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add_watch() has been replaced by
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create_watch().
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g_list_foreach() and
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g_slist_foreach() have been changed so they
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are now safe against removal of the current item, not the next item.
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It's not recommended to mutate the list in the callback to these
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functions in any case.
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GDate now works in UTF-8, not in the current locale.
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If you want to use it with the encoding of the locale, you need to convert
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strings using g_locale_to_utf8() first.
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g_strsplit() has been fixed to:
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include trailing empty tokens, rather than stripping them
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split into a maximum of max_tokens tokens, rather
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than max_tokens + 1
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Code depending on either of these bugs will need to be fixed.
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Deprecated functions that got removed:
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g_set_error_handler(),
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g_set_warning_handler(),
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g_set_message_handler(), use
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g_log_set_handler() instead.
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